Time and Condition Data Logger.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes a conditon vs. time data logger for recording on a digital elapsed-time meter and a strip chart recorder, the time and duration of a predetermined condition on an object or in an environment to be monitored. Temperature is detected by a thermistor in a bridge circuit, the signal is then amplified, and applied to a plurality of comparators which compare the signal representative of temperature to reference voltages individually preset at each comparator. If the predetermined condition is met, and the signal matches the reference voltage, a comparator actuates a relay which energizes an elapsed time digital meter and displaces the pen on a strip chart recorder, thus logging the time and the duration of a condition desired to be recorded.
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