Instruction manual

NGA 2000 MLT Hardware
TROUBLESHOOTING
10 - 8
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
10.6 Fluctuating or erroneous display
Possible Causes Check / Correct
a) Leakage into gas circuit. Perform a leakage check (see Section 14).
b) Ambient air contains gas constituent to Purge the instrument.
be measured in excessive concentration.
c) Gas pressure subject to Check the gas lines preceding and following
excessive fluctuations. the instrument.
Eliminate any restrictions found beyond the
gas outlet fitting.
Reduce pumping rate or flow rate.
d) Contamination of the gas paths Check if photometric components are dirty,
clean or replace the components if necessary
(cf. Section 17.).
Check and adjust physical zero poin alignmentt
(see Section 17.5 / 11.1.6)
e) Barometric pressure effects See Section 10.3.8
f) Temperature below the dew point Check the temperature of the gas paths
in the gas paths and eliminate any reason of condensation.
Maintain all temperatures at values at least
10 °C above the dew point of sample gas.
Check gas paths and gas conditionning
for condensation and clean or exchange.
FLUCTUATING OR ERRONEOUS DISPLAY