Vibrating Wire Extensometers
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Model A-1 Single Point Mechanical Extensometer
The Model A-1 Single Position Rod Extensometer is a very simple, rugged and reliable instrument, easily installed and completely recessed within the borehole for optimum protection. The Model A-1 is a natural first choice for monitoring the safety in and around tunnels and mine openings.
Specifications:
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Standard Range |
up to 100 mm
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Least Reading |
0.025 mm |
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Borehole Diameter |
35, 44, 51, 64 mm |
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Maximum Length |
10 m |
Model A-3 Multiple Point Groutable Anchor Extensometer
The Model A-3 Multiple Point Rod Extensometer is the preferred design for installation in downward directed boreholes which are easily filled with cement grout. Up to eight anchors can be installed, at various depths, in a 76 mm diameter borehole providing the capability to locate multiple failure plains and zones of movement.
Specifications:
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Standard Range |
up to 300 mm nominal
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Least Reading |
0.025 mm |
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Borehole Diameter |
76 mm or over |
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Maximum Length |
100 m |
Model A-4 Multiple Point Snap-Ring Anchor Extensometer
The Model A-4 Multiple Point Rod Extensometer with Snap-Ring Anchors is quickly and easily installed in boreholes in hard or competent rock. Anchors are pushed to the required depth on the end of setting rods and then a cord is pulled to remove the locking pin which allows two retaining rings on each anchor to snap outward and grip the borehole. Up to eight anchors can be installed, at various depths, in a 76 mm diameter borehole. Particularly useful in upward directed boreholes.
Specifications:
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Standard Range |
up to 300 mm nominal
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Least Reading |
0.025 mm |
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Borehole Diameter |
38 to 76 mm |
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Maximum Length |
50 m |
Model A-5 Multiple Point Hydraulic Anchor Extensometer
The Model A-5 Multiple Point Rod Extensometer with Hydraulic Anchors is recommended for use in soft ground and soils or in rock where the borehole may deteriorate. This anchor is very versatile and can be used in boreholes of varying diameter and roughness oriented in any direction.
Specifications:
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Standard Range |
up to 300 mm nominal
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Least Reading |
0.025 mm |
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Borehole Diameter |
38 to 102 mm |
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Maximum Length |
100 m |
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