United Electric Controls Pressure Switches & Transmitters

United Electric Controls Co. (universally recognized across heavy industry as UE or UE Controls) established its manufacturing foundation in 1931 in Watertown, Massachusetts, USA. Beginning with precision temperature regulators for early industrial heating apparatus, more than nine decades of continuous engineering excellence propelled the company into an internationally acclaimed technology pioneer in hazardous-area electromechanical switching, critical process safety systems, electronic transmitters, and wireless environmental monitoring.

Series 120 Explosion-Proof Pressure and Differential Pressure Switches (J120, H120, J120K)

The premier explosion-proof Series 120 electromechanical pressure and differential pressure switches from United Electric Controls are engineered for critical safety shutdown and alarm applications in severe hazardous locations across oil refineries, offshore drilling platforms, chemical processing

plants, and power utility stations.

Certified to Class I Div 1 & 2, ATEX, and IECEx standards for flameproof Ex d containment, Series 120 features single-switch J120 models, dual-switch H120 units with independent setpoint adjustment, and J120K differential pressure models with hydrostatic proof pressure up to 689 bar.

Adjustable setpoint spans from vacuum (-1 bar) up to 413 bar: precision internal or external adjustment scale
High proof pressure ratings up to 689 bar: robust sensor diaphragm construction prevents catastrophic rupture
Wetted metallurgy options: 316L stainless steel, Hastelloy C, Monel, and resilient elastomer diaphragms
Explosion-proof hazardous ratings: Class I Div 1 & 2, Zone 1 ATEX/IECEx dual-compartment epoxy coated enclosure

Series 100 and Series 117 Compact Weatherproof Pressure and Vacuum Switches NEMA 4X

United Electric Controls Series 100 and Series 117 compact electromechanical pressure, vacuum, and temperature switches provide rugged, cost-effective monitoring for industrial process machinery, rotating turbines, reciprocating gas compressors, and lubrication systems.

Housed in robust NEMA 4X / IP66 epoxy-coated die-cast aluminum enclosures, Series 100 models (J100, B100, E100) feature accessible setpoint adjustments under a protective cover, while Series 117 units are certified for Class I Div 2 / Zone 2 hazardous areas across compact process skids.

Operating pressure spans from vacuum (-1 bar) up to 345 bar: high-sensitivity diaphragm or welded metal bellows
Heavy-duty NEMA 4X / IP66 enclosure: marine-grade epoxy coated cast aluminum resists aggressive atmospheric salt spray
High-capacity SPDT microswitches: rated up to 15 A at 125/250 VAC for direct inductive load interlock control
Series 117 Class I Div 2 compliance: optimized for compact offshore wellhead skids and mobile pump trailers

Series 400 Multi-Switch Pressure and Temperature Controls (Up to 3 SPDT Outputs)

United Electric Controls Series 400 multi-output pressure, differential pressure, and temperature switches offer a versatile mechanical architecture incorporating one, two, or three independently adjustable SPDT microswitches within a single rugged NEMA 4X enclosure.

Models J400, J402, B400, and H400 eliminate the need for redundant process taps, providing staging, warning pre-alarm, and emergency shutdown logic in one unit. Calibrated reference dials allow field technicians to dial in setpoints quickly without external test pressure gauges.

One, two, or three independent SPDT microswitches: staged alarm signaling and emergency trip logic in a single housing
Calibrated reference dials: highly visible individual scales streamline setpoint adjustments during commissioning
Broad measurement spans up to 413 bar pressure and -115 to +340 deg C temperature: covers critical plant thermal loops
Heavy-duty NEMA 4X housing: tamper-resistant locked cover protects sensitive setpoints from unauthorized manipulation

One Series Electronic Pressure and Temperature Safety Transmitters with SIL 2/3 Certification

The groundbreaking One Series electronic pressure and temperature safety transmitters from United Electric Controls (including 1X and One Series Safety Transmitter lines) are specifically designed to upgrade aging mechanical switches within Emergency Shutdown (ESD) and Safety Instrumented Systems

(SIS). Certified IEC 61508 compliant for SIL 2 applications (SIL 3 capable in redundant architectures), these units integrate solid-state relay switching with reaction times under 100 ms, 4-20 mA HART output, high-visibility digital display, and automated sensor self-diagnostics.

