KELLER Pressure GmbH
About
KELLER Pressure AG, founded in 1974 by physicist Hannes W. Keller (inventor of the integrated silicon measuring cell) and now led by his sons Tobias and Michael Keller, is a Swiss family-owned manufacturer headquartered in Winterthur. The company produces over 1.3 million piezoresistive pressure measuring cells annually at its headquarters, where the entire value chain from component production through calibration to final inspection takes place. All products carry the Swiss Made quality seal, and the company holds ISO 9001 certification with full traceability to national standards. The product portfolio spans pressure ranges from 5 mbar to 2,000 bar across seven categories: pressure transducers (isolated measuring cells as OEM components), pressure transmitters (signal-conditioned 4-20mA and digital output devices), level probes for hydrostatic water level measurement in groundwater wells, reservoirs, and open channels, data loggers for autonomous long-term recording of pressure and temperature, digital pressure gauges for portable and panel-mounted verification, wireless solutions enabling remote monitoring of distributed water infrastructure via LoRa and cellular networks, and custom-engineered solutions for demanding applications. With 14 branches across Europe, Asia, and the USA and over 500 employees from 20 nations, KELLER serves water and environment, oil and gas, aviation, automotive, HVAC, and food/pharmaceutical industries. A new 10,000 sq m production facility is under construction with planned opening in 2026.
Key Products
Convert fluid pressure into electrical signals for precise pressure monitoring in water systems, industrial processes, and hydraulic applications.
Provide standardized output signals (4-20mA, digital) for pressure measurement integration into SCADA and control systems in water and wastewater plants.
Submersible pressure sensors for continuous water level measurement in groundwater wells, reservoirs, tanks, and open channels.
Battery-powered devices that autonomously record pressure, level, and temperature data over extended periods for unattended hydrological and environmental monitoring.
Portable and panel-mounted instruments displaying real-time pressure readings with digital accuracy for field and plant verification.
Radio and cellular-connected monitoring systems enabling remote, real-time data transmission from level probes and pressure sensors in distributed water networks.
Engineered-to-order pressure measurement assemblies tailored to specific application requirements in specialized water and industrial environments.
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