Proximity sensor interface device and method for its use

A device for determining a position of a proximity sensor with respect to a target mechanism is described. The device includes a frequency generator, a processing device, and an RC circuit. An output of the frequency generator is operable for application to a proximity sensor whose position relative to a target is to be verified. The RC circuit is chargeable via voltage applied to the proximity sensor by the frequency generator. The processing device is programmed to turn off the output of the frequency generator after a prescribed amount of time, and further programmed to measure a discharge time of the RC circuit after turning off the output of the frequency generator. The discharge time of the RC circuit is directly proportional to a perceived gap between a face of the proximity sensor and the target mechanism.