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Solid state pressure switch

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CONTROL Components has released Gems Sensors’ PS98 series of pressure switches. They use solid state transducer technology to resist the damage that shock and vibration can cause to mechanical switch units.

The series has a polysilicon strain gauge teamed with a custom ASIC to provide accurate, thermal-compensated pressure sensing. The sensing results are used to actuate a solid-state relay or transistor switch. With no moving parts, the construction is designed to deliver more than 100 million transistor actuation cycles under high shock and vibration conditions. This makes it suitable for off-road, mobile or other demanding applications.

The new switches are manufactured using chemical vapour deposition (CVD) technology, producing extremely stable polysilicon strain gauges. CVD manufacturing methods bond a polysilicon strain gauge bridge layer to a stainless steel diaphragm at the molecular level to produce a sensor with superior long-term drift. Repeatability is within 0.25% of the full set point range. The pressure switches are an ideal alternative to electromechanical types when switch action exceeds 50 cycles a minute and a broad frequency response is needed.

The modular design allows for a wide range of configurations. In addition to pressure sensing electronics that range from zero to 400 bar, the series has a broad selection of pressure connections and several electrical termination options, including DIN plugs and IP68 cables. Switch actuation and de-actuation set points are customer specified and set at the Gems factory. It has an operating temperature range from –40°C to 125°C. Power requirement is 12V dc to 32V dc. The switch body (minus pressure port and electrical termination) is less than 68mm long and 38mm in diameter.

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