Magnetrol B75-1B20-JDG Bleed type valve for liquid level switch Datasheet

Series J
Pneumatic Switch
Mechanism
Installation and Operating Manual
Bleed
Type
Valve
for
Liquid
Level
Switches
Read this Manual Before Installing
This manual provides information on the Series J
Pneumatic Switch Mechanism. It is important that all
instructions are read carefully and followed in sequence.
Detailed installation and hook-up instructions are included
in 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 box 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.
Safety Messages
Follow all standard industry procedures for servicing electrical equipment when working with or around high
voltage. Always shut off the power supply before touching
any components.
Low Voltage Directive
For use in Installations Category II, Pollution Degree 2.
If equipment is used in a manner not specified by the
manufacturer, protection provided by equipment may
be impaired.
Notice of Copyright, and Limitations
Copyright © 2009 Magnetrol International, Incorporated.
All rights reserved.
Magnetrol reserves the right to make changes to the
product 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.
42-685 Series J Pneumatic Switch Mechanism
1.0
Description
The Series ‘J’ Pneumatic Switch is a single airline, bleed
type valve with a magnetically actuated flapper. The movement of the magnet assembly causes the switch to change
state, either moving the flapper away from the nozzle allowing the pressure in the line to vent or moving the flapper
against the nozzle causing pressure to build up in the line.
2.0
Principle of Operation
Figure 1 shows the attraction sleeve and magnet in the position when the liquid level is such that the attraction sleeve is
below the field of the magnet. In this position, the flapper
has been drawn away from the nozzle by the fall-out spring;
and, air flows faster through the nozzle than it can be supplied through the restriction. The air pressure to the control
valve then drops to zero.
Figure 2 shows the attraction sleeve when it is within the
field of the magnet. When a change in the liquid level
moves the attraction sleeve into the field of the magnet, it
causes the magnet to pull in against the enclosing tube. In
this position, the flapper is held against the nozzle, thus
shutting off the bleed of air. The air pressure to the control
valve builds up to supply pressure. The switch is reversible
with two simple adjustments described on page 4.
NOTE: Clean, dry, regulated air should be used with the pneumatic
switch.
Non-magnetic
enclosing tube
Non-magnetic
enclosing tube
D
R
R
Reverse link
position for
opposite action
Attraction sleeve
Bleed
restriction
D
Attraction sleeve
Reverse link
position for
opposite action
Bleed
restriction
Air supply
Flapper
Nozzle
To control
valve
Magnet (swing
out position)
Falling
level
Figure 1
Attraction sleeve below field of magnet
42-685 Series J Pneumatic Switch Mechanism
Magnet (swing
in position)
Air supply
Nozzle Flapper
To control
valve
Rising
level
Figure 2
Attraction sleeve in field of magnet
3
3.0
Reversing Pilot Action
All Series J Pneumatic Switch Mechanisms are shipped from
the factory set-up for direct action; closed at high level.
They can be field modified for the reverse (open) position
by following the steps below:
1. First remove the upper shoulder screw from the actuator
link and move it from the direct (D) position to the reverse
(R); refer to Figure 3.
2. Loosen the screw that positions the spring bracket and
move it from the direct (D) position to the reverse (R)
position; refer to Figure 4.
3. Fasten screw securely.
The switch is now setup for reverse action.
Enclosing tube
Enclosing tube
Reverse position
Fall out spring
Direct position
Direct position
Spring bracket
Upper shoulder
screw
Air line
adapter
Actuator link
Figure 3
4
Reverse
position
Air line
adapter
Figure 4
42-685 Series J Pneumatic Switch Mechanism
4.0
Locating Air Line Connection
The air line connection may be rotated a full 360° for your
convenience in connecting the instrument air supply. To
rotate the switch and base assembly:
1. Loosen both the locking screw above the enclosing tube
nut and the frame screw. Refer to Figure 5.
2. Rotate the entire base to the desired position.
3. Tighten both the locking screw and the frame screw.
Enclosing tube
Fall-out stop
Frame screw
Air line
adapter
Magnet
4.0.1 Remove complete mechanism
1. Disconnect air line from air line adapter.
2. Loosen both the locking screw above the enclosing tube
nut, and the frame screw approximately 3 to 4 turns.
Refer to Figure 5.
3. Lift the entire base and switch assembly straight up and off
the enclosing tube.
Base
Enclosing
tube nut
Locking screw
Figure 5
5.0
Preventive Maintenance
5.0.1 Nozzle cleaning
1.
2.
Enclosing tube
3.
Flapper
adjustment screw
4.
⁄16" Allen
wrench
1
Strainer
5.
6.
7.
Flapper
O-Ring
To clean the nozzle, follow the steps below:
Unscrew and remove the adapter. Refer to Figure 6.
