PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Rev. 0-201
PRO-series Model C3 Conductivity Transmitter
23
3.2 Two-wire Hookup
☞
In a two-wire hookup, at least 16 VDC is required for opera-
tion. A load device can be connected in the current loop
(see Figure 2-6 for details).
Depending on how the transmitter is mounted, route the DC
power/analog output 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.
•
Integral Sensor-mounted Transmitter: Route cable through
right side cable entry knockout hole in the back cover. (Do
not open left side cable entry knockout hole in cover.)
Wiring Tip!
Use high quality, shielded instrumentation cable.
5
7
6
1
3
4
2
-
Loop Power
16-30VDC
Loop Resistance
(See nomograph)
+
Jumper
Required
16
0
600
300
R
E
SIS
T
AN
C
E
IN
O
H
M
S
100
200
400
500
700
800
30
DC VOLTAGE
18
20
22
24
26
28
50 Ohms/Volt
LOOP LOAD
FIGURE 2-6 Two-wire Hookup
3.3 Three-wire Hookups
In a three-wire hookup, the transmitter can be wired four
ways depending on load “sinking” or “sourcing” and whether
or not RS-485 serial communication is used. At least 14
VDC is required for operation (16 VDC with serial communi-
cation).
Depending on how the transmitter is mounted, route the DC
power, analog output, and RS-485 serial communication
wiring into the transmitter as follows:
