afriso GS 1.1 Notice Technique page 41

The gas alarm unit GS 2.1 allows you to activate or deactivate sensor S1 for
gas detection in the gas alarm unit GS 2.1 by means of the jumper (B1). The
function depends on whether a gas sensor GS 4.1 is connected or not. The
following table shows the jumper settings with which the sensor S1 for gas
detection in the gas alarm unit GS 2.1 is activated or deactivated:
Gas sensor GS 4.1
GS 4.1 connected
GS 4.1 not connected
The product is ready for operation once you have established the electrical
connection.
Mounting
Sensor S1
S1 activated
S1 not activated
Jumper setting
GS 1.1./GS 2.1/GS 4.1
EN
17