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NATM pressure cell

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

The instrument is supplied with the transducer connected straight to the cell plate with a valve and rilsan tube allowing it to be re-pressurized by a special pump. The re-pressurizing is required when the sensitive plate no longer touches the element whose pressure must be measured.

The cell is used for controlling radial and tangential pressure on tunnel linings and for monitoring the pressure in foundations, dams and bridges.

It can also be used for measuring the pressure exercised in the drilling or for checking the pressure exercised between a retaining construction and squeezing rock.

TECHNICAL FEATURES
ELECTRICAL PRESSURE TRANSDUCER

  • Type of sensor: piezoelectric;
  • Measuring range: 6-10-20 MPa;
  • Output signal: 4-20 mA;
  • Overpressure: 2x F.S.;
  • Electrical power supply: 8-28 VDC;
  • Accuracy: +/- 0.1% F.S.;
  • Resolution: infinite;
  • 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: 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.;
  • Resolution: 0,025% 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

DIMENSIONAL SPECIFICATIONS

Dimension plate Shape Material
150×250 rectangular stainless steel
150×150 square stainless steel
200×50 rectangular stainless steel
350×350 square stainless steel
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