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Digital Tape Extensometer

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The Digital Tape Extensometer is a portable device used for measuring displacement between pairs of eyebolts. These may be installed on a structure or in an excavation such as a tunnel or shaft. The Digital Tape Extensometer unit comprises a stainless steel measuring tape with equally spaced precision punched holes. The tape winds onto a reel, which incorporates a tape tensioning device and a digital LCD readout.

The Magnetic Extensometer System is installed at locations where monitoring of settlement or heave is needed.

For quick and accurate measurement of relative distances between pairs of reference points on the surfaces of structures including radial movements and convergence of tunnels, shafts, linings and caverns, deformation of excavations in underground caverns and displacements of retaining walls, cuttings, bridge piers, arches.

Product Features
• Measuring range of up to 30m
• Digital LCD readout giving precise measurement
• Stainless steel measuring tape
• Optical tension indicator

The instrument only requires one person to operate. The body of the extensometer has a hook connector that connects to the first eyebolt. An identical hook on the free end of the tape connects on to the opposing eye bolt.

The user then tensions the instrument and record the readings from the digital LCD display. The measurements are not absolute, but relative to the previous measurement. This provides an accurate record of displacement over time.

Product Benefits
• Compact, portable and lightweight
• Accurate and robust
• Simple, reliable and easy to read
• Repeatable measurements using the optical tape tension indicator
• Can be operated by one person
• Can read multiple arrays using a single instrument

Ordering Information:
Digital Tape Extensometer
Tapes are stainless steel for use with E3-2 eyebolts
E3-4.30 20 metre tape length
E3-4.31 30 metre tape length

Convergence Eyebolts
E3-2.31 With groutable anchor, 100mm length
E3-2.34 Protective cap for E3-2 anchors

Installation Equipment
W6-4.4 Polyester resin cartridge 150ml, To fix anchor into drill hole
W6-4.5 Cartridge injection tool
W6-4.2 Metal adhesive for securing eyebolt to metal structure
E3-3.8 Tool kit for drilling holes in metal structures. Tool kit includes; 8.5mm diameter drill, tap wrench and M10 taps.

Extensometer Accessories
E3-5.18 Portable reference bar

Extensometer Spares
E3-5.13 Replacement stainless steel tape, 20 metre length
E3-5.14 Replacement stainless steel tape, 30 metre length
E3-5.20 Spare battery R44

Manual
MAN-063 Digital tape extensometer