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Troubleshooting & Service Teledyne API - T100 UV Fluorescence SO2 Analyzer
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12.4.7. DISCREPANCY BETWEEN ANALOG OUTPUT AND DISPLAY
If the concentration reported through the analog outputs does not agree with the value
reported on the front panel, you may need to re-calibrate the analog outputs. This
becomes more likely when using a low concentration or low analog output range.
Analog outputs running at 0.1 V full scale should always be calibrated manually. Refer
to Section 5.9.3.3 for a detailed description of this procedure.
12.5. 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.
12.5.1. EXCESSIVE NOISE
Excessive noise levels under normal operation usually indicate leaks in the sample
supply or the analyzer itself. Ensure that the sample or span gas supply is leak-free and
carry out a detailed leak check as described earlier in this section.
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.
12.5.2. 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 (refer to Section 11.3.4).
Wrong m
a
terials in contact with sample - use Teflon materials only.
Sample vent line is located too far from the instrument sample inlet causing a long
mixing and purge time. Locate sample inlet (overflow) vent as close as possible to
the analyzer’s sample inlet port.
Dirty sample chamber.
Insufficient time allowed for purging of lines upstream of the analyzer.
Insufficient time allowed for SO
2
calibration gas source to become stable.
12.5.3. THE ANALYZER DOESN’T APPEAR ON THE LAN OR INTERNET
Most problems related to Internet communications via the Ethernet card will be due to
problems external to the analyzer (e.g. bad network wiring or connections, failed routers,
malfunctioning servers, etc.) However, there are several symptoms that indicate the
problem may be with the Ethernet card itself.
06807C DCN6650