UE 120 Series User manual

IMP120-14
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120 Series
Explosion-Proof Pressure and
Differential Pressure Switches
Types
J120, J120K, H121, H121K, H122,
H122K, H122P
UNITED ELECTRIC
CONTROLS
Installation and Maintenance
Instructions
IMP120-14
which convert the pressure signal into an electrical signal. Control
set point(s) may be varied by turning the internal adjustment hex
(J120 models) or the external knob and pointer(s) (H121, H122, H122P
models) according to the procedures outlined.
Please refer to product bulletin for product specifications. Product
bulletins may be found at www.ueonline.com.
Date code format on nameplate is “YYWW” for year and week.
Part I -Installation
Tools Needed–Screwdriver/Adjustable Wrench to 1-1/2”
MOUNTING
THE CONNECTION OF THE DEVICE SHALL BE MADE BY
CABLE ENTRIES OR A STOPPING BOX CERTIFIED IN TYPE
OF EXPLOSION PROTECTION FLAMEPROOF ENCLOSURE ‘d,’
SUITABLE FOR THE CONDITIONS OF USE AND CORRECTLY INSTALLED.
THESE ACCESSORIES SHALL BE THREADED INTO THE RELEVANT
OPENING(S) OF THE DEVICE, WITH AT LEAST 5 THREADS ENGAGED
AND WITH AT LEAST 8 mm LENGTH OF THREAD ENGAGEMENT. THESE
ACCESSORIES ARE NOT INCLUDED WITHIN THE DEVICE’S HAZARDOUS
LOCATIONS CERTIFICATE.
TO PREVENT IGNITION, SEAL ALL CONDUIT RUNS WITHIN 18
INCHES OF ENCLOSURE.
ALWAYS HOLD A WRENCH ON THE PRESSURE HOUSING HEX
WHEN MOUNTING UNIT. DO NOT TIGHTEN BY TURNING
ENCLOSURE. THIS WILL DAMAGE SENSOR AND WEAKEN
SOLDER OR WELDED JOINTS.
INSTALL UNITS WHERE SHOCK, VIBRATION AND TEMPERATURE
FLUCTUATIONS ARE MINIMAL. MOUNT UNIT TO PREVENT
MOISTURE FROM ENTERING THE ENCLOSURE. IT IS
IMPERATIVE TO USE PROPERLY RATED EXPLOSION-PROOF SEALING
FITTINGS FOR ELECTRICAL WIRE ENTRY. DO NOT MOUNT UNIT
IN AMBIENT TEMPERATURES THAT EXCEED THE LIMITS ON THE
NAMEPLATE FOR THE APPROPRIATE AREA.
J120 ENCLOSURES ARE PROVIDED WITH TWO 3/4” NPT
ELECTRICAL CONDUIT OPENINGS, EITHER OF WHICH OR BOTH
CAN BE USED DURING INSTALLATION. A 3/4” EXPLOSION
PROOF PLUG IS PROVIDED FOR PROPERLY SEALING THE UNUSED
CONDUIT OPENING. THE EXPLOSION PROOF PLUG MUST BE
PROPERLY SEALED DURING PRODUCT INSTALLATION.
GENERAL
MISUSE OF THIS PRODUCT MAY CAUSE EXPLOSION AND
PERSONAL INJURY. THESE INSTRUCTIONS MUST BE
THOROUGHLY READ AND UNDERSTOOD BEFORE UNIT IS
INSTALLED.
THIS EQUIPMENT IS SUITABLE FOR USE IN CLASS I, DIVISION
1, GROUPS B, C AND D; CLASS II, DIVISION 1, GROUPS E, F
AND G; CLASS III; OR NON-HAZARDOUS LOCATIONS ONLY.
ENCLOSURE TYPE 4X.
THIS EQUIPMENT IS ATEX CERTIFIED FOR EQUIPMENT
CATEGORY 2. SUITABLE FOR APPROPRIATE USE IN GAS ZONE
1 & DUST ZONE 21 APPLICATIONS.
