KELLER Home » ITS » Temperature measurement » Application solutions » Building materials » Application Concrete Mixing Plants

Description of the application

In concrete mixing plants the temperature is measured at the chute of the mixer immediately before loading the concrete on trucks. Especially for security concrete used for the construction of bridges, tunnels, etc., the processing temperature must lie within prescribed ranges. The measured temperature is documented to allow later verification, if required.

Advantage / benefit

To carry out temperature measurements at concrete mixers a measuring system is needed that withstands rough ambient conditions. It is the aim to monitor the temperature of the mixture during loading with a device that needs no maintenance and assures process reliability. The temperature is documented and serves as proof of quality during the production process.



Pyrometers are ideal devices to capture the temperature of the flowing material. Without contact and from a safe distance they detect the infrared radiation emitted from the material and calculate
the temperature.

Standard pyrometers, especially their lenses, are at risk of being damaged by aggressive vapours and dust. The infrared thermometer CellaTemp PK18 was especially developed for measurements at asphalt and concrete mixing plants. It is housed in a stainless steel case and is equipped with a special lens. The extremely resistant lens surface offers a high level of protection against contamination by aggressive dusts. Installed in the mounting assembly PK01-014 with optimised flow characteristics, a lens purging system and a supplementary tube, the thermometer guarantees safe temperature measurements for many years to come.

When properly operated, the measuring system works wear-free and need no maintenance The integrated digital display in the infrared thermometer is very useful during commissioning and maintenance.

The insulation tube PS 01/K is designed for thermal/refrigeration and electrical insulation of the measuring system from the complete installation. The analogue output signal of 0(4) – 20 mA transmits the measurement readings to the PLC.


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Building materials

Concrete Mixing Plants

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Temperature measurements at the chute of concrete mixers.

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