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