3448 High Temperature Self-Supporting Furnace Extensometers (1200 °C) Designed for use with furnaces and induction heating systems, these extensometers use Epsilon’s exclusive, self-supporting design. A wide range of options cover most testing applications. Self-supporting Model 3448 with clamshell-type materials testing furnace The Model 3448 may be used with induction heating Model 3448 with 25 mm gauge length and 20% measuring range See the Model 3448 extensometer setup video Epsilon developed this unique high temperature extensometer for testing metals, ceramics, and compostes at the high temperatures produced by i furnaces and induction heating systems. A combination The Model 3448 is self-supporting using of features make these extensometers easier to use reusable ceramic cords and better in performance than other similar high temperature extensometers. The units are held on the specimen by light, flexible ceramic fiber cords. These make the extensometer self-supporting on the specimen. No furnace mounting brackets are required. The side load on the test sample is greatly reduced because of the self-supporting design and light weight of the sensor. Most materials testing furnaces with a side cut-out for an extensometer will readily accept a Model 3448. For induction heating systems, a different ceramic cord placement allows the extensometer to easily pass between the coils. The combination of radiant heat shields and convection cooling fins allow this model to be used at specimen temperatures up to 1200 °C (2200 °F) without any cooling. An optional tiny air fan does enhance stability at the highest temper tures and is recommended for the highest accuracy and for tests with a small elongations. The fan comes with a magnetic base for support so it can be mounted at any convenient location near the extensometer. Fan cooling is not generally needed for induction heated systems. High purity alumina ceramic rods are used. These are available in lengths as required to fit your furnace. A spare set is included with every extensometer. Specify chisel, vee chisel or conical contact points as desired. Most units operate equally well in tension and compression. Tensile, compression and cyclic fatigue tests can all be performed with a single unit. For testing in strain control or to get the highest performance during cyclic fatigue tests, models 3549 or 7650A are recommended. For vacuum furnaces, special models are available. Epsilon can also provide a radiant heat transfer cooled version. This requires that the extensometer module be surrounded by a water cooled enclosure with a front slot for the ceramic rods. See the electronics section of this catalog for available signal conditioners and strain meters. Visit our website at www.epsilontech

Ordering Information May be left on through specimen failure. bridge, 350 ohm strain gaged design for compatibility with nearly any test system. Mechanical overtravel stops in both directions. All units come with high purity alumina ceramic rods. M ounts with flexible ceramic fiber cords. Very simple to install, this Epsilon exclusive design eliminates the need for external support brackets. Low contact force does not vary during testing like some externally supported extensometers. without cooling to 1200 °C (2200 °F). Optional small fan improves stability at highest temperatures. V ersions...