Apparatus for determining the pressure of capillary water, espec

Details Apparatus for determining the pressure of capillary water, espec Apparatus for determining the pressure of capillary water, espec

1983-07-19

1985-06-04

Woodiel, Donald O.

Measuring and testing

Moisture content or absorption characteristic of material

73 38, 73726, G01N 1910

Patent

active

045206570

ABSTRACT:
The apparatus for determining the pressure of capillary water in the ground, especially in soil, is of a two-part design and comprises a probe tube and a pressure measuring device. The pressure is measured by means of an elastically deformable membrane. For pneumatically coupling the pressure measuring device with the probe tube the latter is closed by a pierceable and self-sealing closure member. A hollow needle suitable for piercing the closure member is attached to the pressure measuring device. Either at or in the elastically deformable membrane there are arranged mechanical-electrical transducers which can be connected to an electric measuring and evaluation instrument for indicating the pressure which corresponds to the deformation of the membrane.

REFERENCES:
patent: 3049914 (1962-08-01), Richards
patent: 3930413 (1976-01-01), Laird et al.
patent: 4361047 (1982-11-01), McMullen et al.

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