| 摘要 |
A combustion product indicating device for use as a calibration or surveying instrument is disclosed. The device senses the presence of combustion and provides an indication of the same including an indication of the amount of combustion sensed within predetermined limits. An ionization detector is utilized to sense the products of combustion and provide an output indicative thereof, which output is coupled through a field effect transistor to a pair of operational amplifiers, which amplifiers function as followers with the latter amplifier having a reference input that may be varied to adjust the reading of a meter, which meter receives the output from the operational amplifiers. Optional circuitry is also provided for providing a voltage output that varies within predetermined limits and is indicative of the amount of combustion sensed. A method for calibrating combustion detectors is also disclosed.
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