Instruction Manual 2009
Rev 3
DFS2 Doppler Flow Switch
2
Connections
Sensor
:
Connect the sensor to the 4-way terminal
plug as indicated in Figure 1 Terminal No’s 9
to 12.
Power Input
:
Check that the operating voltage of the flow
switch is correct, (i.e. 24Vdc, 115Vac or
230Vac) before connecting the power supply.
Relay
:
The relay has a changeover contact, which
can be used for pump control, or simply to
initiate an alarm condition. The single control
relay will operate when the flow measured is
outside the high or low trip settings and can
be configured to operate with or without
“latch”.
Latch Selection
:
JP2 Position 1 – ON (latch/reset)
•
Relay energised in normal conditions
i.e. between high and low limits giving
a failsafe mode.
•
In alarm condition the relay will
deenergise and latch in the
deenergised position.
•
Close reset contact (7 & 8) to reset
relay to energised position. Resetting
will also reset timer T2.
•
If alarm condition remains after T2
timer times out the relay will again
deenergise and latch.
•
If used for pump protect either power
the DFS2 from the pump circuit or
close reset contact allowing normal
flow conditions to be established
before T2 timer times out.
Position 2 – OFF (No latch/reset)
•
Relay is deenergised in normal
conditions i.e. between high and low
limits.
•
In alarm conditions the relay will
energise.
