Teledyne 306WA - Analog trace oxygen analyzer - Manual (Page 36)

TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
5-12
5.0 Maintenance & 5.0 Maintenance & 5.0 Maintenance & 5.0 Maintenance & 5.0 Maintenance & T T T T Trrrrroub oub oub oub oubleshooting leshooting leshooting leshooting leshooting Model 306W Model 306W Model 306W Model 306W Model 306WA A A A A
Symptom Symptom Symptom Symptom Symptom Cause Cause Cause Cause Cause What What What What What T T T T To Do o Do o Do o Do o Do
Cell lacks sensitivity (contin-
ued.)
Faulty humidity control
(continued.)
d) Cell compartment not at
proper temperature
(104 °F).
e) Faulty triac temperature
control circuit.
To replace humidifier To replace humidifier To replace humidifier To replace humidifier To replace humidifier
control
control control control control:
• Shut off all power and
remove the AC power
cord from the power
source.
• Refer to upper right-hand
corner of the control unit.
Remove the wiring and
controls. Replace R2 with
appropriate part, P/N P31
(115VAC), P/N R1212
(220VAC).
To replace humidifier To replace humidifier To replace humidifier To replace humidifier To replace humidifier
heater element
heater element heater element heater element heater element:
• Shut off all power and
remove the AC power
cord from the power
source.
• Refer to left-hand side,
bottom of the cell com-
partment.
• Using Allen wrench size
5/64 to remove Allen
screw from the bottom of
the humidifier column; pull
out the heater element,
and unsolder the wires.
• Replace with new heater
element (P/N R991 for
115VAC or P/N R1211 for
220VAC) Solder wires,
and replace heater
element.
d) Verify that the power switch
is ON.
Check condition of 2A fuse.
e) • Turn off the power.
Remove the power from
the power source, unplug
the temperature control
board. Remove the cell
compartment cover. Refer
to Interconnection dia-
gram.
• Connect voltmeter (set to
range 20k ohm) to
terminals 1 and 2 of
terminal strip TS4.