Instruction manual

NGA 2000 MLT Hardware
TROUBLESHOOTING
10 - 9
Emerson Process Management GmbH & Co. OHG
Instruction Manual
90002929
07/2006
10.7 Response time too long (t
90
time)
Possible Causes Check / Correct
a) Incorrect response time (t
90
time). Check the value for t
90
time
(see software manual)
b) Pumping rate inadequate. Check diaphragms and membranes of
gas sampling pump.
The feeder line between the sampling point
and the instrument is too long.
Use a larger, external pump;
consider adding a bypass line to the
process stream for sampling purposes
(see Section 5.3).
c) 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 point alignment
(see Section 17.5 / 11.1.6)
RESPONSE TIME TOO LONG (T
90
TIME)