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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
9.5.4 Analog Outputs Do Not Agree With Front Panel Readings
1. Confirm that the DAC offset (SETUP-MISC-D/A-OFFS) is set to zero.
2. Perform a DAC/ADC adjustment and Dark Signal adjustment by following the procedure
described in Sections 8.2 and 8.3.
9.5.5 Cannot Zero
1. Check for leaks in the pneumatic system as described in Section 10.3.
2. Confirm that the Zero gas is free of Ozone.
3. Verify sufficient flow from the O
3
generator in excess of the total flow needed. The total flow
needed is the sum of the M401 sample flow and the remote analyzers sample flow.
9.5.6 Cannot Span
1. Check for leaks in the pneumatic systems as described in Section 10.3.
2. Check for proper operation of the Main Switching Valve and Ozone Scrubber as described in
Section 9.6.7.
3. Check for dirty pneumatic system components and clean or replace as necessary as described
in Section 10.4.
4. Check for proper adjustment of DAC and ADC electronics by performing the adjustment
procedure in Section 9.2.
5. Confirm the Sample Temperature, Sample Pressure, and Sample Flow readings are correct.
Check and adjust as required.
6. Verify sufficient flow from the O
3
generator in excess of the total flow needed. The total
flow needed is the sum of the M401 sample flow and the remote analyzers sample flow.
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