Hycontrol Ltd V1.5
Page 5
3.1) Indicators
There are two indicators in the head to show the status. These can be seen in the
diagram above.
1. Green – Power on.
2. Amber – On when no foam is present. Off when foam is measured.
4) INSTALLATION
4.1) Installing the Sensor in a Tank
The sensor can be installed in a closed tank by connecting with the 3/4” BSP fitting. If the
sensor needs to be sealed into the tank, the fitting should be sealed by using PTFE tape or a
sealing compound. Alternatively the sensor can be fixed by a bracket over an open tank.
Fit the sensor in a position where the foam will come into contact with it. However it should
not be too close to metal structures (e.g. baffles or tank wall) as a “bridge” of foam can stick
between the sensor and the structure and cause false alarms. Ensure 50mm of clearance
exists between the end of the sensor and any other metal parts.
The sensor should be connected with a 4-core screened cable. The cable carries the power
(24V dc) as well as the sensor output and in some cases the earth/return signal. See figure 1
for connections.
The sensor requires a return path for the measurement to work correctly. If the foam is
measured in a metal tank, the return can be an earth/ground connection. If a plastic tank is
used then a separate electrode in the water may be required or a connection to metal
pipework can be used.
The easiest return path is simply the screwed fitting in connection with the metal tank which
provides a return path though the sensor. (See figure 2) Alternatively the return can be
connected via the cable screen and the earth nnetwork. (See figure 3)
Figure 2 – Metal tank
Direct return via
fitting
SmartFoam fitting
Connects to metal tank
To provide return path.