Electrical Connection - Tecfluid VH Series Instruction Manual

5.1

Electrical connection

For the electrical installation it is recommended to use multiple conductor cables, and not
single cables, in order to guarantee the cable gland will stay watertight. The connector has a
PG9 cable gland for cables with outer diameters between 4.5 mm and 7 mm. The
numbering of the terminals is the following:
This numbering refers to the switch without flow.
Make sure that the contact rating indicated on the label at the product and in page 7 of this
manual, is not exceeded.
is not exceeded. If high loads are to be switched, use an auxiliary relay.
When using inductive loads, such as relays or solenoid valve coils, surge arresters should be
installed to protect the reed contacts.
With a DC supply, a diode should be connected as shown.
For an AC supply, a RC circuit can be used as shown, although a varistor (VDR) is better
and is easier to select the right value. The VDR should have a breakdown voltage greater
than 1.5 times the rms voltage. The standard varistor ratings specify the rms working voltage
for the varistor, for example a S05K25 varistor will be for 25 V
breakdown voltage of 39 V at 1 mA.
In the female connector:
Terminal 1: Reed contact
Terminal 2: Reed contact
Terminal 3: Not connected
Earth terminal: Earth
6
working and will have a
rms