Prelog PDL

Advantages

Pressure measurement from vacuum to overpressure
Recording of pressure curves, for example, compressed air supply and remote water networks
Logging of measured values in the heating and ventilation technology
Tightness checks
Record levels of tanks
Highly accurate and overload resistant capacitive ceramic measuring cell
Front flush capacitive ceramic membrane: no deposition or contamination
For relative, vacuum and absolute pressure measurement
Very high accuracy and long term stability
Long battery life due to lithium battery for at least 2 million measurements or 10 years
All stainless steel
Non-volatile data memory for up to 216 000 measurements
Easy readout of collected readings by laptop or handheld PC
Application description

The pressure transmitter with data logger Prelog PDL is a battery powered system for autonomous measurement and
registration of pressure in pipelines and containers.

The excellent characteristics like highest strength against pressure and pressure blows, high resistance against chemicals and corrosion, very good insensitiveness against temperature shocks and EM interference, highest accuracy and long term stability as well as low influence of temperature makes it possible to use the sensor in various fields with liquids like water, waste water, solvents, oil, sludge, grease, cleaning agents, etc., where levels and temperatures combined with date and time should be surveillanced without having any auxiliary power at the place of installation.

Because of an intelligent store management the internal data memory with a size of 64kB resp. 128kB allows a recording of minimum 21 600 up to maximum 216 000 measurement data sets at exclusive storage of the pressure measurement.
A highly efficient lithium battery that is integrated in the probe ensures the power supply of the device.
The battery life time is conceived for minimum 2.000.000 measurements. This equals a run time of minimum 10 years at a measurement rate of 1x per 3 minutes.

Because of many possibilities of adjustment a highest flexibility in the application for control level and especially for pumping test or long term surveillance is given.

Function description

The liquid contacts directly the ceramic membrane and causes there a deflection of the membrane because of the hydrostatic pressure of the liquid.

At the maximum deflection the membrane contacts a robust ceramic carrier and because of this, the membrane come through over pressure of e.g. 40-times of nominal load at a sensor with a pressure range of 0…1 m water column without damage.

The hydrostatic pressure signal of the ceramic membrane is measured by the integrated high-resolution digital electronic according to the adjusted measurement rate and is stored loss protected.

Because of an intelligent store management the internal data memory with a size of 64kB resp. 128kB allows a recording of minimum 21 600 up to maximum 216 000 measurement data sets at exclusive storage of the pressure measurement signal.

A highly efficient lithium battery that is integrated in the probe ensures the power supply of the device.
The battery life time is conceived for minimum 2.000.000 measurements. This equals a run time of minimum 10 years at a measurement rate of 1x per 3 minutes.

Integrated over voltage protection modules prevents the destruction of the pressure sensor caused by atmospheric influences like e.g. thunder strike.