Pyrometers

Pyrometers for infrared temperature measurement from -30 °C to 3,500 °C in industrial environments

Choose from our pyrometer series or use our product finder with over 350 pyrometers.

PX series Stationary universal pyrometer with focusable optics and IO-Link interface.

Temperature range 0 to 3000 °C

PA series Stationary universal pyrometers with focusable optics in stainless steel housing.

Temperature range 0 to 3500 °C

PK series Compact pyrometers with IO-Link interface.

Temperature range -30 to 2500 °C

PR series Compact pyrometer with IO-Link interface.

Temperature range 0 to 1600 °C

PZ series The CellaTemp PZ PROFIBUS series has been replaced by the CellaTemp PX series.

PT series Portable pyrometers for fast and accurate temperature measurement.

Temperature range 0 to 3500 °C

Mikro series Intensity comparison pyrometer for high-precision temperature control on small objects from 0.1 mm.

Temperature range 0 to 3500 °C

Measuring systems Select a measuring system specially designed for your application from our catalogue.

Accessories Accessories for operating the pyrometers even under the harshest industrial conditions.

Product finder Filter our pyrometers with your requirements.

Glossary

One-colour pyrometers

A one-colour pyrometer determines the surface temperature of an object without contact using the heat radiation emitted in a spectral range. One-colour pyrometers are also known as spectral pyrometers, radiation thermometers or infrared thermometers.

Two-colour pyrometers

A two-colour pyrometer or ratio pyrometer detects the thermal radiation of a measuring object in two different spectral ranges. The ratio of the two spectral radiance values changes approximately in proportion to the temperature. The advantages, limitations and possible applications of two-colour pyrometers are explained in our basic report.

Compact pyrometers

Compact pyrometers contain the lenses and electronics in one housing. Different objective lenses allow fixed or adjustable focus distances. Focusing and optical alignment can be checked using a laser or LED pilot light, through-the-lens sighting or video camera.

Fibre optic cable pyrometers

In a fibre optic cable pyrometer, the lenses and electronics are physically separated. A fibre optic cable transmits the infrared radiation from the measuring head to the electronics. The measuring head can be used without cooling in high ambient temperatures, electromagnetic fields or in confined spaces. A laser pilot light is used as a sighting device.

Digital pyrometers

Digital pyrometers are equipped with an integrated analog-to-digital converter (AD converter), which converts the analog signal from the infrared sensor into a digital signal. The measured value is output as an analog value and/or directly via a digital interface. The modern IO-Link communication interface has established itself here.

Intensity comparison pyrometers

An intensity comparison pyrometer or filament pyrometer is based on the visual comparison of intensity between the measuring object and a calibrated reference radiator in the device. If the colours match, the temperature value can be read off. The advantage over electronic pyrometers is the very high optical resolution. Objects as small as 0.1 mm can be detected.

Frequently asked questions (FAQ)

Is an one-colour pyrometer or a two-colour pyrometer better?

Two-colour pyrometers display the temperature of grey radiators correctly, regardless of the emissivity of the object being measured. A two-colour pyrometer is also much less sensitive than one-colour pyrometers to dust, vapour or smoke in the field of view or dirty inspection glasses.
One-colour pyrometers, on the other hand, can also detect very low temperatures from - 30 °C and are generally cheaper than two-colour pyrometers.
To select the most suitable pyrometer, each application must be checked for its specific measurement characteristics. The object to be measured, the ambient conditions and the production process must all be considered.
We will be happy to advise you personally.

Do pyrometers measure reliably in industrial environments?

Our pyrometers have been developed for industrial use. To ensure reliable measurement in harsh environmental conditions, the devices have a stainless steel housing with IP65 protection, a robust lens and shielded cables.
Protection and mounting combinations are available for additional shielding, including a cooling housing for applications with increased ambient temperatures.
For applications with increased levels of vapour, dust and smoke, the use of ratio pyrometers is suitable, as they are much less sensitive to these influences than spectral pyrometers.
In addition, there are no moving parts in the devices and the electronics are stable over the long term. This ensures a long service life for the devices.

How should a pyrometer be orientated?

The measuring field of one-colour pyrometers must be completely filled by the object to be measured to ensure error-free measurements. Correct alignment and focusing must also be observed.
With two-colours pyrometers, the measuring object may also be smaller than the pyrometer's measuring field to a certain extent.
The measuring angle to the surface normal should not exceed 60° for one-colour pyrometers and 45° for two-colour pyrometers

How fast does a pyrometer measure?

The measuring speed is indicated by the response time t90.
The response time t90 corresponds to the time in which the output signal reaches 90% of the final measured value and is usually 2 to 10 ms.

What influence does the spectral range have on the temperature measurement of a pyrometer?

The emissivity of metals increases with shorter wavelengths. Therefore, a pyrometer with a narrow-band and short-wave spectral range should be selected for precise measurement.
This spectral range also has a favourable effect on measurement accuracy, as the sensors are less sensitive to changes in emissivity.

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