Valeport Ltd © 2019
0803805i - Model 803 ECM
Page 8
2. Installation and Operation
2.1. Hardware
2.1.1. Physical Installation
The EM sensor should be mounted in free flow and the X and Y axes are normal to the stem. The sensor has
a flat surface on the Titanium sensor end cap, indicating that flow from that direction is Y +ve. The
instrument should be positioned with this flat edge facing forwards. The flat edge takes the place of the
polished mark or painted dot in diagram below.
The approximate measurement volume for the sensor is a cylinder projecting from the face of the sensor, of
diameter 90mm (approximate electrode spacing), and height of 45mm. These dimensions should be taken
into account when deploying the sensor.
The rear face of the sensor is fitted with an earthing ring for the EM system and should not therefore be
covered in paint or tape.
If a sensor has been stored out of water for some time, when it is re-immersed the readings may take a few
minutes to settle while the electrode contact with the water stabilises.
