Hydrogen chloride (HCl) probe/transmitter distance from the release source is a general standard
1. The outdoor should not be larger than 2 meters
2. The indoor area should not be larger than 1 meter.
In addition: because hydrogen chloride (HCl) gas is heavier than air, the probe should be installed more than 30cm from the ground.
The part of the white metal casing sensor is mounted downwards.
