Keller DCX data loggers for hydrostatic level measurements

Keller offers probes to monitor groundwater levels and filling levels in tanks that can be used under a wide range of conditions. The probes provide fully autonomous operation or they can be used with an integrated data logger, wireless transmission (GSM), ambient pressure-compensating capillary or a separate absolute pressure sensor. Probe diameters of 16, 18 and 22 mm are available.

The DCX-16 can be used in locations where every millimetre counts. The product, which is screwed into position and fully watertight, operates as an autonomous battery-powered data collector with an absolute pressure sensor. In shallow water, a barometer can be used for separate recording of the barometric pressure on the surface. The differential pressure and/or the filling level are then calculated in the PC by subtraction of the time-stamped measurement data from the individual loggers.

The fully welded DCX-18 is designed as an autonomous level logger for long-term measurements of level and temperature, with rechargeable accumulator-type batteries. The microprocessor electronics compensate for linearity and temperature deviations by the pressure sensor. Different operating modes, with an absolute pressure sensor or an overpressure sensor with a pressure-compensating capillary, can also be supplied. The measurement data are stored in a nonvolatile memory. The batteries are fast-charged every time data are extracted via the charging/read-out plug.

DCX-22 AA level loggers register and compensate for fluctuations in the local barometric pressure with a watertight air pressure sensor that is fitted on the top end of the sounding tube. The devices are resistant to conditions of use in a damp environment and will not be damaged by brief flooding. The electronic equipment registers the signals from the high-precision pressure and temperature sensors, corrects linearity or temperature deviations according to a mathematical model and records the values to the internal memory. The built-in battery has a lifetime of 10 years.