What's New Page 2

Digital Tape Extensometer

The digital tape extensometer is used to determine changes in the distance between pairs of reference points. Its new digital display makes measurements easier and more precise. More information

Vented VW Settlement Cell

The vented VW settlement cell is designed to monitor settlements in soil from a remote location. It offers a range of 14 m (47 feet) and a repeatability of ±4.3 mm (0.17 inch). Since the cell is vented, it automatically compensates for changes in barometric pressure. Its large vent tube and oversize dessicant chamber prevents problems with condensation. More information

Multi-Level VW Piezometer

The multi-level VW piezometer is used in series to monitor pore-water pressure at multiple zones in a borehole.

The system combines our standard, proven VW piezometers and off-the-shelf PVC pipe, and - in a very simple and economical way - solves or avoids most of the problems associated with in multi-level installations. More Information

Vented VW Pressure Transducer

The Vented VW pressure transducer is designed specifically for monitoring water levels in wells and stilling basins. It can sense changes of approximately 0.01 foot of water (3 mm of water). An large vent tube and an oversize desiccant chamber prevents problems with condensation. It is currently available in a pressure range of 0 to 1.5 bar ( 22 psi). More Information

Casing Anchor

When grout backfill is still a fluid, it exerts an uplift force that can force even water-filled casing out of the borehole. The obvious way to counter this buoyancy - holding the casing down from the top - has some unfortunate side-effects. Held down from the top, the casing goes into compression and snakes from side to side in the borehole. Thus casing curvature is present from the start, and slight changes or errors in the positioning of the probe will produce reading errors - the larger the curvature, the larger the error.

The best way to counter buoyancy is to anchor the casing at the bottom, either by weighting it or by using a convenient casing anchor. When the bottom is anchored, the rest of the casing self-centers in the borehole and becomes very straight. The casing anchor shown here has spring loaded arms that are activated when a pin is pulled. Casing anchors are available for 70 mm • 2.75" and 85 mm • 3.34" casing sizes.
PDF Instructions for Using the Casing Anchor

Titanium Pressure Transducer

The titanium pressure transducer is a 4-20mA device that is compatible with most industrial data loggers. Its titanium body and diaphragm allows it to survive in salt water and other corrosive environments.
More information

VW Temperature Sensor

The VW temperature sensor is designed for monitoring the heat of hydration in mass concrete structures. It has an accuracy better than ± 0.3°C over a span of 80 degrees. Resistive-type temperature sensors are also available. More information

EL Deep-Water Tiltmeter

The deep-water tiltmeter is a narrow angle, high resolution device for monitoring changes in the inclination of a structure. Rated waterproof to pressures beyond 2 MPa, the tiltmeter is suitable for applications such as monitoring the behavior of the concrete face of rockfill dams and monitoring rotation of piers, piles, and retaining walls. The tiltmeter has a range of ±3 degrees. More Information

Instrument Quads

Gord McKenna presents a practical solution for protecting your geotechnical instruments from damage: "the veritable instrument quadruped – day and night, a four-footed friend for the instrumentation specialist who wants dependability, simplicity, and an attractive corral that says, “Keep away from this sensitive instrument” with unequalled style. Under average conditions your quad” will last for a decade, and should it be damaged, it is easy to repair with hammer and nails. Download the full article.