Means for calibrating pressure switches at extra-low...

Details Means for calibrating pressure switches at extra-low... Means for calibrating pressure switches at extra-low...

H - Electricity

01

H

324/21

H01H 3/24 (2006.01) H01H 35/26 (2006.01) H01H 49/00 (2006.01)

Patent

CA 1042509

ABSTRACT A simplified calibration mechanism is provided for a pressure switch using an adjustable, spring-biased plunger arrangement for controlling the trip force and hence the pressure to which the switch responds. The mechanism includes an especially configured lever pivoted at one end, contacting an especially shaped cam as a follower at its other end and the plunger at its mid portion. A first calibration device is provided at the lever's pivoted end to adjust the normal low- high pressure settings of the switch. Another calibration device is provided to isolate the lever and cam from the plunger for effecting a precise setting of the pressure switch at extra-low pressures.

210980

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