Strain Gauge Piezometer
The RST Instruments Strain Gauge Piezometer measures hydrostatic pressure to determine water level and records dynamic changes in pore water pressure. Its 21 mm diameter suits narrow boreholes. It comes with either an open ported nose or a piezometer nose with a sintered stainless steel filter.
- Description
- Characteristics
- Solutions
- Model information
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Sensor Design and Connection Options
The open ported nose is suitable for water level and depth measurements. For pore water pressure measurements in soil, a piezometer nose with a sintered stainless steel filter is available. The instrument is suitable for monitoring wells and seawater depth measurements.
The sensing element uses a flush diaphragm made of 316L stainless steel. The electronics apply 16-bit digital error correction and temperature compensation. A sealed cable entry protects the sensor during submersion. Multistage transient protection reduces the effects of surges induced by nearby lightning.
The analog signal can be read by an RST data logger or a compatible data acquisition system. Each serial-numbered sensor comes with a calibration sheet documenting input and output conditions, static accuracy, and thermal performance. Calibration is traceable to NIST standards. Specify the measurement range, nose type, output signal, and cable length when ordering.
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Technical specifications
- Accuracy ±0.1% of the basic range (total error band, TEB)
- Standard pressure ranges 0–1 m through 0–300 m of water head
- User-specified level range 0–3 ft through 0–900 ft of water column
- Compensated temperature range −10 to +80 °C
- Field range adjustment Available
- Pressure output 4–20 mA, 0–5 V, or 0–10 V, depending on configuration
- Supply voltage for 4–20 mA output 8–28 V DC
- 4–20 mA connection Two-wire analog
- Temperature output Optional
- Wetted materials 316L stainless steel, polyamide, and fluorocarbon
- Cable connection Vented Hytrel cable or sealed cable
- Cable options EL380004 or Kevlar®-reinforced EL380004K
- Dimensions 109 mm long, 21 mm diameter
- * Conducted transients from indirect lightning activities.
- **T.E.B.: Total Error Band: Includes the combined effects of non-linearity, hysteresis and non-repeatability as well as thermal dependencies, over the compensated temperature range, expressed as a percentage of the Basic Range. All intermediate ranges are realized by deranging from standard Basic Ranges of 30, 100, 300 and 900 ft WC.
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Applications
- Monitoring groundwater and surface water levels;
- Tracking water levels in wells, including narrow boreholes;
- Taking measurements during soil percolation tests;
- Measuring hydrostatic pressure;
- Monitoring water levels during site remediation;
- Measuring water pressure in deep aquifers;
- Measuring depth in seawater;
- Tracking water level drawdown during pumping;
- Monitoring water levels during dewatering;
- Measuring pore water pressure in dams;
- Recording water level recovery during borehole slug tests;
- Measuring dynamic changes in pore water pressure.
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Technical specifications
Model Description Range Dimensions ELSGP510S Sealed version with open ported nose, 4–20 mA output Specified at order 109 × Ø21 mm ELSGP500S Sealed version with open ported nose, 0–5 V output Specified at order 109 × Ø21 mm ELSGP511S Sealed version with filtered piezometer nose, 4–20 mA output Specified at order 109 × Ø21 mm ELSGP501S Sealed version with filtered piezometer nose, 0–5 V output Specified at order 109 × Ø21 mm
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