TELEDYNE API T200U NOy, Operator'S Manual

Page: 22 / 38

Model T200U NOy Option Manual Addendum
20 07303E DCN7996
5.1 Calibration or Cal Check Procedure
Calibration of the analyzer can be checked or adjusted using gas introduced through
the CAL IN (3) port on the 501 NOy rear panel. The calibration gas is routed to a
tee fitting (see CAL IN in Figure 4), near the sample inlet on the external Converter
assembly.
Since the zero gas concentration is defined as 0 ppb, it is not necessary to enter the
expected zero value. Table 2 details the zero calibration procedure.
Table 2 Manual Zero Calibration Procedure
Step Action Comment
1. Press CAL The analyzer enters the calibrate mode.
2. Wait For Stability
Type STB < 0.1 PPB Wait for reading to stabilize at zero value.
3. Press ZERO If performing only Zero Cal Check, do not press ENTR,
press EXIT to avoid actually zeroing the instrument.
4. Press ENTR Pressing ENTR actually changes the calculation equations.
5. Press EXIT The analyzer returns to sampling. Immediately after
calibration, data are not added to the DAS averages.
Table 3 Enter Expected Span Gas Concentrations Procedure For NO & NOy
Step Action Comment
1. Press
CAL>CONC>NOy
This menu sequence causes the analyzer to prompt for the
expected NOy concentration.
Enter the NOy span concentration value by pressing the
applicable touchscreen buttons to set the expected value.
2. Press ENTR ENTR stores the expected NOy span value.
3. Press
CAL>CONC>NO
Now enter the expected NO span concentration as in step
one.
4. Press ENTR Pressing ENTR stores the NO span value and returns the
prompt to the CONC menu.
5.
Press EXIT Returns instrument to SAMPLE mode.
If desired, compensation for converter efficiency (CE) can be included in the NOy
concentration calculation. Prior to calibration, the converter efficiency should
either be set to 1.0 or determined per the procedure in the T200 manual.