Alarm and Interlock Switches

Some of the standard arrangements include the single-pole single-throw (SPST), single-pole double-throw (SPDT), and the double-pole double-throw (DPDT) designs, but units are available with up to four poles. These switches 

Standard electric contact configurations used in pressure switches. 

Most elastic elements will have a service life of close to a million cycles, if the cycle time is not less than 5 seconds. If longer service life or higher-cycle frequencies are required, metal fatigue tends to limit the usefulness of elastic elements, and special designs, such as sealed piston elements, should be considered. 

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Control set points, alarm, and interlock switch points (as applicable) Engineering range and signal type/level Operating/calibration tolerances Fail-safe mode... 

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