Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2
7-14
Table 7-12: Converter Efficiency - Automatic Calculation
Step
Number Action Comment
1. Preparation Make sure a calibration is completed before setting up
Converter efficiency.
2. Press
CAL-CONC-CON-NO2 Enter the expected NO2 concentration, then press ENTR.
3. Input a known
concentration of NO2
calibration gas.
Allow reading to stabilize for 10 minutes.
4. Press CAL-ENTR By pressing ENTR the M200AH will calculate the ratio of
the observed to expected NO2 and will use that ratio to
compensate future NO2 readings. The calculated value can be
seen by pressing the SET button.
NOTE: The CAL button will come on only if the Instrument is
measuring NO2 gas and ratio is between the limits of 0.80 - 1.20.
5. Press EXIT EXIT will return instrument to SAMPLE mode.
Method 2. If the converter efficiency is determined by some external means, the value can be
directly entered. Press CAL-CONC-CON-SET, then key in the ratio and press ENTR, then
EXIT.
7.12. Recommendations for CEM Applications

7.12.1. Calibration Gasses

The following is our recommendation for calibration gasses and equipment for the M200AH.
Regulator Specifications:
Ultra high purity, two-stage stainless steel body with stainless steel diaphragms, Tefzel and
Teflon seats and seals, CGA 660 type. Gauges are 0-4000 psig inlet with 0-100 psig outlet.
Nitric Oxide Calibration Gas specifications:
Use NO in nitrogen, EPA protocol 1, NIST traceable (long lead item, order early) for CEMS
Certification Test gas and acid rain applications.
Use NO in nitrogen at 80% of calibration range 2% for routine calibration.
Example: Order 80 ppm NO in N2 if calibrating the 0-100 ppm range.