Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 230)

Model 9110TH NOx Analyzer Troubleshooting & Repair
Teledyne Analytical Instruments 210
SAMPLE A1:NXCNC1=100PPM NOX=XXX.X
< TST TST > CAL SETUP
SETUP X.X PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
SETUP X.X SECONDARY SETUP MENU
COMM VARS DIAG ALRM EXIT
SETUP X.X ENTER PASSWORD:818
8 1 8 ENTR EXIT
DIAG SIGNAL I/O
NEXT ENTR EXIT
DIAG I/O 0) EXT_ZERO_CAL =OFF
NEXT JUMP ENTR EXIT
DIAG I/O JUMP TO:0
0 0 ENTR EXIT
DIAG I/O JUMP TO:25
0 7 ENTR EXIT
DIAG AIO 07) CAL_LED=ON
PREV NEXT JUMP ON PRNT EXIT
Enter 07 to Jump
to Signal 7:
(CAL_LED)
Toggle to turn the
CAL LED ON/OFF
See Menu Tree
A-6 in Appendix
A.1 for a list of
I/O Signals
7.2. GAS FLOW PROBLEMS
The 9110TH/M has two main flow paths, the sample flow and the flow of the ozone
supply air. With zero/span valve option installed, there is a third (zero air) and a fourth
(span gas) flow path, but either one of those is only controlled by critical flow orifices
and not displayed on the front panel or stored to the DAS. The full flow diagrams of the
standard configuration and with options installed (Appendix D, document 04574) help in
trouble-shooting flow problems. In general, flow problems can be divided into three
categories:
 Flow is too high
 Flow is greater than zero, but is too low, and/or unstable
 Flow is zero (no flow)
When troubleshooting flow problems, it is essential to confirm the actual flow rate
without relying on the analyzer’s flow display. The use of an independent, external flow
meter to perform a flow check as described in Section 4.13.7.5 is essential.
The flow diagrams found in a variety locations within this manual depicting the 9110TH
and 9110TM in their standard configuration and with options installed can help in
trouble-shooting flow problems. For your convenience they are collected here in
Sections 11.2.1 (9110TH) and 11.2.2 (9110TM)