Keller Series DCX-22 CTD level data loggers

With the CTD (conductivity, temperature, depth) versions of the high-precision DCX level data loggers for depths of up to 200 m, Keller offers an integrated pressure measurement solution for water management. The data logger for long-term monitoring stores over 50,000 time-stamped level measurements, as well as the associated conductivity and temperature readings. The multipurpose probes have a diameter of 22 mm, making them suitable for all sounding tubes with a nominal diameter of 1″ or greater.

The company supplies conductivity probes combined with level probes based on pressure sensors. The integrated measuring systems are suitable 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.

The 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 detecting voltage in order to measure the conductivity of the medium. For measuring conductivity, the measuring ranges of 0-200 μS/cm, 0-2 mS/cm, 0-20 mS/cm and 0-200 mS/cm, with a measuring accuracy of ±1%, can be used. Since water conductivity is temperature-dependent, a Pt1000 sensor measures the temperature of the medium directly between the electrodes to a degree of accuracy of 0.1°C.

Keller’s Logger 5.1 software is included, enabling 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. The product is able to graphically display air-pressure-compensated level curves at the same time as conductivity and temperature curves.