PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
PRO-series Model E3 Electrodeless Conductivity Transmitter
2
+
1
2
3
4
5
6
7
-
Loop Resistance
(See nomograph)
Jumper Required
200
0
14
16
18
RES
IS
T
A
N
CE
IN
OH
MS
800
400
600
1000
1200
1400
DC VOLTAGE
20
22
24
26
28
30
50 Ohms/Volt
LOOP LOAD
Loop Power
14-30VDC
Class 2
FIGURE 2-9
Three-wire Hookup -- Load Sourcing
RS-485 Serial
communications
"A" +
"B" -
+
1
2
3
4
5
6
7
-
Loop Resistance
(See nomograph)
Loop Power
16-30VDC
Class 2
DC VOLTAGE
1000
R
ESI
ST
ANC
E
IN
OH
MS
400
0
200
600
800
1200
1400
16
18
20
22
LOOP LOAD
50 Ohms/Volt
26
24
28
30
Shield
FIGURE 2-10
Three-wire Hookup -- Load Sourcing with RS-485 Serial Communication
3.4 Four-wire Hookups
In a four-wire hookup, the transmitter can be wired two ways
depending on whether or not RS-485 serial communication
is used. At least 12 VDC is required for operation (16 VDC
with serial communication). When using RS-485, consult
GLI for Command Set.
Depending on how the transmitter is mounted, route the DC
power, analog output, and RS-485 serial communication
wiring into the transmitter as follows:
•
Wall/Pipe-mounted Transmitter:
Route cable through
right side cable entry knockout hole in the back cover.
•
Panel-mounted Transmitter:
Route cable behind panel
to the exposed TB1 terminal strip.
