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Micro-Epsilon has expanded its range of non-contact infrared temperature sensors to include a compact infrared ratio temperature sensor (ratio pyrometer).

The Thermometer CT ratio pyrometer is suitable for measuring the temperature of metals, metal oxides, ceramic or semiconductor materials in harsh, high-temperature environments, including metal casting, welding, forming and sintering.

The fibre-optics ratio pyrometer measures temperatures from 700 up to 1,800C.

The sensor functions according to the ratio principle and is insensitive to contaminants such as dust, smoke or steam that may partially obstruct the target.

Even in cases where the infrared radiation beam is weakened to 95 per cent of its original intensity due to smoke or steam, the ratio pyrometer still provides faultless measurements.

The pyrometer operates on the two-channel measurement principle: two integrated infrared detection channels with relatively close spacing, but with mutually different measuring wavelengths, produce two independent electrical signals.

These signals depend on the infrared radiation emitted from the target and signal components, which are influenced by the optical transmission path between the object and the pyrometer or from changes to the object.

By taking the ratio of the two signals, the ratio-pyrometer principle eliminates (or averages out) any signal parts that are similar in both channels.

The measured temperature of the object therefore only depends on the signal ratio and the emissivity ratio, or ‘slope value’.

The ratio thermometer principle provides accurate results when measuring the temperature of objects with unknown or changing emissivity, assuming that the emissivity ratio is not changing over time or temperature.

The compact sensor head of the ratio pyrometer has a diameter of 25mm and a length of 70mm, enabling it to be mounted into tight, restricted spaces in production lines and machines.

A fibre-optic cable connects the optical sensor head to the electronics.

The optics and the cable can be used in ambient temperatures of up to 250C without the need for additional cooling.

By using a fibre-optic cable, the device is insensitive to electromagnetic interference (EMI) normally found in induction-based heat-treatment processes.

Rapid temperature measurements with response times of 5ms can be achieved.

An optical resolution of 80:1 with a selectable focus, in combination with built-in laser aiming, enables accurate measurements from a spot size of 1.3mm.

In order to adapt the sensor to different measurement tasks, the pyrometer offers a choice of a one- or two-channel (ratio-pyrometer mode) device.

Typical applications include the temperature control of inductive heating coils, temperature measurement of the pouring stream on casting machines during the reheating of steel ingots and steel billets in forging processes, in general soldering and welding processes and in process steps in semiconductor production and in photovoltaics.

The electronics enable the programming of the sensor, display of temperature measurements and wiring of the analogue outputs 0/4-20mA and 0-5/10V for the transmission of signals into industrial control cabinets.

Micro-Epsilon offers an optional integrated Profibus DP interface or other plug-in digital interfaces including USB, RS232, RS485 or Ethernet and software that provides graphical interface and display, the logging of temperature readings of all output channels and signal characteristics over time.

The user can also configure parameters and set up alarms such as ‘dirty lens’ alarms.

The standard focus of the lens is 60mm and an additional variable focus lens can be provided, which enables the user to set the focal point of the lens between 65 and 300mm.


With over 45 years experience and more than 15,000 customers worldwide, Micro-Epsilon understands the need for accurate, robust, intelligent sensors and measurement systems.

With over 45 years experience and more than 15,000 customers worldwide, Micro-Epsilon understands the need for accurate, robust, intelligent sensors and measurement systems.

If you are measuring any type of displacement / position, temperature, speed or colour parameters, Micro-Epsilon sensors and systems provide market-leading performance, together with the fastest measuring rates, highest operating temperature ranges and smart interface capabilities. From simple, low cost sensors to high volume, customer-specific OEM solutions, Micro-Epsilon will have athe correct measurement solution for your application.

Using both contact and non-contact measurement techniques, Micro-Epsilon boasts one of the largest ranges of displacement sensors including 1D, 2D & 3D laser optical, confocal chromatic, eddy current, capacitive, inductive, draw-wire and time-of-flight technologies. Measuring ranges are from nanometers to kilometers!

For temperature measurement, there is a comprehensive range of non-contact infrared temperature sensors and thermal imaging cameras capable of measuring up to that include intelligent software packages to support configuration, analysis and management during the application. LED analysers, fibre optic sensors and Colour recognition sensors measure true colour using L*A*B and CIE.

Micro-Epsilon sensors are used throughout almost all industries: from automotive to aerospace, motorsport to metal production, semiconductor to subsea. Whether it’s an R&D, test, inspection, OEM or a process control application, Micro Epsilon measurement engineers can provide the right measurement solution.

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