DEFLECTOMETER ACCESSORIES

A number of items are available to complement the range of deflectometers. These include a magnetic base and displacement fixtures for compression anvils.

Principle of Operation

The magnetic base provides a solid mounting for the deflectometer and allows the deflectometer to be positioned against components and structures. Deflectometers may also be used in conjunction with compression anvils using the displacement fixture.

Application Range

• To measure deflections in components, structures or between compression anvils

• For use with 2601 Series deflectometers

Safety Advice

Review safety note on page 234

ITEMS FOR USE WITH 2601-04X, 2601-06X, 2601-09X

Catalog Number Description Notes

2601-069 Magnetic base LVDT holder Cannot be used on non-magnetic surfaces 2601-071 LVDT platen displacement fixture Mounts directly on the side of the platen and target is mounted on the side of the opposing platen 2601-072 Precision micrometer, 0 to 50 mm (2 in) Allows manual calibration of 50 mm or smaller LVDTs in 0.01 mm gradations

HIGH-TEMPERATURE EXTENSOMETERS (+600°C Capacitive)

The Instron® range of high-temperature extensometers are ideally suited for testing materials such as advanced composites, metals, and polymers at elevated temperatures. This series incorporates a capacitive sensor that does not require any cooling. The extensometers are supplied with a special sensor conditioner unit providing a 0-10 V output with exceptionally low noise.

These extensometers can be attached to round and flat specimens to perform tensile, compression, and cyclic tests.

Principle of Operation

The specimen displacement is measured using a capacitive sensor rather than strain gauges, providing the extensometer with the ability to withstand high temperatures without any active cooling. The dual-flexure design makes these units very durable and allows them to be left on the specimen through failure. The extensometers are easy to mount and feature integral springs that hold the unit on the test specimen.

The freestanding sensor conditioner produces a 0-10 V output that is connected to the strain channel of the testing system. The conditioner provides an electrical calibration signal so that the strain channel on the testing machine can be set up without the need for a mechanical calibrator.

Application Range

• Static and cyclic tests up to 100 Hz

• Suitable for tensile, compression, and cyclic tests on composites, high-temperature polymers, and metals

HIGH-TEMPERATURE EXTENSOMETERS (>950 °C)

2632-055

There are many different types of high-temperature extensometers available. The type of instrument is dependent on the type of testing and the type of heating system.

The 3448, 3548 and 2632 Series of instruments are strain gauge instruments designed for high-temperature tensile, compression and fatigue testing using a side-entry port furnace.

Principle of Operation

The side-entry models employ heat shields, cooling fins, and optional air or water cooling to protect the strain gauges from excessive temperatures. The ceramic rods pass through the furnace wall. Side- entry types require a compatible furnace system that typically features a cutout and mounting surfaces for the cooling blocks.