Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-02-18
1999-03-23
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340628, 340633, 340634, 73 3101, 73 3106, G08B 1710
Patent
active
058866388
ABSTRACT:
A CO concentration monitoring device operating under the control of a processor periodically checks the CO sensor to insure its ongoing integrity and to issue a distinctive audio signal to a user if sensor integrity has become suspect. The periodic integrity check procedure places a predetermined DC voltage across the sensor. Then, the voltage source is removed leaving the sensor charged as a capacitor such that reading the voltage remaining across the sensor, reading the temperature of the sensor and comparing a temperature adjusted representation of the voltage appearing across the sensor to at least one predetermined representation of a voltage representing a threshold at which sensor integrity becomes suspect. If this condition is determined, a sensor condition alert signal responsive is issued to drive a horn in a distinctive audio sequence (e.g., three 10 millisecond duration pulses spaced at about 500 millisecond intervals). In an optional feature, a manually actuable switch serves to selectively inhibit drive to the horn for a predetermined period if the sensor integrity condition has been determined to be marginal, but not yet failing.
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Detweiler Sean
Hofsass Jeffery A.
Martin Terrence
Morris Jules Jay
Pham Toan N.
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