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Model 200EU-NOy Option Manual Addendum
16 05386 Rev. D
5.1 Calibration or Cal Check Procedure
The calibration of the instrument can be checked or adjusted using gas introduced through the
calibration port “CAL IN” 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 3 details the zero calibration procedure.
Table 3 Manual Zero Calibration Procedure - Zero Gas Through Sample Port
Step
Number
Action Comment
1. Press CAL The M200EU enters the calibrate mode.
2. Wait For Stability
Typ STB < 0.1 PPB
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 M200EU returns to sampling. Immediately after
calibration, data is not added to the DAS averages.
NOTE
The M200EU with the NOy Option does NOT have
equivalency approval, and may not be used for EPA
monitoring.