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Appendix 5 - Pocket TDS Sensor (Engineer's Kit Only)
TDS Factor Setting
The factory default TDS factor is 0.71. You can
adjust the TDS factor to suit different samples
of your applications. To change TDS factor:
1 Make sure the tester in measurement mode. Press
HOLD key to bring the tester to the HOLD mode.
2 Press INC or DEC key to enter the TDS factor
setting mode.
3 The upper & lower displays of LCD show the
last configured TDS factor. The upper display is
adjustable. Use the INC or DEC key to adjust the
TDS factor. The adjustable range is 0.4 to 1.0.
4 Wait for 5 seconds for the tester to automatically
confirm the new setting by displaying 'CO' and
return to the measurement mode.
Temperature Calibration
Temperature calibration need not be performed
every time, unless the temperature reading
differs from that of an accurate thermometer.
If temperature calibration is performed,
Conductivity/TDS calibration is mandatory.
1 Make sure the tester is in measuring mode.
If required, press °C/°F key to select the
desired unit of measurement for temperature
(Celsius or Fahrenheit).
Dip the tester into a solution of known
temperature and allow time for the
temperature reading to stabilise.
2 Press INC or DEC key to bring the tester to
the calibration mode. 'CAL' indicator appears
in LCD. Immediately press °C/°F key to switch
to the temperature calibration mode.
3 The upper display shows the measured
temperature reading based on the last set offset
(if any) and the lower display shows the default
(uncalibrated) temperature reading based on
factory settings. Use INC and DEC keys to adjust
the upper temperature reading to the known
temperature value of the solution.
4 Wait for 5 seconds for the tester to
automatically confirm the temperature
calibration value by displaying 'CO' and
return to the measurement mode.
Changing Batteries
Unscrew top casing to expose
the battery compartment.
Replace with 4 'A76' button
cell batteries, noting polarity.
Replace top casing.
Error Codes
• Er.0 - temperature calibration is out
of range. Use solution from 0-50°C
• Er.1 - pH calibration solutions are out
of range. Replace buffers with fresh.
If problem persists replace pH electrode
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