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Total pressure Cell

 

The TPC cells consist of a sealed distribution pad, composed of two plates welded together around the periphery and fi lled with de-aired oil. The pad is connected via a length of steel tube to a pressure transducer. Variations in oil pressure resulting from load changes acting on the pad are sensed by the transducer. The TPC is fi tted with a circular or rectangular pad, the latter being designed for  measurement of tangential and radial stresses in shotcrete tunnel linings. The stiffness of the TPC is high, enabling its embedment in soil or in concrete. A groove on both sides of the pad increases its fl exibility while reducing sensitivity to stress in directions other than normal to the pad face. The concrete stress cell may be fi tted with a repressurization tube to restore contact between the pad and the concrete after curing of the latter.
The TPC is fi tted with eyelets, to simplify installation, and with a built-in thermistor allowing temperature reading.


Feature

  • Long-term reliability
  • High pressure range
  • Different types of transducers available: vibrating wire, electrical 4–20 mA, pneumatic and fi ber optic
  • Rugged stainless steel construction for harsh environments
  • Compliant with ISRM suggested method
  • Built-in electrical surge protection
  • Triple water block (watertight connector, resin seal and feed through header)
  • Frequency signal easy to process and transmit over long distances