| 摘要 |
A pressure responsive sender whose electrical resistance varies in response to variations in sensed pressure, adapted to be inserted in series with a voltage source and a pressure indicating gauge, such as an oil pressure indicating gauge. The sender includes a pressure sensing diaphragm coupled to a contact assembly which electrically engages a variable resistor assembly to an extent which is a function of the sensed pressure so that a predetermined electrical resistance for a particular sensed pressure is obtained. A dual stage spring system is associated with the pressure sensing assembly providing increased sensitivity in a low pressure range, a well-defined cut-off pressure and accurate calibration of the sender. The resistor and contact assemblies are pivotally mounted in a manner such that hysteresis problems, i.e., obtaining slightly different resistance values for identical pressures after cycling, are eliminated. The pivotal mounting of the elements also assures substantially identical sensitivity for devices produced in quantity.
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