5
Functional description
Page 48
gas-lab
Q1
5.1.4 Cylinder change
Different gases must be available in the plant for calibration and measurement
tasks. Therefore it might be necessary from time to time to connect another gas
cylinder to a gas supply connection of the
gas-lab
sensor housing; for instance,
if the pressure of the methane cylinder is insufficient for the 1-point calibration to
be carried out.
To remove an existing cylinder, proceed as follows:
1. Close the old cylinder at the main valve on top of the cylinder and
unpressurize the connected gas line. You possibly have to wait until the
remaining gas has been used up or use an available venting possibility
(preferably low pressure side).
2. Remove the cylinder connection from the cylinder and close the cylinder
with the corresponding nut.
3. Place the protective cap on the cylinder and fasten it..
4. Not until now detach the protection against falling down (safety chain or
clamp) and remove the cylinder.