Response Time Too Long (T90 Time) - Emerson ROSEMOUNT Analytical NGA 2000 Instruction Manual

Instruction Manual
90002929
07/2006
10.7 Response time too long (t
Possible Causes
a) Incorrect response time (t
b) Pumping rate inadequate.
c) Contamination of the gas paths
Emerson Process Management GmbH & Co. OHG
time)
90
time). Check the value for t
90
(see software manual)
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).
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)
NGA 2000 MLT Hardware
TROUBLESHOOTING
RESPONSE TIME TOO LONG (T
Check / Correct
time
90
TIME)
90
10 - 9