page 5
CDTX-90-1 System Power/Loop Connections
Stand-alone application, no current loop used
Transmitter
4
3
2
1
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
Power Supply
DC 12 - 24 V
Power
Supply
Power
Supply
Connection to a PLC with built-in power supply
PLC
Power Supply
Ground
Power
Supply
Loop Input
4-20 mA
Loop Input
4-20 mA
Internal PLC
Connection
Connection to a PLC/Recorder, separate supply
PLC or Recorder
Loop Input
4-20 mA in
Loop Input
4-20 mA in
DC 12 - 24 V
Power
Supply
Power
Supply
Example: Two transmitters connected to PLC/Recorder
with separate power supply
Transmitter 2
4
3
2
1
DC 12 - 24 V
Power
Supply
Power
Supply
Transmitter 1
4
3
2
1
Transmitter
4
3
2
1
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
Transmitter
4
3
2
1
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
Sys. Pwr.
Loop -
Sys. Pwr.
Loop +
AUX
Power -
AUX
Power +
PLC or Recorder
Channel 1
4-20 mA in
Channel 1
4-20 mA in
Channel 2
4-20 mA in
Channel 2
4-20 mA in
Terminals
Terminals
Terminals
Terminals
-
+
-
+
-
+
-
+
-
+
-
+
-
+
AUX power required for all CDTX-90 systems.
CDTX-90-1 Terminal connections
Output -
System Pwr
Loop -
System Pwr
Loop +
4
3
2
1
6
5
Sensr Gnd
(SHIELD)
Iso. Gnd
(BLACK)
Temp. IN
(WHITE)
Signal IN
(RED)
10
9
8
7
AUX
Power -
AUX
Power +
Terminals 5-6: Open-collector Output
•
A transistor output, programmable (see CALIBRATE menu) as High or Low setpoint with
adjustable hysteresis and proportional pulse (to 400 pulses per minute maximum).
•
May be disabled (Off) if not used.
Terminals 3 and 4: Loop Power
12-24 VDC
±
10% system power
and current loop output.
Max. loop impedance:
50
Ω
max. @ 12 V
325
Ω
max. @ 18 V
600
Ω
max. @ 24 V
Internal open-collector
output circuit
Output --
Output +
Isolation
15
Ω
S
D
Terminals 1-2: Auxiliary power
Provides DC power to measurement
circuit. Required for all CDTX-90
systems.
Terminals 7-10: Sensor input
7 is conductivity input
8 is temperature input
9 is the isolated signal ground
10 is the sensor earth ground
Summary of Contents for CDTX-90 Series
Page 18: ...page 18 Notes ...
