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Circumferential Extensometer

Rock samples change in circumference as they are compressed and this change is measured by a circumferential extensometer. This is a more accurate method compared to using diametral extensometers. Circumferential extensometers measure the circumferential strain deformation that diametral extensometers can measure when local slabbing occurs.
The transducer test kit consists of a circumferential deformation measuring device, using a specially manufactured sensitive roller-chain, a high-quality LVDT displacement transducer (extensometer) and a high-pressure cable with a quick connector to adapt to high-pressure cable ports.
A sample attachment kit can be used to help the extensometers work with a variety of sample diameters. Axial extensometers can be mounted simultaneously with circumferential extensometers.
This piece of equipment is highly-accurate, durable and can measure strains on samples over a wide range of operating pressures and temperatures.
Extensometers typically connect directly to the test machine controller. Our extensometer package includes the required connector and wiring to plug it directly into the controller.


  • Easy set-up (installation and removal)
  • Ideal for compression tests on different samples e.g. asphalt, rock, concrete and other samples
  • Exceptional temperature compensation
  • Measures strains on samples over a wide range of operating pressures and temperatures
  • A calibration certificate is included on request
  • Including electrical feed-through and quick-coupling connectors
  • It measures circumferential strain deformation that diametral extensometers can measure when local slabbing of the sample occurs

Operating pressure

Up to 140 MPa (20,000 psi)

Operating temperature

Various options up to 180 °C (356 °F)

Measuring range

+/-.2.5 mm; +/-5 mm; +/-10 mm

Sample diameters

Various versions from 38 mm to 100 mm

Linearity 

0.1% F.S.

Accuracy class

0.25

Output signal

2 mV/V

Signal conditioning

0-10 V

Supply voltage 

120 VAC/60 Hz or 230 VAC / 50 Hz

*Custom sample sizes on request

  • Not available
  • Not available
  • Not available
  • Detailed information will follow soon