Borehole Extensometer

Borehole 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.

  • Request Quote:

  • Complete assembly including expanding rockbolt anchors, steel rod, mechanical readout. Up to 10 ft. (3 m) long, for boreholes 1 3⁄8 in to 1 5⁄8 in ∅ (35-40 mm). Specify length.

    • $

    Complete assembly including expanding rockbolt anchors, steel rod, mechanical readout. Up to 10 ft. (3 m) long, for boreholes >1 5⁄8 in ∅ (>40 mm). Specify length.

    • $

    Complete assembly including expanding rockbolt anchors, steel rod, with provision for VW Transducer (specify range). Up to 10 ft. (3m) long, for boreholes 1 3⁄8 in to 1 5⁄8 in ∅(35-40mm). Specify length.

    • $

    Complete assembly including expanding rockbolt anchors, steel rod, with provision for VW Transducer (specify range). Up to 10 ft. (3m) long, for boreholes >1 5⁄8 in ∅ (>40mm). Specify length.

    • $
    • $

    Instrumentation Cable - 2 shielded twisted pair (22 awg) with drain wire, 0.250" diameter, blue PVC jacket.

    • $
Specifications
Options & Accessories

Options are also available with electrical transducers for remote readout and/or continuous monitoring (please contact us for details).

specifications

Standard Range up to 100 mm
Least Reading 0.025 mm
Borehole Diameter 35, 44, 51, 64 mm
Maximum Length 10 m