PRESSURE SWITCH H100-190 United Electric, USA

Overview

The United Electric H100-190 pressure switch is a low-range industrial unit engineered for reliable operation in services where system over-pressure events are common. Covering an adjustable set point range of 5 to 30 psi, it combines sensitive low-range detection with an outstanding proof pressure of 2500 psi.

Built in the USA by United Electric Controls, the H100-190 is a robust choice for low-pressure alarm, shutdown, and control duties on gas systems, tank blanketing, and process lines where impulse lines can see severe pressure transients.

Engineering & Design

The switch uses a diaphragm piston sensing element with a precision snap-action switch to ensure repeatable set point operation and a clean contact transfer. The 0.70 inch orifice provides reliable response in low-pressure services while the massive proof pressure rating protects the mechanism during commissioning and system upsets.

The Type 4X die-cast aluminium enclosure is epoxy powder coated, gasketed, and fitted with captive cover screws for weatherproof and corrosion-resistant installation. The 1/2 inch NPT female process connection with 316 stainless steel wetted parts suits standard piping, and the 15A electrical rating handles industrial control circuits directly.

Key Features

• Adjustable set point range 5 to 30 psi
• Dead band 1 to 6 psi
• Exceptional proof pressure 2500 psi
• Max over range pressure 1500 psi
• 316 stainless steel wetted parts
• 1/2 inch NPT female pressure connection with 0.70 inch orifice
• Type 4X certified die-cast aluminium enclosure
• 15A @ 125/250/480 VAC resistive electrical rating
• Ambient temperature -40°C to 71°C

Applications

• Low-pressure alarm and shutdown on gas systems
• Tank blanketing and pad pressure control
• Fuel gas low-pressure protection
• Filter differential pressure monitoring
• Instrument air system alarms
• Process lines with severe pressure transients

Specifications

Services where pressure transients are a fact of life demand instruments with structural margin, and the United Electric H100-190 pressure switch offers a proof pressure of 2500 psi against a 5 to 30 psi set point range. This combination makes the H100-190 an excellent choice for gas systems and blanketing services where impulse lines can be exposed to severe over-pressure events.

Where pressure transients threaten low-range instruments, the United Electric H100-190 pressure switch provides the margin, and Seven Star LLC supplies the United Electric H100-190 pressure switch for gas and blanketing services.

The United Electric H100-190 pressure switch is adjusted to the trip point of the protective loop and is wired into the relay logic of the control panel. The internal switch element is rated for the 120 V AC control circuits, and the terminal strip is accessed through the cover without removing the switch from the line. The SPDT contact configuration allows the normally open and the normally closed wiring of the alarm or the shutdown function.

Why Seven Star LLC

Seven Star LLC supplies the United Electric H100-190 pressure switch with complete documentation, supporting both new projects and maintenance spares. Our team verifies set point ranges and electrical configurations to ensure the right switch for your application.

We serve oil and gas, power, and general industrial customers across Oman and the GCC with responsive B2B service and dependable after-sales support.

Robust Design

The 0.70 inch orifice and 316 stainless steel wetted parts are specified to handle the flow and compatibility requirements of low-pressure gas service, while the diaphragm piston element absorbs transient loads without shifting the set point. The Type 4X enclosure provides complete weather protection for outdoor installations.

With a dead band of 1 to 6 psi, the switch responds promptly to small pressure excursions while remaining stable in services with normal pressure ripple.

Identifying and Specifying the H100-190

United Electric H100 switches are ordered by model number, and the suffix shows the range and sensing configuration. For a like-for-like replacement, read the complete model number from the nameplate on the enclosure and confirm the set point range (5 to 30 psi for this model), the 1/2 inch NPT process connection and the electrical rating. If the application has changed since the original installation, check that the new set point sits comfortably inside the adjustable range rather than at either end.

Installation Best Practice

• Mount the switch on a vibration-free support and connect it through an isolation valve so it can be tested and replaced without shutting the line down.
• On gas services, slope impulse lines so condensate drains away from the switch. On liquid services, vent trapped air so that low set points are not affected by gas pockets.
• Where pressure pulsation is strong, for example near reciprocating compressors or pumps, fit a snubber to reduce contact chatter and wear.
• Use suitable cable glands and keep the cover gasket and captive screws in good condition to maintain the Type 4X enclosure rating.

Setting and Testing the Set Point

Adjust the set point with a calibrated pressure source connected through a test tee, raising and lowering the pressure slowly so both the trip and reset points can be recorded. The difference between them is the dead band. On this United Electric H100-190 pressure switch the dead band falls within the 1 to 6 psi range stated in the specifications. Record the as-found and as-left values on the calibration sheet for audit and trending.

Maintenance and Troubleshooting

Include the switch in the periodic function-test programme for the protection loop it serves. If the switch no longer trips at the set value, check for a blocked impulse line or isolation valve before adjusting it. If contacts chatter, look for pulsation or a set point very close to normal operating pressure. Inspect the enclosure for moisture inside, especially at coastal sites.

Applications in Oman and the GCC

Low-range switches with high proof pressure suit fuel gas skids, tank blanketing systems, flare and purge lines and utility air services at plants throughout Oman and the GCC. Seven Star LLC supplies United Electric switches for these duties and can match replacement units to the existing model code.

Request a Quote for PRESSURE SWITCH H100-190 United Electric, USA

For the United Electric H100-190 pressure switch, H100 series switch or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your network, interface and power requirements, and our specialists will respond with a detailed commercial proposal and the official United documentation.

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