HSI Sensing is the catalyst that helps drive innovation in any and every industry by transforming mechanical motion into electrical signals.

Since 1968, HSI Sensing, an ISO 9001:2008 and AS9100 registered company, has been the premier choice for custom and standard reed switches, proximity sensors, and other sensing technologies for an array of industries including fluid control devices, reed relays, implantable medical devices, aerospace, heavy equipment, communications, and transportation.

Our products are used in a variety of applications including commercial and military jet engines, security systems, commercial lawn mowers, external defibrillators, implantable medical devices, space station equipment, animal tracking, and more.

Sentinel High Security Sensors

Sentinel technology utilizes Hall sensors and intelligent algorithms making them resistant to physical, electrical and magnetic tampering.

  • UL Certified
  • Drop-In Ready
  • Tamper Resistant
  • Reduced False Alarms
  • Versatile Mounting Options

Spot On™

Spot On™ is our exclusive line of no-touch leverless limit switches, built for the toughest environments, and designed to fit seamlessly with your applications with ready-set modifications and flexible specs.

  • No-Touch Sensing
  • Not Gravity Sensitive
  • Data-Coded for Traceability
  • Vacuum-Sealed Contacts
  • Stable Contact Resistance

Hazardous Location Sensors

When performance matters, rely on our elite group of hazardous location sensors that meets standards for being explosion-proof and dust-ignition-proof.

  • UL 1203 Listed
  • Not ESD Sensitive
  • Vacuum-Sealed Contacts
  • Magnetic Sensors
  • Latching Switches

Reed Switches

HSI Sensing’s reed switches feature the highest range of sizes, unique switching capabilities, quality and life expectancy on the market.

  • HSR-0025R World’s Smallest Form A
  • HSR-910W World’s Highest Voltage Reed Switch
  • Only True Form B Switch
  • High Voltage Switches
  • RF Switches

Proximity Sensors

When paired with a permanent magnet, our proximity sensors are an ideal method of sensing and detecting metal, movement, proximity, and liquid level and flow.

  • Limit Switching
  • Steel Sensors
  • Non-Actuator Sensors
  • Pick-and-Place Products
  • Extreme Environment Capabilities

Magnets and Actuators

We can tailor a standard product or start from scratch with a new magnetic design to solve for low and high frequencies, power inductors and common mode choke needs.

  • Pairs with Proximity Sensors
  • Magnet Surface Mounting Capabilities
  • Various Magnet Shapes
  • Multiple Magnet Dimensions Available
  • Choice of Gauss Strength and Material