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Appendix 5 - Pocket TDS Sensor (Engineer's Kit Only)
Before You Begin
Remove the electrode's protective cap. Soak the
electrode for a few minutes in alcohol to remove
any oil stains on the electrodes. Rinse thoroughly
with de-ionised water and shake to dry.
Press ON/OFF key to switch on the Pocket Sensor.
Range Selection
1 Switch off the Pocket Sensor. Press and
hold °C/°F key and then switch on the tester
using ON/OFF key. Release °C/°F key.
2 The LCD shows the currently selected Range (the
default is AUTO) in the lower display. The upper
display shows the maximum possible reading for
the selected range. Press HOLD key repeatedly
until you see the required range (PU, LO or HI).
Measurement
1 Press the ON/OFF key to switch on the tester.
The 'MEAS' indicator appears when the tester
is in measurement mode.
2 Dip the electrode into the test solution making
sure that it is fully immersed. Stir to clear any
trapped air bubbles from the electrode and let
the reading stabilise.
3 The upper display shows the TDS (Total Dissolved
Solids) of the solution, automatically temperature
compensated (ATC) to normalised temperature of
25°C. The lower display shows the temperature
of the solution.
Calibration
Auto Calibration
1 Make sure the tester is in measuring mode.
Press INC or DEC key to enter conductivity
calibration mode.
2 'CAL' indicator appears in LCD. The display
briefly shows 'CAL' and the number of
points the tester will be calibrated.
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3 The upper display shows the conductivity
reading and the lower display sequentially
shows calibration standard values 84 uS,
1413 uS & 12.88 mS if the measuring
range of the tester is set to AUTO.
4 Rinse the electrode with the calibration standard
that you intend to calibrate and then dip the
electrode in the other beaker with same calibration
standard. Swirl gently to create a homogenous
sample and allow time for the reading to stabilise.
5 Press HOLD/ENT key to confirm the calibration.
LCD shows 'CO' for 2 seconds.
6 For multi-point calibration, the tester goes to
the next calibration point. Rinse the electrode
in de-ionised water and repeat step 4 & 5 with
next calibration standard solution.
Manual Calibration
1 Make sure the tester is in measuring mode.
Rinse the electrode with the calibration
standard that you intend to calibrate and then
dip the electrode in the other beaker with
same calibration standard. Swirl gently and
allow time for the reading to stabilise.
2 Press INC or DEC key to enter calibration
mode. The 'CAL' indicator appears in LCD.
3 The upper display shows the measured
conductivity/TDS reading of the solution based
on previous calibration (if any) and the lower
display shows the default (uncalibrated)
conductivity/TDS reading.
Note: The tester shows error message 'Er.1':
(a) If the reading is over range (Or) of
selected measuring range of the tester, or
(b) If the default (uncalibrated) reading is not
within the acceptable calibration standard
range. Use INC and DEC keys to adjust the
upper display to the correct conductivity/
TDS value of the calibration solution.
4 Wait for 5 seconds for the tester to automatically
confirm the calibration by displaying 'CO' and
return to the measurement mode.
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