Teledyne 300M - Manual (Page 102)

Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
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 11.3.
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 11.2.
10.5.6 Cannot Span or Cannot Dynamic Span
1. Check for leaks in the pneumatic systems as described in Section 11.3.
2. Check for a dirty particulate filter and replace as necessary as described in Section 11.2.
3. Check for dirty pneumatic system components and clean or replace as necessary.
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.
10.6 Troubleshooting Individual Sub-Assemblies and
Components
The following sections provide troubleshooting/check-out methods for the specific sub-
assemblies and components of the analyzer.
10.6.1 Troubleshooting Flow Problems
When troubleshooting flow problems, it is a good idea to first confirm actual flow of the
analyzer. If available, use an independent flow meter rotameter or mass flow meter to measure
flow(s). Sample flow can be measured at the sample inlet port at the instrument's rear panel. If no
independent flow meter is available, placing a finger over an inlet port and feeling for a vacuum
will at least give an indication whether flow is present.
If the independent flowmeter shows to be correct, check the pressure/flow sensor assembly as
described in Section 10.6.8.
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