5.3 Electrical installation
1.
Screw the orange-coloured SN6 plugs onto the sensors
2.
Plug the mains plug for the metering system into a socket
5.3.1 Install external signal inputs and signal outputs
Terminal
Description
Technical Data
XK1:1-2
Sample water monitoring*
Open circuit voltage: 15 V
Short circuit current: 1.8 mA
Minimum switching current for closed
contact: 1 mA – corresponds to a
residual voltage of approx. 6 V
Minimum switching current for open
contact: 0.02 mA
XK1:3-4
Pause input*
XK2:1-2
Level monitoring, chemicals, pH correction*
XK2:3-4
Level monitoring, chemicals, chlorine*
XE1/XE2
pH sensor
Measuring range from –505 mV ...
+505 mV; not galvanically isolated
Input resistance > 0.5 x 10
12
Ω for
potentiometric pH sensors
XE3/XE4
ORP sensor
Measuring range from +90 mV ...
+1005 mV; galvanically isolated
Input resistance > 0.5 x 10
12
Ω for
potentiometric ORP sensors
XR1
Alarm relay
max. 250 VAC,
max. 3 A,
max. 700 VA,
changeover type of contact; galvani‐
cally isolated from protective low
voltage and mains voltage
XP1: N,L, PE
Mains connection
230 VAC ±10 %, 50/60 Hz
XP2: L,N, PE
Pulse length output, metering pump, chlorine
(pump alpha, DULCO
®
flex DF2a)
The mains voltage is outputted via a
load relay:
max. 250 VAC
max. 3 A
max. 700 VA (protective RC circuit
integrated)
XP3: L,N, PE
Pulse length output, metering pump, pH lowering
(pump alpha, DULCO
®
flex DF2a)
* The digital inputs are galvanically isolated from the rest of the connection. As, however, the digital inputs
are connected to each other, they are only suitable for potential-free contacts.
5.3.2 Cable Cross-Sections and Cable End Sleeves
Minimum cross-section
Maximum cross-section
Stripped insulation length
Without cable end sleeve 0.25 mm
2
1.5 mm
2
Cable end sleeve without
insulation
0.20 mm
2
1.0 mm
2
8 - 9 mm
Cable end sleeve with
insulation
0.20 mm
2
1.0 mm
2
10 - 11 mm
Assembly
19
