4Warn Carbon Monoxide Alarm

Front
Front

This is an old CO alarm, which was totally dead, having been connected to the wrong PSU.
Here is the front of the unit, with the Test button & indicator LEDs.

Overview
Overview

Front of the PCB, 3 1.5v cells powered the unit, Piezo sounder & sensor cell in the centre of the board.

PCB Rear
PCB Rear

Rear of the PCB with the detection logic.

Sensor
Sensor

Sensor cell. Electrochemical type.

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