For Shear Vane Calibration: see below.
Controls Pocket Vane Tester T 174
Description and Features
The T 174 pocket vane tester has been designed to measure
the undrained shear strength (Cu) of cohesive soils.
The design is very similar to the well known 'Geonor' shear vane. It consists
of a cylindrical body containing a torsional spring and three interchangeable
vanes of different sizes.
The appropriate vane is chosen for the expected strength
of the soil to be tested.
The T 174 vane can be used both in situ and in the laboratory for soils having
Cu = 24 t/sqm (240 kpa). The T 174 is particularly suitable in soft to medium
cohesive soils where other tests do not provide adequate accuracy.
Technical Characteristics
Vane T 174 is suitable for use in severe environmental
conditions. The wire of the torsional spring, for example, is made of stainless
steel as are the other parts of the instrument.
To test an undisturbed zone the vane is forced 5 - 6 centimetres into the
soil.
Deep measures can be performed using extension rods.
The choice of three different sizes of vanes allows a good accuracy of undrained
shear strengths to be obtained for a relatively wide range (0 - 240 kpa).
SPECIFICATIONS
The sensing part of the T 174 is a torsional spring; 360 rotational degrees
are produced by approximately 0.5 kgm of torque.
When the upper part of the instrument is turned by its handle an angular displacement
is created between the two cylindrical parts (upper and lower parts). The
value of this displacement is proportional to the applied torque.
Undrained shear strength (Cu) values are read from a scale etched on the vernier.
The height/diameter ratio is 2 for all the vanes. The vane sizes are designed so that:
- for the medium size vane (20 x 40mm) the Cu values are read directly from the scale (0 - 120 kpa);
- for the larger vane (25.4 x 50.8mm) readings on the vernier are to be divided by 2 to get the Cu values (0 - 60 kpa);
- for the smaller vane (16 x 32mm) readings on the vernier are to be multiplied by 2 to get the Cu values 0 - 240 kpa).
PRICES
Hand Vane Tester Kit:
(with the three vanes, measuring up to 240 kpa): $1,550
Extra Extension Rods, 1m: each $58.40
Adaptors for extra extension rods: $34.20 and $27.50 (upper and lower)
Click here to email us for enquiries, ordering and calibration of shear vane test equipment.
Calibration for Shear Vane Testers
Groundtest is an IANZ accredited calibration laboratory for shear vane instruments.
We can calibrate and certify all brands, such as Pilcon, Geonor etc.
Groundtest Equipment has been assessed by International Accreditation New Zealand and has been found to comply with the requirements of ISO/IEC GUIDE 24:1990 and ISO 9002:1994. Groundtest Equipment is registered under the Testing Laboratory Registration Act 1972 as a NEW ZEALAND ACCREDITED CALIBRATION LABORATORY.
Registration Number: 658
Date of Registration: 2 Sept 1997
For shear vane testers:
FORCE MEASURING DEVICES: Soil shear vanes and other torque transducers by in-house methods.
RANGE: 0Nm to 5.5Nm. Plus or Minus 0.1% of full scale.
See also...
Augers
Scala Penetrometer
Clegg soil impact testers
Pocket Soil Tester
Main Contents Page
Contact Details
For a comprehensive range of environmental equipment visit The Environmental Collective at envco.org.
Click to visit The Environmental Collective.
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