Gems Sensors & Controls Circuit Breakers
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About Gems Sensors & Controls
Gems Sensors & Controls has been engineering precision sensing and fluid control solutions since 1955. Founded in Plainville, Connecticut, the company got its start when Edward H. Moore developed a liquid level indicator in his basement — a product that was later patented in 1959. Together with Gordon Seigle, Moore established the Gems Company, and their first commercial success — a bilge switch for the small boating industry — set the tone for decades of innovation across demanding industrial environments.
Today, Gems is a globally recognized manufacturer with ISO-certified facilities across North America, Europe, and Asia, shipping over five million sensors annually to customers in industries ranging from medical devices and semiconductor fabrication to water management, transportation, and HVAC. Whether the application calls for monitoring fluid levels in a boiler, detecting flow in an HVAC system, or controlling a solenoid valve in a complex fluidic assembly, Gems engineers solutions that perform reliably under pressure — literally and figuratively.
What Gems Sensors & Controls Makes
The Gems product portfolio spans liquid level sensors, flow sensors, pressure sensors and transducers, temperature switches, miniature solenoid valves, proximity switches, and fully integrated fluidic systems. Their sensing technologies include electro-optic, float-based, conductivity, capacitance, ultrasonic, and magnetostrictive types — giving engineers a wide range of options to match the right technology to the right application.
For HVAC professionals and contractors, Gems offers a strong lineup of HVAC Sensors & Probes and HVAC Control Modules engineered to manage temperature, pressure, and flow in heating and cooling systems. Their pressure sensors are specifically designed for demanding HVAC environments, with product configurations available for gauge, absolute, differential, and vacuum measurement types across a broad range of operating pressures.
Gems is equally well regarded in the heating equipment sector. Their Boiler Control Boards & Modules — including products under the Warrick Controls brand — are trusted by technicians for conductivity-based liquid level detection and control in boilers and similar pressurized systems. Gems solutions are also found in Pool & Unit Heater Parts, where reliable fluid sensing is critical to safe and efficient operation.
One of Gems' most storied product categories is Float Switches. With a heritage tracing back to the company's original level indicator, Gems float switches are available in single-point and multi-point configurations and are compatible with a wide variety of liquid media — from water and hydraulic fluids to chemical and industrial process fluids.
Why Engineers and Technicians Trust Gems
What sets Gems apart is the depth of application engineering experience behind every product. Their R&D teams simulate real application environments and conduct rigorous environmental testing on every component before it ships. Standard catalog products can often be modified with alternate connectors and housings, and fully custom solutions can be developed in OEM volumes with short lead times — making Gems a practical partner for both one-off service repairs and high-volume production builds. When sensing accuracy and system reliability are non-negotiable, Gems Sensors & Controls has more than 70 years of proof that they can deliver.