GD250W3E/4E is IAQ(Indoor Air Quality) sensor, which has been designed to detect carbon monoxide gas in the air. This model has high accuracy at low concentration, so it optimum for parking lot, tunnel and under ground places. Also, the advantage of this model is compact size and easy installation.
High sensitivity and selectivity to carbon monoxide
Low sensitivity to alcohol vapor
Solid state sensor
Linear 2 to 10 Vdc or 4 to 20mA output