Teledyne 320 Series - Portable oxygen detectors - Manual (Page 13)

3-1
Teledyne Analytical Instruments
Troubleshooting Portable Oxygen Detectors
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3.1 3.1 3.1 3.1 3.1 General General General General General
3.1.1 3.1.1 3.1.1 3.1.1 3.1.1 Erratic Reading (Meter Pointer Jumps) Erratic Reading (Meter Pointer Jumps) Erratic Reading (Meter Pointer Jumps) Erratic Reading (Meter Pointer Jumps) Erratic Reading (Meter Pointer Jumps)
Cell contacts may be dirty. Remove cell and wipe off contact area (concen-
tric metallic rings on back of cell) with a tissue moistened with water or
alcohol. Also wipe off contacts in cell holder.
If contacts are worn or corroded, replace with new contacts (see Spare
Parts List).
3.1.2 3.1.2 3.1.2 3.1.2 3.1.2 Can’t Span (Meter won’t reach CAL mark) Can’t Span (Meter won’t reach CAL mark) Can’t Span (Meter won’t reach CAL mark) Can’t Span (Meter won’t reach CAL mark) Can’t Span (Meter won’t reach CAL mark)
If the meter will not reach the CAL mark with the Span Pot in full clock-
wise position, replace cell. Return the old cell to factory if it has been in use
less than 6 months. (Possible warranty credit due).
3.2 3.2 3.2 3.2 3.2 Pump Problems Pump Problems Pump Problems Pump Problems Pump Problems
3.2.1 3.2.1 3.2.1 3.2.1 3.2.1 Pump Does Not Run Pump Does Not Run Pump Does Not Run Pump Does Not Run Pump Does Not Run
Check condition of batteries. If batteries test OK, check the voltage at the
metal wire terminals on the rear of the motor (be sure to push pump switch
9). Voltage at the pump should be about 5V.
If the voltage is OK but the pump will not run, replace the pump.
If there is not voltage at the pump, check all wiring for breaks and bad
joints.
3.2.2 3.2.2 3.2.2 3.2.2 3.2.2 Removal of Water from Pump Removal of Water from Pump Removal of Water from Pump Removal of Water from Pump Removal of Water from Pump
If water is accidentally drawn into the analyzer and gets into the pump, it
will cause excessive noise and vibration.
Water can be purged from the pump by holding the analyzer on its end with
the sample connection port pointing up. Running the pump with the ana-
lyzer in this position will drive out any trapped water.
It may be necessary to put dry filter media in filter.