Bath Temperature is not maintained constant.
- check Impeller motor, belt.
- check heater lamps and temperature
control circuit.
- check thermoelectric cooling unit.
- ambient temperature is outside bath control
limits (4°C, -2°C.).
Conductivity cell contamination.
- inspect and clean cell.
Leakage between sample circuit and bath.
- check cell and tubing connections,
especially at heat exchanger and
conductivity cell side arms and ends.
Bath Temperature Shift.
- checks as in step 1.
- check thermistors, use Temperature
Sensor control to see if control points differ.
Conductivity cell contamination
- check as in step 1.
Zero shift in circuitry.
- check zero, both with Function control and
distilled water - discrepancy indicates zero
shift - check and or recalibrate conductivity
circuit board.
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