Hycontrol Ltd V1.5
Page 6
However, if a plastic tank is used, then an earth electrode is required in the liquid. An
electrode may be a simple stainless steel rod or pipe which is partially immersed in the
liquid. This should be connected using a wire to earth as shown in figure 4 with the sensor
cable screen also connected to earth/ground. Alternatively the earth electrode can be
connected directly to the sensor process fitting as shown in figure 5. If a metal pipe is in
contact with the liquid this may be used in place of an electrode
.
It is essential that a return path is connected for the measurement to work correctly.
Return via
ground Network
metal ground electrode
Plastic Tank
Figure 4 – Plastic tank
With return path using a ground
electrode and the network ground.
Figure 3 – Metal Tank
With return path via
ground network.