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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
2-8
Step 2 - Calibrate the instrument:
Zero/Span Calibration Procedure
Step Number Action Comment
1. Input Zero gas Allow Zero gas to enter the sample port on the rear of the
instrument.
2. Press CAL The M200AU enters the calibrate mode from sample mode.
When the CAL button is pressed, the adaptive filter is
activated. This allows the instrument to respond rapidly to
concentration changes regardless of their magnitude.
3. Wait 10 min Wait for reading to stabilize at the zero value. If you wait less
than 10 minutes the final zero value may drift.
4. Press ZERO The ZERO button will be displayed.
5. Press ENTR Pressing ENTR actually changes the calculation equations and
zeroes the instrument.
6. Input Span Gas Switch gas streams to span gas.
7. Wait 10 min Wait for reading to stabilize at the span value. If you wait less
than 10 minutes the final span value may drift.
8. Press SPAN The SPAN button should be displayed. If it is not, check the
Troubleshooting Section 9.2.8 for instructions on how to
proceed. In certain circumstances at low span gas
concentrations (<100ppb), both the ZERO and SPAN buttons
will appear.
9. Press ENTR Pressing ENTR actually changes the calculation equations so
that the concentration displayed is the same as the expected
span concentration you entered above, thus spanning the
instrument.
10. Press EXIT Pressing EXIT returns the instrument to SAMPLE mode.