IEC 61508 SIL 2 certified and SIL 3 capable: trusted field sensor for safety instrumented protection loops
High-speed solid-state switching response under 100 ms: rapid trip execution protects rotating machinery and boilers
4-20 mA analog output with HART 7 protocol: continuous process telemetry, diagnostic alerts, and remote tuning
Patented IAW (I Am Working) self-diagnostics: continuous internal health checks eliminate undetected dormant failures

Series 24 Delta-Pro and Series 120K Differential Pressure Switches for Filter Monitoring

United Electric Controls Series 24 Delta-Pro and Series 120K differential pressure switches provide precision monitoring of differential head loss across liquid and gas particulate filters, coalescers, plate heat exchangers, and orifice flow loops.

The compact Delta-Pro Series 24 features a balanced elastomeric diaphragm engineered to withstand full line overpressure on either port without calibration shift, while heavy-duty explosion-proof Series 120K switches handle static system pressures up to 689 bar in severe petrochemical refinery

processes.

Differential setpoint ranges from 12 mbar to 35 bar: highly sensitive detection of filter clogging thresholds
Bi-directional full overpressure protection: diaphragm structure resists catastrophic reverse pressure pulses
Series 120K high static pressure rating up to 689 bar: Class I Div 1/2 and ATEX flameproof construction
Standard process connections 1/4 NPT and 1/2 NPT: mounts directly onto three-valve instrument manifolds

Series 800 Indicating Temperature Controls and Series 120 (E121) Explosion-Proof Thermostats

United Electric Controls Series 800 indicating temperature switches and Series 120 explosion-proof temperature controls (models B121, E121, C120) provide reliable thermal interlock protection for process immersion tanks, heat exchangers, industrial furnaces, and chemical distillation vessels.

Series 800 features an intuitive front-panel dial thermometer displaying both actual fluid temperature and adjustable setpoint thresholds. Available with rigid thermal immersion stems or flexible armored stainless steel capillaries up to 7.6 meters, they adapt to challenging mechanical layouts.

Temperature spans from -115 to +340 deg C: engineered for deep cryogenic chillers and high-temperature oil heaters
Dual-pointer dial indication on Series 800: simultaneous visual tracking of current process temperature and trip threshold
Flexible capillary armor up to 7.6 meters: enables remote wall mounting away from vibrating process vessels
Explosion-proof E121 and B121 models: Class I Div 1/2 ATEX certified for direct installation on fuel gas preheaters

Vanguard WirelessHART Fixed Toxic and Combustible Gas Detectors for Remote Monitoring

United Electric Controls Vanguard WirelessHART fixed gas detectors represent a breakthrough in remote environmental gas leak detection across sprawling tank farms, wellheads, and refinery peripheries.

Eliminating up to 90% of costly signal cabling, conduit infrastructure, and civil trenching, Vanguard communicates seamlessly over mesh WirelessHART networks (IEC 62591).

Modular hot-swappable digital sensor cartridges detect toxic hydrogen sulfide (H2S), carbon monoxide (CO), and combustible hydrocarbons, backed by up to five years of continuous battery life.

WirelessHART industrial protocol (IEC 62591): interoperates with existing standard plant wireless field gateways
Reduces installation capital expenditure up to 90%: eliminates expensive trenching and hazardous wiring conduits
Field-replaceable heavy-duty battery pack: delivers up to 5 years of continuous remote gas sniffing operation
Intelligent pre-calibrated sensor cartridges: hot-swappable in Class I Div 1 hazardous areas without declassification

AST (Applied Sensor Technologies) Industrial Temperature Sensors and Thermocouples

Applied Sensor Technologies (AST), a dedicated instrumentation division of United Electric Controls, manufactures a comprehensive array of heavy-duty industrial RTD resistance temperature detectors (Pt100, Pt1000) and thermocouples (Types K, J, T, E, N, S, R) engineered with solid-bar drilled

thermowells machined from 316 stainless steel, Inconel, and Hastelloy alloys. Operating across extreme temperature extremes from -200 up to +1300 deg C, AST assemblies withstand thermal shock, severe fluid drag, and mechanical vibration in cracking furnaces and steam turbines.

Operating temperature capabilities from -200 to +1300 deg C: engineered for cryogenic liquids and metal smelting
Precision RTD sensors in Class A and Class AA accuracy: tight tolerance repeatability for pharmaceutical batch reactors
Mineral Insulated Metal Sheathed (MIMS) thermocouples: exceptional vibration immunity and field bendable construction
Solid-bar drilled thermowells: ASME PTC 19.3 stress calculated for extreme high-velocity process flow lines

Engineering Heritage of United Electric Controls (American Process Safety Since 1931)

United Electric Controls Co. (universally recognized across heavy industry as UE or UE Controls) established its manufacturing foundation in 1931 in Watertown, Massachusetts, USA.

