Text version of the page

MODEL

Model 3975 Extensometer for Diametral Rock and Concrete Testing - 33099 3975

Diametral Rock and Concrete Extensometers Epsilon

Technology Corp

This extensometer was designed for accurate measure-ment of small diametral strains such as those required to determine Poisson’s ratio of rock,concrete and asphalt samples.The units are designed to be used in conjunction with the Model 3542RA axial averaging extensometer. See the electronics section of this catalog foravailable signal conditioners and strain meters. Features O

RDERING

I

NFORMATION •

Full bridge, 350 ohm strain gaged design for compatibility with nearly anytest system.

Model 3975 Available Versions: Consult factory for additional ranges. Measuring Range •

All standard units meet existing ASTM class B-1 and ISO 9513, class 0,5 requirements for accuracy.

DESIGNATION

-0003 +0.030” (0.76 mm)

•

Includes high quality foam lined case. -0006 +0.060” (1.50 mm) -0008 +0.080” (2.00 mm)

•

Rugged, dual flexure design for improved performance.

•

Easy mounting, attaches with integral springs.

•

Self-supporting on the specimen. Model Number 3975-________

•

S PECIFICATIONS Example: 3975-0008: +0.080 inches (2.00 mm)measuring range Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.
Model 3975 diametral extensometer Output: 2 to 4 mV/V nominal, depending on model

Self-supporting on the test sample, these extensometers will work on standard sized diameter samples, but special configurations are available upon request. They are designed for use in testing for Poisson’s ratio and for applications where accurate diametral measurements with low strains are required.The Model 3975 is the best choice for small diametralstrains in large compression samples.Epsilon’s circumfer- ential extensometer, the Model 3544, is recommended for large strain measurements. These units are easily attached to the sample, and rounded contact edges maintain the position on the specimen.The Model 3975 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. The signal conditioning electronics for the extensometer is typically included with the test machine controller or may often be added. In this case the extensometer is shipped with the proper connector and wiring to plug directly into the electronics. For systems lacking the required electronics, Epsilon can provide a variety of solutions, allowing the extensometer output to be connected to data acquisition boards, chart recorders or other equipment.

Linearity: ≤ 0.20% of full scale measuring range, dependingon model Temperature Range: Standard is -40 °C to +100 °C (-40 °F to +210 °F) Cable: Integral, ultra-flexible cable, 8 ft (2.5 m) standard
O PTIONS Connectors to interface to nearly any brand test equipmentShunt calibration module (see page 96)
202.97.998.93226.7 1.9148.4 Contact Epsilon for your special testing requirements. TYPICAL MODEL 3975 DIMENSIONS:[mm] inches

68 69