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Have a live application? Use our United Electric Product Overview and Quick Selection Guide to configure the model and options for your requirement:

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ABLE are United Electric’s Exclusive Representative for Sales and Service in the UK and Ireland and can assist you and your customers in the following areas:

  • Application expertise
  • Our factory trained engineers offer after sales support, service and maintenance (contracts available)
  • Offer advanced United Electric pressure / temperature switch product training, either in-person or via video call.

Further to the above, ABLE can offer custom solutions based on your individual requirements. Email us now at [email protected]

United Electric 120 Series Explosion Proof Pressure / Temperature Switch

ABLE Instruments are United Electric’s Exclusive Representative for Sales and Service in the UK and Ireland, including the UE 120 Series range which offers a variety of pressure, vacuum, differential pressure and temperature ranges, as well as process connections, wetted materials and sensor types.

Explosion-proof SPDT/DPDT and multi-switch output for control and safety applications:

Designed to protect equipment and personnel involved in heavy industrial processes whilst preserving process uptime, the UE 120 Series is simple to install in hazardous locations and can provide critical alarm, safety and emergency shutdown functions. As an electromechanical switch, it can safely operate independently of the control system and switch reliably when needed, free from potential communication errors or cyber concerns. Typical applications that utilise the United Electric 120 Series include rotating equipment such as pumps, turbines, and compressors, heat tracing, combustion systems, and oil, gas and chemical processing.


  • Worldwide certifications and approvals
  • Certified for use in SIL2 functional safety systems. SIL3 capable
  • NACE MR0175 compliant models
  • Multiple outputs
  • Easy installation via dual electrical conduit opening
  • Wide range of available sensors to match all process requirements
  • Improve measurement accuracy at ultra-low pressure ranges
  • Protect piping and vessels with heat trace/freeze protection temperature models

Have a particular application / project in mind? We’d welcome a call on +44 (0) 1189 169 420, or email us now at [email protected]

As safety requirements become more stringent, the determining factor in specifying an industrial pressure, differential pressure and/ or temperature switch rests upon that switch meeting hazardous location requirements and worldwide approvals and certifications.  Fulfilling this criteria, UE’s 120 Series is the international choice where potentially explosive or highly corrosive atmospheres exist.

The United Electric 120 Series offers a variety of pressure, vacuum, differential pressure and temperature ranges, as well as process connections, wetted materials and sensor types. With a common flexible platform, models can quickly be adapted at the factory for special requirements, such as ranges, process connections and electrical ratings. Typical industries using UE 120 Series switches include chemical, petrochemical, refinery and oil & gas production and transmission.

