What's New Page 3
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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
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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. |
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