makroXtens Extensometer

makroXtens II is a versatile, high-accuracy extensometer Ideally suited for tensile tests, compression tests, flexure tests, and cyclic tests on metals, plastics, composites, hard foams, and metals that display low to moderate specimen strain. Also suitable for use in temperature chambers.
makroXtens extensometer

Key Advantages and Features

Advantages and features

  • With an installed base of over 6500 systems, makroXtens II is the standard extensometer in the metals, plastics and automotive industries.
  • Robust measuring system, also suitable for use in automated testing systems.
  • Can be used up to specimen break, even with high loads and brittle specimen material.
  • Optimum system protection provided by integrated safety mechanism and tilting knife-edges.
  • Accuracy Class 0.5 to EN ISO 9513
  • Maximum error ±1 μm in the differential displacement measurement between two measurement points in the range of 20 μm to 200 μm, fully satisfying the additional requirement stipulated by ISO 527-1 (2011)
  • makroXtens II is calibrated from a measurement travel of 20 µm in class 0.5
  • Extremely low sensor-arm drag force (< 0.05 N)
  • Sensor arms can be replaced quickly without any tools.
  • Knife edges can be set for round or flat specimens through simple rotation
  • Sensor arm contact pressure can be freely adjusted
  • Compression and flexure tests can be performed by simply changing the sensor arms
  • Automatic, specimen-central tracking by measuring system provides large, constant measuring range. Maximum measurement travel is always available
  • Measurement accuracy is specifically increased further in the initial measurement range by an intelligent, patent-pending drag fixture (HP version).
  • The HP version is approved for closed loop strain rate control to ISO 6892-1 (2009) Method A (1) and to ASTM E8 – 09 Method B
  • Deformation of the specimen is recorded in the elastic and plastic deformation range throughout the entire test until specimen break
  • Very high resolution and measurement accuracy over the entire measurement range
  • An EtherCAT interface is integrated into the machine electronics and extensometer as standard, eliminating the need for an additional measurement module.
  • Measured values from makroXtens are transmitted at the full testControl II data acquisition rate, ensuring that sufficient measured values are available even in rapid, short-duration tests.
  • The maktroXtens II HP with 300 mm-long sensor arms has a resolution of 0.006 μm, enabling the extensometer to continue to supply a sufficient number of measured values for tests with minimal strains/extensions (e.g. tests on ceramics, high-strength or brittle materials). This high resolution is also advantageous for strain control to ISO 6892 Method A (1).
  • makroXtens II can be combined with the motorized fine strain extensometer, allowing highly accurate initial range strain measurement to be performed separately on each side of the specimen. This is extremely important, for example, for measuring Young's modulus on metals.
  • All makroXtens II extensometers are fully upgradeable (automatic gauge-length adjustment, sensor arms for tensile, compression, flexure and temperature testing, transverse strain extensometer, fine-strain extensometer). Retrofits can be carried out quickly and easily on-site.

Function description

This multi-purpose extensometer is distinguished by its modular construction. Thus, for example, the manual operation extensometer can be converted to an automatic attaching extensometer.

  • In addition, various optional units are available to expand the functional range of makroXtens II:
  • various basic models with resolutions up to 0.006 µm
  • automatic L0 setting
  • drive unit for sensor arms
  • various sensor arms for tensile, compression, and flexure tests and for tests in temperature chambers
  • various transverse strain extensometers plus drive unit

Measuring Extension with makroXtens

1:28

Contacting makroXtens extensometer

Ideal for tensile tests, compression tests, flexure tests and cyclic tests on metals, plastics, composites, and hard foams.

Technical Overview

  • makroXtens fulfills accuracy class 0.5 to EN ISO 9513

makroXtens II for mounting on AllroundLine testing machines. Direct connection via testControl II EtherCAT interface. No additional module or module bus slot is required. Resolution in conjunction with sensor arm length

Type

makroXtens II 100, P

makroXtens II 100, HP

makroXtens II 100, CFRP/GFRP

makroXtens II 205, P

Item No.

