Magnetrol B73-1B20-BKQ Sealed external cage liquid level switch Datasheet

B73 & Series 75
Installation and Operating Manual
Sealed
External
Cage
Liquid
Level
Switches
Read this Manual Before Installing
This manual provides information on the B73 and Series
75 Liquid Level Switches. It is important that all instructions are read carefully and followed in sequence.
Detailed instructions are included in the Installation
section of this manual.
Conventions Used in this Manual
Certain conventions are used in this manual to convey
specific types of information. General technical material,
support data, and safety information are presented in
narrative form. The following styles are used for notes,
cautions, and warnings.
Notes
Notes contain information that augments or clarifies
an operating step. Notes do not normally contain
actions. They follow the procedural steps to which
they refer.
Cautions
Cautions alert the technician to special conditions that
could injure personnel, damage equipment, or reduce
a component’s mechanical integrity. Cautions are also
used to alert the technician to unsafe practices or the
need for special protective equipment or specific
materials. In this manual, a caution indicates a
potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
Warnings
Warnings identify potentially dangerous situations or
serious hazards. In this manual, a warning indicates an
imminently hazardous situation which, if not avoided,
could result in serious injury or death.
WARNING! Explosion hazard. Do not connect or
disconnect equipment unless power has been switched off
or the area is known to be non-hazardous.
Low Voltage Directive
For use in Installation Category II, Pollution Degree 2.
If equipment is used in a manner not specified by
manufacturer, protection provided by equipment may
be impaired.
Notice of Copyright and Limitations
Magnetrol and Magnetrol logotype are registered trademarks
of Magnetrol International.
Copyright © 2010 Magnetrol International, Incorporated.
All rights reserved.
Performance specifications are effective with date of issue and
are subject to change without notice. Magnetrol reserves the
right to make changes to the products described in this
manual at any time without notice. Magnetrol makes no
warranty with respect to the accuracy of the information
in this manual.
Warranty
All Magnetrol mechanical level and flow controls are
warranted free of defects in materials or workmanship for
five full years from the date of original factory shipment.
If returned within the warranty period; and, upon factory
inspection of the control, the cause of the claim is
determined to be covered under the warranty; then,
Magnetrol will repair or replace the control at no cost to
the purchaser (or owner) other than transportation.
Magnetrol shall not be liable for misapplication, labor
claims, direct or consequential damage or expense arising
from the installation or use of equipment. There are no
other warranties expressed or implied, except
special written warranties covering some Magnetrol products.
Quality Assurance
The quality assurance system in place at Magnetrol
guarantees the highest level of quality throughout the
company. Magnetrol is committed to providing full
customer satisfaction both in quality products and
quality service.
Magnetrol’s quality assurance
system is registered to ISO 9001
affirming its commitment to
known international quality
standards providing the strongest assurance of product/service
quality available.
46-620 B73 & Series 75 Liquid Level Switches
B73 & Series 75
Liquid Level Switches
Table of Contents
1.0 Installation
1.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.2 Critical Alarm Function . . . . . . . . . . . . . . . . .4
1.3 Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.5 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2.0 Reference Information
2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Theory of Operation . . . . . . . . . . . . . . . . . . .7
2.3 Operating Cycle . . . . . . . . . . . . . . . . . . . . . . .7
2.4 Switch Differential Adjustment . . . . . . . . . . .8
2.4.1 Low Level Controls . . . . . . . . . . . . . . .8
2.4.2 High Level Controls . . . . . . . . . . . . . .10
2.5 Tandem Float Models . . . . . . . . . . . . . . . . . .10
2.5.1 Installation, Preventive Maintenance,
and Troubleshooting . . . . . . . . . . . . .10
2.5.2 Differential Adjustment . . . . . . . . . . .11
3.0 Troubleshooting
3.1 Check Switch Mechanism . . . . . . . . . . . . . .11
3.2 Check Sensing Unit . . . . . . . . . . . . . . . . . . .12
4.0 Preventive Maintenance
4.1 What To Do . . . . . . . . . . . . . . . . . . . . . . . . .13
4.1.1 Keep Control Clean . . . . . . . . . . . . . .13
4.1.2 Inspect Switch Mechanisms, Terminals,
and Connections Monthly . . . . . . . . .14
4.1.3 Inspect Entire Unit Periodically . . . . .14
4.2 What To Avoid . . . . . . . . . . . . . . . . . . . . . . .14
46-620 B73 & Series 75 Liquid Level Switches
5.0 Specifications
5.1 Agency Approvals . . . . . . . . . . . . . . . . . . . . .15
5.2 Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
6.0 Replacement Parts
6.1 Series 75 . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
6.1.1 Parts Identification . . . . . . . . . . . . . . .20
6.1.2 Switch and Housing Reference . . . . . .20
6.1.3 Series 75 with Material Code 1 . . . . .21
6.1.4 Series 75 with Material Code 2 . . . . .21
6.1.5 Series 75 with Material Code 3 or 4 . .21
6.2 Model B73 . . . . . . . . . . . . . . . . . . . . . . . . . .22
6.2.1 Parts Identification . . . . . . . . . . . . . . .22
6.2.2 Switch and Housing Reference . . . . . .22
6.2.3 Model B73 . . . . . . . . . . . . . . . . . . . . .22
6.3 Series 75 Tandem Float Units . . . . . . . . . . . .23
6.3.1 Parts Identification . . . . . . . . . . . . . . .23
6.3.2 Series 75 Tandem Float Units . . . . . . .23
6.3.3 Switch and Housing Reference . . . . . .23
7.0 Model Numbers
7.1 Model B73 . . . . . . . . . . . . . . . . . . . . . . . . . .24
7.2 Model Series 75 . . . . . . . . . . . . . . . . . . . . . .26
1.0
Installation
Caution: If equipment is used in a manner not specified by manufacturer, protection provided by equipment may be
impaired.
1.1
Unpacking
Unpack the instrument carefully. Inspect all units for
damage. Report any concealed damage to carrier within
24 hours. Check the contents of the packing slip and
purchase order. Check and record the serial number for
future reference when ordering parts.
1.2
Critical Alarm Function
It is recommended that for critical alarm functions, an
additional level switch be installed as a high–high or
low–low level alarm for maximum protection.
1.3
Piping
Figure 3 shows a typical piping installation of a Magnetrol
B73 and Series 75 control to a pressure vessel. Level decals
on control identify the actuation levels for a unit with a
single switch at minimum specific gravity. See Section 5.2,
Physical on page 18 for the actuation levels.
Conduit
outlet
Pressure
vessel
Switch
actuating
level
reference
marks
Shutoff
valve
Use pipe of sufficient strength to support the control. If
necessary, provide a stand or hanger to help support its
weight. All piping should be straight and free of low spots
or pockets so that lower liquid line will drain towards the
vessel and upper vapor line will drain toward the control.
Shut-off valves are recommended for installation between
the vessel and the control. If control is to be used with a
low temperature liquid (one which will boil in the float
chamber if outside heat is absorbed), the chamber and piping should be insulated. Such boiling in the chamber will
cause false level indications.
Caution: Do not insulate switch mechanism housing.
Max. 12"
Drain
valve
Figure 1
Piping Configuration
4
On controls equipped with pneumatic switch assemblies,
consult bulletin on mechanism furnished for air (or gas)
piping instructions. See Section 6.1.2, Switch and Housing
Reference on page 20 for bulletin numbers for pneumatic
switches.
NOTE: D, E, and H75 models are designed for high level service only
and utilize a pressure equalizing self-purging float and stem.
Pressure in the chamber must be raised and lowered slowly to
avoid potential float collapse.
46-620 B73 & Series 75 Liquid Level Switches
1.4
Mounting
Caution: This instrument is intended for use in Installation
Category II, Pollution Degree 2.
Adjust piping as required to bring control to a vertical
position. Magnetrol controls must be mounted within
3° of vertical in all directions. A three degree slant is
noticeable by eye, but installation should be checked with
a spirit level on top and/or sides of float chamber.
Controls should be mounted as close to the vessel as possible. This will result in a more responsive and accurate level
change in the control. Liquid in a long line may be cooler
and more dense than liquid in the vessel causing lower
level indication in the control than actual level in the vessel.
Caution: Never insulate the switch housing of the level control.
