84.2 Sensor positionThe optimum position to install the sensor is with the electrodes in the side of the pipe. Thisway, air pockets at the top of the pipe are avoided.Downstream, the minimum recommended distance to a disturbing element is 5 x DN.4.1.1 MixturesIf liquids of different conductivities are mixed it is necessary to install the sensor a minimumof 50 x DN from the point of mixture in order to obtain a uniform conductivity of the liquidand stabilize the readings.If this distance is shorter, readings may be unstable.4.3 ValvesControl valves or shut-off valves should always be installed downstream from the sensor toassure that the pipe is always full of liquid.