083938

083939

1005677

083940

Accuracy to EN ISO 9513

Class 0.5 (1)[1]

Drag force

≤0.05

≤0.05

≤0.05

≤0.05

N

Resolution in conjunction with

sensor arm length 300 mm

0.06

0.006

0.006

0.06

µm

sensor arm length 450 mm

0.09

0.009

0.009

0.09

µm

sensor arm length 600 mm

0.12

0.012

0.012

0.12

µm

Initial gauge length, max.

up to 100[2]

up to 100[2]

up to 100[2]

up to 205[2]

mm

Specimen thickness/diameter, max.

30[3]

30[3]

30

30[3]

mm

Dimensions

Height

380

380

380

480

mm

Width

120

120

120

120

mm

Depth

375

375

375

375

mm

  1. Accuracy grade 0.5 when using sensor arms with a length of 300 mm and 450mm, an L0 adjustment range of 100 mm, 205 mm, and 300. Accuracy grade 1 when using longer sensor arms
  1. Initial gauge length 5 mm or greater possible with corresponding sensors (10 mm as standard) The maximum value is thereby reduced by 5 mm.
  1. Standard is 30 mm; up to 110 mm with corresponding sensors

Optional Transverse Strain Extensometer for Precise and Reproducible Measurements with makroXtens

Transverse strain extensometer

Mechanical Transverse Strain Extensometer

These are designed for measuring transverse strain during tensile tests on metals and plastics.

The transverse strain extensometer is mounted to the extensometer and can be automatically or manually attached or detached depending on the extensometer's configuration.

Mechanical Transverse Strain Extensometer

Transverse strain extensometers can be used in a temperature range of +10 to +35 °C. All transverse strain extensometers can only be used in conjunction with the AllroundLine and with the sensor arms for tensile tests (325868 oder 325874). Transverse strain extensometers can be used for r and n value determination. If the 90° swivelable transverse strain extensometer is swiveled away, if it can reach a L0 of > 10 mm, or if attached to the specimen, the L0 will increase to > 50 mm!

The manual transverse strain extensometers are connected to a control circuit board directly on the makroXtens II.

Type

Item No.

Measuring lines

Resolution
[µm]

Measurement path
[mm]

Initial gage length
[mm]

Specimen thickness, max.
[mm]

Can be swiveled out 90°, without mechanical Switchover

084635[1]

1

0.1

0 ... 6

≥10[2]

4

Can be swiveled out 90°, without mechanical switching

084636[1] [3]

1

0.002

0 ... 6

≥10[4]

4

Can be swiveled out 90°, without mechanical Switchover

082678[1]

2

0.1

0 ... 6

≥10[2]

4

Can be swiveled out 90°, without mechanical Switchover

084634[1]

2

0.002

0 ... 6

≥10[2]

4

Can be swiveled out 90°, without mechanical Switchover

060702[1]

4

0.1

0 ... 6

≥10[2]

4

Can be swiveled out 90°, without mechanical Switchover

061253[1]

4

0.002

0 ... 6

≥10[2]

4

Can be swiveled out by 15°, for varying specimen widths[5]

084637

2

0.1

4 ... 9

≥ 50[4]

4

Can be swiveled out by 15°, for varying specimen widths[5]

084638

2

0.002

4 ... 9

≥50[4]

4

  1. Not in conjunction with fine strain extensometers (item numbers 056895 and 058001)
  1. makroXtens II initial gage length
  1. You can determine Poisson's ratio only with the transverse strain extensometer item no. 084636.
  1. makroXtens II initial gauge length
  1. Through mechanical switching

