Reed Switch Specialist HSI Sensing & Genisco Come Together in Expanded Facility 

HSI Sensing (Hermetic Switch, Inc.) is now operating out of a new 25,000-sq. ft. main facility built to meet increased production demands for its extensive line of reed switches and magnetic sensors, and to house its subsidiary Genisco Filter Corp., a manufacturer of EMI/RFI power line filters whose operations have been relocated from Wisconsin. 

“The new facility is a logical and necessary step toward strengthening HSI Sensing’s position as a global competitor,” said Travis Posey, vice president of business development. “This new facility will handle an increasing volume of orders while solidifying a long-term strategy that aims to amplify growth for years to come.” As a multigenerational company, HSI Sensing has grown progressively over more than 50 years and currently produces its sensing technology, which includes the world’s smallest reed switch and the world’s highest voltage reed switch, at its longstanding location in Chickasha, Oklahoma. 

“The new facility will bring these two companies together under one roof,” said Posey. “The geographical circumstances at the two segmented locations offered limited opportunities for expansion. Concentrating entire production chains – from pre-fabrication to final assembly – in one place guarantees optimized production processes for both businesses.” 

HSI’s custom and standard reed switches, proximity sensors, and other sensing technologies are designed and produced for an array of industries including fluid control devices, reed relays, implantable medical devices, aerospace, heavy equipment, communications and transportation. They 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 and animal tracking. 

The reed switch, shown above, is an electrical switch operated by an applied magnetic field. Sensors use them as the heart of their switching mechanism. When paired with a permanent magnet they are a fundamental method of sensing and detecting metal, movement, proximity, and liquid level and flow. HSI also makes high-security door contacts. Its Sentinel technology utilizes Hall sensors and intelligent algorithms to make them resistant to physical, electrical and magnetic tampering. 

QuadPack filter panel from Genisco released in 2020 

Genisco designs and manufactures sophisticated EMI/RFI filters for power lines, signal lines and custom applications to protect and facilitate power and secure communications for shielded rooms and buildings. Its Quadpack filter panel, for example, was introduced two years ago as a smaller, lighter 100 amp system. The company provides its products to computer peripheral manufacturers, government agencies, military and aerospace contractors, electrical contractors and shielded room suppliers. For more info, see and