Installation and maintenance of tandem float models are
accomplished in much the same manner as described for
standard models. Additional consideration must be given
to the piping arrangement to allow for alignment of the
two switch actuating level marks on the float chamber
with the desired levels in the vessel.
Caution: Operation of all buoyancy type level devices should be
done in such a way as to minimize the action of dynamic
forces on the float or displacer sensing element. Good
practice for reducing the likelihood of damage to the control is to equalize pressure across the device slowly.
1.5
Wiring
Caution: Level controls are shipped from the factory with the
enclosing tube tightened and the middle set screw, on the
housing base, locked to the enclosing tube. Failure to
loosen the set screw prior to repositioning the conduit connection may cause the enclosing tube to loosen, resulting
in the possible leakage of the process liquid or vapor.
B73 and Series 75 controls are shipped with the conduit
entry of the switch housing placed 180° opposite to the
tank configurations to simplify installation in most cases.
If this configuration is appropriate to the installation, proceed to Step 4 to begin wiring the unit. If another configuration is desired, the switch housing can be easily rotated
by first following Steps 1, 2, and 3.
Screw
Screw
Set Screw
Figure 2
Switch Housing
46-620 B73 & Series 75 Liquid Level Switches
NOTE: A switch or circuit breaker shall be installed in close proximity
to equipment and within easy reach of operator. It shall be
marked as the disconnecting equipment.
1. Loosen set screw(s) at base of switch housing. Refer to
Figure 2.
2. Switch housing may be rotated 360° to allow correct
positioning of conduit outlet.
5
3. Tighten set screw(s) at base of switch housing.
4. Unscrew and remove switch housing cover. The threads
have been lubricated to facilitate removal.
NOTE: For supply connections, use wire with a minimum rating of
+167° F (+75° C) as required by process conditions. Use a
minimum of 14 AWG wire for power and ground field wires.
NOTE: Housing must be grounded via protective ground screw in the
base of the housing.
Internal Circuit
(Right) Switch
Internal Circuit
(Left) Switch
4
1
6
3
5
Close on high level
2
NOTE: On high temperature applications (above +250° F [+121° C] in
float chamber), high temperature wire should be used
between control and first junction box located in a cooler area.
On non-hazardous applications, flexible conduit may be used
between the control and the first junction box.
Close on high level
Load
Load
Load
Load
Common
Common
Close on low level
Close on low level
Line
Line
Figure 3
Wiring Diagram for all switches
except Series HS & H1
5. The switch terminals are located next to the conduit
outlet to facilitate wiring. Bring supply wires through
conduit outlet. Route extra wire around enclosing tube
under the baffle plate, and connect them to the proper
terminals. Refer to the wiring diagram, Figure 3, or your
switch bulletin for this information.
NOTE: For models with Series HS or H1 switches with high temperature lead wire, the leads are routed out through the conduit
opening by the factory. A suitable conduit box should be
provided for the connection of the leads to the control wiring.
6. Dress wiring to ensure no interference or contact with
movement of mechanism or replacement of switch
housing cover.
Caution: Observe all applicable electrical codes and proper wiring
procedures.
Caution: In hazardous areas, do not power the unit until the conduit
is sealed and the enclosure cover is screwed down
securely.
7. Replace housing cover.
8. If control has been furnished with an explosion proof or
moisture proof (gasketed) switch housing, it must be
sealed at the conduit outlet with a suitable compound or
non-hardening sealant to prevent entrance of air.
9. Test switch action by varying liquid level in float chamber.
NOTE: If switch mechanism fails to function properly, check vertical
alignment of control housing and consult installation bulletin
for additional wiring information on switch mechanism
furnished. See Section 6.1.2, Switch and Housing
Reference on page 20.
10. Check cover to base fit to be certain gasketed joint is tight.
A positive seal is necessary to prevent infiltration of moisture laden air or corrosive gasses into switch housings.
6
46-620 B73 & Series 75 Liquid Level Switches
2.0
Reference Information
2.1
Description
Magnetrol’s B73 and Series 75 level switches are float operated units suitable for use on clean liquid applications for
level alarm, pump control and safety shutdown functions.
Series 75 units are available with tandem floats for applications where widely spaced high and low switching are
required by a single control.
2.2
Enclosing tube
(non-magnetic)
The design of float operated level switches is based upon
the principle that a magnetic field will not be affected by
non-magnetic materials such as 316 stainless steel. In this
case, the float moves a magnetic attraction sleeve within
a non-magnetic enclosing tube and actuates a magnetic
switch mechanism. The enclosing tube provides a pressure
seal to the chamber and therefore to the process.
Switch
Return spring
Magnet
Attraction
sleeve
Theory of Operation
Swing in
position
HL
2.3
Operating Cycle
As the liquid level rises in the chamber the float moves the
magnetic attraction sleeve up within the enclosing tube
and into the field of the switch mechanism magnet.
Refer to Figure 4. As a result, the magnet is drawn in
tightly to the enclosing tube causing the switch to trip,
making or breaking an electrical circuit. As the liquid level
falls, the float drops and moves the attraction sleeve out of
the magnetic field, releasing the switch at a predetermined
low level. Refer to Figure 5. The tension spring ensures the
return of the switch in a snap action.
Figure 4
Switch Tripped
Swing out
position
LL
Tandem float units incorporate two floats which operate
independently. The lower float actuates the upper switch
mechanism, and the upper float actuates the lower switch
mechanism. The upper float is attached to the lower
attraction sleeve by means of a hollow stem. The lower
float attaches to the upper attraction sleeve with a solid
stem, which extends upward through the upper float and
stem assembly.
Figure 5
Switch Released
46-620 B73 & Series 75 Liquid Level Switches
7
2.4
Switch Differential Adjustment
The standard differential of Series 75 float models with
one switch may be field adjusted. Adjustment may be
necessary if a wider differential needs to be set to overcome
switch chatter caused by the process.
NOTE: This procedure may be applied to single switch models only.
The differential, or the amount of level travel between
switch-on and switch-off, may be adjusted by repositioning
the lower jam nuts on the float stem. This adjustment is
different for high level and low level controls. Refer to the
appropriate section below for adjustment instructions.
NOTE: Maximum differential adjustment is 1 inch.
Caution: Differential adjustments should NOT be made in the field
on tandem float models. Switch actuation levels have
been set at the factory to meet customer specifications.
Variations in actual conditions from design conditions,
usually require special control modifications. Consult the
factory or your local representative for assistance.
2.4.1 Low Level Controls
Slight play (gap)
Must be allowed
(0.03" typical)
Position of bottom
jam nuts (normal
factory setting)
Replace in same position
D
1.00 (25 mm)
Maximum gap setting
(applies to models
having a single
switch mechanism
with a single magnet
actuator only)
Figure 6
Drop bottom
jam nuts to
increase gap
setting (refer
to above
instructions)
Figure 7
On low level controls the switch trips on the lower
actuation point and resets on the higher actuation point.
Widening the differential will allow the switch to trip
on the original actuation point and reset at a later or
higher point.
The differential on low level controls may be adjusted by
repositioning the lower jam nuts on the float stem. The
standard factory setting is for a minimum amount of play
(gap) between the top jam nuts and the attraction sleeve.
Refer to Figure 6.
1. Determine what change in differential is necessary.
NOTE: To widen the differential by one inch, the lower jam nuts must
be set proportionately lower on the stem (i.e., in this example
by 1 inch).
2. Make sure power source is turned off.
3. Unscrew and remove switch housing cover.
4. Disconnect power supply wires from switch mechanism.
Pull wires out of conduit connection opening in housing
base. Refer to Figure 8.
5a. Perform system shut-down procedures as required to
relieve pressure from float chamber of control. Allow unit
to cool.
8
46-620 B73 & Series 75 Liquid Level Switches
5b. Close shut-off valves (if so equipped) to isolate control
from tank. Drain off liquid in float chamber.
5c. On installations without shut-off valves, relieve pressure
from the tank. Drain liquid in tank to a level below the
connections of the float chamber.
NOTE: Level control, connections and pipe lines need not be
removed from the tank.
