montage sommet flotteurs - Instruction Manual

T20 & T21
Top mounting
Liquid level switches
®
INSTRUCTION MANUAL AND REPLACEMENT PARTS
DESCRIPTION
T20 and T21 units are simple, reliable float switches
designed for top mounting to tanks or vessels. T20 units
utilize a single switch mechanism and float. T21 tandem
units utilize two switch mechanisms and two separate
floats when widely spaced actuating levels are required.
T20 and T21 tandem models are available for any type of
open or closed vessel with either threaded or flanged type
mounting and actuating depths up to 1219 mm (48 inches)
OPERATING PRINCIPLE
A permanent magnet ① is attached to a pivoted switch
actuator ②. As the float/ displacer ③ rises following the liquid level, it raises the attraction sleeve ④ into the field of
the magnet, which then snaps against the non-magnetic
enclosing tube ⑤, actuating the switch. The enclosing tube
provides a static pressure boundary between the switch
mechanism and the process. On a falling level, an inconel
spring retracts the magnet, deactivating the switch.
②
pivot
⑤
return spring
④
③
①
AGENCY APPROVALS
Agency
Approval
ATEX
II 2G EEx d II C T6, explosion proof
II 1G EEx ia II C T6, intrinsically safe
CENELEC
CCE ➀
EEx d II C T6, explosion proof
FM
Class I, Div. 1, Groups C & D
Class II, Div. 1, Groups E, F & G, Type NEMA 7/9
Non-Hazardous area
rising level
falling level
FM/CSA ➁
R1 (1) 136/MI/433, explosion proof
Explosion proof area –
Groups B, C, D, E, F & G Type NEMA 4X/7/9
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.
SAA ➁
LRS
Explosion proof area
Lloyds Register of Shipment (marine applications)
GOST/
GOSGORTECHNADZOR ➁
Russian Authorisation Standards
Other approvals are available, consult factory for more details
➀ For CCE approved units, use the ATEX explosion proof model
numbers.
➁ Consult factory for proper model numbers.
MODEL IDENTIFICATION
A complete measuring system consists of:
1. Code for top mounted models (each unit can be factory calibrated when specific level differentials are specified separately
– specify actuating level(s) for either rising or falling level and operating S.G.)
2. Code for modified models or adders: put an "X" in front of the closest matching order code and specify the modifications/
adders separately
eg. XT20-AB2A-AAP
X = with material certification EN 10204 / DIN 50049-3.1.B
1. Code for top mounting liquid float level switches
BASIC MODEL NUMBER1
T 2 0
T 2 1
single float
tandem float
- top mounted liquid float level switch
- top mounted liquid float level switch
MATERIALS OF CONSTRUCTION
Code
Cage & process
connection material
A
316 SST (1.4401)
316/316L (1.4401/1.4404)
D
Magnetic sleeve
400 series SST
Carbon steel
B
Float and trim
316 SST (1.4401)
PROCESS CONNECTION
1"
4"
5"
6"
DN 100
DN 150
Float sizes
ø 76 x 127 mm (3" x 5")
ø 102 mm (4")
ø 114 mm (4 1/2")
Threaded NPT connection - for T20 models only
B2A
B2B
B2C
ANSI Flanges - for all models
150 lbs RF
300 lbs RF
150 lbs RF
300 lbs RF
150 lbs RF
300 lbs RF
H3A
H4A
J3A
J3B
J3C
K3A
K4A
K3B
K4B
K3C
K4C
DIN flanges form to DIN 2526 - for all models
PN 16
PN 25/40
PN 16
PN 25/40
PN 16
PN 25/40
Form C
Form C
Form C
Form C
Form C
Form C
8FA
8GA
9FA
9GA
9FB
9GB
9FC
9GC
SWITCH MECHANISM & ENCLOSURE (see page 3)
complete code for top mounted models
2
MODEL IDENTIFICATION (cont.)
