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Flow Switches

Gems

Gems Sensors, Inc. is a leading manufacturer of level switch products, pressure switch instruments, flow switch devices, and liquid level control units for use in a broad range of fluids across the industry. Gems products feature an ever-expanding selection of sensing technologies including: electro-optic, ultrasonic level sensors, float type, CVD, thin film, piezo-resonant, capacitance, hall effect and conductance products and services.

Mcdonnell

We are a leader in engineering and manufacturing of boiler controls, liquid level controls and flow switches for steam and hot water boilers. Mcdonnell's extensive line of products includes:
 - Low Water Cut-offs
 - Liquid Level Controls
 - Liquid Flow Switches
 - Air Flow Switches
 - Combination Low Water Cut-offs/Pump Controllers
 - Water Feeders
 - Valves