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| Operation Manual C 2214 | Maintenance
Fig. 18:
Checking the complete vacuum regulator
9.2.3 Checking the safety blowoff valve
For this purpose the vacuum regulator is mounted to the wall holder or to a closed chlorine cylinder. At the dos-
ing tubing apply an excess pressure of 0.03 ... 0.1 bar using dry air. One end of a transparent tubing is loosely
put on the blow-off connection and the other end is immersed in water. After achieving a sufficient excess
pressure, bubbles rise in the water.
Fig. 19: Checking the safety blowoff valve
9.2.4 Activated-carbon cartridge
The filling of the activated-carbon cartridge has to be exchanged either if it is loaded with chlorine or if it gets
lumpy due to humidity.
CAUTION!
There is a strong chlorine smelling if activated carbon is loaded with chlorine gas. Therefore you should abso-
lutely never exchange the filling in closed rooms or in the proximity of aspirating mouths of ventilating systems.
For chlorine neutralization, sodium thiosulfate solution is perfectly suitable.
