Gems Sensors - PRODUCT NEWS

Solid-state pressure switch from Gems
resists vibration damage.

The new P598 series of pressure switches from
Gems Sensors uses solid state transducer technology
to resist the damage that shock and vibration can
cause to mechanical switch units.

Answering industry's demand for solid-state switches, the PS98
series features 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 the P598 Series
ideal for off-road, mobile or other demanding applications.

The new switches are manufactured using Gems proven 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 PS98 pressure switches are an ideal alternative to electromechanical
types when switch action exceeds 50 cycles/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 0 to 400 bar, the PS98
series offers a broad selection of pressure connections and several
electrical termination options, including DIN plugs and 1P68 cables.
Switch actuation and de-actuation set points are customer specified
and set at the Gems factory. Operating temperatures range from -40°C
to 125°C. Power requirement is 12 to 32 Vdc. The switch body (minus
pressure port and electrical termination) is less than 68mm long and
38mm in diameter.

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November 2004
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