Description
VW Piezometer type pore pressure meter is designed to test the pore water pressure and liquid pressure of vessel, pipe line, soft ground or embankment foundation, embankment and inside the boring hole. High accurate NTC thermistor and arrestor were mounted in order for zero compensation by change of the Temp. and also high density epoxy resin and stainless steel special materials were adopted to allow semi-permanent measurement.
Application
- Measurement of pore water pressure at soft ground field
- Water level measurement at river, reservoir and standpipe
- Research of stability of slope and ground
- Measurement of leakage and underground water flow of
dam, embankment and lake.
Feature
- High stability that can be worked under extreme conditions.
- Excellent reproducibility and responsibility which is free from
the cable length and change of resistance - Optimization by use and supersensitive design
- High accurate temp sensor and lightning protection device mounted.
Specification
| Model | SJ – 4000 | SJ – 4050 |
|---|---|---|
| Type | General | Heavy duty |
| Capacity | 2-70kg/cm² | |
| Max. Pressure | 150 % FSR | |
| Resolution | 0.025% FSR | |
| Accuracy | +/-0.1% FSR | |
| Non-linearity | +/-0.5% FSR | |
| Operation Temp. | -20 °C ~ 50 °C | |
| Temp sensor | NTC Thermistor (3KD-ATF) | |
| Temp sensor operation range | Thermistor: -40 °C ~ 80 °C | |
| Temp sensor accuracy | Thermistor: ±1°C | |
| Filter | Stainless sintered filter 70μm | |
| Lightening Protection | Tube Gas Arrester (Frequency output line) | |
| Main material | Stainless special steel, High density epoxy potting | |
| Dimension | 130mm X Ø20mm | 190mm X Ø34.9mm |
| Weight | 0.2kg | |
| Material | Special stainless steel, High density epoxy potting | |
Installation
- If air is in piezometer, reading value can be lower than real value. So piezometer shall be inputted to water from before 24 hours of installation.
- If many cable can cause loss of pore pressure, installer shall install less than 3 piezometers in one bore hole.
- If settlement is occurred and signal cable has not extra length, cable can be cut. So when piezometer is installed, 10 – 20% extra length cable is installed.
- If isolation between piezometers is poor, reading value can be not accurate. Installer shall not use bentonite powder, use bentonite pellet.
- If top of signal cable is contacted with ground, water can be inserted into cable. Therefore, top of cable shall be covered by cable cap or others.
- The initial days of installation, pore pressure can be increased by expansion of bentonite, but over pressure is disappeared after few days.
- Signal cable shall be protected by PVC pipe or hose.
