How To Measure Conductivity Of Water

All Aquaprobes incorporate an electrical conductivity (EC) sensor for measuring in various applications including groundwater, surface water and sea water. We have a wide range of Aquaprobes to best suit your needs, which can be found over on our product page.

If you are new to water monitoring, this page will give you a look into how to measure conductivity of water with Aquaread’s dedicated equipment.

All of our Standard Electrodes are incredibly sensitive. The EC electrode is capable of measuring between 0 – 200 mS/cm, which means that the electrode is able to detect changes in conductivity with great precision.

Conductivity (EC) Range 0 – 200 mS/cm (0 – 200,000 µS/cm)
Resolution 3 Auto-range scales: 0 – 9999 µS/cm, 10.00 – 99.99 mS/cm, 100.0 – 200.0mS/cm
Accuracy ± 1% of reading

The EC sensor is made from 4 stainless steel rings which measure the ability of the water to pass a small current between the rings.

The EC sensor is combined with our dissolved oxygen sensor, seen in the example below.


The Aquaprobe sleeve plays an important role in EC measurement as it forms part of the EC cell. The sleeve must always be fitted when calibrating and using the instrument.

There are different options for calibrating the EC sensor depending on what kind of water you plan on testing. For fresh water testing we recommend that you use Rapidical which calibrates the EC at 2570uS. If you are testing in the sea you can calibrate with the 12.88mS calibration solution or you can use our 35ppt salinity solution which is sodium chloride based for a more representative calibration for salt water applications.

Calibrating the probe

  1. The EC electrode requires Rapidical Calibration, using rapidical solution (RC600) to ensure data is captured correctly. It should also be calibrated as close to 25ºC as possible.

  2. Dispense the solution to about half way in the vessel provided, place the sleeved probe inside and tap on the bottom to dislodge any air bubbles.

  3. Turn the Aquameter on, and allow a minute or so to stabilise. Press Menu, scroll down to ‘Calibration’ and press OK on the ‘RapidCal’ option. Press OK, and options will be displayed to set the zero point for EC.Screen Shot 2017-01-13 at 14.17.03

  4. After calibration, press OK and check what your probe is reading – it should be around 2570µS/cm.

Logging options

Our Aquaread packages are come with a GPS Aquameter for portable data collection. We also manufacture a variation of data logging devices to ensure you can collect your data for analysis, whichever way you need. Take a look at these on our Logging Options page.

Get in touch with Aquaread today

Find out more about how to measure Dissolved Oxygen in water or get further support by getting in touch with us via our contact form on this page or giving us a call on +44 8442 221 206. Full details are available on our contact page.

Download one of our comprehensive product manuals for more instructions and information on our DO measuring equipment.

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