Teledyne 306WA - Analog trace oxygen analyzer - Manual (Page 37)

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TELEDYNE ELECTRONIC TECHNOLOGIES
Analytical Instruments
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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.)
Calibrator slow to respond to
added oxygen.
Calibrator shows no indication.
• The DMM should read
230 to 250 ohms
(115VAC) 500 to 700
ohms (220VAC). Move
DMM to TS4 # 4&5. The
DMM should read be-
tween 7,000 to 10,000
ohms. If above test is
OK, replace the tempera-
ture control P.C. Board
• If none of the above
improve the sensitivity,
replace the cell.
a) Disassemble calibrator and
moisten the wick. See
section 4.3: Calibrator.
a) Verify that the main power
and calibrated power
switches are ON.
b) Check connectors to
calibrator.
c) Check for dry wick.
• Measure the voltage
between terminals 6 and
7 on terminal strip TS5.
• With calibrator energized,
the voltage drop across
the calibrator electrodes is
1 to 3 V. However, a dry
wick will cause voltages
as high as 25 volts.
d) Disassemble calibrator and
moisten the wick. See
section 4.3.
Faulty triac temperature control
(continued.)
a) Calibrator wick needs
wetting.
a) Lack of power, poor con-
nection, or dry wick.