FPC-Pneumatic Piezometer
The FPC-2 pneumatic piezometer consists of a thin flexible diaphragm to which the fluid pressure is applied. During readout this pressure is balanced by an externally applied nitrogen gas pressure. Rugged, stable and accurate, the FPC-2 is suitable for use in both short term and long term monitoring programs.
- Range
- 0–1000 kPa (standard), 0–3500 kPa (high pressure)
- Accuracy (PR-20 readout)
- ±0.25% F.S. of pressure gauge
- Accuracy (PR-20D readout)
- ±0.25% F.S. of pressure transducer
Overview
In detail
How it works
The readings are obtained when the external gas pressure is equal to the porewater pressure acting on the reverse side of the diaphragm. The volume change associated with pressurization of the diaphragm is extremely small and consequently the response time is very low, even in low permeability soils as clays.
Construction and models
The design and the materials (brass or stainless steel) used in the construction of the FPC-2 make it particularly suitable for use in both short- and long-term monitoring programs where ruggedness, stability and reliability are required. An integrated filter on the input gas line prevents the entry of foreign particles into the piezometer. FPC-2 pneumatic piezometers are available with low-air or high-air entry filters. Two models are available: model FPC-2 for borehole installation and model FPC-2D to be pushed into soft soil.
Applications
Retaining walls, piles, culverts and tunnel linings; foundations (seepage and uplift); embankments and backfill; natural and cut slopes; waste disposal sites; excavations; and dams.
Reach out and say hi
Let us help. Tell us the site, the range you expect and what it has to talk to, and we’ll work out the right variant, cable and mounting — and quote it.
Specifications
Technical specifications
- Range
- 0–1000 kPa (standard), 0–3500 kPa (high pressure)
- Accuracy (PR-20 readout)
- ±0.25% F.S. of pressure gauge
- Accuracy (PR-20D readout)
- ±0.25% F.S. of pressure transducer
- Diaphragm volumetric displacement
- <0.01 cm³
- Standard construction
- Brass, stainless steel (optional)
- Filter options
- Plastic, ~50 µm, ~10 kPa low air entry (standard); stainless steel, ~50 µm, ~10 kPa low air entry; ceramic, ~1 µm, ~450 kPa high air entry
- Twin tubing
- 2 polyethylene tubes (ID: 2.5 mm, OD: 4.7 mm) under a PVC jacket
- Twin tubing (optional)
- 2 nylon 11 tubes (ID: 3.2 mm, OD: 6.3 mm) under a polyethylene jacket
- Outside diameter
- 32 mm
- Length
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)
Ready to specify?
Add FPC-Pneumatic Piezometer to your enquiry
Build a list, add your site notes, and an ESS engineer will quote the lot — cables, mounting and calibration included.
