Dräger Polytron 7000 Instructions For Use Manual page 37

Installing accessories
— The pressure difference between the flow inlet and the environment of the
transmitter can cause an additional measurement error.
CAUTION
In order to check for leaks, we recommend that you measure the flow at the
inlet point and behind the transmitter before using the pump module for the
first time and every six months thereafter.
Do not block the lower gas line of the pump adapter. This can damage the
gas sensor.
37