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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
7-24
Table 7-14: Automatic Calculation of Converter Efficiency
Step Number Action Comment
1. Press
CAL-CONC-
CONV-NO2
From the SAMPLE mode the M200AU 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 M200AU 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 M200AU will now compensate all readings for this
converter efficiency value.