120 Series Specifications:

Storage Temperature
-65 to 160°F (-54 to 71°C)
Ambient Temperature Limits
-58 to 160°F (-50 to 71°C); models 36-39, 520-525, 540-548, 701-705, 15834-15839: 0 to 160°F (-17 to 71°C); types 820E, 822E: -40 to 160°F (-40 to 71°C) set point typically shifts less than 1% of range for a 50°F (28°C) ambient temperature change; less than 2% for types E121& E122
Set Point Repeatability
Temperature models:
Type B, C and F: ±1% of full scale range
Type E: ±2% of full scale range
Pressure models:
126-164, S126B-S164B, 171-174, 270-274, 358-376, 520-535, 540- 543, 701-705, 15622, 15834,-15839: ±1% of full scale range
Models 450- 457, 550-559: ±1/2% of full scale range
Models 36-39, 183-194, 483-494, 544-548, 565-567, 612-680, 15875: ±1-1/2% of full scale range
Set point repeats after 15 G, 10 millisecond duration
Set point repeats after 2.5 G, 5-500 Hz
Die cast aluminium, epoxy powder coated; gasketed; cover lock; internal set point lock standard on types J, C, F; gasketed stainless steel tamper-resistant dial cover on types B, H, E; aluminium nameplate
Enclosure Classification
Certified to enclosure type 4X. Class I, Division 1 product meets enclosure type 7; Class II, Division 1 product meets enclosure type 9. Certified to IP66 requirements
Switch Output
One or two SPDT; dual switch may be separated up to 100% of range; except type 822E where switch #2 can be set up to 25% of range span below switch #1 setpoint; switches may be wired “normally open” or “normally closed”
Electrical Rating*
15A 125/250/480 VAC resistive (standard), 2A @ 30 VDC, 1A @ 48 VDC, 0.5A @ 125 VDC; except types J120-15622, 15834-15839, H121-15875: 20A 125/250/480 VAC resistive, 6A @ 30 VDC, 0.5A @ 125 VDC, 0.25A @ 250 VDC; except types B121-13272, B122-13322, E121-13273, E122-13321: 22A 480 VAC resistive, 2A @ 30 VDC, 1A @ 48 VDC, 0.4A @ 125 VDC.
Reference Scales
Types B, E & H: external dial. Scale divisions vary with range (see model charts)
3-8 lbs. Varies with type and model
Electrical Connection
Type H, B, E; one 3/4″ NPT E/C; type J, C, F, 820E, 822E; two 3/4″ NPT E/C; terminal block standard
Pressure Connection
Models S126B-S164B, 171-194, 483-494, 520-535: 1/2″ NPT (female)
Models 565-567: 1-1 ⁄ 2″ flush mount connection
Models 540-548: 1/8″ NPT (female)
All others: 1/4″ NPT (female)
Temperature Assembly
Bulb and capillary: 6 feet 304 stainless steel (standard) except for E121-13273 and E122-13321: 10 feet; Fill: Non-toxic oil filled
Immersion stem: Nickel-plated brass (standard) except for B121-13272 and B122-13322: stainless steel
Temperature Deadband
Type F120, 820E, 822E: typically 1%; type B-, C-, and E- 121 and 122: typically 2% of range under laboratory conditions (70°F [21°C] ambient circulating bath at rate of 1/2°F per minute change)
Pressure Deadband
See individual model charts on pages 6-14 of datasheet. Consult ABLE for deadbands on switch options
Differential Pressure Indicator (OPTION M10)
Differential pressure indication available types H121K and H122K with option M210 (check model availability under options); accuracy approximately 1% mid 50% of range, 3% at ends; window is plexiglass and gasketed; indicator may be field adjusted for approximately ±1% accuracy at any set point within range
Temperature Indication
Temperature indication available types 820E and 822E. Indication accuracy is ±1% of adjustable range
DC Ratings are based on experience – Consult UE for further information. VDC ratings are not listed on nameplates.
United States / Canada
Class I, Division 1 and 2, Groups B, C & D
Class II, Division 1 and 2, Groups E, F & G
Class III
Class I, Zone 1, Group IIB + H2 T6
Enclosure Type 4X
UL Listed, cUL Certified
Pressure: UL 50 & 1203; CSA C22.2
No. 25 & 30 – File # E40857
Temperature: UL 50 & 1203; CSA C22.2
No. 25 & 30 – File # E43374
ATEX Directive (94/9/EC)
II 2 G Ex d IIC T6 Gb
II 2 D Ex tb IIIC T85°C Db IP66
Tamb = -40°C to +75°C
UL International DEMKO A/S (N.B.# 0539)
Certificate # DEMKO 09 ATEX 0815573X Rev. 2
EN 60079-0, 60079-1, 60079-31
II 1 G Ex ia IIC T6 Ga (OPTIONAL – code M405) (not available types 820E, 822E)
Tamb = -50°C to +60°C
UL International DEMKO A/S (N.B.# 0539)
Certificate # DEMKO 11 ATEX 1105261 Rev. 0
EN 60079-0, 60079-11, 60079-26
Pressure Equipment Directive (PED) (97/23/EC)
Compliant to PED
Products rated lower than 7.5 psi are outside the scope of the PED
Low Voltage Directive (LVD) (2006/95/EC)
UEC compliant to LVD
Products rated lower than 50 VAC and 75 VDC are outside of the scope of the LVD
The Low Voltage Directive does not apply to products for use in hazardous locations
RU C-US.ГБ05.B.01185
NANIO CCVE Certification Center
Type 120, 121 and 122
0Ex ia IIC T6 Ga X
Tamb = -50°C to +60°C
60079-0-2011,ГOCT 31610.26 / IEC 60079- 26
Type 120, 121, 122, 820 & 822
1Ex d IIC T6 Gb X
Tamb = -50°C to +80°C (models 120, 121 & 122)
Tamb = -40°C to +75°C (models 820 & 822)
ГOCT P MЭК IEC 60079-1, ГOCT P MЭК 60079-0

Gosnadzorohrantruda Permit (OPTIONAL – code M404)

Tamb = -56°C to +85°C (types 120, 121 & 122)
Tamb = -40°C to +71°C (types 820 & 822)
ГOCT, ГOCT 22782.0, ГOCT 22782.6
CQST Certified (OPTIONAL – code M408)
(120,121,122) Pressure: CNEx15.2540X
(120,121,122,820,822) Temperature: CNEx15.2541X
Ex d IIC T6 Gb
Ex tD A21 T+85°C IP66
Tamb. = -40°C to +75°C
GB3836.1,GB3836.2 & GB12476.
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