Switch housing
cover
Enclosing tube
Refer to Figures 6 and 7
Conduit
connection
Housing base
Enclosing tube nut
Chamber
Float
Figure 8
6. Loosen enclosing tube nut with a 15⁄16" wrench. Unscrew
enclosing tube counterclockwise (switch and housing base
will rotate also), until it is free. Refer to Figure 8.
7. Lift enclosing tube, switch, and base off float chamber.
Jam nuts and attraction sleeve are now accessible.
8. Measure the distance “D” from the top edge of the upper
jam nuts to the top of the float stem. Refer to Figure 7.
Record this measurement.
9. Loosen and remove upper jam nuts, guide washer and
attraction sleeve.
10. Loosen and adjust lower jam nuts to the desired position.
Tighten lower jam nuts securely. Refer to Figure 7.
11. Replace attraction sleeve on stem.
12. Replace upper jam nuts and guide washer on the stem in
the position previously noted. Tighten upper jam nuts
securely. Refer to Figure 7.
NOTE: Use a new enclosing tube gasket when reassembling enclosing tube to the chamber. Make certain that all gasket surfaces
are thoroughly cleaned to allow proper gasket seating. Coat
enclosing tube threads with anti-seizing compound.
13. Replace enclosing tube, switch, and base on chamber. Screw
tube clockwise until tightened to 75–100 foot-pounds of
torque for a fiber gasket or 200–225 foot-pounds
of torque for a spiral wound gasket.
14. Loosen the set screws at the base of the switch housing.
Rotate switch housing to correct position and tighten set
screws. Refer to Figure 2 on page 5.
15. Bring supply wires through conduit outlet. Follow steps
5 through 10 in Section 1.5, Wiring on page 5.
16. Test switch action by varying liquid level in float chamber.
NOTE: If switch mechanism fails to function properly, check vertical
alignment of control housing and consult installation bulletin
on switch mechanism. If the unit still fails to function properly,
consult the factory.
46-620 B73 & Series 75 Liquid Level Switches
9
2.4.2 High Level Controls
On high level controls, the switch trips on the higher actuation point and resets on the lower actuation point.
Caution: On high level controls, widening the differential requires
raising the trip point a proportional amount. The reset
point will remain the same.
To widen the differential by raising the trip point, follow
steps 1 through 16 in Section 2.4.1, Low Level Controls
on pages 8–9.
2.5
Tandem Float Models
Models with tandem floats are used on applications where
it is advantageous to have two widely spaced high and low
switching functions using a single control.
The units incorporate two floats which operate independently, and are arranged so that the lower float actuates the
upper switch mechanism, and the upper float actuates the
lower switch mechanism. The upper float is attached to
the lower attraction sleeve by means of a hollow stem. The
lower float attaches to the upper attraction sleeve with a
solid stem that extends upward through the upper float
and stem assembly.
2.5.1 Installation, Preventive Maintenance, and
Troubleshooting
Installation and maintenance of tandem float models is
accomplished in much the same manner as for standard
models previously described. Some additional consideration must be given to the piping arrangement to allow for
alignment of the two switch actuating level marks on the
float chamber with the desired levels in the vessel. When
troubleshooting the level sensing portion of the control,
additional checks may be made of the following:
1. Inspect for binding of solid (lower) float stem within hollow (upper) float stem due to corrosion or possible damage
incurred during shipment or previous maintenance.
2. Make certain that retaining (snap) rings, used to locate
lower attraction sleeve, are locked in place. An extreme
shock or hammer, such as during blow-down on a water
column boiler control, may damage a ring causing it to
snap out of its retaining groove in the hollow (upper)
float stem.
10
46-620 B73 & Series 75 Liquid Level Switches
2.5.2 Differential Adjustment
Caution: No differential adjustment should be made on tandem
float models in the field. Switch actuation levels have been
set at the factory to meet customer specifications.
Variations in actual conditions, from design conditions,
usually require special control modifications.
3.0
Troubleshooting
Usually the first indication of improper operation is failure
of the controlled equipment to function, i.e., pump will
not start (or stop), signal lamps fail to light, etc. When
these symptoms occur, whether at time of installation or
during routine service thereafter, check the following
potential external causes first:
a. Fuses may be blown
b. Reset button(s) may need resetting
c. Power switch may be open
d. Controlled equipment may be faulty
e. Wiring leading to control may be defective
If a thorough inspection of these possible conditions fails
to locate the trouble, proceed next to a check of the
control's switch mechanism.
3.1
Check Switch Mechanism
1. Pull disconnect switch or otherwise disconnect power to
the control.
2. Remove switch housing cover.
3. Disconnect power wiring from switch assembly.
4. Swing magnet assembly in and out by hand to check carefully for any sign of binding. Assembly should require
minimal force to move it through its full swing.
5. If binding exists, magnet may be rubbing enclosing tube.
If magnet is rubbing, loosen magnet clamp screw and shift
magnet position. Retighten magnet clamp screw.
6. If switch magnet assembly swings freely and mechanism
still fails to actuate, check installation of control to be
certain it is within the specified 3° of vertical.
7. Check the continuity of microswitch with ohmmeter.
Replace immediately if defective.
8. If switch mechanism is operating satisfactorily, proceed to
check sensing unit.
NOTE: As a matter of good practice, spare switches should be kept
on hand at all times.
46-620 B73 & Series 75 Liquid Level Switches
11
3.2
Check Sensing Unit
1. Reconnect power supply. Being careful to avoid electrical
shock, manually actuate switch mechanism (use a nonconductive tool on electrical switch mechanisms) to determine whether controlled equipment will operate.
Caution: With electrical power on, care should be taken to avoid
contact with switch leads and connections at terminal
block.
2. If controlled equipment responds to manual actuation test,
trouble may be located in the level sensing portion of the
control, float(s), stem(s), and magnetic attraction sleeve(s).
3. Check to be certain liquid is entering float chamber. A
valve may be closed or piping plugged.
Caution: Be certain to pull disconnect switch or otherwise ensure
that electrical circuit(s) through control is deactivated.
Close operating medium supply valve on controls
equipped with pneumatic switch mechanisms.
4. With liquid in chamber, proceed to check level sensing
action by removing switch housing assembly and
enclosing tube.
5. Disconnect wiring from supply side of switch mechanism(s) and remove electrical conduit or operating medium line connections to switch housing.
6. Perform system shutdown to relieve pressure from float
chamber of control and allow unit to cool.
7. Close shutoff valves (if equipped) to isolate control from
vessel. Drain off liquid in chamber if necessary
8. On installations without shutoff valves, relieve pressure
from vessel and drain off liquid head above control
mounting level.
NOTE: Control chamber, connections, and pipe lines need not be
removed from vessel or boiler.
9. Remove switch housing assembly by loosening hex nut,
which is located immediately below housing base.
10. With switch housing assembly removed, inspect attraction
sleeve(s) and inside of enclosing tube for excessive corrosion or solids buildup which could restrict movement, preventing sleeve(s) from reaching field of switch magnet(s).
11. If differential has been changed in the field by repositioning the lower jam nuts on the float stem, check tightness
and position of the jam nuts. Refer to Figure 7 on page 8.
12
46-620 B73 & Series 75 Liquid Level Switches
NOTE: Differential adjustment affects a change in the amount of level
travel between switch-on and switch-off actuations. Do not
attempt adjustment without first consulting factory for assistance in computing level differential change for your control.
12. Check float to be certain it is buoyant in the liquid (float
chamber or vessel must have adequate liquid level). If float
is determined to be filled with liquid, or it is collapsed, it
must be replaced immediately. Do not attempt to repair a
float. See Section 2.5, Tandem Float Models on page 10.
If all components in the control are in operating condition,
the trouble must be located external to the control. Repeat
inspection of external conditions previously described.
NOTE: If difficulties are encountered which cannot be identified,
consult the factory or your local representative for assistance.
A complete description of the trouble should be provided
along with information concerning your piping and mounting
arrangement, plus a description of your operating sequence.
Sketches or photographs showing the installation are also
beneficial.
When communicating about your control, be certain to
always specify the complete Model and Serial numbers.
4.0
Preventive Maintenance
Periodic inspections are a necessary means to keep your
Magnetrol level control in good working order. This control is a safety device to protect the valuable equipment it
serves. A systematic program of preventive maintenance
must be implemented when the control is placed into
service. If the following is observed, your control will
provide reliable protection of your capital equipment for
many years.