0539 DEMKO 09 ATEX 0815573X
II 2 G Ex d IIC T6
II 2 D Ex tD A21 IP66 T+ 85°C
-40°C ≤ Tamb. ≤ + 75°C
BEFORE INSTALLING, CHECK THE SENSOR MODEL SELECTED
FOR COMPATIBILITY TO THE PROCESS MEDIA IN CONTACT
WITH THE SENSOR AND WETTED PARTS.
PROOF PRESSURE* LIMITS STATED IN THE LITERATURE AND
ON NAMEPLATES MUST NEVER BE EXCEEDED, EVEN BY
SURGES IN THE SYSTEM. OCCASIONAL OPERATION OF UNIT
UP TO MAXIMUM PRESSURE IS ACCEPTABLE (E.G., START-UP, TESTING).
CONTINUOUS OPERATION SHOULD NOT EXCEED THE DESIGNATED
OVER RANGE PRESSURE.
*Proof Pressure: The maximum pressure to which a pressure sensor
may be occasionally subjected, which causes no permanent damage
(e.g., start-up testing). The unit may require re-gapping. (See Part
II- Adjustments)
THESE PRODUCTS DO NOT HAVE ANY FIELD REPLACEABLE
PARTS. ANY SUBSTITUTION OF COMPONENTS MAY IMPAIR
SUITABILITY FOR CLASS I, DIVISION 1.
TO PREVENT IGNITION OF HAZARDOUS ATMOSPHERES,
DISCONNECT SUPPLY CIRCUITS BEFORE OPENING. KEEP
COVER TIGHT WHILE CIRCUITS ALIVE.
The 120 Series pressure and differential pressure switches are
actuated when a bellows, diaphragm or piston sensor responds to
a pressure change. This response at a pre-determined set point(s)
actuates a SPDT, DPDT or dual SPDT snap-acting microswitch(es),
Please read all instructional literature carefully and thoroughly before starting. Refer to the final page for the listing of Recommended
Practices, Liabilities and Warranties.

IMP120-14
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WIRING
FIELD WIRING MUST BE RATED 75°C MINIIMUM. FOR AMBIENT
TEMPERATURES BELOW -10°C, USE SUITABLE FIELD WIRING.
DISCONNECT ALL SUPPLY CIRCUITS BEFORE WIRING UNIT.
WIRE UNITS ACCORDING TO NATIONAL AND LOCAL ELECTRI-
CAL CODES. MAXIMUM RECOMMENDED WIRE SIZE IS 14 AWG.
THE RECOMMENDED TIGHTENING TORQUE FOR FIELD WIRING
TERMINALS IS 7 TO 17 IN-LBS.
ELECTRICAL RATINGS STATED IN LITERATURE AND ON NAME-
PLATES MUST NOT BE EXCEEDED—OVERLOAD ON A SWITCH
CAN CAUSE FAILURE ON THE FIRST CYCLE.
TO PREVENT SEIZURE OF ENCLOSURE COVER, DO NOT
REMOVE LUBRICANT. THREADS SHOULD ALSO BE FREE OF
DIRT, ETC.
THE EXTERNAL GROUNDING TERMINAL IS NOT TO BE USED
AS THE PRIMARY EQUIPMENT GROUNDING TERMINAL. THE
INTERNAL GROUNDING TERMINAL SHALL BE USED AS THE
PRIMARY EQUIPMENT GROUNDING MEANS AND THE EXTERNAL
GROUNDING TERMINAL IS ONLY FOR A SUPPLEMENTAL (SECONDARY)
GROUNDING CONNECTION WHERE LOCAL AUTHORITIES PERMIT OR
REQUIRE SUCH A CONNECTION.
Remove cover and wire control (See Figure 3). Replace cover and
hand tighten to fully engage cover O-ring.
Types J120, J120K, H121, H121K, H122, H122K, H122P
Mount controls vertically (pressure connection facing down, see Figure
1a) or horizontally (see Figure 1b). Control may be surface mounted via
the four 1/4” screw holes on the enclosure or mounting bracket. It can
also be mounted directly to a rigid pipe using the pressure connection.
Controls with Breather Drain (Option M450)
Type J120, J120K Models 455-559
Mount with breather drain facing down (See Figure 1b). The conduit
connection must be “potted” for this type of installation.
Types H121, H122 & H122P, All Models
Mount in vertical position with pressure assembly and breather drain
facing down (See Figure 1a).
Differential Pressure Types J120K, H121K, H122K
Opposed Sensor Models 36-39, (S)147(B)-(S)157(B), 367
“Opposed sensor” differential pressure switches should be mounted
with their pressure connection in the horizontal position (See Figure 2).
This will properly orient the 1/4” NPT venting conduit at the bottom of
the third compartment (standardly supplied with plastic plug).
Figure 2
Opposed Sensor Models
Figure 1b
J120, J120K
Figure 1a:
H121, H121K, H122, H122K, H122P
Figure 3
Use 75°C copper
conductors only.
Recommended
tightening torque for
field wiring terminals
is 7-17 in-lbs.
Figure 4a

IMP120-14
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Part II - Adjustments
Tools Needed
Screwdriver
5/8” Open End Wrench
5/64” Allen Wrench
AFTER COMPLETING ADJUSTMENTS ON TYPE H121 AND H122
CONTROLS, BE SURE TO RE-INSTALL ADJUSTMENT COVER.
DO NOT OVER TIGHTEN COVER SCREWS.
For set point adjustment and gapping, connect control to a calibrated
pressure source.
Types J120 (All) and J120K Models 455-559 (See Figure 4a)
Remove cover. Loosen phillips screw adjustment lock. Adjust set point
by turning 5/8” hex adjustment screw clockwise (IN) to raise set point,
or counterclockwise (OUT) to lower set point. Secure adjustment
screw by tightening adjustment lock.
Type J120K Models 36-39,147-S157B, & 367 (See Figure 4b)
R e m o v e f r o n t c o v e r a n d g a s k e t f r o m s e n s o r
assembly located below enclosure by unscrewing 4 phillips screws.
Loosen phillips screw adjustment lock. Adjust set point by turning 5/8”
hex screw clockwise (IN) to increase setting or counterclockwise (OUT)
to decrease setting. Adjusting screw should be locked by tightening
adjustment lock.
Types H121, H121K
Adjust set point by turning external knob and pointer to desired
setting on scale.
Types H122, H122K
Individual microswitches may be set together or separately by up
to 100% of range. The front (Low) microswitch should never be
set higher than the rear (High) microswitch. Turning external
knobs will increase or decrease each switch setting independently.
Types H122P
Individual switches may be set together or separately by up to 60%
of range. The front switch is set by turning the internal calibrating
screw to the right for lower set point and turning to the left for higher
set point. When not set together, the front switch should never be set
higher than the rear switch. Turning the external knob will increase or
decrease both switch settings simultaneously without disturbing their
relationship.
Controls with Options
Option 1519 and other models with an Adjustable Deadband
Switch
This microswitch has an integral adjustment wheel. Turning this
wheel raises and lowers the pressure rise set point. The fall set point
remains constant. Consult factory for additional information.
Type J120, Option 1530, Manual Reset
This microswitch, when actuated, remains actuated until the pressure
drops sufficiently to allow the reset knob (located on the left side of
the control) to be manually turned to reset the microswitch.
Option M210 Indicator for
Differential Pressure Controls, Span Adjustment
(See Figure 5). To adjust indication for maximum accuracy at any
desired set point, follow steps 1 thru 3 listed below:
1) Remove front window and gasket (four screws) to gain access
to span adjustment.
2) Connect control to calibrated gauges and set required differential
pressure.
3) Using a screwdriver, slowly turn the span adjustment to obtain
required indication. Remount the front gasket and window.
NOTE: Spanning adjustment will not affect the mid-range indication.
The adjustment is factory calibrated and sealed to indicate tampering.
DO NOT FORCE SPAN ADJUSTMENT, SINCE PERMANENT
DEFORMATION OF THE LINKAGE MECHANISM MAY RESULT.
Figure 5
Option M210
J120K: Opposed Sensor,
Models 36-39, 147-157, S147B,
S157B, 367
Figure 4bFigure 4a
DO NOT TURN

IMP120-14
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RE-GAPPING PROCEDURE
Tools Needed
5/8” Open End Wrench
3/16” Open End Wrench (2)
GAPPING IS FACTORY-SET AND CRITICAL TO THE FUNCTION
OF THE SWITCH. THIS PROCEDURE SHOULD ONLY BE
PERFORMED IF THE PLUNGER HAS ACCIDENTALLY BEEN
ADJUSTED.
