You should consider ROI potentiometer transmitters. Because they let you use potentiometers with spare PLC 4-20mA inputs for temperature measurement.
Potentiometer transmitters
The ROI-RPT series is a versatile family of loop powered 4-20mA potentiometer transmitters, because the signal range is scalable to alternate resistance spans within sensor range, and the supply voltage range is from 7.5 to 36Vdc. As well as the output circuit is reverse connection protected and filtered.
When you have spare PLC 4-20mA inputs, and need to add position measurement, use the ROI-RPT transmitter. Because the ROI-RPT transmitters allow the simple measurement of industry standard potentiometers . They use the standard 4-20mA signal. So you can easily connect your existing potentiometers to modern control systems. They are a simpler way to add position measurement to a PLC than other types. Potentiometers are simpler to use than other position sensors. Because potentiometers are easy to install, they are useful in HVAC systems, refrigeration systems, chillers, environmental monitoring, computer room monitoring, dryer, and a variety of other applications.
When you need simple to use 4-20mA 2 wire loop powered position transmitter, use the ROI-RPT. In other words potentiometer 4-20mA transmitters are a simple way to add position measurement to a PLC.
Specifications
PLUGGABLE EURO ELECTRICAL CONNECTORS
SNAP ON MOUNTING BASE FOR DIN RAIL OR SURFACE MOUNTING
WIDE 4-20mA LOOP SUPPLY RANGE FROM 7.5-36V
USED IN REMOTE MONITORING
MEASURE 10K OHM INDUSTRY STANDARD POTENTIOMETER POSITION SENSORS
READ TRANSMITTER WITH PLC, RTU, PC A-D SYSTEMS
USE WITH 20mA, 5V, 10V MEASUREMENT SYSTEMS *
MOUNTING: 35mm DIN rail or surface mountable snap on base
SUPPLY RANGE: 7.5 TO 36Vdc
SIGNAL OUTPUT: 4-20mA ( LOOP POWERED )**
CONNECTIONS: 30-12awg wire
INPUT RANGE: 0-1K, 0-2K, 0-5k, or 0-10K ohms
INPUT TYPE: potentiometer resistance
RESPONSE: 10ms
DIMENSIONS: 9.8 X 1.75 X 6.3 cm (height above rail)
* Voltage ADCs require a loop termination resistor
** 4-20mA signal uses a 2-wire connection. Connect output in series, with supply and measurement device.