4.1
What To Do
4.1.1 Keep Control Clean
Be sure the switch housing cover is always in place on the
control. This cover is designed to keep dust and dirt from
interfering with switch mechanism operation. In addition,
it protects against damaging moisture and acts as a safety
feature by keeping bare wires and terminals from being
exposed. Should the housing cover or any seals become
damaged or misplaced, obtain a replacement immediately.
46-620 B73 & Series 75 Liquid Level Switches
13
4.1.2 Inspect Switch Mechanisms, Terminals, and
Connections Monthly
1. Switches should be inspected for excessive wear on actuating lever or misalignment of adjustment screw at point of
contact between screw and lever. Such wear can cause false
switch actuating levels. See Section 6.1.2, Switch and
Housing Reference on page 20 for bulletin supplied
with control should switch adjustment or replacement
be necessary.
2. DO NOT operate your control with defective or
mal-adjusted switch mechanisms. See Section 6.1.2,
Switch and Housing Reference on page 20 for bulletin on
switch mechanisms furnished for service instructions.
3. Level controls may sometimes be exposed to excessive heat
or moisture. Under such conditions, insulation on electrical
wiring may become brittle, eventually breaking or pealing
away. The resulting exposed wires can cause short circuits.
NOTE: Check wiring carefully and replace at the first sign of brittle
insulation.
4. Vibration may sometimes cause terminal screws to work
loose. Check all terminal connections to be certain that
screws are tight.
5. On units with pneumatic switches, air (or gas) lines
subjected to vibration, may eventually crack or become
loose at connections causing leakage. Check lines and
connections carefully and repair or replace if necessary.
NOTE: As a matter of good practice, spare switches should be kept
on hand at all times.
4.1.3 Inspect Entire Unit Periodically
Isolate control from vessel. Raise and lower liquid level to
check for switch contact and reset.
4.2
What To Avoid
Caution: Operation of all buoyancy type level devices should be
done in such a way as to minimize the action of dynamic
forces on the float or displacer sensing element. Good
practice for reducing the likelihood of damage to the control
is to equalize pressure across the device very slowly.
1. Never leave switch housing cover off the control longer
than necessary to make routine inspections.
2. Never place a jumper wire across terminals to “cut-out”
the control. If a “jumper” is necessary for test purposes, be
certain it is removed before placing control into service.
14
46-620 B73 & Series 75 Liquid Level Switches
3. Never attempt to make adjustments or replace switches
without reading instructions carefully. Certain adjustments
provided for in level controls should not be attempted in
the field. When in doubt, consult the factory or your local
representative.
4. Never use lubricants on pivots of switch mechanisms.
A sufficient amount of lubricant has been applied at the
factory to ensure a lifetime of service. Further oiling is
unnecessary and will only tend to attract dust and dirt
which can interfere with mechanism operation.
5.0
Specifications
5.1
Agency Approvals
Agency
Approved Model
Area Classification
FM
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9
Class I, Div 1, Groups C & D
Class II, Div 1, Groups E, F & G
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9 Class I, Div 1, Group B
Class I, Div 1, Groups B, C & D
Class II, Div 1, Groups E, F & G
All with a Series F, HS, or H1 electric switch
mechanism and a housing listed as CSA TYPE 4X
Class I, Div 2, Groups B, C & D
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9
Class I, Div 1, Groups C & D
Class II, Div 1, Groups E, F & G
All with an electric switch mechanism and a housing
listed as TYPE 4X/7/9 Class I, Div 1, Group B
Class I, Div 1, Groups B, C & D
Class II, Div 1, Groups E, F & G
All with an electric switch mechanism and an
ATEX housing ATEX II 2 G EEx D IIC T6
94/9/EC
IEC ExEx d IIC T6
IP66
Low voltage directives
2006/95/EC
Installation Category II
Pollution Degree 2
CSA
ATEX / IEC Ex CE
Per Harmonized Standard
EN 61010-1/1993 & Amendment No. 1
Models with two HS or two H1 switches are not ATEX approved.
Maximum Process
Temperature
Temperature
Classification
< 85° C
T6
< 100° C
T5
< 135° C
T4
Heat extensions (between process connection and housing) shall
never be insulated.
< 200° C
T3
< 300° C
T2
Special conditions for safe use:
< 450° C
T1
IEC Installation Instructions:
The cable entry and closing devices shall be Ex d certified suitable
for the conditions of use and correctly installed.
For ambient temperatures above +55° C or for process temperatures
above +150° C, suitable heat resistant cables shall be used.
When the equipment is installed in process temperatures higher than
+85° C the temperature classification must be reduced according to
the following table as per IEC60079-0.
46-620 B73 & Series 75 Liquid Level Switches
These units are in conformity with IECEx KEM 05.0020X
Classification Ex d IIC T6
Tambient -40° C to +70° C
15
5.2
Physical
STAINLESS STEEL CHAMBERS WITH 1-INCH CONNECTIONS
INCHES
Min.
SG
NPT & Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
MILLIMETERS
Actuating
Levels NPT &
Socket Weld
HL
A
LL
Flanged
Upper Side/Btm
Flanged
Side/Side
B
C
A
B
C
C
HL
B73 0.59 6.36 3.34 17.44 9.25 6.25 20.32 9.90 6.25 21.00 1.22 2.10 151
84
442
235
159
515
251 159
532
30
53
C75 0.60 8.50 3.61 22.06 11.56 6.68 25.12 12.21 6.68 25.75 2.75 3.62 216
92
560
294
170
638
310 170
654
70
92
J75
0.57 9.25 3.61 23.06 12.31 6.68 26.12 12.96 6.68 26.75 2.93 3.78 235
92
586
313
170
663
329 170
679
74
96
216
69
555
294
144
633
310 144
651
62
89
66
548
294
141
625
310 141
646
62
89
78
557
294
155
635
310 155
652
65
89
O75 0.85 8.50 2.71 21.87 11.56 5.68 24.93 12.21 5.68 25.62 2.44 3.50
O75 0.85 8.50 2.59 21.56 11.56 5.56 24.62 12.21 5.56 25.43 2.44 3.50 216
P75
0.75 8.50 3.09 21.93 11.56 6.12 25.00 12.21 6.12 25.68 2.56 3.50 216
A
B
Actuating
Levels LL
Levels ± 0.25" (6 mm)
STAINLESS STEEL CHAMBERS WITH 11⁄2-INCH CONNECTIONS
INCHES
Min.
SG
NPT & Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
MILLIMETERS
Actuating
Levels NPT &
Socket Weld
HL
A
LL
Flanged
Upper Side/Btm
Flanged
Side/Side
A
B
Actuating
Levels B
C
A
B
C
C
HL
LL
C75 0.60 8.50 4.22 12.56 12.56 7.68 16.63 13.21 7.68 17.31 2.13 3.00 215
107
319
319
195
422
335 195
439
54
76
J75 0.57 9.25 4.22 13.56 13.31 7.68 17.63 13.96 7.68 18.25 2.75 3.50 234
107
344
338
195
448
354 195
464
70
89
Levels ± 0.25" (6 mm)
STAINLESS STEEL CHAMBERS WITH 2-INCH CONNECTIONS
INCHES
Min.
SG
NPT & Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
MILLIMETERS
Actuating
Levels NPT &
Socket Weld
HL
A
LL
Flanged
Upper Side/Btm
Flanged
Side/Side
B
C
A
B
C
C75 0.60 8.25 4.37 12.69 12.56 7.68 17.00 13.21 7.68 17.69 1.75 2.63 209
110
322
319
195
431
335 195
A
B
J75 0.57 9.00 4.34 13.69 13.31 7.68 18.00 13.96 7.68 18.69 2.98 3.13 228
110
348
338
195
457
354 195
Actuating
Levels C
HL
LL
449
44
69
475
60
80
Levels ± 0.25" (6 mm)
Minimum SG given is for single switch units with -1 materials of construction. Consult factory for other configurations.
Switch actuating levels (HL & LL) are given for minimum specific gravity materials of construction –1 and single switch
units. Consult factory for other configurations.
304 Stainless steel only
316 Stainless steel only
Standard process connections are a combination of 1" NPT
and 1" socket weld coupling.
