Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2
5-22
3. SELECT RANGE
The range selection is the same with dilution as with normal monitoring. See Section 5.3.4 for
information on range selection. You should note however, the value entered should be the actual
concentration of the calibration gas entering the dilution probe. The units of this number is ppm.
4. CALIBRATION
When the above selections have been made, the instrument now must be calibrated through the
dilution probe.
NOTE
Units are now in PPM. See Section 7.1 for calibration methods.
5.3.4.6. Concentration Units
The M200AH can display NOX concentrations in ppm or mg/m3 and if equipped with the
Oxygen Sensor option, displays O2 concentrations in %. To change the current NOX units press
SETUP-RANGE-UNIT. Select PPM or MGM, then press ENTR. Remember, you should now
reset the expected span concentration values in the new units and re-calibrate the instrument
using one of the methods in Section 7. The following equations give approximate conversion
values. The exact values depend on the standard temperature and pressure used by your
regulatory agency.
NO ppm x 1.34 = NO mg/m3
NO2 ppm x 2.05 = NO2 mg/m3
NOTE
Changing units affects all of the RS-232 values, all of the
display values, and all of the calibration values.
Example:
If the current units are in ppm with the span value at 400 ppm, and
the units are changed to mg/m3 the span value is NOT re-calculated
to the equivalent value in mg/m3. Therefore the span value now
becomes 400 mg/m3 instead of 400 ppm. Re-enter the expected
span concentrations in mg/m3 units and recalibrate.