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Furnace Pressure Switches

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Designed to actuate by changes in the pressure of a liquid or gas, furnace pressure switches are programmed to activate at certain pressure points, and may be designed to make contact either on pressure rise or on pressure fall. Read More…

Furnace Pressure Switches A furnace pressure switch is an interlock device that senses changes in hydraulic or pneumatic input pressure and responds by making electrical contact, switching on or off.
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Leading Manufacturers

Mentor, OH  |  440-205-7600

Tecmark is a designer and manufacturer of remotely actuated controls used by OEMs worldwide. We offer an extensive line of high pressure switches, and our customer service representatives will help you find the perfect model for your application. Whether you are looking for an in-house solution, or an industry need, we continue to develop technological advancements.

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Tecmark Corporation $$$

Lenexa, KS  |  800-676-6794

SOR® manufactures a full line of pressure, differential pressure, temperature, vacuum and level switches that are certified fit for use in SIL (Safety Integrity Level) environments. We are one of only a few manufacturers to offer its entire range of switches certified to the IEC 61508 standard.

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SOR Inc. $$$

Boca Raton, FL  |  800-473-7313

For over eighty years, SUCO Technologies has been supplying customers with high quality Mechanical Pressure Switches, Vacuum Switches and Electronic Pressure Switches. Our products are designed to handle different situations and are useful in applications such as Filters, Generators, Off-Road Equipment, Compressors, Turbines, Water Applications and more. Call SUCO today for assistance with your next project.

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SUCO Technologies, Inc. $$$

Sterling Heights, MI  |  800-648-5778

Mid-West Instrument complies with the requirements of CSA B51-09. We have differential pressure gauges, flow measurement products, switches and accessories. In 1958 we began with producing leak testing instruments and have since introduced low differential and high working pressure gauges as well as pneumatic and hydraulic test and burst equipment.

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Mid-West Instrument $$$

Attleboro, MA  |  508-236-3800

Sensata Technologies (formerly Texas Instruments) is a manufacturer of pressure switches—used in automobiles (air conditioner, engine oil, power steering, transmission), HVAC/R and industrial applications

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Sensata Technologies, Inc. $$$
placeholder image Tecmark Corporation SOR Inc. SUCO Technologies, Inc. Mid-West Instrument Sensata Technologies, Inc.

Furnace pressure switches are produced by pressure switch manufacturers to operate in furnaces as safety devices through offering control stability through inconsistent conditions and assuring continuous service under extreme shock and vibration. They typically work with gas or liquid pressure situations, individually or in a combination.

Common industries that utilize furnace pressure switches include pulp and paper residential, industrial, food processing, heating and cooling, electronics, foundry. Furnace pressure switches are used for applications such as residential boilers or furnaces, waste oil heating systems, small air compressors, electric or gas heaters, pumps, food processing equipment and electric strip heaters in VAV systems.

Furnace pressure switches typically consist of an elastomeric diaphragm, insulators and field adjustable pressure set points. When a furnace pressure switch is actuated an elastomeric diaphragm moves and opens or closes an electrical circuit that interrupts or continues the flow involved. An elastomeric diaphragm eliminates the need for an oil barrier because they separate pressure instruments from the process media, while allowing the instruments to sense the process pressure.

The insulators are designed as a protective barrier against direct exposure to live parts. A furnace pressure switch is set to a certain point of pressure to which it will automatically respond. Field adjustable pressure set points allow the furnace pressure switch to be calibrated to the correct pressure points for opening and closing the diaphragm. There are three main types of furnace pressure switches: air pressure switches, water pressure switches and fuel pressure switches.

An air pressure switch ensures that there is enough fresh air circulated through the furnace. A water pressure switch is used in furnaces that heat water and protect the water heater tank from burns. A fuel pressure switch monitors the pump's ability to produce enough pressure for the liquid fuel oil to be squeezed into a fine mist through a nozzle for full combustion.

Furnace Pressure Switches Informational Video