SWISS PRECISION BENEATH THE SURFACE – AUTONOMOUS AND LONG-TERM STABLE
KELLER Pressure Level Probes –
Accurate Measurement at Every Level
KELLER Pressure offers submersible measuring probes for precise level and fill level measurements for a wide variety of liquids and applications. Specially designed housing and cable, tailored to the specific environment, allow for dependable operation under challenging conditions.
All piezoresistive level probes are developed, manufactured and calibrated at the headquarters in Winterthur, and uphold a tradition of Swiss quality and precision that has proven itself time and again.
Universal and Precise
KELLER Pressure Level Probes
Highest Accuracy
KELLER Pressure Level Probes
Intrinsically Safe
KELLER Pressure Level Probes
Stand-Alone and Battery-Powered
KELLER Pressure Level Loggers
Telemetry
KELLER Pressure Remote Transmission Units
KELLER Pressure – Swiss Made Quality
Outstanding Long-Term Stability
KELLER Pressure level probes meet the highest Swiss quality standards and offer years of maintenance-free operation with consistent performance.
Maximum Compatibility
KELLER Pressure level probes offer all common interfaces for optimal configuration and communication. Products with an SDI-12 interface are particularly suitable for battery-powered, remote-controlled systems in the environmental and water industries.
Highest Accuracy
KELLER Pressure level probes offer maximum measurement accuracy. For example, with a measuring range of 10 mH2O, this corresponds to a maximum measurement deviation of 5 mm (0,05 %FS).
Wireless Solutions
KELLER Pressure offers high-quality, autonomous data loggers (ADT1-Box and ADT-Tube) with NB-IoT, 3G/4G/5G and LoRa connectivity, and a battery life of up to 10 years.
Customised Products
KELLER Pressure offers a wide range of configurations and bespoke products:
- Customised cable lengths
- A wide variety of materials: e.g. Hastelloy or titanium for corrosive or harsh environments
- Integrated CTD sensor for conductivity measurements (36XW-CTD)
- Special Kynar® diaphragm for wastewater or abrasive media (26KyX)
- Enhanced lightning protection for probes (X-Line 26/36)
Industries
KELLER Pressure level probes are used in a wide range of industries:
KELLER Pressure Unplugged
- Ideal for remote measuring points
- Easy installation
- Wireless data transmission
Remote Transmission via the Internet
Measuring points for groundwater or water level monitoring are often located in remote or hard-to-reach areas, such as in the open countryside or near open bodies of water. KELLER Pressure offers both water level loggers with short-range wireless interfaces and remote transmission systems for IoT networks such as LoRaWAN, NB-IoT or GSM.
Measured values can be recorded, visualised, and efficiently managed through the «PressureSuite Cloud» web app, which also provides extensive configuration options for your devices.
HYDROSTATIC MEASUREMENTS
The most common form of electrical level measurement in industrial applications is hydrostatic pressure measurement.
Hydrostatic pressure is the pressure exerted within a stationary fluid or gas as a result of gravitational force. The weight of the fluid acts on the lower layers beneath it, due to its own mass. Neither the type of medium nor whether the fluid is in motion plays a role here. Dynamic pressure due to flow is not recorded.
Hydrostatic pressure can be measured in an open or free container, body of water or closed tank subject to positive or negative pressure. In each case, ambient pressure is factored in when determining the actual fill level. For closed containers, the pressure of the gas enclosed above the liquid must also be accounted for. This is done by means of an additional pressure measurement with a second transmitter, typically screwed into the side of the tank.
The following formula can be used to calculate the hydrostatic pressure while factoring in ambient pressure: p(h, po) = ρ x g x h + po
