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Extensometers

Model 1200 (A-4) Multiple Point, Rod, Snap-Ring | Discontinued

Model A-4 Multiple Point Rod Extensometer, shown as used in overhead or inclined upwards installations in rock (this product has been discontinued).
  • Model A-4 Multiple Point Rod Extensometer, shown as used in overhead or inclined upwards installations in rock (this product has been discontinued).
  • Model A-4 Multiple Point Rod Extensometer, shown as used in vertically downwards or inclined downwards installations in rock (this product has been discontinued).
  • Model A-4 Multiple Point Rod Extensometer, shown as used in concrete pile (in-place) installations (this product has been discontinued).
  • Snap-Ring Anchor, for use with the Model A-4 Multiple Point Rod Extensometer.
SKU:
Model 1200 (A-4)

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.

The Model A-6 has been replaced by the Model 1100 Rod Type Borehole Extensometer.

Specifications

Standard Range
up to 300 mm nominal
Least Reading
0.025 mm
Borehole Diameter¹
38 mm to 76 mm
Maximum Length
50 m

¹Any borehole diameter up to 76 mm may be specified. Note that the size of the borehole required increases with the addition of more measuring points.

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.

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