FPC-2 Pneumatic Piezometer
HIGH RELIABLITY
PNEUMATIC PIEZOMETER
FOR LONG TERM MONITORING
Rugged, Stable and Accurate FPC-2 pneumatic piezometer suitable for use in both short term and long term monitoring program
The FPC-2 pneumatic piezometer consists of a thin flexible diaphragm on which is applied the fluid pressure. During readout this pressure is balanced by an externally applied nitrogen gas pressure. 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.
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.
Specifications
Range: 0–1000 kPa (standard) ,0–3500 kPa (high pressure)
| Accuracy | |
| PR-20 readout | ±0.25% F.S. of pressure gauge |
| PR-20D Readout | ±0.25% F.S. of pressure transducer |
| Diaphragm volumetric displacement | <0.01 cm3 |
| Standard construction | Brass, stainless steel (optional) |
| Filter | 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 |
| Optional | 2 nylon 11 tubes (ID: 3.2 mm, OD: 6.3 mm) under a polyethylene jacket |
| Dimensions | |
| Outside diameter | 32 mm |
| Length | 28 mm (FPC-2), 52 mm (FPC-2D) |
Ordering Info
Please specify:
- Model
- Measuring range
- Filter type
Optional accessories:
- Quick-connect and plug set for twin tubing
- Junction and switching box
- Push-rod adapter for the FPC-2D; please specify thread type
- Readout instruments: PR-20, PR-20D
