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9
Troubleshooting Guide
9.1
Portec
© F. Stephan GmbH
Fault
Floats of the flowmeter
tube do not return to
zero
When changing over
by means of the
AIR/N
O-change-over-
2
switch, the gas that has
not been selected flows
(indicated by theO
-
2
Monitor)
Oxygen concentration
too high
Flush-valve does not
close properly
Failure-of oxygen-
supply
Valves defective
Tab. 1: Troubleshooting Portec
SA-103-0109V1.3-HAO-GB
9
Possible cause
Flowmeter tube
contaminated
Change-over valve is
not tight
Proportioning valve for
oxygen is not tight
Supply pressure is too
low
Troubleshooting Guide
Elimination of fault
Clean flowmeter tube
Exchange of the
change-over valve by
service department
Loosen control knob
and readjust (Service)
Exchange of the flush-
valve by the service
department
Increase setting of
pressure reducer of
supply cylinder
Exchange of valves by
service personnel
33
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