306WA - Analog trace oxygen analyzer - Teledyne Analytical ...

5.0 Maintenance & TrouboubleshootingModel 306WASymptomCell lacks sensitivity (continued.)CauseFaulty humidity control(continued.)d) Cell compartment not atproper temperature(104 °F).e) Faulty triac temperaturecontrol circuit.What To DoTo replace humidifiercontrol:• Shut off all power andremove the AC powercord from the powersource.• Refer to upper right-handcorner of the control unit.Remove the wiring andcontrols. Replace R2 withappropriate part, P/N P31(115VAC), P/N R1212(220VAC).To replace humidifierheater element:• Shut off all power andremove the AC powercord from the powersource.• Refer to left-hand side,bottom of the cell compartment.• Using Allen wrench size5/64 to remove Allenscrew from the bottom ofthe humidifier column; pullout the heater element,and unsolder the wires.• Replace with new heaterelement (P/N R991 for115VAC or P/N R1211 for220VAC) Solder wires,and replace heaterelement.d) Verify that the power switchis ON.Check condition of 2A fuse.e) • Turn off the power.Remove the power fromthe power source, unplugthe temperature controlboard. Remove the cellcompartment cover. Referto Interconnection diagram.• Connect voltmeter (set torange 20k ohm) toterminals 1 and 2 ofterminal strip TS4.5-12TELEDYNE ELECTRONIC TECHNOLOGIESAnalytical Instruments