Select electric switch mechanism & enclosure for models T20 (see page 3 for switch ratings)
All models with material code A
Weather proof
(IP 66)
qty and
switch
type
A
3
B
C
D
F
HS
U
V
W
X
cast Aluminium
All models with material codes B and D
ATEX (IP 66)
FM (IP 66)
II 2G EEx d IIC T6 II 1G EEx ia II C T6 II 2G EEx d IIC T6
NEMA 7/9
Weather proof
(IP 66)
cast Iron
cast Alu.
cast Aluminium
M20 x 1,5 3/4" NPT
cast Aluminium
cast Aluminium
ATEX (IP 66)
FM (IP 66)
II 2G EEx d IIC T6 II 1G EEx ia II C T6 II 2G EEx d IIC T6
cast Aluminium
cast Aluminium
NEMA 7/9
cast Iron
cast Alu.
M20 x 1,5 3/4" NPT
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
1 x SPDT
A2P
AAP
AHC
AAC
-
-
AK7
AU7
AKP
A2Q
AAQ
AH9
AA9
-
-
AK5
AU5
AKQ
1 x DPDT
A8P
ADP
AJC
ABC
-
-
AD7
AW7
ANP
A8Q
ADQ
AJ9
AB9
-
-
AD5
AW5
ANQ
1 x SPDT
32P
3AP
3HC
3AC
-
-
3K7
3U7
3KP
32Q
3AQ
3H9
3A9
-
-
3K5
3U5
3KQ
1 x DPDT
38P
3DP
3JC
3BC
-
-
3D7
3W7
3NP
38Q
3DQ
3J9
3B9
-
-
3D5
3W5
3NQ
1 x SPDT
B2P
BAP
BHC
BAC
-
-
BK7
BU7
BKP
B2Q
BAQ
BH9
BA9
-
-
BK5
BU5
BKQ
1 x DPDT
B8P
BDP
BJC
BBC
-
-
BD7
BW7
BNP
B8Q
BDQ
BJ9
BB9
-
-
BD5
BW5
BNQ
1 x SPDT
C2P
CAP
CHC
CAC
C2L
CAL
CK7
CU7
CKP
C2Q
CAQ
CH9
CA9
C2S
CAS
CK5
CU5
CKQ
1 x DPDT
C8P
CDP
CJC
CBC
C8L
CDL
CD7
CW7
CNP
C8Q
CDQ
CJ9
CB9
C8S
CDS
CD5
CW5
CNQ
1 x SPDT
-
-
-
-
-
-
-
-
-
D2Q
DAQ
DH9
DA9
-
-
DK5
DU5
DKQ
1 x DPDT
-
-
-
-
-
-
-
-
-
D8Q
DDQ
DJ9
DB9
-
-
DD5
DW5
DNQ
1 x SPDT
F2P
FAP
FHC
FAC
-
-
FK7
FU7
FKP
F2Q
FAQ
FH9
FA9
-
-
FK5
FU5
FKQ
1 x DPDT
F8P
FDP
FJC
FBC
-
-
FD7
FW7
FNP
F8Q
FDQ
FJ9
FB9
-
-
FD5
FW5
FNQ
1 x SPDT
-
-
-
-
-
-
-
-
-
H7A
HM2
HFC
HA9
-
-
HB3
HB4
HM3
1 x DPDT
-
-
-
-
-
-
-
-
-
H7C
HM6
HGC
HB9
-
-
HB7
HB8
HM7
1 x SPDT
U2P
UAP
UHC
UAC
U2L
UAL
UK7
UU7
UKP
U2Q
UAQ
UH9
UA9
U2S
UAS
UK5
UU5
UKQ
1 x DPDT
U8P
UDP
UJC
UBC
U8L
UDL
UD7
UW7
UNP
U8Q
UDQ
UJ9
UB9
U8S
UDS
UD5
UW5
UNQ
-
-
-
-
-
VFS
VHS
-
-
-
-
-
-
-
V5S
VBS
-
-
-
1 x SPDT
W2P
WAP
WHC
WAC
W2L
WAL
WK7
WU7
WKP
W2Q
WAQ
WH9
WA9
W2S
WAS
WK5
WU5
WKQ
WNQ
1 x DPDT
-
-
-
-
-
-
-
-
-
W8Q
WDQ
WJ9
WB9
W8S
WDS
WD5
WW5
1 x SPDT
X2P
XAP
XHC
XAC
X2L
XAL
XK7
XU7
XKP
X2Q
XAQ
XH9
XA9
X2S
XAS
XK5
XU5
XKQ
1 x DPDT
-
-
-
-
-
-
-
-
-
X8Q
XDQ
XJ9
XB9
X8S
XDS
XD5
XW5
XNQ
Select pneumatic switch mechanism & enclosure - for models T20 only
Pneumatic switch type
NEMA 3R (IP 53)
Max supply pressure
bar (psi)
Max liquid temperature
°C (°F)
Bleed orifice Ø
mm (inches)
material code A
material codes B & D
6,9 (100)
200 (400)
1,60 (0.063)
JDG
JDE
4,1 (60)
200 (400)
2,39 (0.094)
JEG
JEE
4,1 (60)
370 (700)
1,40 (0.055)
JFG
JFE
