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WITT-GASETECHNIK GmbH & Co KG
Gas Safety- & Control Equipment
6.4 Shut-down
The gas analyser has been designed for continuous operation. After a shut down of the gas analys-
ing system, the complete start-up procedure needs to be performed before full operability of the
system can be re-established!
Close all gas supplies to the gas analyser.
Disconnect the analyser from the mains.
Caution !
For technical reasons some residual gas pressure will remain trapped in the gas lines which
will be released when the inlet connections are unscrewed.
6.5 Malfunctions and rectification
6.5.1 Malfunction table
Malfunction Cause Remedy
•
The result of the anal-
ysis does not match
with the expected val-
ues
•
The concentration is not as it
was expected
•
Wrong measuring gas / carri-
er gas combination in MGM
selected
•
Analyser not correctly cali-
brated
•
Calibration gas settings at the
analyser module does not
match with the calibration gas
concentrations
•
Inlet filter clogged
•
Instrument internally contam-
inated by liquid
•
Change composition of the
gas mixture
•
Select adequate measuring
gas / carrier gas combination
for the analysis gas
•
Calibrate analyser
(Section 6.3 and 7.3)
•
Adjust the setting for calibra-
tion gas concentrations
(Section 7.3.1 and 7.3.2)
•
Replace filter
•
Contact
WITT-GASETECHNIK,
have analyser checked
•
After switching power
on, the display is not
illuminated
•
Instrument is not connected
to main power supply
•
Defective fuse
•
Check connection to mains
and rectify, as applicable
•
Check and replace fuse if
necessary. If the fuse is de-
fective immediately after re-
placing contact
WITT-GASETECHNIK,
•
Min. concentration
alarm
•
Concentration falls below
lower threshold limit of the
respective gas
•
Check adjustment of gas
mixer
•
Check gas supply
•
Check threshold limit
•
Max. concentration
alarm
•
Upper threshold limit of the
respective gas is exceeded
•
Check adjustment of gas
mixer
•
Check gas supply
•
Check threshold limit
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