Carbon monoxide alarms ??-2

Carbon monoxide alarm ??-2 is designed for continuous, automatic control of carbon monoxide (CO).
The principle of operation of the detector is based on conversion of gas concentration level into voltage by means of semiconductor thermocatalytic sensor. The voltage value obtained by changing the gas concentration is compared with the voltage value set during calibration, which corresponds to the threshold level of gas concentration. If the measured gas concentration exceeds the threshold level, sound, light and control signals are generated in accordance with the logic of the detectors operation.
The detectors are available in 2 versions:
- ??-2-2D (duplicating) - outputs and inputs for connection of an external receiver are made with CMOS - signal level (10-15 V),
- ??-2-2-2B - with an output stage for connection of an external receiver, made according to the scheme with an open collector output (OC).