KELLER is a global leader in designing and manufacturing high-precision piezoresistive pressure sensors, submersible level transmitters, and digital manometers.
KELLER AG für Druckmesstechnik, headquartered in Winterthur, Switzerland, is renowned globally for its advanced pressure and level sensing technologies. Founded with a commitment to precision and reliability, KELLER produces a wide range of industrial instruments, including submersible level transmitters, digital manometers, and highly accurate piezoresistive pressure sensors. Through its subsidiary, KELLER America Inc., the company provides robust measurement solutions to the North American market, catering to water monitoring, environmental, and industrial sectors.
With annual sensor production exceeding one million pieces, KELLER integrates miniaturized microprocessors into their fully packaged pressure transmitters to achieve exceptional Total Error Band performance. Their product lineup features state-of-the-art intrinsically safe instrumentation and specialized digital process controllers designed to withstand extreme conditions, including hazardous environments and deep water pressures.
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For a two-part (internal+external) system, the minimum supply voltage is calculated as 11.6 + 0.022 (CABLE LENGTH x 0.07) VDC.
Yes, using an aneroid bellows results in a closed reference pressure system subject to zero shift errors induced by changing temperatures up to 0.0004 PSI/°C. It is not recommended for accuracy requirements of ±0.25% FS or better, or ranges under 2 PSI.
The battery life is approximately 1000 hours of continuous operation using a Renata CR 2430 battery.
The clear tube is filled with an indicating desiccant that extracts moisture. It must be periodically renewed as it becomes saturated, which is visually indicated by the desiccant color turning from blue (dry) to pink (saturated).