The o-ring and strainer will now fall out when the switch
is tipped.
Unscrew the flapper adjustment screw with a 1⁄16" Allen
wrench. This will prevent damage to the flapper when
performing step 4.
Insert a 1⁄16" diameter wire into the nozzle from the air line
connection side. Refer to Figure 7. The wire may be moved
back and forth to clean the opening of any accumulated
matter.
Reassemble the o-ring, strainer, and air line adapter; insert
into nozzle. Refer to Figure 6.
Securely tighten the air line adapter.
Readjust the flapper to its original position; refer to
Section 5.02 Nozzle flapper readjustment on page 6.
Nozzle
Air line
adapter
Figure 6
42-685 Series J Pneumatic Switch Mechanism
5
5.0.2 Nozzle flapper readjustment
1. Connect an air line to the adapter.
2. Pressurize the air line.
3. Adjust the flapper adjustment screw for the desired action:
Enclosing
tube
Magnet
(yellow
or red
dot)
Direct Action
a. Hold the magnet against the enclosing tube.
b. Adjust the flapper adjustment screw with a 1⁄16"
Allen wrench until the air flow stops, plus an
extra one-eighth turn.
Floppy adjustment
screw
1
⁄16"
Diameter
wire
Reverse Action
a. Hold the magnet against the fall out stop. Refer
to Figure 5 on page 5.
b. Adjust the flapper adjustment screw with a 1⁄16"
Allen wrench until the air flow stops.
4. Manually actuate the switch under pressure to
assure its correct actuation. The unit is now
ready for service.
Flapper
Nozzle
Figure 7
6.0
Replacement Parts
6.1
J Series pneumatic switch
Replacement parts for J Series Pneumatic Switch Mechanisms
are available as an assembly only. When ordering an assembly, be certain to specify:
1. The model number of the level control in which the switch
was installed, for example B75-1B20-JDE.
2. The serial number of the level control in which the switch
was installed. Refer to nameplate attached to control
3. The part number of the replacement switch assembly, for
example 89-7501-026.
Description
Red
Dot
Yellow
Dot
Yellow
Dot
JDG, JGH
JEG, JHH
JFG, JJH
JDE, JGF
JEE, JHF
JFE, JJF
JKE, JNF
JLE, JPF
JME, JRF
Part Number
89-7501-027
89-7501-029
89-7501-031
89-7501-026
89-7501-028
89-7501-030
89-7501-032
89-7501-033
89-7501-034
For models rated below 1480 psig.
For models rated above 1480 psig.
6
42-685 Series J Pneumatic Switch Mechanism
6.2
Switch housing replacement assembly
Standard carbon steel housing replacement assemblies are
available. Refer to Figure 8.
Replacement Kit Part Number
Description
Standard
housing cover
Gray Cover
Blue Cover
89-6509-003 Short 4" (102 mm)
89-6523-002
Tall 6" (152 mm)
89-6523-001
89-6510-003 89-6508-001
89-6508-001
Cover assembly hardware
Includes assembly hardware kit 89-6508-001.
Figure 8
Carbon steel housing assembly
7.0
Switch Codes
Magnetrol level controls are identified by an alpha-numeric numbering system. The last digits describe
the type of switch mechanism furnished.
SWITCH MECHANISM AND ENCLOSURE
Switch Code
Red
Dot
Yellow Dot
Maximum Orifice
Maximum
Process Diameter
Supply
Temp.
in. (mm)
Cover
Height
in. (mm)
JDG
JDE
JKE
100 psig
(6 bar)
400° F
(204° C)
.063
(1)
4
(101)
JEG
JEE
JLE
60 psig
(4 bar)
400° F
(204° C)
.094
(2)
4
(101)
JFG
JFE
JME
60 psig
(4 bar)
700° F
(371° C)
.055
(1)
4
(101)
JGH
JGF
JNF
100 psig
(6 bar)
400° F
(204° C)
.063
(1)
6
(152)
JHH
JHF
JPF
60 psig
(4 bar)
400° F
(204° C)
.094
(2)
6
(152)
JJH
JJF
JRF
60 psig
(4 bar)
700° F
(371° C)
.055
(1)
6
(152)
For models rated below 1480 psig.
For models rated above 1480 psig.
NOTE: Maximum leakage rate is .5 SCFH
at maximum supply pressure.
Example Model Number:
B
7
5
1
B
2
42-685 Series J Pneumatic Switch Mechanism
0
7
ASSURED QUALITY & SERVICE COST LESS
Service Policy
Return Material Procedure
Owners of Magnetrol 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.
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Copyright © 2009 Magnetrol International, Incorporated. All rights reserved. Printed in the USA.
BULLETIN: 42-685.4
EFFECTIVE: February 2005
SUPERSEDES: April 1997
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