© RLS Wacon GmbH ∙ +49 (0)5121 28126 0 ∙ info@rls
-wacon.de
23
Connection of external components
To connect additional components, the device is equipped with an input, 2 relays and an analogue
output (current interface 4 - 20 mA). A flow switch, a potential-free switch or an electronic switch
(open collector) can be connected to the input. An auxiliary voltage of 24 VDC at terminal 17 and
GND at terminal 19 is available for the electronics. For signal detection, 24 VDC must be bridged to
terminal 18. No external voltage sources may be connected to the input. If necessary, a potential
separation must be made with a relay or optocoupler.
The connections of the relays are all brought out potential-free. For switching external devices, the
internal network voltage or alternatively an external supply voltage can be used. The connection to
external controllers is usually established via the potential-free contacts of the relays.
Figure: Schematic plan view of connection terminals
Voltage
The supply voltage connected through the device switch is applied to output
terminals 5 to 8 and can be used on the output relay in order to actuate drive
pumps, solenoid valves or other loads. The maximum total connected load to
output terminals 5 to 8 must not exceed 250 VA. The output terminals are
switched with the network switch of the analyzer and protected by the fine-
wire fuse of the device.
Relay 2 is always energised in normal
operation: COM to NO connection
(wire-break safety)
