10K NTC thermistor to
4‑20mA transmitter,
−10 to 75 °C
Read 10K NTC thermistors with your PLC. The ROI-XMA transmitter converts the thermistor to a loop-powered 4-20mA signal, so a spare PLC analog input becomes a temperature input.
Thermistor temperature
on a standard 4-20mA input
The ROI-XMA series is a family of loop-powered 4-20mA thermistor temperature transmitters. This version reads a 10K ohm NTC thermistor over −10 to 75 °C. The output circuit is reverse connection protected and filtered.
Thermistors suit limited temperature ranges, where they can achieve higher precision than other temperature sensors. Existing 10K NTC thermistors can be connected to modern control systems without replacing the sensor.
- Pluggable Euro connectors for fast wiring and replacement
- Snap-on base for 35 mm DIN rail or surface mounting
- Wide loop supply from 7.5 to 36 V DC
- Reads into PLC, RTU and PC analog systems
- Works with 20 mA, 5 V and 10 V measurement inputs
Specifications
- Part number
- ROI-10KXMAN1075C
- Input type
- 10K ohm NTC, 2-wire thermistor
- Input range
- −10 to 75 °C
- Output
- 4-20mA, loop powered
- Supply
- 7.5 to 36 V DC
- Response
- 10 ms
- Connections
- 30–12 AWG wire
- Mounting
- 35 mm DIN rail or surface, snap-on base
- Dimensions
- 4.510 × 1.258 × 3.948 in (L × W × H above rail)
The mated connector adds 3/8 in to the height.
Two wires in, two wires out
The thermistor connects to the input with two wires. The 4-20mA output is also a two-wire connection: the transmitter is wired in series with the loop supply and the measuring input, and draws its power from the loop.
Connect to a voltage input
A loop termination resistor is required when the measuring device is a voltage ADC. A 250 Ω resistor gives 1–5 V, and 500 Ω gives 2–10 V.
Other temperature ranges
Standard 10K NTC versions are listed below. Versions can be built for thermistors from 1K to 100K ohm at 25 °C, and the output can be scaled to a custom span within the sensor range.
| Range | Sensor | Output | Details |
|---|---|---|---|
| −10 to 50 °C | 10K NTC | 4-20mA | View transmitter |
| 0 to 50 °C | 10K NTC | 4-20mA | View transmitter |
| −10 to 75 °C This page | 10K NTC | 4-20mA | ROI-10KXMAN1075C |
| 0 to 75 °C | 10K NTC | 4-20mA | View transmitter |
Where it is used
- HVAC systems
- Refrigeration and chillers
- Computer room monitoring
- Environmental monitoring
- Dryers and other limited-range process applications
- Remote monitoring
Add a thermistor to a PLC
- Mount the transmitter on DIN rail near the thermistor.
- Wire the thermistor to the two input terminals.
- Wire the loop in series with the supply and a spare PLC 4-20mA input.
- Scale 4–20 mA to −10 to 75 °C in the PLC.
Related solutions
Analog sensor signal conditioning
The full ROI-XMA transmitter line for thermistors and potentiometers.
Learn more →Multi-Channel Distributed Temperature Measurement
Many thermistor transmitters, ROI-IOM nodes and one RS-485 cable to a PC or PLC.
Learn more →4-20mA to Modbus RS-485 enclosure
Read up to four transmitters on a PC, ready-wired in an enclosure.
Learn more →Need a thermistor transmitter?
Tell us the thermistor, the temperature range and how many you need. Custom ranges and other thermistor values are available.