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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
7.8.6.1 Automatic Moly Converter Efficiency Compensation
The M200A can automatically compensate the NO
x
and NO
2
readings for the molybdenum
converter efficiency. There are 2 ways to enter the converter efficiency into the instrument. The
first is to enter the efficiency as a decimal fraction using the CAL-CONC-MOLY-SET menu.
The second method is to have the M200A compute the efficiency using the CAL-MOLY-CAL
menu. The procedure is given in Table 7-7-17 below. To disable the compensation, press CAL-
CONC-MOLY-SET and enter 1.0000 as the efficiency.
Table 7-7-17: Automatic Calculation of Converter Efficiency
Step Number Action Comment
1. Press CAL-CONC-
CONV-NO2
From the SAMPLE mode the M200A enters the Converter
Efficiency menu and requests expected NO
2
cal gas
concentration.
2. Key in expected
NO
2
concentration
Then ENTR
Enter the expected NO
2
cal gas concentration. (We suggest you
generate a NO
2
concentration of 80% of current range.)
3. Press CAL-CONC-
MOLY-SET
Set CE to 1.0000
Reset the previous converter efficiency value to 1.00.
4. Press CAL-CONC-
CONV-CAL, wait
10 min. Then press
ENTR
Allow the NO
2
concentration reading to stabilize. It may take
time for the ENTR button to appear because the only valid
values for CE are .96 to 1.02. The ENTR button will not come
on unless the value is in this range.
When ENTR is pressed, the M200A will compute the ratio of
observed NO
2
concentration to expected NO
2
concentration and
store the ratio.
5. Press SET After the instrument calculates the CE it is good practice to
check the ratio.
6. Press EXIT The M200A will now compensate all readings for this converter
efficiency value.
7-26
PRINTED DOCUMENTS ARE UNCONTROLLED