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TROUBLESHOOTING & REPAIR
11.4. Other Performance Problems
Dynamic problems (i.e. problems which only manifest themselves when the analyzer is
monitoring sample gas) can be the most difficult and time consuming to isolate and
resolve. The following section provides an itemized list of the most common dynamic
problems with recommended troubleshooting checks and corrective actions.
11.4.1. Excessive noise
Excessive noise levels under normal operation usually indicate leaks in the sample supply
or the analyzer itself. Make sure that the sample or span gas supply is leak-free and
carry out a detailed leak check as described earlier in this chapter.
Another possibility of excessive signal noise may be the preamplifier board, the high
voltage power supply and/or the PMT detector itself. Contact the factory on trouble-
shooting these components.
11.4.2. Slow Response
If the analyzer starts responding too slowly to any changes in sample, zero or span gas,
check for the following:
•
Dirty or plugged sample filter or sample lines.
•
Sample inlet line is too long.
•
Dirty or plugged critical flow orifices. Check flows, pressures and, if necessary,
change orifices (Section 11.5.).
•
Wrong materials in contact with sample - use Teflon materials only.
•
Sample vent line is located too far from the instrument sample inlet and causes
long mixing and purge times. Locate sample inlet (overflow) vent as close as
possible to the analyzer's sample inlet port.
•
Dirty sample chamber. Clean the sample chamber.
•
Insufficient time allowed for purging of lines upstream of the analyzer.
•
Insufficient time allowed for SO
11.5. Subsystem Checkout
The preceding sections of this manual discussed a variety of methods for identifying
possible sources of failures or performance problems within the analyzer. In most cases
this included a list of possible causes and, in some cases, quick solutions or at least a
pointer to the appropriate sections describing them. This section describes how to
determine if a certain component or subsystem is actually the cause of the problem being
investigated.
208
calibration gas source to become stable.
2
Model 100E Instruction Manual
045150102 Rev XB1
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Troubleshooting
