Accession Number : ADD002236

Title :   Time and Condition Data Logger.

Descriptive Note : Patent,


Personal Author(s) : Spangler,Ayers M ; Vagnoni,Luigi A

Report Date : 14 Oct 1975

Pagination or Media Count : 5

Abstract : 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.

Descriptors :   *Recording systems, *Patents, Time interval counters, Temperature, Data acquisition

Subject Categories : Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE