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GEMS SENSORS

GEMS SENSORS, a brand of Gems Sensors & Controls, is a manufacturer of fluid-sensing and control components headquartered in Plainville, Connecticut, USA. The company has been in operation since 1955 and is known for its broad portfolio of flow, level, pressure, and temperature sensors and switches. 3G Electric supplies a range of GEMS SENSORS products, including piston flow switches, thermal-dispersion flow switches, flow sights, and turbine flow sensors, supporting industrial applications such as burner management, pump protection, and process control. The product line covers fixed and adjustable set-point switches, with materials including brass, PPS, polypropylene, and polysulfone, and connection sizes from 1/4 in to 3/4 in NPT or UNF. Key specifications include SPST or SPDT switch types, contact ratings up to 20 V DC or 45 mA at 30 V AC, and operating temperatures from -20°F to 212°F. Some models carry UL listing, indicating compliance with safety standards. The flow switches are designed for liquid media and are available in general-purpose, high-pressure-rated, and inline configurations. The turbine flow sensors offer accuracy within ±3% and flow ranges from 0.13 gpm to 2 gpm. 3G Electric provides datasheets and logistics support for these SKUs, enabling engineers and procurement specialists to source components for system integration without relying on marketing claims.

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About GEMS SENSORS

GEMS SENSORS, a brand of Gems Sensors & Controls, is a manufacturer of fluid-sensing and control components headquartered in Plainville, Connecticut, USA. The company has been in operation since 1955 and is known for its broad portfolio of flow, level, pressure, and temperature sensors and switches. 3G Electric supplies a range of GEMS SENSORS products, including piston flow switches, thermal-dispersion flow switches, flow sights, and turbine flow sensors, supporting industrial applications such as burner management, pump protection, and process control. The product line covers fixed and adjustable set-point switches, with materials including brass, PPS, polypropylene, and polysulfone, and connection sizes from 1/4 in to 3/4 in NPT or UNF. Key specifications include SPST or SPDT switch types, contact ratings up to 20 V DC or 45 mA at 30 V AC, and operating temperatures from -20°F to 212°F. Some models carry UL listing, indicating compliance with safety standards. The flow switches are designed for liquid media and are available in general-purpose, high-pressure-rated, and inline configurations. The turbine flow sensors offer accuracy within ±3% and flow ranges from 0.13 gpm to 2 gpm. 3G Electric provides datasheets and logistics support for these SKUs, enabling engineers and procurement specialists to source components for system integration without relying on marketing claims.

Common Applications

  • Burner management — GEMS SENSORS FS-4 piston flow switch for monitoring cooling water flow in industrial burners
  • Pump protection — GEMS SENSORS FS-380 high-pressure flow switch to detect loss of flow in pump systems
  • Process control — GEMS SENSORS 230500 thermal-dispersion flow switch for low-flow detection in chemical processes
  • Cooling systems — GEMS SENSORS RFS flow sight with remote output for visual and electrical flow indication in heat exchangers
  • Water treatment — GEMS SENSORS FT-110 turbine flow sensor for measuring flow rates in filtration systems
  • Hydraulic systems — GEMS SENSORS FS-500 polypropylene piston flow switch for corrosive fluid monitoring in hydraulic circuits

Frequently asked questions

Common questions about GEMS SENSORS from 3G Electric.

What types of flow switches does GEMS SENSORS offer through 3G Electric?

GEMS SENSORS offers piston flow switches, thermal-dispersion flow switches, and flow sights with remote output or indicator. Piston switches are available in general-purpose and high-pressure-rated versions, with materials like brass, PPS, or polypropylene. Thermal-dispersion switches are inline with fixed set points and SPST normally open contacts. Flow sights include rotor indicators or SPDT switches for remote signaling. All are designed for liquid flow monitoring in industrial systems.

What are the typical contact ratings for GEMS SENSORS flow switches?

Contact ratings vary by model. Piston flow switches like the FS-4 and FS-380 have a DC contact rating of 20 V. Thermal-dispersion switches, such as the 230500 series, are rated at 45 mA at 30 V AC and 65 mA at 42 V DC. These ratings are suitable for low-power control circuits in burner or pump systems. Always verify the specific SKU datasheet for exact electrical specifications.

Are GEMS SENSORS flow switches suitable for high-pressure applications?

Yes, certain models are designed for high-pressure environments. For example, the FS-380 piston flow switch (SKU 1ALV8) is a compact, high-pressure-rated unit with a brass body and 3/8 in NPT connection. It is intended for applications where system pressure exceeds standard ranges. Check the datasheet for maximum pressure ratings, as these are not listed in the basic specifications.

What materials are used in GEMS SENSORS flow switches?

Materials vary by model. Common wetted materials include brass, PPS (polyphenylene sulfide), polypropylene, and Viton seals. Sight materials for flow indicators include polysulfone. For example, the RFS flow sight (SKU 1AMB4) uses brass wetted material and Viton seals, while the RFI indicator (SKU 1AMD8) uses brass and polysulfone. Material selection depends on fluid compatibility and operating conditions.

Do GEMS SENSORS flow switches have any safety certifications?

Some models carry UL listing, as indicated for the RFS flow sight (SKU 1AMB4). UL listing signifies that the product has been tested to meet specific safety standards for electrical and fire hazards. Not all GEMS SENSORS products are UL listed; verify the specific SKU or datasheet for certification details. Other models may comply with industry standards but are not explicitly certified.

What is the accuracy of GEMS SENSORS turbine flow sensors?

The FT-110 turbine flow sensor (SKU 1ALZ3) has an accuracy of ±3% over its flow range of 0.13 gpm to 2 gpm. This accuracy is typical for inline turbine sensors used in liquid flow measurement. For applications requiring higher precision, consider other sensor types or consult the datasheet for calibration options.