Innovative infrared temperature sensors and power conversion solutions


At this year’s show, Calex Electronics will launch the new ExTemp intrinsically safe infrared temperature sensor for hazardous areas. This sensor is rated for ATEX and IECEx Zones up to and including Zone 0.

The ExTemp series of infrared pyrometers is available with four set temperature ranges from -25°C to +1000°C.

All models have a two-wire 4-20 mA output, and the configurable models have an adjustable optional separate USB interface which provides the user with a range of monitoring features.

The USB interface comes with free Windows software where the sensors adjustable settings can be controlled. This includes the emissivity setting, 4-20mA temperature range, averaging, peak and valley hold processing and reflected energy compensation.

The sensor is available with cable lengths from 5 metres up to 25 metres. Other options include mounting brackets, an air purge collar, calibration certificate and laser-sighting tool.

PyroMini 2.2

The all new PyroMini 2.2 non-contact temperature sensors detect infrared radiation at wavelengths between 2.0 and 2.4 microns. This short-wavelength method of measurement allows much greater accuracy, and improved tolerance of optical obstructions or errors in emissivity setting, than longer-wavelength sensors.

Its miniature sensing head measures just 18 mm x 45 mm, making it ideal for mounting in tight spaces. A high ambient version is capable of withstanding temperatures of up to 180°C without water or air-cooling, allowing significant energy and cost savings to be made. Manufactured from stainless steel 316 and sealed to IP65, the PyroMini sensing head is ideal for steel rollers and many other metal surfaces. A wide selection of optics allows the PyroMini to focus on small or large targets at short or long distances.

Temperature ranges from 100 to 2000ºC depending on the model selected.

The special low-noise interconnecting cable is resistant to interference from movement, making the sensing head ideal for mounting on robot arms. It can be supplied in lengths from 1 m to 30 m.

The electronics module is also available with a number of different options:

The backlit touch screen interface provides a large, bright display of the measured temperature in digital format and a graph view that shows the history of the measured temperature. It also enables full configuration of the sensor including temperature range, adjustable filtering, peak or valley hold processing, emissivity setting and reflected energy compensation. In alarm conditions, the whole display changes colour to provide an immediate and obvious alarm indication. Alarm modes and levels can be configured via the touch screen.

When fitted with a MicroSD card, the PyroMini also functions as a data logger, providing a useful means of recording process temperatures for quality assurance and traceability. The user can select the sample rate and the number of samples to be taken and schedule the data logging to start at a certain time. With a 2 GB card, the user can store 28.4 million time and date stamped readings, which provides almost 1 year’s worth of data at the fastest possible sample rate of 1 per second.

Output options include 4 to 20 mA, RS485 Modbus and alarm relays, which are rated 24 V DC so there is no need for a separate trip amplifier.

Other options include mounting brackets, an air purge collar, protective lens cover and laser-sighting tool.

PyroSight E

The new PyroSight E series of infrared pyrometers from Calex Electronics is available with built-in through-the-lens laser sighting, and temperature ranges from -25°C to 2000°C.

All models have a two-wire 4-20 mA output and an adjustable emissivity setting via two rotary switches.

A choice of measurement wavelengths is available for a wide range of applications:

0.9 µm models allow reflective metals such as iron and steel to be measured more accurately than with any other measurement wavelength. This wavelength is ideal for applications including steel manufacturing, welding defect detection and furnace temperature monitoring.

1.6 µm models allow metals to be measured accurately at temperatures as low as 300°C.

5.1 µm models are ideal for measuring glass surface temperatures while minimising the effect of reflections.

8 to 14 µm models are ideal for general-purpose measurements of the temperature of paper, plastics, rubber, food, tarmac, and organic materials, for example in leaf temperature monitoring in greenhouses.

For further information, please contact Anthony Smith by telephone (01525 373178/8538009) or e-mail

For more information, please telephone Anthony Smith on 01525 373178, email or visit our website at

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