6,9 (100)
200 (400)
–
KOE
KOE
2,8 (40)
200 (400)
–
KOG
–
Series J
(open air)
Series K
(closed circuit)
Select electric switch mechanism & enclosure for models T21
All models with material code A
qty and
switch
type
A
3
B
C
D
F
U
W
X
Weather proof
(IP 66)
cast Aluminium
All models with material codes B and D
ATEX (IP 66)
FM (IP 66)
II 2G EEx d II C T6 II 1G EEx ia II C T6 II 2G EEx d II C T6 NEMA 7/9
cast Aluminium
cast Aluminium
Weather proof
(IP 66)
FM (IP 66)
cast Iron
cast Alu.
M20 x 1,5 3/4" NPT
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
AV7
ALA
A4B
ABB
AL9
AD9
-
-
AL5
AV5
ALB
AO7
AY7
AOA
A1B
AEB
AP9
AG9
-
-
AO5
AY5
AOB
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
M20 x 1,5
1" NPT
2 x SPDT
A4A
ABA
ALC
ADC
-
-
AL7
2 x DPDT
A1A
AEA
APC
AGC
-
-
cast Aluminium
ATEX (IP 66)
II 2G EEx d II C T6 II 1G EEx ia II C T6 II 2G EEx d II C T6 NEMA 7/9
cast Aluminium
cast Aluminium
cast Iron
cast Alu.
M20 x 1,5 3/4" NPT
1" NPT
2 x SPDT
34E
3BE
39E
3DE
-
-
3L7
3V7
3LE
34B
3BB
3L9
3D9
-
-
3L5
3V5
3LB
2 x DPDT
31A
3EA
3PC
3GC
-
-
3O7
3Y7
3OA
31B
3EB
3P9
3G9
-
-
3O5
3Y5
3OB
2 x SPDT
B4A
BBA
BLC
BDC
-
-
BL7
BV7
BLA
B4B
BBB
BL9
BD9
-
-
BL5
BV5
BLB
2 x DPDT
B1A
BEA
BPC
BGC
-
-
BO7
BY7
BOA
B1B
BEB
BP9
BG9
-
-
BO5
BY5
BOB
2 x SPDT
C4A
CBA
CLC
CDC
C4X
CBX
CL7
CV7
CLA
C4B
CBB
CL9
CD9
C4T
CBT
CL5
CV5
CLB
2 x DPDT
C1A
CEA
CPC
CGC
C1X
CEX
CO7
CY7
COA
C1B
CEB
CP9
CG9
C1T
CET
CO5
CY5
COB
2 x SPDT
D4B
DBB
DL9
DD9
-
-
DL5
DV5
DLB
D4B
DBB
DL9
DD9
-
-
DL5
DV5
DLB
2 x DPDT
D1B
DEB
DP9
DG9
-
-
DO5
DY5
DOB
D1B
DEB
DP9
DG9
-
-
DO5
DY5
DOB
2 x SPDT
FFA
FBA
FLC
FDC
-
-
FL7
FV7
FLA
FFB
FBB
FL9
FD9
-
-
FL5
FV5
FLB
2 x DPDT
FHA
FEA
FPC
FGC
-
-
FO7
FY7
FOA
FHB
FEB
FP9
FG9
-
-
FO5
FY5
FOB
2 x SPDT
U4A
UBA
ULC
UDC
U4X
UBX
UL7
UV7
ULA
U4B
UBB
UL9
UD9
U4T
UBT
UL5
UV5
ULB
2 x DPDT
U1A
UEA
UPC
UGC
U1X
UEX
UO7
UY7
UOA
U1B
UEB
UP9
UG9
U1T
UET
UO5
UY5
UOB
2 x SPDT
W4A
WBA
WLC
WDC
W4X
WBX
WL7
WV7
WLA
W4B
WBB
WL9
WD9
W4T
WBT
WL5
WV5
WLB
2 x DPDT
W1B
WEB
WP9
WG9
W1T
WET
WO5
WY5
WOB
W1B
WEB
WP9
WG9
W1T
WET
WO5
WY5
WOB
2 x SPDT
X4A
XBA
XLC
XDC
X4X
XBX
XL7
XV7
XLA
X4B
XBB
XL9
XD9
X4T
XBT
XL5
XV5
XLB
2 x DPDT
X1B
XEB
XP9
XG9
X1T
XET
XO5
XY5
XOB
X1B
XEB
XP9
XG9
X1T
XET
XO5
XY5
XOB
3
INSTALLATION
MOUNTING
Before assembling control to tank or vessel, check threaded or flanged mounting nozzle for the following:
– Nozzle length and inside diameter must be sized correctly to allow for switch actuation at design levels within the
maximum differential available (see table on page 4).
