Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 208)

Troubleshooting & Repair Model 9110EH Instruction Manual
11.1.1. Warning Messages
The most common and/or serious instrument failures will result in a warning message
displayed on the front panel. Table A-2 in Appendix A-3 contains a list of warning
messages, along with their meaning and recommended corrective action.
It should be noted 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 is active by displaying the keypad labels
MSG and CLR on the front panel and a text message in the top center line of the display as
shown in this example:
SAMPLE AZERO WARNING NOX =123.4
< TST TST > CAL MSG CLR SETUP
The analyzer will also issue a message to the serial port and cause the red FAULT LED on
the front panel to blink.
To view or clear a warning messages press:
SAMPLE SYSTEM RESET NOX = XXX.X
TEST
CAL MSG CLR SETUP
If warning messages re-appear,
the cause needs to be found. Do
not repeatedly clear warnings
without corrective action.
Press CLR to clear the current
warning message.
If more than one warning is
active, the next message will
take its place.
Once the last warning has been
cleared, the analyzer returns to
SAMPLE Mode.
SAMPLE RANGE=500 PPB NOX = XXX.X
< TST TST > CAL
MSG CLR SETUP
SAMPLE SYSTEM RESET NOX = XXX.X
< TST TST > CAL
MSG CLR SETUP
> keys replaced with
TEST key. Pressing TEST
deactivates warning messages
until new warning(s) are activated.
MSG indicates that warning
messages are active.
All Warning messages are hidden,
but MSG button appears
Figure 11-1: Viewing and Clearing Warning Messages
11.1.2. Fault Diagnosis with Test Functions
Besides being useful as predictive diagnostic tools, the TEST functions, viewable from the
front panel, can be used to isolate and identify many operational problems when combined
with a thorough understanding of the analyzer’s theory of operation (Chapter 10). We
recommend to use the APICOM remote control program to download, graph and archive
TEST data for analysis and long-term monitoring of diagnostic data (Section 6.11.5).
The acceptable ranges for these test functions are listed in Appendix A-3. The actual values
for these test functions on checkout at the factory were also listed in the Final Test and
Validation Data Sheet, which was shipped with the instrument. Values outside the
acceptable ranges indicate a failure of one or more of the analyzer’s subsystems. Functions
with values that are within the acceptable range but have significantly changed from the
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