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Self-compensating tensiometer and method

  • US 20020112531A1
  • Filed: 02/22/2001
  • Published: 08/22/2002
  • Est. Priority Date: 02/22/2001
  • Status: Active Grant
First Claim
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1. A pressure self-compensating tensiometer to in situ determine below-grade soil moisture potential of earthen soil within a bore hole, comprising:

  • a body having opposite first and second ends and being adapted for complete insertion into earthen soil below grade;

    a porous cup material provided at the first body end, the porous material at least in part defining a fluid chamber within the body at the first end;

    a liquid received within the fluid chamber;

    a pressure transducer mounted within a transducer housing, the transducer housing having first and second ends and being immersed within the liquid;

    the transducer housing first end being opened to the liquid;

    a reference port connected between the transducer housing second end and a reference vent tube, the reference vent tube venting to the atmosphere.

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