– Nozzle should be checked for horizontal alignment.
Finished mounting must allow control switch housing to
be within 3° degrees of vertical for proper operation. A
three degree slant is noticeable by eye, but installation
should be checked with a spirit level.
OBSERVE ALL APPLICABLE ELECTRICAL CODES AND
PROPER WIRING PROCEDURES
NEMA 4x
WIRING
Most mechanical control switch housings are designed to
allow 360° positioning of the cable entries by loosening the
set screw(s). See figure 2. On high temperature applications (above 120° C [250° F]), high temperature wire should
be used between control and first junction box located in a
cooler area.
Set screw
NEMA 7/9
1. To gain access to switch mechanism(s) remove switch
housing cover.
2. Pull in supply wires (conductors), wrap them around
enclosing tube under the baffle plate and connect to correct terminals. Be certain that excess wire does not
interfere with "tilt" of switch and that adequate clearance
exists for replacement of switch housing cover.
CAUTION:
In hazardous area, do not power the unit until
the cable gland is sealed and the enclosure
cover is screwed down securely.
Set screw
Set screw
Position
screw
CAUTION:
- DO NOT attempt to reposition NEMA 4X /
NEMA 7/9 housings without loosening the
set screws.
NOTE: See bulletin on switch mechanism furnished with
your control (as listed below) for proper connections.
3. Connect power supply to control and test switch action
by varying liquid level in tank or vessel.
NOTE: If switch mechanism fails to function properly, check
vertical alignment of control housing and consult installation
instructions in switch mechanism bulletin.
ATEX
4. Replace switch housing cover and place control into service.
NOTE: If control has been furnished with an explosion proof
(cast) or moisture proof (gasketed) switch housing, check
the following:
– After wiring connections have been completed, housings
must be sealed via the correct cable gland to prevent
entrance of air.
– 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 gases into switch housing.
Switch mechanism
Bulletin
Mercury switches
42-783
A
Dry contact switches
42-783
B, C, D, U, W, X
Anti-vibration dry contact switches
42-684
G, H, I
Bleed type pneumatic valve
42-685
J
Non-bleed type pneumatic valve
42-686
K
Anti-vibration mercury switches
4
Reference series
E
Locking screw
Figure 2
CAUTION:
- DO NOT attempt to reposition NEMA 4 /
NEMA 7/9 housings without loosening the
set screws; ATEX housings MAY NOT BE
REPOSITIONNED. ALWAYS retighten set
screw(s) after repositionning.
- DO NOT attempt to unscrew cover of ATEX
housings before loosening locking screw in
base of housing. ALWAYS retighten locking
screw after replacing cover.
SWITCH DIFFERENTIAL ADJUSTMENT
5a. Perform system shut-down procedures as required to
relieve pressure from tank or vessel and drain off liquid
head, if required. Allow unit to cool.
The standard differential of T20 and T21 Liquid Level
Switches may be field adjusted. Adjustment may be necessary if a wider differential needs to be set to overcome
switch chatter caused by the process.
5b. The amount of level travel between switch-on and
switch-off actuations (differential) may be field 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, as shown in Figure 4. This setting may be
increased to a maximum of 13 mm (0.50"), as shown
in Figure 5.
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. The standard factory
setting is for a minimum amount of play (gap) between the
top jam nuts and the attraction sleeve as shown in
Figure 4.
NOTE: For assistance in computing level differential
change for a specific control, consult the factory giving the
model and serial numbers of the control.
6. Remove switch housing assembly by loosening hex
nut, which is located immediately below housing base.
Refer to Figure 3.
CAUTION: Maximum differential adjustment is 13 mm
(0.5").
Switch housing
cover
NOTE: To widen the differential 13 mm (0.5"), the lower
jam nuts must be set proportionately lower on the stem (i.e.
in this example 13 mm (0.5")).
Enclosing tube
Refer to Figures 4 and 5
Cable connexion
CAUTION: Before attempting any work on the control,
pull disconnect switch, or otherwise assure that electrical circuit(s) through the control is deactivated. Close
operating medium supply valve on controls equipped
with pneumatic switch mechanisms.
Housing base
Enclosing tube nut
1. Determine what change in differential is necessary.
2. Make sure power source is turned off.
Float
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 3.
Slight play (gap)
must be allowed
(0.8 mm (.03") typical)
Position of bottom jam
nuts (normal factory
setting)
;;
;
;
;;
;;
;;
;;;
Figure 3
For access to bottom jam
nuts, mark position,
remove top jam nuts,
washer, and attracting
sleeve
;;
;;
;;
;;
;;;
13 mm
(0.50")
Replace in
same position
Maximum gap setting
(Applies to models having
a single switch mechanism
with a single magnet
actuator only)
Drop bottom jam nuts to
increase gap setting
(see instructions below)
Sleeve stop
strap
CAUTION: After increasing gap setting, be certain to
check for proper operation of switch mechanism by raising and lowering float assembly. Magnet must snap cleanly, with additional float movement available after magnet
snaps.
Float
Figure 4
Figure 5
Normal Factory Setting
(minimum differential)
Differential adjustment
5
SWITCH DIFFERENTIAL ADJUSTMENT cont.
7. With switch housing removed, jam nuts and attraction
sleeve are accessible. Measure position of upper jam
nuts from stem end; then loosen and remove upper
jam nuts, guide washer, and attraction sleeve.
8. Loosen and adjust lower jam nuts to desired position.
Make certain jam nuts are retightened securely.
NOTE: Use new gasket in assembly of switch housing to
chamber (Part No. 12-1301-002).
CAUTION: Instructions given are for standard base
model units which use a single magnet switch mechanism only. No differential adjustment should be attempted on tandem float models in the field. Switch actuation
levels have been set at the factory to meet specific customer specifications. Variations in actual conditions
from design conditions usually requires special control
modifications. Consult with the factory or local representative for assistance
9. Test switch actuation by varying liquid level in tank or
vessel.
TROUBLE SHOOTING
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.
— Fuses may be blown.
— Reset button(s) may need resetting.
— Power switch may be open.
— Controlled equipment may be faulty.
— 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.
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 three (3°) degrees of vertical
(Use spirit level on side of enclosing tube in two place, 90°
apart.
7. If mechanism is equipped with a mercury switch,
examine glass mercury tube closely as previously
described in “Preventive Maintenance” section. If
switch is damaged, replace it immediately.
8. If switch mechanism is operating satisfactorily, proceed
to check sensing unit.
CHECK SENSING UNIT
1. Re-connect power supply and carefully actuate switch
mechanism manually (using a non-conductive tool) 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.
6
2. If controlled equipment responds to manual actuation
test, trouble may be located in the level sensing portion
of the control (float, stem and magnetic attraction
sleeve[s]).
NOTE: Check first to be certain liquid is entering storage
tank or vessel. A valve may be closed or pipe line plugged.
3. With liquid in tank or vessel, proceed to check level
sensing action by removing switch housing assembly.
4. Inspect magnetic 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 magnet(s).
5. If differential has been changed in the field, check tightness and position of the jam nuts.
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.
6. Check float to be certain it is buoyant in the liquid (tank
or vessel must have adequate liquid level). If float is
determined to be filled with liquid or collapsed, it must
be replaced immediately. Do NOT attempt to repair a
float.