Beginning with precision temperature regulators for early industrial heating apparatus, more than nine decades of continuous engineering excellence propelled the company into an internationally acclaimed technology pioneer in hazardous-area electromechanical switching, critical process safety

systems, electronic transmitters, and wireless environmental monitoring.

Headquartered with modern development and manufacturing facilities in Watertown, United Electric Controls operates under a certified ISO 9001:2015 quality management framework.

Every instrument undergoes automated hydrostatic proof pressure testing, mechanical cycling validation, and environmental burn-in.

UE instrumentation carries global safety and hazardous location certifications including Class I Division 1 and 2 (UL / CSA), European ATEX, international IECEx, and IEC 61508 functional safety accreditation up to SIL 2 and SIL 3 levels.

Explosion-Proof Design of Series 120 and J120K Differential Pressure Switches

The premier electromechanical Series 120 (models J120, H120, B121, E121) from United Electric Controls represents a global benchmark for safety shutdown across petrochemical refineries, offshore drilling rigs, offshore FPSOs, and gas transport compressor terminals.

Built inside an explosion-proof cast aluminum enclosure with heavy-duty epoxy coating, the design is certified Class I Div 1/2 and ATEX Ex d.

High-integrity sensor diaphragms fabricated from 316L stainless steel, Monel, or Hastelloy C withstand severe hydrostatic overpressure surges up to 689 bar without rupture.

For monitoring differential head loss across particulate filters, coalescers, and heat exchangers, the specialized Series J120K differential pressure switch delivers unmatched resilience.

Engineered with balanced dual-opposed sensing chambers, the internal mechanical stop prevents diaphragm damage when exposed to accidental full-line unilateral overpressure, ensuring repeatable microswitch actuation within one percent of span repeatability.

One Series Intelligent Safety Transmitters and SIL 2/3 Emergency Shutdown Certification

The groundbreaking One Series family (featuring 1X and One Series Safety Transmitter lines) from United Electric Controls is engineered to modernize outdated mechanical switches in Safety Instrumented Systems (SIS) and Emergency Shutdown (ESD) architectures.

Uniting a fast solid-state electronic switch (reaction time under 100 milliseconds), a 4-20 mA analog transmitter output with HART 7 protocol, local digital display, and continuous internal diagnostics, One Series provides unprecedented plant protection.

Certified to IEC 61508 for SIL 2 applications (and SIL 3 in 1oo2 voting redundant systems), the instrument features patented IAW (I Am Working) self-diagnostics. The microcontroller continuously interrogates sensor bridge health, internal circuitry, and firmware integrity.

Upon detecting a dormant fault, the device immediately transitions the switch output into a predefined safe state, preventing unannounced system failures.

Series 400 Multi-Switch Architecture and Vanguard WirelessHART Gas Detection

United Electric Controls Series 400 electromechanical switches provide an engineered solution for multi-stage process control.

By housing one, two, or three independently adjustable SPDT microswitches within a single rugged NEMA 4X enclosure, Series 400 allows plant operators to stage early warning alarms, secondary interlocks, and emergency trip thresholds from a single process tap without redundant pipe drilling.

Expanding into wireless industrial plant safety, United Electric Controls developed the Vanguard WirelessHART fixed gas detector line. Operating on the IEC 62591 mesh wireless standard, Vanguard eliminates up to ninety percent of costly signal wiring, trenching, and rigid conduit installation.

Modular hot-swappable digital sensor cartridges detect toxic hydrogen sulfide (H2S), carbon monoxide (CO), and combustible hydrocarbons, powered by a heavy-duty battery pack delivering up to five years of maintenance-free operation.

Turnkey International B2B Export Supply of Authentic United Electric Controls Instrumentation

Equipguo provides comprehensive B2B export supply of genuine United Electric Controls Series 120, Series 100, Series 400 pressure switches, One Series SIL 2/3 safety transmitters, Delta-Pro differential switches, and Applied Sensor Technologies (AST) temperature sensors to engineering contractors,

petroleum refineries, and industrial machinery builders worldwide.

Our dedicated instrumentation engineers verify process connections (1/4 NPT, 1/2 NPT), wetted material compatibility (316L SS, Hastelloy, Monel), switch electrical ratings, and SIL safety documentation against authentic manufacturer technical files.

We provide flexible international commercial terms, reinforced seaworthy packaging, and expedited worldwide air and maritime cargo delivery.