LTH Electronics HPT63, Operation Manual

Page: 48 / 68

14 Fault Finding
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2. Check that the correct sensor units have been selected within the
Parameters menu (see Section 7.1 Units ).
3. If the units are set to pH, check the temperature compensation state (see
Parameters Section 7.3 Temperature Input ). If the compensation is set to
Manual, check that the fixed temperature is at the correct level. If the
compensation is Automatic, check that the temperature reading on the main
display is correct.
4.
Check the sensor using a hand held meter.
The Sensor Reading Is Incorrect
♦
If reading pH, check that the correct electrode type has been selected (see
Section 7.2 Electrode Type ).
♦
Check that no error messages are being displayed (see Appendix F –
Error Messages ). Check that the sensor cable has been correctly
connected (wall-mounted version only - see Section 3.4 Connections ).
♦
Check that the Temperature reading is correct.
♦
Check the instrument calibration using a pH simulator. Adjust the user
calibration if necessary (see
Section 10 Calibration ).
♦
Use another instrument to check the sensor.
The Sensor is not Functioning Correctly
♦
Check that the sensor glass is not broken or cracked.
♦
Check the reference electrode KCl (where applicable) for leakage or
contamination.
♦
Ensure all electrode protective caps have been removed
♦
Check that any junction boxes used are correctly connected.
♦
Check that a suitable high impedance, low noise cable has been used.
♦
Check for damaged or broken cables.
♦
Check for damp, grease, or liquids near connectors, junction boxes, or
terminations.
♦
Where extension cables have been used, try connecting the sensor
directly to the instrument.
The Temperature Reading Is Incorrect
♦
Check that the temperature sensor is correctly attached. (wall-mounted
version - see
Section 3.4 Connections ).
♦
Check that the temperature sensor type is correctly selected in the
Configuration menu (See Section 12.2 Temperature Input Sensor )