You should consider ROI 10K NTC Thermistor transmitters. Because they let you use thermistors with spare PLC 4-20mA inputs for temperature measurement.
NTC Thermistor temperature transmitters
The ROI-XMA series is a versatile family of loop powered 4-20mA thermistor temperature transmitters, because the signal range is scalable to alternate thermistor temperature 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 temperature measurement, use the ROI-XMA thermistor transmitter. Because the ROI-XMA thermistor transmitters allow the simple measurement of industry standard thermistors. They use the standard 4-20mA signal. So you can easily connect your existing 10K ohm NTC thermistors to modern control systems. They are a simpler way to add temperature measurement to a PLC than other types. Thermistors have higher precision than other temperature sensors. Because thermistors are accurate at low temperatures, they are useful in HVAC systems, refrigeration systems, chillers, environmental monitoring, computer room monitoring, dryer, and other limited temperature range applications.
When you need a 0 to 50C, -10 to 50C, 0 to 75C, or -10 to 75C 10K Ohm NTC Thermistor 4-20mA 2 wire loop powered temperature transmitter, use the ROI-XMA. In other words thermistor 4-20mA transmitters are a simple way to add temperature measurement to a PLC.
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 NTC THERMISTOR TEMPERATURE 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 to 50C, -10 to 50C, 0 to 75C, -10 to 75C
INPUT TYPE: 10K OHM NTC 2 WIRE THERMISTOR
DIMENSIONS: 11.5 X 1.2 X 10.2 cm (height above rail) LWH***
* Voltage ADCs require a loop termination resistor
** 4-20mA signal uses a 2 wire connection. Resistance transmitter. Connect output in series, with supply and measurement device.
*** Mated connector adds additional 1 cm to height.