These dimensions increase by 2.19 (55) with Series HS
switches with terminal blocks.
Allow overhead clearance of 10.00 (254) for cover removal.
All housings rotatable 360°.
16
46-620 B73 & Series 75 Liquid Level Switches
Inches (mm)
D
D
E
E
D
E
F
F
F
C
C
HL
HL
LL
LL
C
A
A
HL
LL
A
B
B
B
Series 75
Flanged Upper Side/Bottom
Series 75
Threaded and Socket Weld Upper Side/Bottom
Series 75
Flanged Side/Side
D
E
D
6.25 (158)
E
D
F
6.25 (158)
E
F
F
6.25 (158)
plugged
F
F
F
plugged
C
HL
plugged
C
HL
C
HL
LL
LL
A
A
LL
A
B
Model B73
Threaded and Socket Weld Upper Side/Bottom
B
B
Model B73
Upper Side/Bottom Flanged
Housing
46-620 B73 & Series 75 Liquid Level Switches
Model B73
Side/Side Flanged
D
E
NEMA 1
4.70 5.00
(119) (127)
TYPE 4X/7/9
Group B
5.93
(151)
3.87
(98)
Conduit Connections F
Electrical Switches
TYPE 4X/7/9: 1" NPT
Group B:
1" NPT
Pneumatic Switches
1
NEMA 1:
⁄4" NPT
17
5.2
Physical
CARBON STEEL CHAMBERS WITH 1-INCH CONNECTIONS
INCHES
Min.
SG
NPT & Socket Weld
A
B73 0.59
B75 0.67
B
C
6.36 3.34 17.44
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
MILLIMETERS
Actuating
Levels C
HL
LL
NPT &
Socket Weld
A
9.25 6.25 20.32 9.90 6.25 21.00 1.22 2.10 151
A
B
C
515
A
B
C
251 159 532
649
310 170 666
F75 0.55 10.91 5.33 24.91 13.78 8.19 27.78 14.39 8.19 28.39 1.76 2.35 277 135 633 350 208
706
366 208 721
G75 0.53
2.25 2.92
Actuating
Levels HL
LL
30
53
65
82
69
87
44
59
57
74
73
91
240 110 595 313 183
668
329 183 685
K75 0.39 11.69 5.33 25.69 14.56 8.19 28.56 15.21 8.19 29.21 2.15 2.77 297 135 653 370 208
754
386 208 742
54
70
L75 0.40
9.44 4.33 23.44 12.31 7.19 26.31 12.96 7.19 26.96 2.45 3.19 240 110 595 313 183
668
329 183 685
62
81
N75 0.32 11.69 5.33 25.69 14.56 8.19 28.56 15.21 8.19 29.21 2.17 2.86 297 135 653 370 208
754
386 208 742
55
72
54
70
J75
0.48
9.44 4.33 23.44 12.31 7.19 26.31 12.96 7.19 26.96
2.72 3.44
221
C
84 442 235 159
Flanged
Side/Side
97 576 294 170
C75 0.55
8.69 3.80 22.69 11.56 6.69 25.56 12.21 6.69 26.21
2.56 3.24
B
Flanged
Upper Side/Btm
S75 0.60 11.16 5.33 27.06
Consult Factory
2.90 3.62
2.13 2.78 283 135 687
Consult Factory
V75 0.74
9.02 4.15 23.27 11.56 6.68 25.81 12.21 6.68 26.46 2.63 3.38 229 105 591 294 170
656
313 170 672
69
86
Z75 0.68
9.77 4.68 24.16 12.31 7.18 26.70 12.96 7.18 27.35 2.38 3.19 248 119 614 313 182
678
329 182 695
60
81
Levels ± 0.25" (6 mm)
CARBON STEEL CHAMBERS WITH 11⁄2-INCH CONNECTIONS
INCHES
Min.
SG
B75 0.67
NPT & Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
1.93 2.61
NPT &
Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
227 107
586
319
195 678 336
195
694
F75 0.55 11.06 5.75 26.19 14.78 9.19 29.92 15.39 9.19 30.53 1.08 1.66 281 146
665
375
233 760 391
233
775
C75 0.55
G75 0.53
8.94 4.22 23.06 12.56 7.69 26.69 13.21 7.69 27.34
MILLIMETERS
Actuating
Levels
HL LL
1.59 2.25
49
66
49
66
27
42
40
57
56
74
244 121
612
338
208 705 355
208
722
K75 0.39 12.06 5.75 27.14 15.56 9.19 30.64 16.21 9.19 31.29 1.77 2.39 306 146
689
395
233 778 412
233
795
44
60
L75 0.40
9.62 4.75 24.09 13.31 8.19 27.75 13.96 8.19 28.42 1.78 2.52 244 121
612
338
208 705 355
208
722
44
64
N75 0.32 12.06 5.75 27.14 15.56 9.19 30.64 16.21 9.19 31.29 1.81 2.49 306 146
689
395
233 778 412
233
306
J75
0.48
9.62 4.75 24.09 13.31 8.19 27.75 13.96 8.19 28.42
1.93 2.61
Actuating
Levels HL LL
S75 0.60
Consult Factory
2.23 2.95
n/a
n/a
Consult Factory
45
63
n/a
n/a
V75 0.74
8.82 4.22 23.20 12.56 7.68 26.94 13.21 7.68 27.79 1.94 2.69 224 107
589
319
195 684 336
195
706
49
68
Z75 0.68
9.51 4.75 24.09 13.31 8.18 27.89 13.96 8.18 28.54 1.69 2.59 242 121
612
338
208 708 355
208
725
43
66
Levels ± 0.25" (6 mm)
CARBON STEEL CHAMBERS WITH 2-INCH CONNECTIONS
INCHES
Min.
SG
B75 0.67
NPT & Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
1.48 2.16
NPT &
Socket Weld
A
B
C
Flanged
Upper Side/Btm
A
B
C
Flanged
Side/Side
A
B
C
221 110
589
319
195 662 336
195
704
F75 0.55 10.94 5.88 26.32 14.78 9.19 30.16 15.39 9.19 30.77 0.78 1.36 278 149
669
375
233 766 391
233
782
C75 0.55
G75 0.53
8.69 4.34 23.20 12.56 7.69 26.07 13.21 7.69 27.72
MILLIMETERS
Actuating
Levels
HL LL
1.31 1.97
37
54
41
59
19
34
33
50
49
67
241 124
615
338
208 712 355
208
728
K75 0.39 11.94 5.88 27.32 15.56 9.19 30.94 16.21 9.19 31.59 1.59 2.21 303 149
694
395
233 786 412
233
802
40
56
L75 0.40
9.50 4.88 24.21 13.31 8.19 28.02 13.96 8.19 28.67 1.50 2.24 241 124
615
338
208 712 355
208
728
38
56
N75 0.32 11.94 5.88 27.32 15.56 9.19 30.94 16.21 9.19 31.59 1.63 2.31 303 149
694
395
233 786 412
233
802
40
58
J75
0.48
S75 0.60
9.50 4.88 24.21 13.31 8.19 28.02 13.96 8.19 28.67
1.64 2.36
Actuating
Levels HL LL
Consult Factory
1.95 2.67
n/a
n/a
V75 0.74
8.49 4.34 23.27 12.56 7.68 27.34 13.21 7.68 27.99 1.88 2.63 216 110
n/a
n/a
591
Consult Factory
319
195 694 336
195
711
48
67
Z75 0.68
9.31 4.87 24.16 13.31 8.18 28.16 13.96 8.18 28.81 1.44 2.25 236 124
614
338
208 715 355
208
732
37
57
Levels ± 0.25" (6 mm)
Minimum SG given is for single switch units with -1 materials of construction. Consult factory for other configurations.
Switch actuating levels (HL & LL) are given for minimum specific gravity materials of construction –1 and single switch units.
Consult factory for other configurations.
Standard process connections are a combination of 1" NPT and 1" socket weld coupling.
