Teledyne 356WA instruction manual Symptom Cause What To Do

	Trace Oxygen Analyzer		Maintenance & Troubleshooting 5
Symptom			Cause		What To Do
Cell lacks sensitivity (contin-		Faulty humidity control (contin-		•	Turn humidifier control
ued.)			ued.)		completely counter-
					clockwise.
				• Turn on main power.
				•	While watching the
					voltmeter, turn the
					humidifier control clock-
					wise; the meter reading
					should go from 0–50
					milliamps. If not, replace
					the humidifier heater
					element or the humidifier
					heater control. To deter-
					mine which should be

replaced, see paragraph below.

If there is no current, either the humidifier element or control is defective. To determine which it is:

• Turn the humidifier control knob fully ccw.

• Disconnect the voltmeter from TS1-5 and orange wire. Reconnect the orange wire.

• Change the voltmeter function to 200V AC.

• Place the voltmeter across TS1-5 and termi- nal TS1-4.

• Watching the meter, turn the humidifier control knob cw and watch the voltmeter read 0–110 to 120V AC.

• If not, replace R2 (behind the control knob); see paragraph below.

• If there is voltage, replace

the heater element; see paragraph below.

Teledyne Analytical Instruments 5-9