If all the components in the control are in operating condition, the trouble must be (and should be) located external
to the control. Repeat inspection of external conditions previously described.
NOTE: When in doubt about the condition or performance
of a Magnetrol control, return it to the factory. See “Our
Service Policy” on back page.
PREVENTIVE MAINTENANCE
Periodic inspections are a necessary means to keep your Magnetrol level control in good working order. This control
is, in reality, a safety device to protect the valuable equipment it serves. Therefore, a systematic program of "preventive maintenance" should be implemented when control is placed into service. If the following sections on "what to
do" and "what to avoid" are observed, your control will provide reliable protection of your capital equipment for many
years.
WHAT TO DO
WHAT TO AVOID
1. Keep control clean
1. NEVER leave switch housing cover off the control longer
than necessary to make routine inspections.
NEVER leave switch housing cover off 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 become damaged
or misplaced, order a replacement immediately.
2. NEVER use lubricants on pivots of switch mechanisms.
A sufficient amount of lubricant has been applied at the
factory to insure a lifetime of service. Further oiling is
unnecessary and will only tend to attract dust and dirt
which can interfere with mechanism operation.
2. Inspect switch mechanisms, terminals and connections monthly.
3. NEVER place a jumper wire across terminals to "cutout" the control. If a "jumper" is necessary for test purposes, be certain it is removed before placing control
into service.
– Mercury switches may be visually inspected for short
circuit damage. Check for small cracks in the glass
tube containing the mercury. Such cracks can allow
entrance of air into the tube causing the mercury to
"oxidize". This is noticeable as the mercury will
appear dirty and have a tendency to "string out" like
water, instead of breaking into round pools. If these
conditions exist, replace the mercury switch immediately.
4. NEVER attempt to make adjustments or replace switches without reading instructions carefully. Certain adjustments provided for in Magnetrol controls should not be
attempted in the field. When in doubt, consult the factory or your local Magnetrol representative.
– Dry contact switches should be inspected for excessive wear on actuating lever or misalignment of
adjusting screw at point of contact between screw
and lever. Such wear can cause false switch actuating levels. Adjust switch mechanism to compensate
(if possible) or replace switch.
Do NOT operate your control with defective or maladjusted switch mechanisms (refer to bulletin on switch
mechanism furnished for service instructions).
– Magnetrol controls may sometimes be exposed to
excessive heat or moisture. Under such conditions,
insulation on electrical wires may become brittle,
eventually breaking or peeling away. The resulting
"bare" wires can cause short circuits.
Check wiring carefully and replace at first sign of brittle
insulation.
– Vibration may sometimes cause terminal screws to
work loose. Check all terminal connections to be certain that screws are tight. Air (or gas) operating medium 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.
– On units with pneumatic switches, air (or gas) operating medium lines subjected to vibration, may eventually crack or become loose at 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.
3. Inspect entire unit periodically
Isolate control from vessel. Raise and lower liquid level
to check for switch contact and reset.
7
DIMENSIONAL SPECIFICATIONS mm (inches)
Y
X
Y
X
Z
V
Z
V
W
W
46 (1.81) Ref.
62 (2.44)
1" NPT
Distance to
actuating level
min 102 (4)
Distance to
actuating level
min 102 (4)
Actuating
level
Actuating
level
Model T20 with 1" NPT
Model T20 with flange
Y
X
V
Z
W
46 (1.81) Ref.
Distance to upper
actuating level
min 102 (4)
Actuating
level
Distance to
Maximum
Minimum
Upper level
1016 mm (40")
102 (4")
Lower level
1219 mm (48")
305 (12")
Distance to lower
actuating level
min 204 (8)
Note: On model T21, the lower float actuates the upper
switch mechanism. The upper float actuates the lower
switch mechanism.
