High Temperature Self-Supporting Furnace Extensometers (1200 °C) – Model 3448
Designed as a low-cost option for tensile testing with furnaces, these extensometers use Epsilon’s self-supporting design and do not require cooling or mounting brackets.
WITH OVER 30 YEARS OF SERVICE
to the materials testing community, you know we will be there to stand behind our products when your critical application requires it.
Epsilon developed this low-cost high temperature extensometer for tensile testing of metals, composites, and ceramics in furnaces at temperatures up to 1200 °C. The units are held on the specimen by light, flexible ceramic fiber cords. These make the extensometer self-supporting on the specimen; extensometer mounting brackets are not required. The side load on the test sample is minimized because of the self-supporting design and light weight of the sensor.
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. High purity alumina ceramic rods are used. These are available in any length that is required to fit your furnace. A spare set is included with every extensometer. Specify chisel, vee chisel or conical contact points as desired.
Static tension or compression tests that are not in strain control can be performed with a single unit. For labs performing numerous high-temperature tensile tests in a row, as well as labs performing high-temperature tensile tests or cyclic fatigue tests in strain control, models 3549 or 7650A are recommended instead of model 3448.
Most materials testing furnaces with a port for an extensometer will readily accept a Model 3448. For induction heating systems, model 3448 may be used if the induction coils do not interfere with the 3448’s arms and cords. Epsilon generally recommends models 3549 or 7650A for induction heating applications due to their higher performance and simplified compatibility with induction coils. For vacuum furnace applications, use model 3549.
Model 3448 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.
- May be left on through specimen failure.
- Full 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.
- Mounts with flexible ceramic fiber cords. Very simple to install, this design eliminates the need for external support brackets. Cords that have worn out are easily replaced by cutting a length of new cord from the included spare supply.
- Use without cooling to 1200 °C (2200 °F).
- May be used on nearly any furnace with side entry cut-out for extensometers.
- Includes the Epsilon Shunt Calibration System for on-site electrical calibration.
- Rugged, dual flexure design for strength and improved performance.
- Includes high quality foam lined case, a spare set of ceramic rods, and 7.3m of spare ceramic fiber cord.
Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.
Output: 2 to 4 mV/V, nominal, depending on model
Accuracy: Standard configurations meet ASTM E83 class B-1 and ISO 9513 class 0,5 requirements for accuracy. A test certificate is included. Rod lengths >250 mm (10″) can affect the final class rating.
Linearity: ≤0.15% of full scale measuring range, depending on model
Temperature Range: Ambient to 1200 °C (2200 °F)
Cable: Integral, ultra-flexible cable, 2.5 m (8 ft) standard
Contact Force: Adjustable, approximately 200 g depending on configuration
Operating Force: 10 to 20 g typical
- Gauge length adapter kits
- Spare ceramic fiber cord (sold in 7.3m lengths)
- Connectors to interface to nearly any brand of test equipment
- Rod tips can be straight chisels, conical tips or vee chisels; specify when ordering
Product Videos
Ordering Information
Click table options to configure
| mm or inches | # |
|---|---|
| 10.0 mm | -010M |
| 25.0 mm | -025M |
| 50.0 mm | -050M |
| 0.500 in | -0050 |
| 1.000 in | -0100 |
| 2.000 in | -0200 |
| % strain | # |
|---|---|
| ±5% | -005¹ |
| ±10% | -010 |
| +20%/-10% | -020 |
| +50%/-10% | -050 |
| +100%/-10% | -100² |
²Not available in 50 mm or 2.0 inch gauge lengths.
Related Models
Repairs/Service
If your unit is in need of service, calibration or repair, initiate the RMA process with us and we will be happy to assist.
Get Our Newsletter
Sign up for our newsletter to get the most up-to-date information on products and services.
Download Catalog
Our 2022 Extensometer Catalog, Version 110 is now available! Not finding something you’re looking for? Ask us about a custom quote.