18
46-620 B73 & Series 75 Liquid Level Switches
Inches (mm)
D
D
E
E
D
E
F
F
F
C
HL
C
HL
LL
LL
C
A
A
HL
LL
A
B
B
B
Series 75
Flanged Upper Side/Bottom
Series 75
Threaded and Socket Weld Upper Side/Bottom
Series 75
Flanged Side/Side
D
E
D
6.25 (158)
E
D
F
6.25 (158)
E
F
6.25 (158)
F
F plugged
HL
plugged
plugged
F
C
F
C
HL
C
HL
LL
LL
A
A
LL
A
B
Model B73
Threaded and Socket Weld Upper Side/Bottom
B
Model B73
Upper Side/Bottom Flanged
These dimensions increase by 2.19 (55) with Series HS
switches with terminal blocks.
Allow overhead clearance of 10.00 (254) for cover removal.
All housings rotatable 360°.
46-620 B73 & Series 75 Liquid Level Switches
B
Housing
Model B73
Side/Side Flanged
D
E
NEMA 1
4.70 5.00
(119) (127)
TYPE 4X/7/9
Group B
5.93
(151)
3.87
(98)
Conduit Connections F
Electrical Switches
TYPE 4X/7/9: 1" NPT
Group B:
1" NPT
Pneumatic Switches
1
NEMA 1:
⁄4" NPT
19
6.0
Replacement Parts
6.1 Series 75
6.1.1 Parts Identification
1
Item
1
2
3
4
5
6
7
8
9
10
4 5
3
2
9
8
6
10
Description
Housing cover
Housing base
Switch mechanism
Jam nuts
Lock washer
Attraction sleeve
Stop tube (not shown)
Enclosing tube
E-tube gasket
Chamber assembly
IMPORTANT:
When ordering, please specify:
A. Model and serial numbers or control.
B. Name and/or number of replacement assembly.
Many Model 75 controls are specially tailored to meet customer specifications
and, therefore, may contain special parts. When ordering, always provide serial
number of control.
6.1.2 Switch and Housing Reference
Dry contact
Hermetically sealed
Bleed type pneumatic
Non-bleed type pneumatic
High temperature dry contact
20
Series Type
B, C, D
HS, H1
J
K
F, R, 8, 9
Bulletin #
42-683
42-694
42-685
42-486
42-799
46-620 B73 & Series 75 Liquid Level Switches
6.1.3 Series 75 with Material Code 1
All Models except S75, V75 & Z75
Housing cover
Housing base
Switch mechanism
Attraction sleeve kit:
includes items 4, 5, 6 & 7
Enclosing tube - models w/electric switches*
Enclosing tube - models w/J or K switches
E-tube gasket - Models B, E, F, G, H, K
E-tube gasket - Models C, J, L, M, N
Chamber assembly
S75, V75 & Z75 Only
See Section 6.1.2, Switch and Housing Reference
on previous page for switch and housing bulletin furnished.
089-3409-009
089-3409-002
Z32-6325-004
Z32-6325-006
Z32-6325-001
Z32-6325-003
012-1204-001
012-1204-001
012-1301-002
012-1204-001
Available as complete sensing units only with all parts listed
under items 4 through 10 assembled. When ordering, specify
specify model and serial number of control.
*Consult factory for Series G, H & I switches
6.1.4 Series 75 with Material Code 2
All Models except S75, V75 & Z75
Housing cover
Housing base
Switch mechanism
Attraction sleeve kit:
includes items 4, 5, 6 & 7
Enclosing tube - models w/electric switches*
Enclosing tube - models w/J or K switches
E-tube gasket - Models B, E, F, G, H, K
E-tube gasket - Models C, J, L, M, N
Chamber assembly
S75, V75 & Z75 Only
See Section 6.1.2, Switch and Housing Reference
on previous page for switch and housing bulletin furnished.
089-3410-012
089-3410-002
Z32-6325-005
Z32-6325-006
Z32-6325-002
Z32-6325-003
012-1204-001
012-1204-001
012-1301-002
012-1204-001
Available as complete sensing units only with all parts listed
under items 4 through 10 assembled. When ordering, specify
model and serial number of control.
*Consult factory for Series G, H & I switches
6.1.5 Series 75 with Material Code 3 or 4
All Models w/Material Code 3
Housing cover
Housing base
Switch mechanism
Attraction sleeve kit:
includes items 4, 5, 6 & 7
Enclosing tube - models w/electric switches
Enclosing tube - models w/J or K switches
Enclosing tube gasket
Chamber assembly
46-620 B73 & Series 75 Liquid Level Switches
All Models w/Material Code 4
See Section 6.1.2, Switch and Housing Reference
on previous page for switch and housing bulletin furnished.
089-3410-010
089-3410-001
Z32-6325-005
Z32-6325-005
Z32-6325-002
Z32-6325-002
012-1301-002
012-1301-002
Available as complete sensing units only with all parts listed
under items 4 through 10 assembled. When ordering, specify
specify model and serial number of control.
21
6.2
Model B73
1
4 5
3
2
7
6
8
9
6.2.1 Parts Identification
Item
1
2
3
4
5
6
7
8
9
Description
Housing cover
Housing base
Switch mechanism
Jam nuts
Lock washer
Attraction sleeve
Enclosing tube
E-tube gasket
Chamber assembly
IMPORTANT:
When ordering, please specify:
A. Model and serial numbers or control.
B. Name and/or number of replacement assembly.
Many Model 75 controls are specially tailored to meet customer specifications
and, therefore, may contain special parts. When ordering, always provide serial
number of control.
6.2.2 Switch and Housing Reference
Dry contact
Hermetically sealed
Hermetically sealed
Bleed type pneumatic
Non-bleed type pneumatic
Series Type
B, C, D
F
HS, H1
J
K
Bulletin #
42-683
42-799
42-694
42-685
42-486
6.2.3 Model B73
Model B73-1
Housing cover
Housing base
Switch mechanism
Attraction sleeve kit
includes items 4, 5, & 6
Enclosing tube
E-tube gasket
Chamber assembly
22
Model B73-2 or B73-4
Model B73-3
See Section 6.2.2, Switch and Housing Reference
above for switch and housing bulletin furnished.
089-3409-012
089-3410-009
089-3410-011
Z32-6325-001
Z32-6325-002
Z32-6325-002
012-1301-002
012-1301-002
012-1301-002
Available as complete sensing units only with all parts listed
under items 4 through 10 assembled. When ordering, specify
specify model and serial number of control.
46-620 B73 & Series 75 Liquid Level Switches
6.3
Series 75 Tandem Float Units
1
3
10
4
6.3.1 Parts Identification
8
2
Item
1
2
3
4
5
6
7
8
9
10
11
5
9
6
11
Description
Housing cover
Housing base
Switch mechanism
Jam nuts
Upper attraction sleeve
Lower attraction sleeve
Spacer washer (not shown)
Retaining ring
E-tube gasket
Enclosing tube
Chamber assembly
6.3.2 Series 75 Tandem Float Units
Models B, C, G, J, L, & M
Housing cover
Housing base
Switch mechanism
Attraction sleeve kit:
includes items 4, 5, 6, 7 & 8
E-tube gasket
Enclosing tube
Chamber assembly
Models F, K, & N
See Section 6.3.3, Switch and Housing Reference
below for switch and housing bulletin furnished.
089-3411-001 (Mat’l Code 1)
089-3413-001 (Mat’l Code 1)
089-3412-001 (Mat’l Code 2, 3, & 4) 089-3414-001 (Mat’l Code 2, 3, & 4)
012-1204-001
012-1204-001
Z32-6325-004 (Mat’l Code 1) /
Z32-6325-004 (Mat’l Code 1) /
Z32-6325-005 (Mat’l Code 2) /
Z32-6325-005 (Mat’l Code 2) /
Available as complete sensing units only with all parts listed under
items 4 through 10 assembled. When ordering, specify model and serial
number of control.
6.3.3 Switch and Housing Reference
Dry contact
Hermetically sealed
Bleed type pneumatic
Non-bleed type pneumatic
High temperature dry contact
46-620 B73 & Series 75 Liquid Level Switches
Series Type
B, C, D
HS, H1
J
K
F, R, 8, 9
Bulletin#
42-683
42-694
42-685
42-486
42-799
23
7.0
Model Numbers
7.1
Model B73
MODEL NUMBER CODE
Pressure Rating
psig @ ° F
bar @ ° C
100
450 38
232 Model Min.
No.