The following applies to all devices: Accuracy Class 1 to EN ISO 9513

Key Advantages and Features of videoXtens Transverse Strain Extensometers  

Advantages and features

  • The system is wear-free due to the fact that no mechanically movable components are used. Costs for wear parts and continuous maintenance do not apply.
  • The videoXtens transverse strain extensometer does not need any specimen markings. It uses a highly developed edge detection algorithm. The absolute specimen width changes over time. It is determined using the specimen edges for up to five different positions.
  • videoXtens provides non-contact, high-resolution measurement of change in width, enabling determination of r values to ISO 10113.
  • The width can be determined at one or more locations (measuring lines). This allows measurement of offset yields in tensile tests to ISO 6892-1, together with r & n-values to ISO 10113 and ISO 10275.
  • The non-contact measurement method means that no contact forces emerge in the transverse direction. This makes it possible to test thin and sensitive specimens.
  • In contrast to mechanical systems, the optical measuring system can be used for very small gauge lengths (15 mm and longer with a clamping length of 50 mm).
  • The entire test sequence can be followed on the monitor and subsequent values recorded.
  • 90° deflector with precision reflectors.
  • The videoXtens transverse strain extensometer is available with a backlight screen.

Description of application

The ideal combination for the metals and automotive industries: videoXtens & makroXtens

The combination of the videoXtens transverse strain extensometer and makroXtens provides an ideal contact/optical strain measurement system for the metals and automobile industries.

The system is easy to set up and operate and is ideal for integration of robot systems thanks to a long service life and low wear and tear.

Both extensometers offer the highest level of accuracy in their class and are extremely reliable.

They are primarily used in the production-related testing of metal sheets and strips, which are used to produce body panel sheets and structural sheets.

Technical data

Type

videoXtens transverse strain extensometer

Item No.

1001420

Field of view:

Width, approx.

50

mm

Height, approx.

37.5

mm

Overall height

44

mm

Specimen width, max.

40

mm

Clamping length, min.

50

mm

Accuracy

Class 1

to EN ISO 9513

Resolution

0.25

µm

Measurement rate, max. (can be set)

166

Hz

Ambient temperature

+10 to +35

°C

Weight, approx.

1.5

kg

Scope of delivery

  • Measuring head with digital camera, lens f = 50 mm
  • Software for image acquisition and evaluation
  • Accessories case with various calibration specimens and gauge mark sets
  • Back light screen with installation kit for load frame
  • Digital measurement module
ProLine 50kN with makro extensometer and wedge grips

ProLine Makro Extensometer

The ProLine Makro extensometer is a high-resolution extensometer for tensile tests performed on metals, plastics, hard foam materials, and materials with low to average specimen strain.

 

Key Advantages and Features of ProLine Makro Extensometers  

Advantages and features

  • Deformation of the specimen is recorded in the elastic and plastic deformation range throughout the entire test until specimen break
  • Low drag force and the ability to adjust the contact force of the sensor arms as needed means you can test sensitive specimens reliably and with traceability
  • Very high resolution and measurement accuracy over the entire measurement range
  • Tiltable knife edges prevent damage to the sensor arms and knife edges at specimen break
  • The knife edge geometry can be adjusted easily and without tools by rotating the knife edges, allowing you to test flat as well as round specimens
  • Quick release fastener for sensor arms, enabling them to be replaced without the use of tools
  • Sensor arm clamping force can be adjusted steplessly
  • Centricity is automatically ensured by positioning in the test area
  • Accuracy class 1 to EN ISO 9513

Technical data

Makro-extensometer for two-column ProLine testing machines

Type

ProLine makroXtens P

ProLine makroXtens HP

Item No.

085813[1]

085814[1]

Drag force

≤0.05

≤0.05

N

Specimen width, max.

60

60

mm

Specimen thickness/diameter

30

30

mm

Ambient temperature

+10 ... +35

+10 ... +35

°C

Dimensions (H x W x D)

360 x 125 x 340

360 x 125 x 340

mm

Accuracy

Class 1

Class 1

to EN ISO 9513

Sensor arms

Resolution

0.6

0.075

µm

Sensor arm length

300

300

mm

Sensor arm opening

70

70

mm

Measurement travel

80

80

mm

Initial gauge length L0

10 ... 100 stepless

10 ... 100 stepless

mm

  1. Sensor arms with a sensor arm length of 300 mm are included in the scope of supply.

When using compression platens, adaption via a spacer (Item no. 313996) is required for the compression platens to drive together completely

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