3
8850-3 Conductivity/Resistivity Transmitter
3.2 System Power/Loop Connections
Stand-alone application, no current loop used
Transmitter
Terminals
Power
Supply
12 to 24 VDC
Connection to a PLC with built-in power supply
Internal
PLC Connection
Connection to a PLC/Recorder, separate supply
Example: Two transmitters connected to PLC/Recorder with separate power supply
-
+
PLC or Recorder
Loop 2 -
Loop 2 +
System Power Loop 1 -
System Power Loop 1 +
AUX Power -
AUX Power +
6
5
4
3
2
1
Transmitter
Terminals
Loop 2 -
Loop 2 +
System Power Loop 1 -
System Power Loop 1 +
AUX Power -
AUX Power +
6
5
4
3
2
1
6
5
4
3
2
1
Transmitter
Terminals
Loop 2 -
Loop 2 +
System Power Loop 1 -
System Power Loop 1 +
AUX Power -
AUX Power +
Loop 2 -
Loop 2 +
System Power Loop 1 -
System Power Loop 1 +
AUX Power -
AUX Power +
6
5
4
3
2
1
6
5
4
3
2
1
Loop 2 -
Loop 2 +
System Power Loop 1 -
System Power Loop 1 +
AUX Power -
AUX Power +
Power
Supply
12 to 24 VDC
-
+
PLC or Recorder
Channel 3
4 to 20 mA in
Channel 4
4 to 20 mA in
-
+
-
+
Transmitter 1
Terminals
Transmitter 2
Terminals
PLC Terminals
Channel 1
4 to 20 mA
+
-
Power
Supply
12 to 24 VDC
Channel 2
4 to 20 mA
+
-
-
+
Channel 2
4 to 20 mA
+
-
Channel 1
4 to 20 mA
-
+
Channel 1
4 to 20 mA in
Channel 2
4 to 20 mA in
+
-
+
-
Power
Supply
12 to 24 VDC
-
+
NC
NC
AUX power required for all 8850 systems
1mS
1M
Ω
10mS
100K
Ω
1,000mS
10,000mS
50,000mS
200,000mS
100mS
10K
Ω
400,000mS
100,000mS
0.054mS
18.3 M
Ω
Bottled
Water
Brackish Sea Water
(Salinity)
UPW @ 25°C
USP
Cooling Tower
Waste Waters
Deionization Regen. Chemicals
Alkali Cleaners, Acids/Bases
Rinse
Water
3-2819, 3-2839
(0.01 Cell)
3-2820, 3-2840
( 0.10 Cell)
3-2821, 3-2841
(1.0 Cell)
3-2822, 3-2842
(10.0 Cell)
3-2823
(20.0 Cell)
0.010mS
100 M
Ω
200mS
Select the sensor with the range that best straddles your
application requirements.
• 2818-1, 2839-1 (0.01 cell):
0.01 to 100
μ
S/cm
(10
k
Ω
to 100 M
Ω
)
Use the 2818-1 or the 2839-1 for all resistivity requirements
• 2820-1, 2840-1 (0.1 cell):
1 to 1000
μ
S/cm
• 2821-1, 2841-1 (1.0 cell):
10 to 10,000
μ
S/cm
• 2822-1, 2842-1 (10.0 cell):
100 to 200,000
μ
S/cm
• 2823-1 (20.0 cell):
200 to 400,000
μ
S/cm
