MODEL

3442 RA1

Miniature Averaging Axial Extensometers

Epsilon

Technology Corp

With gage lengths of 1 and 2 inches (25 and 50 mm)and measuring ranges of 0.050 and 0.100 inches (1.2 and 2.5 mm),the Model 3442RA See the electronics section of this catalog foravailable industrial signal conditioners and strain meters. 1 was designed forapplications where compressive strength tests on small rock,concrete and other small compression samples is desired. Features O

RDERING

I

NFORMATION •

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

Model 3442RA Extensometer Standard Versions: ANY combination of gagelength, measuring range and temperature range listed below is available, except as noted. Test specimen diameter(s) must be specified at the time of order. •

High accuracy, averaging output or optional dual independent outputs.

Gage Length Measuring Range •

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

U.S.A. DESIGNATION -0100 1.000” -050T ±0.050” -0200 2.000” -100T ±0.100”
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Rugged, dual flexure design for strength and improved performance.

METRIC METRIC •

Includes high quality foam lined case.

-025M 25.0 mm -125M ±1.25 mm -050M 50.0 mm -250M ±2.50 mm
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Easy mounting, attaches with integral springs.

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Self-supporting on the specimen.

Model 3442RA1 with 50 mm gage length and 1.25 mmmeasuring range. Shown on 30 mm diameter test sample. •

Designed for smaller diameter specimens.

Axial strain is measured on opposite sides of the testspecimen and the output is an average of the two readings. The Model 3442RA1 is available in a variety of configurations for samples 2 inches (50 mm) or smaller in diameter. All are self-supporting on the specimen and mount very easily. The included conical point contacts are made from tungsten carbide. If desired, the two readings can be independent, providing two outputs. Epsilon has versions for use in oil to 20,000 psi at 400 °F (1360 bar at 200 °C). These units will fit in unusually small inside diameter vessels. For large diameter specimens, we suggest one of the Model 3542RA averaging axial extensometers.The Model 3442RA1 extensometers are strain gageddevices, making them compatible with any electronics designed for strain gaged transducers. Most often they areconnected to a test machine controller. The signal condition-ing 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 connect- ed to data acquisition boards, chart industrial recorders or other equipment.

S PECIFICATIONS

Model Number 3442RA 1 -________-________-____

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Excitation: 5 to 10 VDC recommended, 12 VDC or VAC max.

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Output: 2 to 4 mV/V nominal, depending on model Linearity ≤ 0.20% of full scale measuring range, dependingon model Temperature Range Temperature Range: Standard (-ST) is -40 ° C to +100 ° C (-40°F to 210 °F) -LT -265 ËšC to 100 ËšC (-450 ËšF to 210 ËšF)
Cable: Integral, ultra-flexible cable, 8 ft (2.5 m) standard -ST -40 ËšC to 100 ËšC (-40 ËšF to 210 ËšF)
Operating Force: <30 g typical per side -HT1 -40 ËšC to 150 ËšC (-40 ËšF to 300 ËšF) -HT2 -40 ËšC to 175 ËšC (-40 ËšF to 350 ËšF)
1 1 O PTIONS -LHT -265 ËšC to 175 ËšC (-450 ËšF to 350 ËšF)
Connectors to interface to nearly any brand test equipmentShunt calibration module 1 (see page 96) Short term use to 200 Ëš C (400 Ëš F) acceptable. Dual independent outputs Example: 3442RA1-0200-050T-ST: 2.0 inch gagelength, 0.050 inch measuring range, standard temperature option (-40 °F to 210 °F) [ 50 mm ]gage length2.2757.7VARIES WITH 2 inchSPECIMEN DIAMETER1.7143.4 Contact Epsilon for your special testing requirements. 3442RA1 WITH 2” OR 50 MM GAGE LENGTH DIMENSIONS:[mm] inches 56 57