Circuit arrangement for a gas measuring and gas analysis apparat

Details Circuit arrangement for a gas measuring and gas analysis apparat Circuit arrangement for a gas measuring and gas analysis apparat

1981-08-31

1983-07-19

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

340632, G01N 3100

Patent

active

043936865

ABSTRACT:
A circuit arrangement for an apparatus for measuring and analyzing gases which emits a signal when a specified gas concentration is exceeded and which is capable of recalling the maximum value of gas concentration measured. A binary counter acted upon by an oscillator is connected to a digital-analog converter via a digital storage, and a digital-comparator compares the binary values of the counter output from the binary counter and the input to the digital-analog converter. An analog comparator receives the measured value input from a gas measuring device and the maximum value output from the digital-analog converter, and the digital storage is opened via a logic section when the voltage at the measured value input is greater than the voltage at the maximum value output and the digital storage also has equal signals at the input and output thereof.

REFERENCES:
patent: 4064498 (1977-12-01), Burr et al.

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