Teledyne GFC 7001E User Manual download pdf (Page 267)

Troubleshooting & Repair Model GFC7001E Carbon Dioxide Analyzer

Teledyne Analytical Instruments 267

13. TROUBLESHOOTING & REPAIR

This contains a variety of methods for identifying the source of performance problems with the analyzer. Also

included in this are procedures that are used in repairing the instrument.

NOTE

UALIFIED PERSONNEL

The operations outlined in this section must be performed by qualified maintenance

personnel only.

CAUTION

ENERAL SAFETY HAZARD

Risk of electrical shock. Some operations need to be carried out with the

instrument open and running.

Exercise caution to avoid electrical shocks and electrostatic or mechanical

damage to the analyzer.

Do not drop tools into the analyzer or leave those after your procedures.

Do not shorten or touch electric connections with metallic tools while operating

inside the analyzer.

Use common sense when operating inside a running analyzer.

13.1. GENERAL TROUBLESHOOTING

The GFC 7001E/EM Carbon Monoxide Analyzer has been designed so that problems can be rapidly detected,

evaluated and repaired. During operation, it continuously performs diagnostic tests and provides the ability to

evaluate its key operating parameters without disturbing monitoring operations.

A systematic approach to troubleshooting will generally consist of the following five steps:

1. Note any WARNING MESSAGES and take corrective action as necessary.

2. Examine the values of all TEST functions and compare them to factory values. Note any major

deviations from the factory values and take corrective action.

3. Use the internal electronic status LED’s to determine whether the electronic communication channels are

operating properly.

Verify that the DC power supplies are operating properly by checking the voltage test points on the relay

PCA.

Note that the analyzer’s DC power wiring is color-coded and these colors match the color of the

corresponding test points on the relay PCA.

4. SUSPECT A LEAK FIRST!

Customer service data indicate that the majority of all problems are eventually traced to leaks in the

internal pneumatics of the analyzer or the diluent gas and source gases delivery systems.

Check for gas flow problems such as clogged or blocked internal/external gas lines, damaged seals,

punctured gas lines, a damaged / malfunctioning pumps, etc.

5. Follow the procedures defined in Section 13.5 to confirm that the analyzer’s vital functions are working

(power supplies, CPU, relay PCA, keyboard, PMT cooler, etc.).

 See Figure 3-4 for the general layout of components and sub-assemblies in the analyzer.

 See the wiring interconnect diagram and interconnect list in Appendix D.

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Teledyne GFC 7001E User Manual Page 267