Tecmark Corp.'s 3000 series pressure switches convert a pressure signal to an electrical output. In response to a change in pressure, movement of an elastomeric diaphragm opens or closes an electrical circuit based on a predetermined pressure set point. The Series 3000 features cost effective, snap-acting electrical switches and field adjustable set points with a visual scale for easy set point selection. Pressure ranges as low as 2" Water Column (W.C.)* up to 100 PSI are available. Typical applications include gas heaters, pumps, small air compressors and residential boilers.

Sigma-Netics Inc is a manufacturer of low pressure diaphragm switches in various sizes and configurations. Models include both factory set and adjustable low pressure switches.Sigma-Netics Inc also offers high electrical capacity vacuum and low pressure switches for a variety of applications.

Danfoss offers LTB/ETVB pressure switches for low pressure applications. These models are low pressure high precision SPDT pressure switches with a bellows element and a capillary tube of 1 m.Versions for solder connection or 1/4 in flare nut connection.

PC McKenzie Company offers the Axelson ESP pressure switch designed to detect an abnormal operating condition in a safety system and transmitting a signal to perform a specific shutdown function. The Axelson ESP Pressure Sensor is a 3-way block and bleed valve that is controlled by a piston and spring.

ITT offers a full line of pressure switches including low pressure switches and pneumatic switches. These models are suited for weather proof and explosion proof applications and come in a wide selection of sizes and NEMA ratings.

Pressure switches from PSI come in several series including the series 1 differential pressure switch for high pressure and low pressure requirements. PSI also has models for non-hazardous locations with unique bleed port for low level testing and fully anodized aluminum body for maximum corrosion resistance.

BEC Controls Corp manufactures a variety of low pressure switches for applications in the commercial, industrial, military, municipal and agriculture fields including the R70 series low pressure switch with up to 15 amp and 480 VAC ratings and an operating temperature range of -65F to 165F.

Thorco offers pressure and temperature switches from ITT Neo-Dyn. These switches serve the industrial, chemical processing, and energy markets.  Their unique Belleville spring design has no moving parts except during actuation.  This design offers set point stability, extensive cycle life, vibration resistance, and high over-pressure capability.

Honeywell Sensing & Control offers low pressure switches, vacuum switches and high pressure switches including the 5000 series ultra duty low pressure switch. This model comes in a wide array of sizes for various low pressure applications.

Senscon's Series 104 Differential Pressure Switch is an easy to maintain switch for very low pressure applications. The switch can monitor positive, negative, or differential pressure and with an easy to adjust set point knob makes field set up and adjustment hassle free. The differential pressure switch includes a SPDT relay rated for 2A at 250V and can be set as low as 0.08” w.c. (20 Pa).