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Temperature Sensors and Transmitters

Contact and non-contact temperature measurement, from RTD probes and transmitters to IR pyrometers and kiln monitoring.

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A temperature sensor measures process, room or surface temperature by contact (RTD, thermocouple) or without touching the surface (infrared). This page covers the full range: RTD probes, transmitters, infrared pyrometers, a digital switch, calibration tools and kiln and busbar monitoring systems, from Calex, Produal, Pixsys and Seli, for everything from a room thermostat to a cement kiln.

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42 Products · Temperature

Selection guide

Temperature Sensors and Transmitters Guide

Contact or non-contact temperature sensor?

Check first if the sensor can reach the medium directly.

  • Contact: if it can reach the medium, a contact sensor is usually cheaper and more accurate. RTD temperature probes suit accurate, stable readings up to a few hundred °C, in industrial, sanitary or HVAC-building versions, wired for 3-wire or 4-wire connection.
  • Non-contact: if the sensor can't touch a moving part, a very hot surface, a live-electrical joint or a hard-to-reach spot, choose an infrared temperature sensor / pyrometer instead, covering -40 to 2000 °C across simple, display and networked models.

Sensor, transmitter or monitoring system?

Once you've picked contact or non-contact, match the rest of the instrument chain to the job.

FAQ

Common questions

Should I choose an RTD or a thermocouple for temperature measurement?

RTDs, such as our Pt100 and Pt1000 probes, are more accurate and stable for temperatures up to a few hundred °C. Thermocouples cover much higher temperatures and respond faster to change. For most process and building work up to a few hundred °C, an RTD is the better default choice.

What is a Pt100 and how is it different from a Pt1000?

A Pt100 is a platinum RTD with a resistance of 100 Ω at 0 °C. A Pt1000 has 1000 Ω at 0 °C, which reduces the effect of cable resistance over a longer run, so it's a better choice where the transmitter or panel is some distance from the sensor.

When should I use an infrared sensor instead of a contact sensor?

Choose infrared when you can't or shouldn't touch the surface: moving parts, very hot process surfaces, live-electrical joints or hard-to-reach spots such as a kiln shell. A contact RTD or thermocouple is generally more accurate when you can safely reach the medium, so it stays the first choice there.

Can you supply NABL-calibrated temperature sensors?

Yes, our industrial RTDs can be supplied with NABL or non-NABL calibration, depending on your quality system's requirement for a nationally accredited certificate. Tell us which certification your process requires when you order, and we'll confirm the right calibration option with the probe.

What's the difference between a temperature transmitter and a digital temperature switch?

A temperature transmitter converts a sensor's signal to a 4 to 20 mA loop for a PLC to read; it has no local display or switching. A digital temperature switch, like the Pixsys DST100, adds a local display and two switching outputs to that same transmitting function, in one device.

Do you monitor temperature for kilns or switchgear as a system, not just a sensor?

Yes. Our kiln shell and under-tyre monitoring systems use multiple infrared sensors and a PM180 hub to track a rotating kiln shell continuously, and our busbar temperature monitoring does the same for switchgear joints, all logging and alarming through Modbus rather than a single point reading.

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