Digital Piezometer
This is a Casagrande-tip standpipe piezometer for boreholes and observation wells, built from perforated PVC with an internal filter element for corrosion resistance and long-term reliability.
- Dimensions
- 40.6 mm O.D. x 345 mm
- Filter material
- Spun nylon, 70 micron pore diameter
- Permeability
- 3 x 10⁻⁴ m/s (low air entry)
Overview
In detail
How it works
The Casagrande tip comprises a perforated PVC body around an inner spun-nylon filter element with a 70 micron pore size, giving a permeability of 3 x 10⁻⁴ m/s (low air entry). It connects to lengths of 25NB PVC pipe and is installed in a borehole within a sand response zone, sealed above with bentonite and backfilled to surface.
Standpipe piezometers with Casagrande tips suit high-permeability soils where time-lag and high-volume displacement are not critical.
Reading
Water level in the PVC standpipe is read using a water level indicator (dipmeter) or Water Whistle, and used to calculate piezometric pressure or groundwater level. Standpipes subject to artesian groundwater can be fitted with a Bourdon-type pressure gauge instead.
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Specifications
Technical specifications
- Dimensions
- 40.6 mm O.D. x 345 mm
- Filter material
- Spun nylon, 70 micron pore diameter
- Permeability
- 3 x 10⁻⁴ m/s (low air entry)
- Weight
- 0.150 kg
- Filter area
- 245 cm²
- Pipe connection
- 25NB PVC pipe
Related
Often specified alongside
Geosystems
Vibrating Wire Piezometer - VWP
- Range
- 0.0352, 0.0702, 0.2, 0.35, 0.5, 0.75, 1, 1.5, 2, 3, 5, 7 MPa
- Accuracy
- ±0.1%
- Linearity
- < ±0.5% F.S.
Geosystems
Standpipe Piezometer CP1, CP15
- Type
- Porous plastic filter (CP1: perforated rigid PVC body; CP15: crush-resistant)
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