Model 200AU-NOy Option Manual Addendum
4.1 Calibration or Cal Check Procedure The calibration of the instrument can be checked or adjusted using gas introduced through the
calibration port on the Bypass Pump Module. The calibration gas is routed to a TEE near the sample
inlet port on the remote converter assembly.
Since the zero gas concentration is defined as 0 ppb, it is not necessary to enter the expected zero
value. Table 4.1 details the zero calibration procedure.
Table 4.1 - Manual Zero Calibration Procedure - Zero Gas Thru Sample Port
Step
Number Action Comment
1. Press CAL The M200AU enters the calibrate mode and the adaptive
filter is activated. This allows the instrument to respond
rapidly to concentration changes regardless of their
magnitude.
2. Wait 10 min Wait for reading to stabilize at zero value.
3. Press ZERO If you change your mind after pressing ZERO, you can
still press EXIT here without zeroing the instrument.
4. Press ENTR Pressing ENTR actually changes the calculation
equations.
5. Press EXIT M200AU returns to sampling. Immediately after
calibration, data is not added to the DAS averages.
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