Apure RP-3000 - Back Contact Function; Terminal Wiring Instructions

3.2 Back contact function
POWER
RS485 D+(B)
D-(A)
G
RS485 D+(B)
D-(A)
G
2
+
-
2
+
-
1
+
-
1
+
-
+
-
+
-
4/20mA
4/20mA
±12V
AC
INPUT
POWER
HI LO
PH/
ORP
PH/
ORP
TT
TP
TP
SG
GLASS
REF
POWER
RS485 D+(B)
D-(A)
G
2
+
-
1
+
-
+
-
4/20mA
4/20mA
±12V
AC
INPUT
POWER
HI LO
PH/
ORP
T
TP
TP
SG
GLASS
REF
3.3 Terminal wiring instructions
1 2 3 8 9 14 15 16 17 18 19 20
L NC N + - + - TP TP NC
4 5
REL2
6 7
REL1
REF Glass REF
AC220V 485
A B
4-20mA
P2
4-20mA
P1
12 1310 11
P2 P1
Glass
P1 P2
1, 3: AC 220V
2: NC: no need
4, 5: REL2 Second alarm control, external relay
6, 7: REL1 First alarm control, external relay
8: Max485-A: Communication A contact
9: Max485-B: Communication B contact