Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 163)

Operating Instructions Model 9110TH NOx Analyzer
Teledyne Analytical Instruments 143
4.13.7.2. Optic Test
The optic test function tests the response of the PMT sensor by turning on an LED
located in the cooling block of the PMT (Fig. 10-15). The analyzer uses the light
emitted from the LED to test its photo-electronic subsystem, including the PMT and the
current to voltage converter on the pre-amplifier board. To make sure that the analyzer
measures only the light coming from the LED, the analyzer should be supplied with zero
air. The optic test should produce a PMT signal of about 2000±1000 mV. To activate
the electrical test press the following touch screen button sequence.
SAMPLE RANGE = 500.0 PPB NOX=X.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
DIAG SIGNAL I / O
NEXT ENTR EXIT
DIAG OPTIC A1:NXCNC1=100PPM NOX=XXX.X
<TST TST> EXIT
SETUP X.X ENTER DIAG PASS: 818
8 1 8 ENTR EXIT
Press NEXT until…
DIAG OPTIC TEST
PREV NEXT
ENTR EXIT
Press TST until…
DIAG ELEC PMT = 2751 MV NOX=X.X
<TST TST>
EXIT
While the optic test is
activated, PMT should be
2000 mV ± 1000 mV
Note
This is a coarse test for functionality and not an accurate calibration tool.
The resulting PMT signal can vary significantly over time and also
changes with low-level calibration.