Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 222)

Model 9110TH NOx Analyzer Troubleshooting & Repair
Teledyne Analytical Instruments 202
 Suspect a leak first! Technical Support data indicate that the majority of all
problems are eventually traced to leaks in the pneumatic system of the
analyzer (including the external pump), the source of zero air or span gases
or the sample gas delivery system. Check for gas flow problems such as
clogged or blocked internal/external gas lines, damaged seals, punctured gas
lines, a damaged pump diaphragm, etc.
 Follow the procedures defined in Section 3.6.3. to confirm that the
analyzer’s vital functions are working (power supplies, CPU, relay board,
PMT cooler, etc.). See Figure 3-5 for general layout of components and
sub-assemblies in the analyzer. See the wiring interconnect diagram and
interconnect list in Appendix D.
7.1.1. FAULT DIAGNOSIS WITH WARNING MESSAGES
The most common and/or serious instrument failures will result in a warning message
being displayed on the front panel. Table 4-3 lists warning messages, along with their
meaning and recommended corrective action.
It should be d that if more than two or three warning messages occur at the same time, it
is often an indication that some fundamental analyzer sub-system (power supply, relay
board, motherboard) has failed rather than an indication of the specific failures
referenced by the warnings. In this case, a combined-error analysis needs to be
performed.
The analyzer will alert the user that a Warning message is active by flashing the red
FAULT LED, displaying the Warning message in the Param field along with the CLR
button (press to clear Warning message). The MSG button displays if there is more than
one warning in queue or if you are in the TEST menu and have not yet cleared the
message. The following display/touch screen examples provide an illustration of each: