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Earth pressure cell

Earth pressure cell is used for monitoring the total pressure between structure and the groung.

It is installed on the base of embankments or earth fil dams, under tanks or bridges.

The pressure cell consists of 2 circular steel plates welded together around the perimeter and separated inside by a small cavity filled with special not aerated oil. The oil is connected trought stainless steel tube to an electric tranducer that converts every pressure change that acts on the cell into a variation in the electrical signal.

Every pressure’s variation on the cell make a variation of electrical signal of trasducer which is acquired by specific unis of measurement.

The pressure trasducer can be electrical with 4-20 mA output signal or vibrating wire with frequency signal output.

TECHNICAL FEATURES
ELECTRICAL PRESSURE TRANSDUCER

  • Type of sensor: piezoelectric;
  • Measuring range: 100-200-350-700 kPa, 1-2 MPa;
  • Output signal: 4-20 mA;
  • Overpressure: 2x F.S.;
  • Electrical power supply: 8-28 VDC;
  • Accuracy: +/- 0.1% F.S.;
  • Non linearity: +/- 0.1% F.S.;
  • Total thermal error: 0.04% F.S./°C
  • Long term stability: 0.1 % F.S./year;
  • Operating temperature: from -40 to 125 °C;
  • Protection class: IP 68;
  • Material: stainless steel.

TECHNICAL FEATURES
VIBRATING WIRE PRESSURE TRANSDUCER

  • Type of sensor: vibrating wire;
  • Measuring range: 345, 518, 1034 kPa, 2.1 – 3.4 – 5.2 MPa;
  • Output signal: Hz;
  • Range: from 2200 to 3500 Hz;
  • Overpressure: 2x F.S.;
  • Electrical power supply: 8-28 VDC;
  • Accuracy: +/- 0.1% F.S.;
  • Non linearity: <0.5% F.S.;
  • Total thermal error: 0.05% F.S./°C
  • Operating temperature: from -20 to 80 °C;
  • Protection class: IP 68
  • Thermistor: 3kW;
  • Material: stainless steel

CELL PLATE SPECIFICATIONS

  • dimension plate: diameter 200 mm
  • Thickness: 6 mm
  • Material: stainless steel
  • Hydraulic tube length: 135 mm
  • Hydraulic tube diameter: 6 mm
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