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High Temperature Hot Mountable Furnace Extensometers (1200°C or 1600°C) – Model 3549

Epsilon Model 3549 Extensometer

Suitable for tensile and fatigue testing when using split type materials testing furnaces or induction heaters. This model can be mounted on a hot test sample in a few seconds. With low sensitivity to vibrations, this innovative high-temperature extensometer is ideal for the demanding requirements of strain-controlled, elevated temperature uniaxial tension and fatigue testing.

The Model 3549 is a major advancement in the design of externally mounted furnace extensometers. It is designed to meet the stringent requirements of strain-controlled testing as prescribed in ISO 6892, ISO 12106 and ASTM E606, while introducing many innovative features that improve productivity and performance for static tensile testing, long-term testing such as low cycle fatigue and creep, and other applications requiring small strain measurements.

The overall design reduces influence from common lab environment vibrations, thermal noise, and thermal drift. It also allows the user to precisely set the contact force against the test specimen. This allows for even and repeatable contact force, limiting contact force induced errors.

The gauge length for the 3549 is automatically set prior to mounting on the test specimen, which allows for hot mounting after thermal equilibrium has been reached. These extensometers can be used in carousel systems for rapid high temperature testing.

This extensometer mounts on a slide bracket (included) that attaches to a load frame mounting bracket or directly to a furnace that has a suitable cutout. Epsilon can supply mounting brackets for nearly any load frame.

The Model 3549 is made for use with split type materials testing furnaces and induction heaters, and it uses liquid cooling in most applications. The -ST version is rated to 1200 °C (2200 °F) and is supplied with high purity alumina rods. The high temperature -HT option allows use to 1600 °C (2900 °F) and is supplied with alpha grade silicon carbide rods. Rods are made to order to the length required for your furnace.

Model 3549 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller with electronics for a strain channel, and Epsilon will equip the extensometer with a compatible connector that is wired to plug directly into the controller. For systems lacking the required electronics, Epsilon can provide a variety of signal conditioning solutions that enable connecting to data acquisition systems or other equipment.

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