SG Materials of Construction
B73-1 0.59
Carbon steel chamber, 316 stainless steel float,
400 stainless steel trim
B73-2 0.59
Carbon steel chamber, 316 stainless steel float,
316 stainless steel trim
304 stainless steel chamber, 316 stainless steel float,
304 stainless steel trim
B73-3 0.59
B73-4 0.59
400
275
28
20
316 stainless steel chamber, 316 stainless steel float,
316 stainless steel trim
TANK CONNECTION TYPE AND SIZE
B20
1" NPT threaded side/bottom
B30
N30
1" socket weld side/bottom
1" 150 lb. flanged upper side/bottom
N40
1" 300 lb. flanged upper side/bottom
S30
1" 150 lb. flanged side/side
S40
1" 300 lb. flanged side/side
Models are limited to maximum temperature rating of selected
switch mechanism. See Switch Mechanism chart on page 27.
Consult factory for TYPE 4X/7/9 cast iron housings.
Process temperature based on +100° F (+38° C) ambient.
Drain or uncontrolled housing heater available in TYPE 4X/7/9
enclosures. Consult factory for standard part number.
On steam & other condensing applications, temperature downrated to +400° F (+204° C) process @ +100° F (+38° C) ambient.
24
46-620 B73 & Series 75 Liquid Level Switches
ELECTRIC SWITCH MECHANISM AND ENCLOSURE Model B73-1 Only
Models B73-2, B73-3, B74-4
TYPE 4X/7/9 Aluminum Enclosure Class I, Div 1 Class I, Div 1
Process
Groups
Groups
Temperature One Set Point
C&D
B, C & D
Range °F (°C)
Contacts
Switch Description
-40 to +250
(-40 to +121)
Series B Snap
-40 to +450
(-40 to +232)
Series C Snap
-40 to +250
(-40 to +121)
Series D Snap
Series F
Hermetically Sealed Snap
Series HS
Hermetically Sealed 5 amp
Snap with wiring leads
Series HS
Hermetically Sealed 5 amp
Snap with terminal block
SPDT
DPDT
SPDT
DPDT
ATEX
Class I, Div 1 Class I, Div 1
Groups
Groups
C&D
B, C & D
ATEX
BKP
BNP
BKT
BNT
BAC
BBC
BKQ
BNQ
BKS
BNS
BA9
BB9
CKP
CNP
CKT
CNT
CAC
CBC
CKQ
CNQ
CKS
CNS
CA9
CB9
DKQ
DNQ
DKS
DNS
DA9
DB9
SPDT
n/a
DPDT
SPDT
FKP
FKT
FAC
FKQ
FKS
FA9
DPDT
FNP
FNT
FBC
FNQ
FNS
FB9
-50 to +450
(-46 to +232)
-50 to +450
(-46 to +232)
-50 to +450
(-46 to +232)
SPDT
n/a
HMC
HEK
n/a
DPDT
n/a
HMF
HET
n/a
SPDT
n/a
HM3
HM4
HA9
DPDT
n/a
HM7
HM8
HB9
PNEUMATIC SWITCH MECHANISM AND ENCLOSURE
Switch
Description
Series J
Bleed Type
Series K
Non-Bleed
Maximum
Supply
Pressure
psig
bar
Maximum
Process
Temperature
°F
°C
100
60
60
100
40
400
400
450
400
400
7
4
4
7
3
204
204
232
204
204
46-620 B73 & Series 75 Liquid Level Switches
Bleed
Orifice
Diameter
inches mm
.063
.094
.055
—
—
1.6
2.3
1.4
—
—
Models with
Material of Construction
Code 1
Code 2, 3 or 4
NEMA 1
NEMA 1
JDG
JEG
JFG
—
KOG
JDE
JEE
JFE
KOE
—
25
7.2
Series 75
MODEL NUMBER CODE
Min. S.G. for models with Model Material of Construction Code
Code
1
2
3&4
CARBON STEEL CHAMBER
B75
0.67
0.71
n/a
C75
0.55
0.59
n/a
F75
0.55
0.56
n/a
G75
0.53
0.56
n/a
J75
0.48
0.51
n/a
K75
0.39
0.40
n/a
L75
0.40
0.42
n/a
N75
0.32
0.33
n/a
S75 0.60
n/a
n/a
V75 0.74
0.81
n/a
Z75 0.68
0.71
n/a
STAINLESS STEEL CHAMBER
C75
n/a
n/a
0.60
J75
n/a
n/a
0.57
O75
n/a
n/a
0.85
P75
n/a
n/a
0.75
psig @ ° F 750
900 100
550
1000
500
1000
750
400
600
300
450
1500
2240
2193
870
435
870
653
—
—
—
—
1275
1913
1913
716
400
800
600
250
375
185
280
1045
1455
1425
500
400
500
400
435
—
435
—
400
225
400
225
Pressure Rating
bar @ ° C 399
482 1000 38
288
538 357
357
523
338
—
—
—
—
523
728
713
138
138
200
130
—
—
—
—
n/a
n/a
n/a
69
34
69
52
28
41
21
31
103
154
151
60
30
60
45
—
—
—
—
88
132
132
49
28
55
41
17
26
13
19
72
100
98
25
25
36
23
—
—
—
—
36
50
49
10
10
14
9
—
—
—
—
n/a
n/a
n/a
385
—
385
—
380
—
380
—
34
28
34
28
30
—
30
—
28
16
28
16
26
—
26
—
26
—
26
—
MATERIALS OF CONSTRUCTION
1
2
3
4
Carbon steel chamber, 316 stainless steel float, 400 stainless steel trim
Carbon steel chamber, 316 stainless steel float, 316 stainless steel trim
304 Stainless steel chamber, 316 stainless steel float, 316 stainless steel trim
316 Stainless steel chamber, 316 stainless steel float, 316 stainless steel trim
TANK CONNECTION TYPE AND SIZE
Size
2"
11⁄2" Type
Material
1"
Threaded
Side/Bottom
CS
B20
C20
D20
SS
B20
C20
D20
Socket Weld
Side/Bottom
CS
B20
C30
D30
SS
B30
C30
D30
Cage Mounting Flange Rating (lbs.)
150
300
600
900 150
300
N50
N60
P40
Flanged Upper
Side/Bottom
CS
N30
N40
SS
N30
N40
Flanged
Side/Side
CS
S30
S40
SS
S30
S40
P30
600
900 150
300
600
900 P50
P60
Q30
Q40
Q50
Q60
V30
V40
V50
V60
Consult Factory
S50
S60
T30
T40
T50
T60
Consult Factory
PNEUMATIC SWITCH MECHANISM AND ENCLOSURE
Switch
Description
Series J
Bleed Type
Series K
Non-Bleed
Maximum
Supply
Pressure
psig
bar
Maximum
Bleed
Process
Orifice
Temperature
Diameter
°F
° C inches mm
Excluding
S75, V75 & Z75 S75, V75 & Z75
NEMA 1
NEMA 1
100
60
60
7
4
4
400
400
700
204
204
371
.063
.094
.055
1.6
2.3
1.3
JDE
JEE
JFE
JKE
JLE
JME
100
7
400
204
—
—
KOE
KPE
Electric switch mechanism and enclosure
codes on the following page.
See Notes on back cover.
