Infrared Pyrometers / Hot Metal Detectors

Infrared pyrometers are infrared thermometers for various applications in industrial processes. They measure the temperature at a (small) spot on a surface. Hot-metal detectors are infrared switches and also detect the infrared radiation, but do not emit a temperature but a switching signal in case of temperature exceedance or undershot.

Pyrometers are available in different spectral ranges, the choice depends on the material to be measured. Thus, metals are measured in short-wave spectral ranges, non-metals usually in the long-wave.

Three-part graph showing the available spectral ranges of the pyrometers. Link to the detail page of 1-color pyrometers

The series M3 / H3 / C3 and Sirius measure in the shortwave range, the series Metis is available in different spectral ranges. Since many of the available spectral ranges can be used in different areas, we recommend a personal advance consultation before you decide on a device.


Sorting to Measuring Technology

The measurement method decides on the intended use. –> read more

Visualized 1-color pyrometer, shows beam path on one detector.

1-color pyrometers (standard infrared thermometers) can be used to determine most of measurement object temperatures very well. Only the emissivity of the material to be measured has to be taken into account during the measurement, but it is widely known for most materials and can be read out from tables. Measuring errors are extremely low with such devices.

Visualized two-color pyrometer, shows beam path on two detectors.

2-color pyrometers measure in two different spectral ranges simultaneously and determine the temperature from the ratio of the two radiation intensities.
Thus, measurements through polluting lenses or smoke or dust are possible if the radiation ratio remains constant, i.e. a signal attenuation has the same effect on both wavelength ranges.

Visualized high-speed pyrometer, shows beam path on two detectors and an internal flash for high-speed clarification.

High-speed pyrometers measure temperatures many times faster than our other devices, very fast anyway. This can be used e.g. to create detailed temperature profiles of fast-moving parts or implement control processes that must keep a required temperature level. High-speed pyrometers are available as 1-color and 2-color pyrometers.

By Far the Best Measure

The non-contact temperature measurement with pyrometers is the contact measurement superior in many areas. However, often questions arise that can not be solved due to lack of experience. There is the spectral range that must be selected suitable to the material, the response time to the speed of a passing material or any interference at the site of installation has to be considered.
Let advise you individually when the measurement task raises too many questions.
We are interested in the long and trouble-free operation of our products at your measurement tasks.

Product overview, front page.

Get further information in our product overview (pdf) about pyrometers, calibration sources, software and accessories as well as helpful selection criteria and our services.