Photo of Model 4500S and 4500AL.

Standard Piezometers

Model 4500S, 4500SH, 4500AL(V)

The Model 4500 Standard Piezometer is designed to measure fluid pressures such as ground water elevations and pore pressures when buried directly in embankments, fills, etc. Also for installation inside boreholes, observation wells and standard (>19 mm diameter) piezometer riser pipe. The Model 4500SH is designed with a heavy duty housing for pressures that exceed 3 MPa. The Model 4500AL is designed for low-pressure ranges. The vented version (ALV) provides automatic compensation for barometric pressure changes. Thermistors are included to measure temperatures.*

Specifications 4500S 4500SH 4500AL(V)
Standard Ranges

350, 700 kPa;

1, 2, 3 MPa

5, 7.5, 10,

20 MPa

 70, 170 kPa
Over Range 2 × rated pressure
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range¹ −20°C to +80°C
Length × Diameter 133 × 19.1 mm 194 × 25.4 mm 133 × 25.4 mm

¹High temperature versions available on request.

Photo of Model 4500B and 4500C.

Small Diameter Piezometers

Model 4500B, 4500C

These piezometers are uniquely designed to enable the automation of small diameter non-standard piezometer standpipes. The 4500B will fit inside 19 mm pipe and the 4500C will fit inside 12 mm pipe.*

Specifications 4500B 4500C
Standard Ranges 350, 700 kPa; 1, 2, 3 MPa 350, 700 kPa
Over Range 2 × rated pressure 2 × rated pressure
Resolution 0.025% F.S. (minimum) 0.05% F.S. (minimum)
Accuracy ±0.1% F.S. ±0.1% F.S.
Linearity¹ <0.5% F.S. <0.5% F.S.
Temperature Range² −20°C to +80°C −20°C to +80°C
Length × Diameter 133 × 17.5 mm 165 × 11 mm

¹±0.1% F.S. option available in some ranges for the 4500B only.

²High temperature versions available on request.

Photo of Model 4500DP.

Drive Point Piezometers

Model 4500DP

The Model 4500DP Drive Point Piezometer has the transducer located inside a housing with an EW drill rod thread and removable pointed nose cone. This model is ideally suited for use in peat and soft clays. The piezometer may be recovered at the end of the job. Models are also available which use metric threads allowing for installation using conventional cone penetrometer or other drill rods with adapters.*

Specifications
Standard Ranges 70, 170, 350, 700 kPa; 1, 2, 3, 5, 7.5 MPa
Over Range 2 × rated pressure
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range¹ −20°C to +80°C
Length × Diameter 187 × 33.3 mm

¹High temperature versions available on request.

Photo of Model 4500HD.

Heavy Duty Piezometer

Model 4500HD

The Model 4500HD Heavy Duty Piezometer is designed for direct burial in fills and dam embankments. The 4500HD is used in conjunction with heavily armored cable to withstand earth movements during construction. Recommended for use in earth dams.*

Specifications
Standard Ranges 70, 170, 350, 700 kPa; 1, 2, 3, 5, 7.5 MPa
Over Range 2 × rated pressure
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range¹ −20°C to +80°C
Length × Diameter 203 × 38.1 mm

¹High temperature versions available on request.

Photo of Model 4500HT.

High Temperature Piezometer

Model 4500HT

The Model 4500HT High Temperature Piezometer is designed for applications where the temperature may be as high as 230°C. Two versions are available, one for continuous use up to 200°C and one for up to 230°C. These sensors are supplied with either mineral insulated cables or Teflon cables inside stainless steel tubing.*

Specifications
Standard Ranges 700 kPa; 1, 2, 3, 5, 7.5, 10, 20, 35, 75, 100, 150 MPa
Over Range 2 × rated pressure
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range 0°C to +230°C
Length × Diameter 133 × 19.1 mm

Photo of Model 4500MLP.

Multilevel Piezometer

Model 4500MLP

The Model 4500MLP system overcomes the problems associated with the installation of multiple piezometers in a single drill hole. The 4500MLP is lowered into position and a spring loaded apparatus is actuated forcing specially configured piezometer filter elements into firm contact with the borehole walls. The borehole is then grouted from the bottom in one quick and simple operation.*

Specifications
Standard Ranges 70, 170, 350, 700 kPa; 1, 2, 3, 5, 7.5 MPa
Over Range 2 × rated pressure
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range −20°C to +80°C
Borehole Diameter 100 to 150 mm

Photo of Model 4500Ti.

Titanium Piezometer

Model 4500Ti

The Model 4500Ti is designed specifically for use in highly corrosive environments such as landfills and leach fields. Also used in critical areas where long-term survivability is essential, for example, as in nuclear waste repositories and aggressive mine tailings. All exposed surfaces are made from titanium.*

Specifications
Standard Ranges¹ 350, 700 kPa; 1, 2, 3, 5, 7.5 MPa
Over Range 2 × rated pressure
Resolution 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range² −20°C to +80°C
Length × Diameter 125 × 25.4 mm

¹Other ranges available on request.

²High temperature versions available on request.

Photo of Model 4500AR.

Autoresonant Piezometer

Model 4500AR

The Model 4500AR “Autoresonant” Piezometer is designed for use with existing data acquisition systems incapable of reading standard (pluck and read) vibrating wire sensors. It can also be used where low frequency (<20 Hz) dynamic measurements are required. Power comes from a 6-24 VDC supply, which yields a 5 V square wave output at the sensor frequency. This high-output offers excellent noise immunity and enhanced signal transmission over long (300 m+) cables. The Model 4500AR is available in standard pressure ranges, with corresponding resolution, linearity and accuracy.

Specifications
Standard Ranges

7, 17, 35, 70, 170, 350, 700 kPa;

1, 2, 3, 5, 7.5, 10, 20, 25, 35, 50, 75, 100, 150 MPa
Over Range 2 × rated pressure
Resolution¹ 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity <0.5% F.S. (±0.1% F.S. optional)
Temperature Range² −20°C to +80°C
Length × Diameter varies according to pressure range

¹Depends on readout system.

²Other ranges available on request.

*Please Note: All Geokon vibrating wire piezometers include tripolar plasma surge arrestors to protect the sensor coils from possible lightning damage. Semiconductor piezometers are also available (see 3400 Series).

Products

Please Note: Geokon maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice.