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High-precision piezoresistive level probe
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In the high-precision level probe of the 26X series, the temperature dependence and nonlinearity are precisely compensated for in the microcontroller by means of a mathematical model. In addition to the RS485 interface, the measurement results can also be output via the integrated D/A converter as a rangeable analog signal. Extended lightning protection is also available as an option.


  • RS485 interface can be combined with an analog interface
  • Analog interface can be ranged via RS485 interface (turn-down)
  • Modbus RTU protocol for process values and configuration
  • Excellent long-term stability
  • For many years of maintenance-free operation, submerged in the mediu


  • Media isolated piezoresistive pressure sensor
  • Robust stainless-steel housing with high-quality cable gland
  • High-quality pressure transducer and tried-and-tested mathematical compensation
  • Hydrostatic pressure measurement

Typical applications

  • Level measurement: groundwater, surface water
  • Fill level measurement: water tanks, fuel tanks
  • Pressure Ranges - 0…0,1 to 0…25 bar
  • Accuracy - ±0,1 %FS
  • Total Error Band - ±0,25 %FS @ 0…50 °C
  • Interfaces - RS485, 4…20 mA, 0…10 V
  • Special Characteristics - High accuracy

For more information please click here


Data Sheet High-precision piezoresistive level probe -

PDF (1507KB)

Installation Information for Piezoresistive Pressure Transmitters & Level Probes 

PDF (157KB)

EU Declaration of Conformity 26X Declaration of Conformity 

PDF (167KB)

Control Center Series 30 Software

The Windows software ControlCenterSeries30 (CCS30) communicates with KELLER devices that are connected to the PC via an interface converter.

ZIP (13682KB)

Communication Protocol for X-Line Products

Communication protocol for X-Line pressure transmitters from KELLER using RS485 interface

PDF (982KB)

KELLER Bus / Communication Protocols and Code Samples Overview

Collection of links to information about KELLER bus and other communication protocols as well as code samples in various programming languages (C++, LabVIEW, .NET, C#, Delphi, Visual Basic, VBA, Agilent VEE) and KOLIBRI Cloud API daemon with access token (Python, C#).

PDF (982KB)