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Model 3542RA Averaging Axial Extensometers - Epsilon Technology
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Model 3542RA Averaging Axial Extensometers - Epsilon Technology


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3542 RA Averaging Axial Extensometers
Epsilon
Technology Corp
Designed for compressive strength tests on rock, concrete and other large compression samples, the 3542RA measures axial strain on opposite sides of the test specimen, and the output is an average of the two readings. Gage lengths from 1 to 8 inches (25 to 200 mm) and measuring ranges from
.050 to .250 inches (1.2 to 6 mm) are available.
The Model 3542RA is available in a variety of configurations. All are self-supporting on the specimen and mount very easily. For tests where a single diameter specimen is typically used, the fixed diameter Model 3542RA1 is recommended. For applications where a continuously adjustable diameter extensometer is required, the Model 3542RA2 is available. If desired, the two readings can be independent, providing two outputs. Many rock tests are done in tri-axial pressure vessels. Epsilon has versions for use in oil to 1360 bar at 200 °C (20,000 psi at 400 °F). These will fit in unusually small inside diameter vessels. For small diameter specimens, we suggest the Model 3442RA1 averaging axial extensometer.
All Model 3542RA extensometers are designed so they may be used together with the Model 3544 circumferential or 3975 diametral extensometer. Epsilon's rock extensometers can withstand the punishment of daily, high volume testing. Some units have been used for several thousand tests without damage. The included conical point contacts are made from tungsten carbide.
Ordering Information
Features
• Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system.
• High accuracy, averaging output or optional dual independent outputs.
• All standard units meet existing ASTM class B-1 and ISO 9513, class 0,5 requirements for accuracy.
• Rugged, dual flexure design for strength and improved performance.
• Includes high quality foam lined case.
• Easy mounting, attaches with integral springs.
• Self-supporting on the specimen.
• May be used simultaneously with Model 3544 circumferential extensometers or Model 3975 diametral extensometer.
Model 3542RA Extensometer Standard Versions: ANY combination of gage length, measuring range and temperature range listed below is available, except as noted. Test specimen diameter(s) must be specified at the time of order.
U.S.A.
-0100
1.000"
-0200
2.000"
-0300
3.000"
-0400
4.000"
-0500
5.000"
-0600
6.000"
-0800
8.000"
METRIC
-025M
25.0 mm
-050M
50.0 mm
-080M
80.0 mm
-100M
100.0 mm
-150M
150.0 mm
-200M
200.0 mm
Measuring Range
DESIGNATION
-050T -100T -250T
±0.050" ±0.100" ±0.250"
METRIC
-120M -250M -600M
±1.2 mm ±2.5 mm ±6.0 mm
3542RA2 for 50 to 150 mm diameters, 100 mm gage length.
Specifications
Excitation: Output: Linearity
Temperature Range: Cable: Specimen Size:
5 to 10 VDC recommended, 12 VDC or VAC max. 2 to 4 mV/V nominal, depending on model <0.20% of full scale measuring range, depending on model
Standard (-ST) is -40 °C to +100 °C (-40 °F to 210 °F) Integral, ultra-flexible cable, 8 ft (2.5 m) standard Wide range of specimen sizes available, including AX, BX, NX and larger, to 8 inches (and 200 mm) diameters standard (larger sizes on special order) <30 g typical per side
Model Number 3542RA
т
т
Diameter Type1
1
Fixed
2
Adjustable
3542RA1 for 2 inch diameters (NX size).
Operating Force:
Temperature Range
-265 "C to 100 "C (-450 "F to 210 "F) -40 "C to 100 "C (-40 "F to 210 "F) -40 "C to 150 "C (-40 "F to 300 "f) -40 "C to 175 "C (-40 "F to 350 "f)2 -265 "C to 175 "C (-450 "F to 350 "F)2
-LT
-ST
-HT1
-HT2
-LHT
Options
Connectors to interface to nearly any brand test equipment
Shunt calibration module (see page 96)
Dual independent outputs
Fixed or variable diameter configurations
1 Additional diameter configurations are available with special order
2 Short term use to 200 X (400 X) acceptable
Example: 3542RA1- 100M-600M-ST: Fixed size, 100 mm gage length, 6.0 mm measuring range, standard temperature option (-40 °C to 100 °C)
3542RA with 3544
The Model 3542RA may be used simultaneously with the Model 3544 circumferential extensometers (shown) or the Model 3975 diametral extensometers.
3542RA and 3544 in test.
VARIES WITH MEASUREMENT RANGE
[152.5] 6.00
[ 50 mm ]
2 inch gage length
[55.5] 2.19
3542RA1 for 4 inch
diameters, 8 inch gage length.
3542RA2 for 1 to 3 inch diameters, 1 inch gage length.
DIMENSIONS: [mm] Inches 3542RA2 WITH 6' GAGE LENGTH, TO FIT SAMPLES FROM 2" TO 6' IN DIAMETER
3542RA1 WITH 2" OR 50 MM GAGE LENGTH
Contact Epsilon for your special testing requirements.
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