Omega CDTX-90 Series User Manual page 5

CDTX-90-1 Terminal connections
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
System Pwr
4
Loop -
System Pwr
3
Loop +
AUX
2
Power -
AUX
1
Power +
Terminals 1-2: Auxiliary power
Provides DC power to measurement
circuit. Required for all CDTX-90
systems.
CDTX-90-1 System Power/Loop Connections
Stand-alone application, no current loop used
Transmitter
Terminals
Sys. Pwr.
4
Loop -
Sys. Pwr.
3
Loop +
AUX 2
Power -
1
AUX
Power +
Connection to a PLC/Recorder, separate supply
Transmitter
Terminals
Sys. Pwr.
4
Loop -
Sys. Pwr.
3
Loop +
AUX
2
Power -
AUX 1
Power +
AUX power required for all CDTX-90 systems.
6
Output -
5
Output +
Internal open-collector
output circuit
S
D
Isolation
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.
Power Supply
DC 12 - 24 V
Power
-
Supply
Power
+
Supply
DC 12 - 24 V
Power
-
Supply
Power
+
Supply
PLC or Recorder
-
Loop Input
4-20 mA in
Loop Input
+
4-20 mA in
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
10
9
8
7
15Ω
Output --
Output +
Connection to a PLC with built-in power supply
Transmitter
Terminals
Sys. Pwr.
4
Loop -
Sys. Pwr. 3
Loop +
AUX 2
Power -
1
AUX
Power +
Example: Two transmitters connected to PLC/Recorder
Transmitter 1
Sys. Pwr.
4
Loop -
Sys. Pwr.
3
Loop +
AUX
2
Power -
AUX 1
Power +
Transmitter 2
Sys. Pwr.
4
Loop -
Sys. Pwr.
3
Loop +
AUX
2
Power -
AUX
1
Power +
Sensr Gnd
(SHIELD)
Iso. Gnd
(BLACK)
Temp. IN
(WHITE)
Signal IN
(RED)
PLC
Terminals
Power Supply
-
Ground
Power
+
Supply
-
Loop Input
4-20 mA
+
Loop Input
4-20 mA
Internal PLC
Connection
with separate power supply
DC 12 - 24 V
Power
Supply
Power
Supply
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
page 5