State of the art measurement technology

Level switch measuring principle by Berthold!

Gamma radiation emitted from a shielded source irradiates the vessel at the pre-defined level height. When the level reaches this limit, the radiation is significantly weakened or totally absorbed. The strong and sudden attenuation is measured by a detector at the opposite side of the vessel and an alarm is activated.
Temperature, pressure, dust, colour or chemical properties of the product have no influence on the outcome of the measurement. Consequently this results in the high reliability and low maintenance of the radiometric measurement systems, even under harsh operating and environmental conditions.

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Simple and intuitive operation

  • Simple mounting, on the outside of the vessel
  • No contact with the material to be measured
  • Free of wear and maintenance


State of the art technology

  • Subsequent installation on existing systems possible
  • High availability and therefore high operational safety
  • Reliable measurement without recalibration

Sensitivity of our level switches

Our highly sensitive detectors achieve a better measuring effect and operate with remarkably low source activities. Depending on the application the source activity can be reduced by up to 80%.

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Detector stability

The patented method for detector stabilisation ensures a consistent measurement performance, reliably compensating temperature and aging effects. If these go unnoticed and are not compensated, they can cause considerable loss in production yields and product quality suffers.

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SIL 2 / SIL 3 certified

The cosmic radiation control also makes it possible to keep the required source activity very low. Only Berthold is able to use the LB 480 as a density or min/max level switch in SIL2 / 3 safety circuits, in addition to its use as a level field device.

More about SIL 

SpeedStar option

The product version SpeedStar is used when very fast process changes have to be recognized immediately. The SpeedStar feature ensures extremely fast response times in the millisecond range. An example application is the edge detection of steel plates to straighten their cut edges while they are being transported on the roller conveyor, or to position glowing and scorching steel blocks. Furthermore, the detection of over or under-filled liquid containers, e.g. gas tanks while they are being conveyed.

X-ray Interference Protection (XIP)

With this function, weld tests can no longer distort the measured value. The measured value is frozen until the external radiation influence is over. A digital output signals the detection of interfering radiation. All our level measurements are equipped with XIP.

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Pages of Whitepaper radiometric measurement

Whitepaper "Radiometric Measurements"

Berthold has published the whitepaper “Radiometric Measurements – Accuracy, repeatability and errors”, wherein the radiometric measurements are explained and  how your process can be performed with highest accuracy and reproducibility and the error sources can be minimized. The paper explains the nature and causes of these errors, and identifies solutions where these errors can be suppressed through the application of „best practices“ and proper design.

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Publication Made to measure in Hydrocarbon Engineering

Article "Made to measure"

You want a reliable control of your fluid catalytic cracking (FCC) process, but are uncertain about the right measurement technology because of the extreme process conditions? Read the article “Made to measure” to learn why the use of radiometric measurement systems can help to optimize level control in FCC units and how Berthold systems can help you to control your process more reliably to ensure safe operation while increasing efficiency.

 Get your copy


Continuous Level Measurement Product brochure

English | PDF | 4.9 MB

Level Switch Mini-Switch LB 471 Brochure

English | PDF | 352.5 KB

Radiometric measurement Whitepaper

English | PDF | 1.8 MB

Article made to measure Publication

English | PDF | 6.8 MB