Corrosion-Resistant Vibrating Wire Piezometer
RST Instruments VW2190 and VW2191 corrosion-resistant vibrating wire piezometers measure pore water pressure in corrosive environments. The VW2190 is designed for saline conditions, while the VW2191 is designed for acidic conditions, including those found at copper heap leach sites.
- Description
- Characteristics
- Solutions
- Model information
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Construction and Operating Principle
The piezometer determines pressure from changes in the vibration frequency of a tensioned wire. The frequency-based signal is resistant to electrical interference, and a built-in thermistor measures temperature at the installation point.
The sensor housing is made of 316 stainless steel. A glycol-filled diaphragm assembly isolates the sensing element from the corrosive medium, and a PVC outer housing protects the diaphragm. Corrosion-resistant tape and a heat-shrink sleeve provide additional protection for exposed metal surfaces.
The VW2191 uses the EL342202 signal cable with a high-density polyethylene (HDPE) jacket. The cable has two pairs of 22 AWG conductors and an outside diameter of 6.35 mm (0.25 in). Both models are compatible with DT Series data loggers and the RSTAR Affinity system.
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Technical specifications
- Pressure ranges 0,07 / 0,175 / 0,35 / 0,7 / 1,0 / 2,0 / 3,0 / 5,0 / 7,5 MPa
- Overrange 1.5 × full scale
- Pressure resolution 0.025% of full scale (min.)
- Pressure accuracy 0.1% of full scale
- Operating temperatur −20 to +80 °C
- Thermal zero shift Less than 0.05% of full scale per °C
- Housing and protective materials 316 stainless steel, PVC housing, corrosion-resistant tape, and a heat-shrink sleeve
- Thermistor type 3 kΩ NTC at 25 °C
- Thermistor interchangeability ±0.2 °C
- Thermistor resolution 0.1 °C
- Dimensions Ø 45 × 400 mm
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Applications
- Pore water pressure monitoring at copper heap leach sites;
- Pressure measurement in monitoring wells containing leach solutions;
- Pressure monitoring in heap leach process equipment;
- Pore water pressure monitoring in soils with acidic groundwater.
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Technical specifications
Model Description Range Dimensions VW2190 For saline environments. Use with EL380004, EL380004K, or EL380004HDL signal cables. See series pressure ranges under Specifications Ø 45 × 400 mm VW2191 For acidic environments. Use with the EL342202 signal cable with an HDPE jacket. See series pressure ranges under Specifications Ø 45 × 400 mm
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