1) Loosen adjustment lock.
2) Turn 5/8” hex adjustment screw IN, to approximately midrange.
This puts a load on the sensor and exposes the plunger flats.
(See Figure 6).
3) Using a 3/16” wrench on the plunger flats and a 3/16” wrench on
the plunger hex screw, turn hex OUT from plunger until micro-
switch actuates. If microswitch has already actuated, turn plunger
hex screw IN until microswitch deactuates.
4) Continue per following instructions, depending on model.
Models 171-174, 521-525, 531-535, and 540-548
Turn hex (IN) an additional 1-1/2 flats from this point. This will provide
a 5-9 mil gap.
Models 680, 701-705, 356-376, 612, 616, 270, 274
Turn hex (IN) 3 flats from this point (approximately 1/2 turn). This will
provide a 14-16 mil gap.
Models 183-189, 190-194, 483-489, 490-494,565-567
Turn hex (IN) 1 flat from this point. This will provide a 4-7 mil gap.
CONTACT FACTORY FOR ASSISTANCE WITH MODELS
NOT SHOWN ABOVE.
Re-Gapping Procedure for J120/J120K
Figure 6
zONE HAzARDOUS LOCATIONS FLAMEPROOF
GAP AND JOINT DETAILS
Activation Plunger to adjustment screw hole gap joints: 1.140” min.
length by 0.0030” max. annular gap
Activation Plunger to guide through hole gap joints: 1.105” min.
length by 0.0030” max. annular gap
Reset pivot to pivot guide through hole gap joints: 1.080” min.
length by 0.0040” max. annular gap
Adjustment shaft to shaft through hole gap joints: 1.060” min.
length by 0.0030” max. annular gap

IMP120-14
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Internal Set Point Adjustment
Types J120, J120K
External Set Point Adjustment
Types H121, H122, H121K, H122K, H122P
Models 126-164 Models S126B-S164B
Models 171-174 Models 188-194,
488-494
Models 183-186,
483-486
Pressure
Surface Mounting kit
6361-704
Types J120, J120K
Dimension A
Models Inches mm NPT
Pressure
126-164 7.25 184.2 1/4
S126B-S164B 7.63 193.8 1/2
171-174 8.72 221.5 1/2
183-186, 483-486 8.41 213.6 1/2
188-189, 488-489 7.47 189.7 1/2
190-194, 490-494 7.44 189.0 1/2
270-274 8.13 206.5 1/4
358-376 8.09 205.5 1/4
450, 452 8.81 223.8 1/4
451, 453, 454 8.06 204.7 1/4
520-525 9.25 235.0 1/2
530-535 8.84 224.5 1/2
550, 552 8.81 223.8 1/4
551, 553-555 8.34 211.8 1/4
560-564 7.53 191.3 2” Sanitary
565-567 7.53 191.3 1-1/2” Sanitary
612, 616 7.88 200.2 1/4
680 8.13 206.5 1/4
701-705, 15622,
15834-15839 7.44 189.0 1/4
Differential Pressure
36-39, 147-157, 367 7.59 192.8 1/4
S147B-S157B 7.59 192.8 1/2
455-457, 559 8.44 214.4 1/4
540-543 9.34 237.2 1/8
544-548 9.41 239.0 1/8
Types H121, H122, H121K, H122K, H122P
Dimension A
Models Inches mm NPT
Pressure
126-164 8.09 205.5 1/4
S126B-S164B 8.50 215.9 1/2
270-274 7.88 200.2 1/4
358-376 7.81 194.4 1/4
450, 452 9.69 246.1 1/4
453, 454 8.94 227.1 1/4
550, 552 9.75 247.7 1/4
553-555 9.31 236.5 1/4
612, 614, 15875 8.75 222.3 1/4
701-705 8.31 211.1 1/4
Differential Pressure
147-157 8.44 214.4 1/4
S147B-S157B 8.44 214.4 1/2
456-457, 559 9.31 236.5 1/4
Dimensions

IMP120-14
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Models 612-616, 701-705,
15622, 15834-15839, 15875
Models S147B & S157BModels 147 & 157
J120K Models 36-39
Models 530-535
Models 540-543
J120K Models 367 Models 455-457, 559
Models 544-548
Models 520-525
J120 Models
270-376, 680
H121/H122 Models
270-376
Models 450-454,
550-555
Differential Pressure
Models 560-564 Models 565-567
CP050910K
RECOMMENDED PRACTICES AND WARNINGS
United Electric Controls Company recommends careful consideration
of the following factors when specifying and installing UE pressure and
temperature units. Before installing a unit, the Installation and Maintenance
instructions provided with unit must be read and understood.
