UE 120 Series J120-612 Pressure and Temperature Switch

The J120-612 is a heavy-duty explosion-proof pressure switch from UE’s renowned 120 Series, purpose-built for high-pressure monitoring and safety interlock control in hazardous industrial environments. It adopts a piston-type pressure sensing structure with internal setpoint adjustment, delivering reliable mechanical switching output for overpressure protection, pump/compressor control, and process alarm triggering. Certified for global explosive atmosphere standards, it is widely adopted in oil & gas, petrochemical, power, and heavy machinery industries where robust high-pressure monitoring is mandatory.

• Adjustable setpoint range: 125 ~ 3000 psi (8.6 ~ 206.8 bar)
• Adjustable deadband: 40 ~ 250 psi (2.8 ~ 17.2 bar)
• Maximum proof pressure: 6000 psi (413.7 bar)
• Burst pressure rating: 10000 psi (689.5 bar)
• Sensing mechanism: 303 stainless steel piston with Buna-N sealing (standard wetted parts)
• Process connection: 1/4" NPT female thread

• Housing: Epoxy powder-coated die-cast aluminum, NEMA 4X, IP66 rated
• Hazardous location rating: Class I Div.1/2, Class II Div.1/2; Ex d IIC T6 explosion-proof
• Electrical entries: Dual 3/4" NPT conduit ports with built-in terminal block for easy wiring
• Adjustment method: Internal hex screw setpoint adjustment with lockable cover to prevent tampering
• Vibration & shock resistance: Maintains stable setpoint under 2.5 G (5–500 Hz vibration) and 15 G shock load
• Operating ambient temperature: -40°C ~ +75°C

• 15 A resistive / 2 A inductive at 125/250/480 VAC
• 2 A resistive / 1 A inductive at 24–30 VDC
• Switch configuration: Single SPDT contact (NO/NC reversible wiring)
• Optional upgrades: DPDT dual switch, hermetically sealed switch contacts

cULus, ATEX, IECEx, CE; SIL 2 certified (SIL 3 capable) for functional safety systemsKele

1. High-pressure piston design for heavy industrial media

   The 303 stainless steel piston sensor withstands extreme system pressure up to 6000 psi proof and 10000 psi burst pressure, perfectly suited for hydraulic, steam, high-pressure gas and heavy process fluid monitoring, far exceeding the pressure limit of diaphragm-type switches.

2. Full explosion-proof & hazardous location compliance

   Class I Division 1 explosion-proof housing eliminates ignition risks in flammable gas, vapor and dust environments; global ATEX/IECEx/cULus approvals enable universal deployment in international refineries, chemical plants and offshore facilities.

3. Tamper-proof internal adjustment with lockable cover

   Internal setpoint tuning paired with a lockable enclosure cover avoids unauthorized parameter modification on-site, ensuring consistent safety thresholds for long-term unattended operation.

4. Robust all-weather enclosure with dual wiring ports

   Epoxy-coated cast aluminum housing achieves NEMA 4X / IP66 protection against rain, dust, oil mist and corrosive workshop atmosphere. Two separate 3/4" NPT conduit openings simplify wiring layout without extra junction boxes.

5. Wide tunable deadband for flexible control logic

   40–250 psi fully adjustable deadband allows engineers to customize switch on/off hysteresis, preventing frequent chattering of pumps, compressors and safety valves under fluctuating pressure loads.

6. SIL 2 functional safety qualification

   Validated for safety instrumented systems (SIS), it meets strict industrial safety standards for emergency shutdown (ESD) and overpressure protection loops, reducing operational risk and compliance audit costs.

7. Long service life with minimal maintenance

   All-metal piston sensing assembly resists abrasion from media containing fine particles; sealed contact module eliminates dust contamination, supporting years of 24/7 continuous operation with only periodic calibration.

• High-pressure hydraulic system overpressure safety interlock
• Oil & gas pipeline pressure monitoring and emergency shutdown
• Petrochemical reactor, steam boiler and compressor protection
• Power plant turbine, feedwater and high-pressure loop alarming
• Heavy machinery, hydraulic press and mining equipment pressure control
• Refinery, chemical plant SIS safety instrumented systems
• Offshore platform and flammable process area pressure alarm