PRODUCT  : SENSOR   :  HSI Sensing (Formerly Hermetic Switch Inc)

HSI Sensing (Formerly Hermetic Switch Inc) began manufacturing reed switches and proximity sensors in 1968. These devices complete electrical circuit paths when magnetism is placed in close proximity to the switch or sensor. HSI Sensing specializes in the difficult to manufacture products. For example, pacemakers of the highest quality contain the world's smallest reed switch, which is made in their Hi-Rel department. Additional applications include the International Space Station, Golf and Turf Equipment, Hearing Aids, Valve Controls, Aircraft, Hospital Defibrillators and many more unique applications where quality and reliability are required.


Micro-Minature Reed Switch

Minature Reed Switch

Standard Reed Switch

High Voltage Reed Switch

High Power Reed Switch

Radio Frequency Reed Switch

Bi-Stable Latcher Reed Switch



Proximity Sensors

Overmolded, Minature Reed Switch Proximity Sensor

Surface Mount Proximity Sensor

Tubular Proximity Sensor

Industrial, Alarm Proximity Sensor

Steel Sensing Proximity Sensor

Low Profile Proximity Sensor

High Power Proximity Sensor




Square Magnets

Cylindrical Magnets



Test Coils


Please contact our Sales for inquiries and quotation. We are pleased and ready to launch our best services to you!



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