What is the difference between ECb and ECw values from my substrate sensor? Mirjam Bekker Bekker July 20, 2020 09:56 Updated ECb (bulk) is the Electrical conductivity the sensor senses inside the material (hence bulk). ECp (pore) is a calculation of the expected Electrical Conductivity of the water when it is extracted from the pores of the material (pore water). Related articles My ECw seems to be quite off for my substrate sensor How to rename a sensor How to turn our platform into an app How to set and display sensor notifications How do I charge my sensor? Comments 1 comment Sort by Date Votes Fokko Visser July 15, 2020 14:51 When creating widgets you will see 4 metrics, VWC , Temperature, ECb and ECw The sensor measures ECb (Bulk EC) as a raw value. Bulk EC is the electrical conductivity of the bulk soil (soil, water, and air). Sensors installed into the soil all measure bulk EC. The industry standard or what EC usually referenced is ECw (Pore EC), Pore water EC or soil water EC is the electrical conductivity of the water in the soil pores. To do this tiny sensors would have to be inserted into microscopic water-filled pores. Obviously, it’s not possible to measure the EC of water on that scale. In fact, the only way to measure pore water EC is by extracting a soil water sample and measuring the EC of that sample. We use equations to calculate the pore water EC (ECw), this is done by taking the VWC & ECb values. Please note that your calibration and VWC figures will impact the ECw output value. If the VWC is below 25% then the ECw reading is not accurate, so we have chosen not to display this figure on your charts. So if you find breaks in your ECw charts, this is because of the low VWC reading. 1 Please sign in to leave a comment.