1112 - Wireless Conductivity Pack
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Operational Overview
The diagram below shows the specific parts of the sensor. Read further to explore the functionality of
each part of the sensor.
The conductivity Electrode
The conductivity electrode has two carbon plates of known size facing each other across a cell of a
known width. The relationship between the electrode size and the separation is used to create the K
value. For the supplied electrode, the K value = 1. If you used a different electrode with a different K
value, the output values would not be correct.
1 = The temperature sensor used for temperature compensation.
2 = The cell
3 = The carbon electrodes
Measurement procedure
If possible, soak the tip of the Conductivity electrode in deionised water for about 30 minutes to
make sure the electrodes are clean. If not, rinse the tip thoroughly with deionised water before
use.
Wipe the outer part of the electrode body with a clean paper towel. Shake vigorously to remove
any droplets from the cell chamber. If possible, wash the tip in a sample of the solution to be
tested.
Place the Conductivity electrode in the sample to be tested. The sample must be at least 3 cm
deep to ensure the cell chamber is fully submerged.
Stir the solution gently to get rid of any air bubbles that could be trapped in the cell chamber. Wait
for 10 seconds to allow the readings to stabilize.
Note: If you are taking readings in a solution that has a temperature below 10ºC or above
35ºC, allow more time for the readings to stabilize.
If the value is above, below, or near to the maximum or minimum value in the current range, alter
the selected range of the Sensor.
Clean thoroughly when testing is complete to avoid any contamination when the electrode is next
used.
User calibration
The sensor is calibrated to the design specification, which assumes a known separation of the carbon
plates, a known area for the plates, and a known current across the cell. It is understood that
manufacture and tolerances can change one or more of the expected parameters.
If the sensor gives a result that is far out (the conductivity readings are most accurate over the middle
section of each range), it can be calibrated.
You will need two solutions of known conductivity (purchased or made to one of the many recipes
available on the internet).
In devices, click on the calibrate button and place the electrode into the lower known solution, follow
the on-screen directions. The calibration only applies to the range selected. It is best to use a known
that is midway to the range being calibrated, for example use knowns of 50 -80 us on the 0 – 100us
range.
