The Keller DCX-25 PVDF Autonomous Data Logger is an autonomous, battery powered instrument designed to record water
depth (pressure) and temperature over long periods. The housing is made of polyvinylidene fluoride and the sensing
diaphragm is available in either Hastelloy C-276 or titanium 6AL-4V. This combination of wetted materials ensures
compatibility with even the most aggressive media.
This data collector (Ø 25 mm) integrates a pressure sensor, electronics and battery in one housing. The electronics
employ the latest microprocessor technology, which give high accuracy and resolution for the pressure and temperature
signals. The built-in pressure sensor is mathematically compensated for all linearity and temperature errors. The use
of a non-volatile memory ensures high data security.
The DCX-25 PVDF works with an absolute pressure sensor. For installation, the data collector is secured by a suspension
cable and immersed into the media to be measured and must be recovered for data readout. In shallow water, where the
influence of barometric pressure changes should be considered, it is recommended that a second data logger (e.g. DCX-22
Baro) is placed at the surface to record the barometric pressure. The Logger PC software then calculates the water depth
by subtracting the two measured values. The housing of the data logger can be opened easily without any tools, thus
allowing quick access to the replaceable battery and the interface connector for configuration and data download.
