Teledyne API Model 200AU NOX 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 NO2 cal gas
concentration.
2. Key in expected
NO2 concentration.
Then ENTR
Enter the expected NO2 cal gas concentration. (We suggest you
generate a NO2 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 NO2 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 NO2 concentration to expected NO2 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.