Piezometers
 

Photo of 4500S and 4500AL(V)

 

Model 4500S, 4500AL(V) Standard Piezometers
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 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  
Standard Ranges

(S)
(AL(V))

350, 700 kPa; 1.0, 2.0, 3.0, 5.0, 7.5 MPa
70, 170 kPa
Over Range 2 x rated pressure
Sensitivity 0.025% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity¹ < 0.5% F.S. (±0.1% F.S. optional)
Temperature Range² –20°C to +80°C
Length x Diameter

(S)
(AL(V))

133 x 19.1 mm
133 x 25.4 mm

¹±0.1% F.S. option available in some ranges.
²High temperature versions available on request.


Photo of 4500B and 4500C  

Model 4500B, 4500C Small Diameter Piezometers
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  
Standard Ranges

(B)
(C)

350, 700 kPa; 1.0, 2.0, 3.0, 5 0, 7.5 MPa
350, 700 kPa
Over Range 2 x rated pressure
Sensitivity (B)
(C)
0.025% F.S. (minimum)
0.05% F.S. (minimum)
Accuracy ±0.1% F.S.
Linearity¹ < 0.5% F.S.
Temperature Range² –20°C to +80°C
Length x Diameter (B)
(C)
133 x 17.5 mm
165 x 11 mm

¹±0.1% F.S. option available in some ranges for the 4500B only.
²High temperature versions available on request.


Photo of 4500DP's  

Model 4500DP Drive Point Piezometers
The Model 4500DP Drive Point Piezometer has the transducer located inside a housing with an EW drill rod thread and removable pointed nose cone. When threaded onto the end of EW drill rods, the unit can be pushed directly into soft ground with the signal cable located inside the drill rod. This model is ideally suited for use in soft clays and landfills. The piezometer may be recovered at the end of the job. Models are available that are similar in construction to the 4500DP but which use metric threads allowing for installation using conventional cone penetrometer or other drill rods with adapters.*

Specifications  
Standard Ranges 70, 350, 700 kPa; 1.0, 2.0, 3.0, 5 0, 7.5 MPa
Over Range 2 x rated pressure
Sensitivity 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 x Diameter 187 x 33.3 mm

¹High temperature versions available on request.


Photo of 4500HD  

Model 4500HD Heavy Duty Piezometer
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, 350, 700 kPa; 1.0, 2.0, 3.0, 5 0, 7.5 MPa
Over Range 2 x rated pressure
Sensitivity 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 x Diameter 203 x 38.1 mm

¹High temperature versions available on request.


Photo of 4500HT  

Model 4500HT High Temperature Piezometer
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. Teflon cables inside stainless steel tubing are normally supplied with these sensors.*

Specifications  
Standard Ranges 350, 700 kPa; 1.0, 2.0, 3.0, 5.0, 7.5, 10, 25, 50, 75, 100 MPa
Over Range 2 x rated pressure
Sensitivity 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 +200°C
Length x Diameter 133 x 19.1 mm

Photo of 4500MLP  

Model 4500MLP Multilevel Piezometer
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. The design obviates the need for sand lenses around the piezometer tips. Versions with sampling capabilities are also available.*

Specifications  
Standard Ranges 70, 180, 350, 700 kPa; 1.7, 3.5, 7.0 MPa
Over Range 2 x rated pressure
Sensitivity 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 76 to 152 mm

Photo of 4500Ti  

Model 4500Ti Titanium Piezometer
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; 1.0, 2.0, 3.0, 5.0, 7.0 MPa
Over Range 2 x rated pressure
Sensitivity 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 x Diameter 125 × 25.4 mm

¹Other ranges available on request.
²High temperature versions available on request.