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MODEL

Model 3544 Circumferential Extensometers - 33099 3544

Circumferential Extensometers

Epsilon

Technology Corp

Designed for concrete and rock compression testing or for compression tests on other large samples.The Model 3544 may be used simultaneously with the Model 3542RA axial extensometers. Features O

RDERING

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NFORMATION •

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

Model 3544 Available Versions: Any combination of diameter range, measuringrange and temperature range is available, except as noted. Diameter Range •

Adapts to a wide range of specimen sizes by adding or removing chain links.

U.S.A. Circumferential Measuring Range -0400 2.00” to 4.00”
DESIGNATIONLINEARITY •

Rugged, dual flexure design for strength and improved performance.

-0600 2.00” to 6.00” -080T +0.080”0.25% -0800 2.00” to 8.00” -125T +0.125”0.25%
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Includes high quality foam lined case.

-250T +0.250”0.25%
METRIC -500T +0.500”0.30%
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Self-supporting on the specimen.

-100M 50 mm to 100 mm -150M 50 mm to 150 mm
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May be used simultaneously with Model 3542RA axial extensometers.

-020M +2.0 mm0.25% -200M 50 mm to 200 mm -030M +3.0 mm0.25%
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Versions available for use in tri-axial confining pressure cells, at high pressures and temperatures.

-060M +6.0 mm0.25%
Model 3544 -120M +12.0 mm0.30%

Circumferential extensometers measure the change in cir-cumference as the sample is compressed. This is considered by many researchers to be a more accurate way to determine diametral strain, since the measurement is taken over the entire material inside the circumference.A high precision custom roller chain with special rollersmounts the extensometer to the specimen. As the specimen diameter enlarges during the test, the chain causes the exten- someter to expand. The unit is self-supported on the sample with integral springs. Links are easily added or removed to adjust for different size specimens. A mechanical adjustment allows the output to be set to zero. A breakaway device protects the extensometer in the event of specimen rupture.Often rock specimens are tested in tri-axial pressure cells.Versions of the Model 3544 are available to fit inside the vessel and operate in oil environments at up to 1360 bar at 200 °C (20,000 psi at 400 °F). These units were designed to fit inside small inner diameter vessels.The Model 3544 is the best choice for large diametralstrains in large compression samples.Epsilon’s diametral rock and concrete extensometer, the Model 3975, is recom- mended for small strain measurements.

S PECIFICATIONS Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max. Output: 2 to 4 mV/V nominal, depending on model

Model Number 3544-________-______-____

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Linearity 0.25% to 0.30% of full scale measuring range,depending on model

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Temperature Range: Standard (-ST) is -40 ° C to +100 ° C (-40 °F to 210 °F) Temperature Range Cable: Integral, ultra-flexible cable, 8 ft (2.5 m) standard -LT -265 ËšC to 100 ËšC (-450 ËšF to 210 ËšF)
O PTIONS -ST -40 ËšC to 100 ËšC (-40 ËšF to 210 ËšF) -HT1 -40 ËšC to 150 ËšC (-40 ËšF to 300 ËšF)
3544 with optional horizontal configuration. 1 Connectors to interface to nearly any brand of test equipmentShunt calibration module -HT2 -40 ËšC to 175 ËšC (-40 ËšF to 350 ËšF)
1 (see page 96) -LHT -265 ËšC to 175 ËšC (-450 ËšF to 350 ËšF)
Horizontal, vertical or user convertible orientations 1 Short term use to 200 Ëš C (400 Ëš F) acceptable. Example: 3544-200M-120M-ST: 50 mm to 200 mmdiameter range, +12 mm measuring range, standard temperature option (-40 °C to 100 °C) 3542RA and 3544 in test. VARIES WITHCONFIGURATION2.0652.3 Contact Epsilon for your special testing requirements. TYPICAL 3544 DIMENSIONS:[mm] inches 60 61