Actuating
level
Model T21 with flange
Housing type
Models
WeatherproofFM (NEMA 7/9) ATEX (Cast Alu)
CENELEC (Cast Iron)
Pneumatics
Switch Module J
Pneumatics
Switch Module K
V
W
mm
inches
T21 and T20 with HS-switch
257
10.12
T20 excl. HS-switch
202
7.94
All
249
All
165
øX
mm
inches
mm
inches
mm
inches
42
1.66
151
5.93
109
4.29
9.80
45
1.77
143
5.63
110
4.33
110
4.33
6.50
39
1.54
118
4.65
130
5.12
Allow 200 mm (7.87") overhead clearance / All housings are 360 ° rotatable
8
Y
Z
M20 x 1,5 (*) or 1" NPT
(2 entries - 1 plugged)
(*) not for FM (NEMA 7/9)
M20 x 1,5 or 3/4" NPT
(single entry - 2 entries at request)
1/4" NPT
FLOAT SELECTION AND INSERTION DEPTH
PRESSURE RATINGS
T20/T21 switches are fabricated to meet customer specific
insertion depth, from mounting fitting to actuating level. The
maximum available insertion depth is governed by the liquid specific gravity and selected float size as given in the
table below. The minimum insertion depth is 102 mm (4").
Float ratings are the maximum allowable pressure rating,
even though the tank connections may have higher ratings.
Pressure Rating Bar (PSIG)
@ 40° C
(100° F)
@ Maximum
Temperature
76 x 127 mm
(3.00" x 5.00")
34,5 Bar
(500 PSIG)
20,7 Bar @ 400° C
(300 PSIG @ 750° F)
102 mm
(4")
41,3 Bar
(600 PSIG)
27,6 Bar @ 400° C
(400 PSIG @ 750° F)
114 mm
(4.50")
34,5 Bar
(500 PSIG)
23,4 Bar @ 400° C
(340 PSIG @ 750° F)
T20 models - float sizes
ø 76 x 127 mm
Specific Gravity
(3" x 5")
ø 102 mm
(4")
ø 114 mm
(4 1/2")
0.60
-
-
140 (5.5)
0.70
-
-
914 (36)
0.80
-
254 (10)
1219 (48)
0.90
432 (17)
813 (32)
1219 (48)
1.00
889 (35)
1219 (48)
1219 (48)
T21 models - float sizes ➀
ø 76 x 127 mm ø 102 mm
ø 114 mm
Specific Gravity
(4")
(4 1/2")
(3" x 5")
0.70
711 (28)
0.80
305 (12)
1219 (48)
0.90
406 (16)
660 (26)
1219 (48)
1.00
711 (28)
1016 (40)
1219 (48)
➀ Max actuating levels as per lowest float
9
REPLACEMENT PARTS
ITEM
SINGLE FLOAT MODELS
T20-1
T20-4
DESCRIPTION
1
2
3
4
5
6
7
Housing Cover
Housing Base
Switch Mechanism(s)
Attraction Sleeve
Jam Nuts
Guide Washer(s)
Float Stem
8
Float
9
Attraction Sleeve, Stop
Tube, and Washers
Retaining Rings
Float and Tube Assy.
Adaptor Bushing
Stem Guide Tube ➁
E-Tube Gasket
Enclosing Tube
10
11
12
13
14
15
16
17
Mounting Flange ➂
Float Guide Cage (optional) ➃
18
Guide Cage Gasket
Size
4"
5"
6"
8"
Housing
Kits
BASEEFA & CENELEC
NEMA 4X, NEMA 7/9
Pneumatic housing
(only for T20)
Guide
Cage
Kits
Consult Factory
07-1202-003
NOTES:
➀
All replacements furnished in kit form are for standard base
models which use single magnet switch mechanisms only.
Consult local representative for ordering assistance on all special model replacement parts not included in above listing.
➁
Float stem and tube component lengths are cut to meet
original customer specifications. When ordering these
replacement kits, be certain to always give complete
model and serial numbers of control.
➂
Flanges listed are standard ANSI raised face items. When
ordering, please specify size, type, and part number.
➃
Float cages are specially built to meet original customer specifications. When ordering, specify part numbers of float guide
cage and gasket (as charted above relative to size of float and
mounting flange respectively), as well as an overall cage
length dimension from original assembly.
07-1202-003
07-1102-008
07-1102-009
07-1102-008
07-1102-009
FLOAT SIZE
3 X5
89-3230-001
NOT REQUIRED
4
Consult Factory
4.50
04-5734-126
04-5734-123
04-5734-126
04-5734-123
011-1418-194
011-1418-434
NOT REQUIRED
12-1301-002
032-6344-002
032-6344-001
032-6344-002
032-6344-001
032-6302-031
032-6302-036
032-6302-033
032-6302-037
See Replacement Mounting Flange Chart
Guide Cages are special
order items.
