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Digital Tape Extensometer

  • tape extensometer

Typical applications include:

  • Monitoring convergence of tunnel walls.
  • Monitoring deformations in underground openings.
  • Monitoring displacement of retaining structures, bridge supports, and other structures.

Advantages of the Digital Tape Extensometer

Repeatable Measurements: The digital tape extensometer provides extremely repeatable measurements over spans up to 30 meters or 100 feet. The new digital display makes measurements easy.

Economical Reference Points: Stainless steel eyebolt reference points are economical and easy to keep clean. The eyebolts can be bolted or welded to the structure or threaded into groutable or expansion-type anchors.

Rugged: Precision parts are protected by a strong aluminum body and a plastic lens.

Easy to Use: The digital tape extensometer’s hook and eyebolt system is easy to use and offers unrestricted angular movement of the tape. Tape tension is easy to adjust, even when the operator wears gloves.

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METRIC TAPE EXTENSOMETER
Measurement Repeatability± 0.10 mm.
Steel Tape13 mm x 20 m or 13 mm x 30 m, perforated at 50 mm intervals, graduated in mm. Thermal coefficient of expansion is 11.6 ppm per degree.
Dimensions70 mm OD, 610 mm overall length.
WeightApproximately 2 kg
BatteriesSR44 silver oxide cell. Battery life is approximately 3 years.
Operation Temperature0 to 40 °C.
English Tape Extensometer
Display Resolution0.0005 inch
Measurement Repeatability± 0.005″
Steel Tape0.5″ x 60 or 0.5″ x 100′, perforated at 2-inch intervals with 1/8″graduations. Thermal coefficient of expansion is 6.45 ppm per degree F
Dimensions2.75″ OD, 24″ overall length
WeightApproximately 4.5 lb.
BatteriesSR44 silver oxide cell. Battery life is approximately 3 years
Operation Temperature0 to 40 °C
Metric Tape Extensometer Part Number
Unit with 20 m tape51811510
Unit with 30 m tape51811530
English Tape Extensometer
Unit with 66′ tape51811500
Unit with 100′ tapeSpecial Order
Reference Points
Reference Point
51812000

Stainless steel eyebolt with lock nut. Threads into groutable or expansion anchor.

Groutable Anchor51804304

Steel rebar tapped to accept reference point. #5 rebar x 4″ long (16 x 101 mm ).

Expansion Anchor51812050

Tapped for reference point. Requires 35 mm (1.375″) drill hole.

Accessories
Carrying Case51812100

Sturdy vacuumed formed ABS plastic carrying case with foam lining for shock protection.

Metric Replacement Tape, 20 m11801370
English Replacement Tape, 66′11801380

Stainless steel reference points are permanently installed at measurement stations along the tunnel or structure. To obtain a measurement, the operator stretches the tape between two reference points, hooking the free end of the tape to one point and the instrument body to the other. The operator tensions the tape by turning a knurled collar until two index marks are aligned and then notes the reading from the tape and the digital display. The sum of these readings is the distance between the two reference points. By comparing the current reading to the initial reading, the operator can calculate the change in distance between the two reference points.

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