• Toavoid damagingunit,proof pressure andmaximumtemperature limits
stated in literature and on nameplates must never be exceeded, even by
surges in the system. Operation of the unit up to maximum pressure or
temperature is acceptable on a limited basis (e.g., start-up, testing) but
continuous operation must be restricted to the designated adjustable range.
Excessivecycling atmaximum pressureortemperature limitscould reduce
sensor life.
• Aback-upunitisnecessaryfor applicationswheredamagetoaprimary
unit could endanger life, limb or property. A high or low limit switch is
necessary for applications where a dangerous runaway condition could
result.
• The adjustable range must be selected so that incorrect, inadvertent or
malicious setting at any range point cannot result in an unsafe system
condition.
• Install unit where shock, vibration and ambient temperature fluctuations
will not damage unit or affect operation. Orient unit so that moisture does
not enter the enclosure via the electrical connection. When appropriate,
this entry point should be sealed to prevent moisture entry.
• Unit must not be altered or modified after shipment. Consult UE if
modification is necessary.
• Monitoroperation toobservewarning signsof possibledamage tounit,
suchasdriftinsetpointorfaultydisplay.Checkunitimmediately.
• Preventative maintenance and periodic testing is necessary for critical
applications where damage could endanger property or personnel.
• Forallapplications,afactorysetunitshouldbetestedbeforeuse.
• Electrical ratings stated in literature and on nameplate must not be
exceeded.Overloadonaswitchcancausedamage,evenonthefirstcycle.
Wire unit according to local and national electrical codes, using wire size
recommended in installation sheet.
• Donotmountunitinambienttemp.exceedingpublishedlimits.
LIMITED WARRANTY
Seller warrants that the product hereby purchased is, upon delivery, free from
defectsinmaterialandworkmanshipandthatanysuchproductwhichisfound
tobedefectiveinsuchworkmanshipormaterialwillberepairedorreplacedby
Seller (Ex-works, Factory, Watertown, Massachusetts. INCOTERMS); provided,
however, that this warranty applies only to equipment found to be so defective
within a period of 24 months from the date of manufacture by the Seller (36
monthsfortheSpectra12andOneSeriesproducts;18monthsforTemperature
Sensors). Seller shall not be obligated under this warranty for alleged defects
which examination discloses are due to tampering, misuse, neglect, improper
storage, and in any case where products are disassembled by anyone other
thanauthorizedSeller’srepresentatives.EXCEPTFORTHELIMITED WARRANTY
OF REPAIR AND REPLACEMENT STATED ABOVE, SELLER DISCLAIMS ALL
WARRANTIES WHATSOEVER WITH RESPECT TO THE PRODUCT, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULARPURPOSE.
LIMITATION OF SELLER’S LIAbILITY
Seller’s liability to Buyer for any loss or claim, including liability incurred in
connection with (i) breach of any warranty whatsoever, expressed or implied,
(ii) a breach of contract, (iii) a negligent act or acts (or negligent failure to
act) committed by Seller, or (iv) an act for which strict liability will be inputted
to seller, is limited to the “limited warranty” of repair and/or replacement as
so stated in our warranty of product. In no event shall the Seller be liable for
any special, indirect, consequential or other damages of a like general nature,
including,withoutlimitation,lossofprofitsorproduction,orlossorexpensesof
any nature incurred by the buyer or any third party.
UE specifications subject to change without notice.
180 Dexter Avenue, P.O. Box 9143
Watertown, MA 02471-9143 USA
Telephone: [phone] Fax: [phone]
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