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KELLER AG headquartered in Winterthur (Switzerland), is Europe’s leading manufacturer of isolated pressure transducers and transmitters. The company, which has a global workforce of around 400 employees, was founded in 1974 by Hannes W. Keller, a graduate in physics and the inventor of the integrated silicon measuring cell. The entire value creation, from production of the individual parts and calibration of the sensor through to the final inspection of the finished products, takes place at the headquarters in Winterthur. All KELLER AG products are therefore “Made in Switzerland”.

KELLER AG pressure sensors have impressively high precision and pressure ranges from 5 mbar to 2000 bar. In addition to more than 500 standard products, the company also develops and produces numerous customized solutions. Using state-of-the-art, automated manufacturing processes, large runs of industrial OEM transducers as well as special design versions in very small quantities are produced in more than 35 highly-specialized machining islands, resulting in more than one million pressure transducers and transmitters per year. The high quantities mean that the company can keep prices low despite complex production processes and stringent quality requirements.

Products manufactured by the company include: pressure intruders, pressure transmitters, level probes, data loggers, manometers, digital indicators, pressure switches and software’s/ converters.

The company’s products are found in South Africa and experts in the company indicate that the trend is clearly in the water environment control.  Therefore KELLER develops his water line of measuring and control fresh water level and waste water control.



Fisch Cornel

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