Trace Oxygen Analyzer

Maintenance & Troubleshooting 5

 

 

 

 

 

 

 

 

 

Symptom

Cause

What To Do

 

 

 

 

 

Cell lacks sensitivity (contin-

Faulty triac (Q6) in heater

ued.)

control or faulty triac driver (A4)

 

(continued.)

Disconnect the thermo- switch by removing one of the wires from TS4 terminal 3. Meter should show voltage.

If voltage shows, short terminals 3 and 4 with a test jumper. Meter reading should drop to about zero (less than 10 VAC.)

If power fails to go on and off as jumper is alter- nately installed and removed between termi- nals 3 and 4, the triac or triac driver is probably at fault and should be replaced.

If power does go on and off, the thermoswitch (P/N T22) is faulty and should be replaced.

If none of the above improve the sensitivity, replace the cell.

Teledyne Analytical Instruments

5-11

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Image 33
Teledyne 356WA instruction manual Trace Oxygen Analyzer