Data Acquisition & Telemetry


Keller data-logger measures CTD

September 2015 Data Acquisition & Telemetry

Keller has on offer the new data-logger, CTD (conductivity, temperature, depth) a version of the high-precision DCX level data-loggers for depths of up to 200 m. It is a highly integrated, complete pressure measurement solution for water management with a data-logger for long-term monitoring capable of storing over 50 000 time-stamped measurements.

Conductivity crucial as standard process value

Water conductivity is a measure of purity, making it an important standard process measurement in the water and sewerage sector as well as in the beverage and pharmaceutical industries. Changes in conductivity are a clear indicator of contamination, for example with particles or salts (chlorides, nitrates, etc.). Typical values lie between >50 mS (saltwater) and <5 S (pure water). Keller supplies conductivity probes combined with level probes based on pressure sensors. These integrated measuring systems are ideal for checking the ingress of seawater, slurry or fertiliser into groundwater, rivers and lakes, or for performing observation tasks relating to building projects or localised water pollution. The Series DCX 22 CTD level probes with integrated data-logger are available with a robust 316L stainless steel housing, or other materials if necessary, for enhanced chemical compatibility.

Level measurement: a core competency

Keller is a supplier of maintenance-free battery operated level probes with remote data-logger for observations at depths of up to 200 m and optional GSM module for remote access. With level measuring tolerances of 0,02%FS, Keller’s extensive portfolio ranges from data-loggers with conventional relative pressure sensors to level probes featuring two isolated absolute pressure sensors that compensate for ambient pressure deviations electrically or using software. All Series DCX-22 products are now available as CTD level probes with integrated conductivity and temperature sensor. At a rate of one measurement per hour, the integrated lithium battery has a life of up to eight years.

Conductivity probe with six electrodes

In line with Swiss quality standards for pressure sensors, the DCX-22 level measuring probes are equipped with high-precision conductivity sensors. Four platinum electrodes on the outside supply a set alternating current, while two on the inside detect voltage in order to measure the conductivity of the medium. For measuring conductivity, one of four measuring ranges with an accuracy of 1%, can be used. Since water conductivity is highly temperature dependent, a Pt1000 sensor measures the temperature of the medium directly between the electrodes, ensuring that the measured conductivity is accurately standardised to the reference temperature of 25°C.

Measuring software for long-term monitoring

Keller’s Logger 5.1 software is compatible with Windows XP or higher and is included, free of charge. This sophisticated software enables configuration of logger instruments and data download. Recorder values can be displayed in tabular or graphical form and easily sent to end users or authorities. A particularly notable feature is the ability graphically to display air pressure compensated level curves at the same time as conductivity and temperature curves.


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