NOT REQUIRED
See Gasket Chart Below
REPLACEMENT MOUNTING FLANGES (Item 16) ➂
125 Lb.
150 Lb.
300 Lb.
150 Lb.
Cast Iron
Forged Steel
Forged Steel
Forged T-304
04-5840-001
04-5840-011
04-5840-016
04-5840-021
04-5840-002
04-5840-012
04-5840-017
04-5840-022
04-5840-003
04-5840-013
04-5840-018
04-5840-023
04-5840-004
04-5840-014
04-5840-019
04-5840-024
IMPORTANT:
When ordering, please specify:
A. Model and serial number of control.
B. Name and number of replacement part or
assembly (Kit).
10
Refer to bulletin on switch mechanism and
housing furnished (listed on page 4).
Float and
Stem Kits
➀➁
FLOAT SIZE
3 X5
4
4.50
Upper Float
and Tube
Assy. Kit
➀➁
TANDEM FLOAT MODELS
T21-1
T21-4
150 Lb.
Forged T316
04-5840-026
04-5840-027
04-5840-028
04-5840-029
CAGE GASKETS (Item 18)
125 Lb. &
300 Lb.
150 Lb.
12-1301-014
12-1301-012
12-1301-008
12-1204-008
12-1301-009
12-1301-013
12-1301-026
12-1301-027
REPLACEMENT PARTS cont.
1
1
4
4
3
3
10
4
2
15
16
;;;;
;;
;;;;
;;;;
;;
5
6
4
2
9
14
12
15
16
;;;;
;;
;;;;
;;;;
;;
5
6
14
12
13
18
7
17
11
8
T20
7
8
T21
11
IMPORTANT
SERVICE POLICY
Owners of Magnetrol products 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. Magnetrol International will repair or replace the control, at no cost to
the purchaser, (or owner) other than transportation cost if:
a. Returned within the warranty period; and,
b. The factory inspection finds the cause of the malfunction to be defective material or workmanship.
If the trouble is the result of conditions beyond our control; or, is NOT covered by the warranty, there will be charges for labour
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.
No claims for misapplication, labour, direct or consequential damage will be allowed.
RETURNED MATERIAL PROCEDURE
So that we may efficiently process any materials that are returned, it is essential that a “Return Material Authorisation” (RMA)
form will be obtained from the factory. It is mandatory that this form will be attached to each material returned. This form is available through Magnetrol’s local representative or by contacting the factory. Please supply the following information:
1. Purchaser Name
2. Description of Material
3. Serial Number
4. Desired Action
5. Reason for Return
6. Process details
All shipments returned to the factory must be by prepaid transportation. Magnetrol will not accept collect shipments.
All replacements will be shipped FOB factory.
BULLETIN N°:
EFFECTIVE:
SUPERSEDES:
UNDER RESERVE OF MODIFICATIONS
www.magnetrol.com
®
BE 44-604.10
JANUARY 2005
February 1997
BENELUX
Heikensstraat 6, 9240 Zele, België
Tel. +32 (0)52.45.11.11 • Fax. +32 (0)52.45.09.93 • E-Mail: [email protected]
DEUTSCHLAND
Alte Ziegelei 2-4, D-51491 Overath
Tel. 02204 / 9536-0 • Fax. 02204 / 9536-53 • E-Mail: [email protected]
FRANCE
40 - 42, rue Gabriel Péri, 95130 Le Plessis Bouchard
Tél. 01.34.44.26.10 • Fax. 01.34.44.26.06 • E-Mail: [email protected]
ITALIA
Via Arese 12, I-20159 Milano
Tel. (02) 607.22.98 (R.A.) • Fax. (02) 668.66.52 • E-Mail: [email protected]
UNITED
KINGDOM
Unit 1 Regent Business Centre, Jubilee Road Burgess Hill West Sussex RH 15 9TL
Tel. (01444) 871313 • Fax (01444) 871317 • E-Mail: [email protected]
INDIA
E-22, Anand Niketan, New Delhi - 110 021
Tel. 91 (11) 6186211 • Fax 91 (11) 6186418 • E-Mail: [email protected]