Multi-use sensor having a controllable number of measurement cyc

Details Multi-use sensor having a controllable number of measurement cyc Multi-use sensor having a controllable number of measurement cyc

1998-03-23

1999-08-17

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

G01N 100

Patent

active

059396091

ABSTRACT:
The multi-use sensor has a controllable number of measurement cycles. This multi-use sensor consists of a sensor and/or electrodes that are encased in a suitable material to allow reuse of the sensor and sensor life cycle circuitry that functions to regulate the number of operational cycles that the sensor can execute to ensure that the multi-use sensor is not used beyond its effective life. Included in this life cycle circuitry is a dual state mechanism that is connected across two conductors and that has a first state of low impedance. There is sensor state change apparatus that changes the state of the dual state mechanism to a second state of high impedance, such as an open circuit between the two conductors. The sensor state change apparatus determines the state of the dual state mechanism and, if the dual state mechanism is in the first state, it applies a control signal to the dual state mechanism to switch this mechanism into the second state upon activation of the multi-use sensor to perform a measurement. Once the dual state mechanism is in the second state, a processor maintains a count of the number of times that the multi-use is operated to perform a measurement. Once the maintained count reaches a predetermined count, the processor disables the multi-use sensor to prevent it from being used beyond its predetermined useful life.

REFERENCES:
patent: 4890306 (1989-12-01), Noda
patent: 5582696 (1996-12-01), Sheehan

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