26
46-620 B73 & Series 75 Liquid Level Switches
ELECTRIC SWITCH MECHANISM AND ENCLOSURE
Switch
Description
Series B
Snap Switch
Series C
Snap Switch
Series D DC Current
Snap Switch
Series F
Hermetically Sealed
Snap Switch
Series HS
Hermetically Sealed
5-amp Snap Switch
with Wiring Leads
All Models with
Material of Construction Code 1
except Models S75, V75 & Z75
Process Temperature
Set
Contacts
TYPE 4X/7/9 Aluminum Enclosure
Range
Points
ATEX
ATEX
°F (°C)
Class I, Div 1 Class I, Div 1
Class I, Div 1 Class I, Div 1
Ex II 2 G EEx
Ex II 2 G EEx
Groups C&D
Group B
Groups C&D
Group B
d IIC T6
d IIC T6
1
BKA
BKJ
BCC
BKB
BKK
BC9
SPDT
2
BLA
BLJ
BDC
BLB
BLK
BD9
-40 to +250
3
BMA
BMJ
BEC
BMB
BMK
BE9
(-40 to +121)
1
BNA
BNJ
BFC
BNB
BNK
BF9
DPDT
2
BOA
BOJ
BGC
BOB
BOK
BG9
1
CKA
CKJ
CCC
CKB
CKK
CC9
SPDT
2
CLA
CLJ
CDC
CLB
CLK
CD9
-40 to +450
3
CMA
CMJ
CEC
CMB
CMK
CE9
(-40 to +232)
1
CNA
CNJ
CFC
CNB
CNK
CF9
DPDT
2
COA
COJ
CGC
COB
COK
CG9
1
DKB
DKK
DC9
DKB
DKK
DC9
SPDT
2
DLB
DLK
DD9
DLB
DLK
DD9
-40 to +250
3
DMB
DMK
DE9
DMB
DMK
DE9
(-40 to +121)
1
DNB
DNK
DF9
DNB
DNK
DF9
DPDT
2
DOB
DOK
DG9
DOB
DOK
DG9
1
FKA
FKJ
FCC
FKB
FKK
FC9
SPDT
2
FLA
FLJ
FDC
FLB
FLK
FD9
-50 to +750
(-46 to +399)
1
FNA
FNJ
FFC
FNB
FNK
FF9
DPDT
2
FOA
FOJ
FGC
FOB
FOK
FG9
1
HMJ
HMK
HMJ
HMK
SPDT
2
HMN
HMP
HMN
HMP
-50 to +550
N/A
N/A
(-46 to +288)
1
HMS
HMT
HMS
HMT
DPDT
2
HMY
HMZ
HMY
HMZ
Series HS
Hermetically Sealed
5-amp Snap Switch
with Terminal Block
-50 to +550
(-46 to +288)
Series H1
Hermetically Sealed
1-amp Snap Switch
with Wiring Leads
-50 to +750
(-46 to +399)
Series R
High Temperature
Snap Switch
-40 to +750
(-40 to +399)
Series 8
Hermetically Sealed
Snap Switch
-50 to +750
(-46 to +399)
Series 9
High Temperature
Hermetically Sealed
Snap Switch
-50 to +750
(-46 to +399)
Switch
Description
Series R
High Temperature
Snap Switch
Series 9
High Temperature
Hermetically Sealed
Snap Switch
All models with
Material of Construction Codes 2
and all Models S75, V75 & Z75
SPDT
1
HM3
HM4
HA9
HM3
HM4
HA9
DPDT
1
HM7
HM8
HB9
HM7
HM8
HB9
SPDT
1
HKJ
HKK
HKJ
HKK
HKN
HKP
RKB
RLB
RNB
ROB
8KB
8LB
8MB
8NB
8OB
9KB
9LB
9MB
9NB
9OB
RKK
RLK
RNK
ROK
8KK
8LK
8MK
8NK
8OK
9KK
9LK
9MK
9NK
9OK
N/A
DPDT
SPDT
DPDT
SPDT
DPDT
SPDT
DPDT
2
HKN
HKP
1
2
1
2
1
2
3
1
2
1
2
3
1
2
RKB
RLB
RNB
ROB
8KA
8LA
8MA
8NA
8OA
9KA
9LA
9MA
9NA
9OA
RKK
RLK
RNK
ROK
8KJ
8LJ
8MJ
8NJ
8OJ
9KJ
9LJ
9MJ
9NJ
9OJ
RC9
RD9
RF9
RG9
8CC
8DC
8EC
8FC
8GC
9CC
9DC
9EC
9FC
9GC
N/A
RC9
RD9
RF9
RG9
8C9
8D9
8E9
8F9
8G9
9C9
9D9
9E9
9F9
9G9
Process Cast Iron
Cast Iron
CS/Aluminum
CS/Aluminum
Set
Temp. Range Contacts
Class
I,
Div
1
Class
I,
Div
1
Class
I,
Div
1 Class I, Div 1
Points NEMA 4X
NEMA 4X
°F (°C)
Groups C&D
Group B
Groups C&D
Group B
1
R1M
RKM
RKW
R1M
RKM
RKW
SPDT
2
R3M
RLM
RLW
R3M
RLM
RLW
-40 to +1000
(-40 to +538)
1
RDM
RNM
RNW
RDM
RNM
RNW
DPDT
2
REM
ROM
ROW
REM
ROM
ROW
1
9AD
9KD
9KV
9AM
9KM
9KW
SPDT
2
9BD
9LD
9LV
9BM
9LM
9LW
-50 to +1000
3
9CD
9MD
9MV
9CM
9MM
9MW
(-46 to +538)
1
9DD
9ND
9NV
9DM
9NM
9NW
DPDT
2
9ED
9OD
9OV
9EM
9OM
9OW
See Notes on back cover.
46-620 B73 & Series 75 Liquid Level Switches
27
NOTES (FOR SECTION 7.2)
Minimum specific gravity ratings apply only to single stage units.
Consult factory for two or three stage units.
Models are limited to maximum temperature rating of selected switch
mechanism. See Switch Mechanism charts on pages 26 and 27.
Use caution when specifying carbon steel and stainless steel for temperatures greater than +800° F (+427° C), as they become sensitized.
S75, V75 & Z75 contain 17-7 ph float.
The O75 and P75 are not available with 11⁄2" and 2" process connections.
Valid for Models V75 & Z75 only.
Consult factory for TYPE 4X/7/9 cast iron housings.
11
12
Process temperature based on +100° F (+38° C) ambient.
Drain or uncontrolled housing heater available in TYPE 4X/7/9 enclosures. Consult factory for standard part number.
HS and H1 switches can be used with materials of construction code 1
only on models S75, V75 & Z75.
On steam and other condensing applications, temperature down-rated to
+400° F (+204° C) process at +100° F (+38° C) ambient.
R series switch supplied in cast iron switch enclosure.
ASSURED QUALITY & SERVICE COST LESS
Service Policy
Return Material Procedure
Owners of Magnetrol controls may request the return of a
control or any part of a control for complete rebuilding or
replacement. They will be rebuilt or replaced promptly.
Controls returned under our service policy must be
returned by Prepaid transportation. Magnetrol will repair
or replace the control at no cost to the purchaser (or
owner) other than transportation if:
So that we may efficiently process any materials that are
returned, it is essential that a “Return Material
Authorization” (RMA) number be obtained from the factory, prior to the material's return. This is available
through Magnetrol’s local representative or by contacting
the factory. Please supply the following information:
1. Returned within the warranty period; and
2. The factory inspection finds the cause of the claim
to be covered under the warranty.
If the trouble is the result of conditions beyond our control; or, is NOT covered by the warranty, there will be
charges for labor and the parts required to rebuild or
replace the equipment.
In some cases it may be expedient to ship replacement
parts; or, in extreme cases a complete new control, to
replace the original equipment before it is returned. If
this is desired, notify the factory of both the model and
serial numbers of the control to be replaced. In such
cases, credit for the materials returned will be determined
on the basis of the applicability of our warranty.
1.
2.
3.
4.
5.
Company Name
Description of Material
Serial Number
Reason for Return
Application
Any unit that was used in a process must be properly
cleaned in accordance with OSHA standards, before it is
returned to the factory.
A Material Safety Data Sheet (MSDS) must accompany
material that was used in any media.
All shipments returned to the factory must be by prepaid
transportation.
All replacements will be shipped F.O.B. factory.
No claims for misapplication, labor, direct or consequential damage will be allowed.
5300 Belmont Road • Downers Grove, Illinois 60515-4499 • 630-969-4000 • Fax 630-969-9489 • www.magnetrol.com
145 Jardin Drive, Units 1 & 2 • Concord, Ontario Canada L4K 1X7 • 905-738-9600 • Fax 905-738-1306
Heikensstraat 6 • B 9240 Zele, Belgium • 052 45.11.11 • Fax 052 45.09.93
Regent Business Ctr., Jubilee Rd. • Burgess Hill, Sussex RH15 9TL U.K. • 01444-871313 • Fax 01444-871317
Copyright © 2010 Magnetrol International, Incorporated. All rights reserved. Printed in the USA.
CSA logotype is a registered trademark of Canadian Standards Association
BULLETIN: 46-620.16
EFFECTIVE: August 2010
SUPERSEDES: March 2008