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If all the checks described in the preceding sections have been successfully performed,
the following will provide an itemization of the most common dynamic problems with
recommended troubleshooting checks and corrective actions:
10.5.1 Noisy or unstable readings at zero
1. Check for leaks in the pneumatic system as described in Section 11.2.
2. Confirm that the Zero gas is free of Carbon Monoxide.
3. Check for a dirty particulate filter and replace as necessary as described in
Section 11.1.
4. Check for dirty Sample Cell and/or pneumatic lines. Clean as necessary
as described in Section 11.3.
10.5.2 Noisy, unstable, or non-linear span readings
1. Check for leaks in the pneumatic systems as described in Section 11.2.
2. Check for a dirty particulate filter and replace as necessary as described in
Section 11.1.
3. Check for dirty pneumatic system components and clean or replace as
necessary as described in Section 11.3.
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.
10.5.3 Slow response to changes in concentration
1. Check for dirty pneumatic components and clean or replace as necessary
as described in Section 11.3.
2. Check for pneumatic leaks as described in Section 11.2.
3. Check for improper materials in the inlet manifold.
10.5.4 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 9.2 and 9.3.
10.5.5 Cannot zero or cannot dynamic zero
1. Check for leaks in the pneumatic system as described in Section 11.2.
2. Confirm that the Zero gas is free of Carbon Monoxide.
3. Check for a dirty particulate filter and replace as necessary as described in
Section 11.1.
10.5.6 Cannot span or cannot dynamic span
1. Check for leaks in the pneumatic systems as described in Section 11.2.
2. Check for a dirty particulate filter and replace as necessary as described in
Section 11.1.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 89