Bridge circuit arrangement for a gas detection instrument

Details Bridge circuit arrangement for a gas detection instrument Bridge circuit arrangement for a gas detection instrument

1977-06-20

1978-11-07

Kreitman, Stephen A.

Measuring and testing

Gas analysis

By vibration

324DIG1, G01N 2718

Patent

active

041239342

ABSTRACT:
A bridge circuit is provided for a gas-detecting instrument of the type using an electrically-heated resistance element or filament as a sensing element. In order to prevent use of the instrument during the warmup period after initial energization, a portion of the bridge is short-circuited for a predetermined time after energization. The short-circuiting means is preferably a transistor connected across one of the arms of the bridge and controlled by a flip-flop with suitable time-delay circuits for switching the flip-flop.

REFERENCES:
patent: 3678489 (1972-07-01), Scherban et al.
patent: 3879717 (1975-04-01), Gruensfelder
patent: 4007456 (1977-02-01), Paige et al.

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