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Vibrating Wire Push-In Pressure Cell

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The Vibrating Wire Push-In Pressure Cell is normally installed in vertical boreholes and measures total horizontal stresses. They are often installed in stiff clay behind and in front of retaining walls, in soft puddle clay cores of old embankment dams and in glacial till adjacent to sea cliffs.

Over 30 years of expertise in the design and manufacture of Vibrating Wire instrument technology

The Vibrating Wire Push-In Pressure Cell measures total earth pressures in all soil types. The cell is spade-shaped and pointed at one end. A piezometer within the unit allows the measurement of pore water pressure and therefore the derivation of effective pressure.

Product Features
• Uses proven Vibrating Wire technology
• Designed to be pushed into all soil types
• Recoverable push-in casing
• Additional, integral pore pressure sensor allows derivation of effective pressure
• Measures total earth pressures in all soil types
• Fast response to low volume pressure changes
• Suitable for manual or remote monitoring
• Fitted with thermistor for temperature monitoring
• Strong, screened and flexible connecting cables

The cell is formed from two sheets of steel welded around the periphery, with the narrow gap between the plates being filled with oil. A Vibrating Wire pressure transducer is connected by a short steel tube, forming a sealed hydraulic system. A porous filter disc is incorporated in the cell and is connected to a second Vibrating Wire transducer, together forming an integral piezometer. The two Vibrating Wire transducers are mounted in tandem behind the spade-shaped cell and protected within the installing pipe.

Operation
A borehole is formed to a depth just short of the installation level. The Push-In Pressure Cell is lowered to the base of the borehole via the push-in casing. Once at the base, the orientation of the cell is checked before pushing it to its final elevation below the base of the borehole. The temporary push-in casings are then removed leaving the cell in situ.

After the removal of the push-in casings, the borehole is grouted. The sensor cables connect the transducers to either a terminal unit or data logger.

Ordering Information:

Push-In Vibrating Wire Pressure Cell/Piezometer Combination
Oil filled, mild steel pressure cell. Combination pressure cell requires cable for two transducers
P9-1.1 Pressure Cell 300kPa : Piezometer 300kPa
P9-1.2 Pressure Cell 500kPa : Piezometer 300kPa
P9-1.3 Pressure Cell 1000kPa : Piezometer 300kPa
P9-1.4 Pressure Cell 2000kPa : Piezometer 300kPa
P9-1.5 Pressure Cell 4000kPa : Piezometer 300kPa
P9-1.6 Pressure Cell 500kPa : Piezometer 500kPa
P9-1.7 Pressure Cell 1000kPa : Piezometer 500kPa
P9-1.8 Pressure Cell 2000kPa : Piezometer 500kPa
P9-1.9 Pressure Cell 4000kPa : Piezometer 500kPa
P9-1.10 Pressure Cell 1000kPa : Piezometer 1000kPa
P9-1.11 Pressure Cell 2000kPa : Piezometer 1000kPa
P9-1.12 Pressure Cell 4000kPa : Piezometer 1000kPa
P9-1.1-T Pressure Cell 300kPa : Piezometer 300kPa with thermistors
P9-1.2-T Pressure Cell 500kPa : Piezometer 300kPa with thermistors
P9-1.3-T Pressure Cell 1000kPa : Piezometer 300kPa with thermistors
P9-1.4-T Pressure Cell 2000kPa : Piezometer 300kPa with thermistors
P9-1.5-T Pressure Cell 4000kPa : Piezometer 300kPa with thermistors
P9-1.6-T Pressure Cell 500kPa : Piezometer 500kPa with thermistors
P9-1.7-T Pressure Cell 1000kPa : Piezometer 500kPa with thermistors
P9-1.8-T Pressure Cell 2000kPa : Piezometer 500kPa with thermistors
P9-1.9-T Pressure Cell 4000kPa : Piezometer 500kPa with thermistors
P9-1.10-T Pressure Cell 1000kPa : Piezometer 1000kPa with thermistors
P9-1.11-T Pressure Cell 2000kPa : Piezometer 1000kPa with thermistors
P9-1.12-T Pressure Cell 4000kPa : Piezometer 1000kPa with thermistors

Push-In Vibrating Wire Pressure Cell
Oil filled, mild steel pressure cell
P9-2-3 300kPa pressure range
P9-2-5 500kPa pressure range
P9-2-10 1000kPa pressure range
P9-2-20 2000kPa pressure range
P9-2-40 4000kPa pressure range
P9-2-3-T 300kPa pressure range with thermistors
P9-2-5-T 500kPa pressure range with thermistors
P9-2-10-T 1000kPa pressure range with thermistors
P9-2-20-T 2000kPa pressure range with thermistors
P9-2-40-T 4000kPa pressure range with thermistors

Installation Accessories
P9-3.1 Left hand to right hand threaded coupling
P9-3.2 Installing tube, 1 metre length. 2 inch nominal bore, includes coupling
P9-4.7 Installing tube, 2 metre length. 2 inch nominal bore, includes coupling
P9-3.3 Pushing adaptor
S10-3.3 Pushing cap
P9-4.2 Hand Punner. 150mm diameter punner, 500mm handle
P8-3.9 Push-in vibrating wire pressure cell tool kit. Includes tool box, piezometer filter priming aid, tube cutter, steel rule, 8 inch & 6 inch adjustable

Connecting Cable And Fittings
CA-2.3-2-SC 2 core, multicore cable, 16/0.020, screened. Price per metre, PVC jacket
CA-2.3-4-SC 4 core, multicore cable, 16/0.020, screened. Price per metre, PVC jacket, for instruments with thermistors
CA-4.1 Joint sealing kit
CA-4.2 Coloured adhesive tapes. Set of 10No
CA-4.3 Crimping tool
CA-4.4 Crimping sleeves. Set of 100No
W6-6.1 Nylon ties. Price each, 150mm x 3.5mm. Pack of 100No
ST1-3.5 Nylon ties. Price each, 370mm x 4.7mm. Pack of 100No

Manual
MAN-157 Push-in Vibrating wire pressure cell