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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 295
STEP 3:
To cause the analyzer to calculate and record the NO
2
NO converter efficiency, press:
Check the calculated efficiency
gain factor.
If the gain factor is NOT
between 0.9600 and 1.0200,
the
NO
2
NO converter
needs to be replaced.
M-P CAL CONVERTER EFFICIENCY MENU
NO2 CAL SET EXIT
Starting from
CONVERTER EFFICIENCY MENU
(see preceding steps)
M-P CAL CE FACTOR:1000.0 Gain
1. 0 0 0 0 ENTR EXIT
M-P CAL CONVERTER EFFICIENCY MENU
NO2 CAL SET EXIT
SAMPLE NO2 STB=XX.X PPB
<TST TST> SETUP
SAMPLE RANGE=500.0 PPB NOX= XXXX
< TST TST > ENTR SETUP
Set the Display to show
the NOX STB test
function.
This function calculates
the stability of the NO/NO
x
measurement.
Toggle TST> button until ...
Allow NO
2
gas of the proper concetration to enter
the sample port at the rear of the analyzer.
Wait until NOX STB
falls below 0.5 ppb.
This may take several
minutes.
SAMPLE NO2 STB=XX.X PPB
<TST TST> ENTR SETUP
M-P CAL CONVERTER EFICIENCY MENU
NO2 CAL SET EXIT
M-P CAL CE FACTOR=0.9852 Gain
0.8852 ENTREXIT
Toggle these
buttons to initialize
the converter
efficiency at 1.0000.
The analyzer
calculates the
converter’s
efficiency.
12.7.10.4. Evaluating NO
2
NO Converter Performance
If the converter appears to have performance problems (conversion efficiency is outside of allowed range
of 96-102%), check the following: