DMS Strain Gage Clip-On Extensometers

We measure even the smallest extensions or changes in width. 

These manual clip-on extensometers are attached directly to the specimen. With various preset gage-lengths they are suitable for use on metal and plastic specimens.

  • Measuring systems possess excellent linearity, providing reliable test results.
  • Gage lengths are adjustable from 10 to 100 mm, allowing flexible use for different specimen thicknesses.
  • Lightweight, miniaturized construction, ideal for short specimens.

Extension at a Glance

Advantages and features

  • Excellent linearity for reliable test results.
  • High resolutions enable measurement of very small deformations during test.
  • Lightweight, miniaturized construction, ideal for specimens with small parallel length.
  • Initial gauge length can optionally be reset from 10 to up to 100 mm using extension pieces (does not apply to Type DMS Length 1).
  • Temperature-resistant measurement systems for use from -50°C to +200°C.
  • Extensometers for two-sided measurement of specimen deformation, enabling exact determination of Young's modulus and engineering elastic limit.
  • Variable measurement options are possible on extensometers with 2 separate measurement systems; individual signals or mean-value signal can be displayed.
  • While attached to the specimen the extensometer is prevented by limit stops from exceeding the measurement travel and protected in the event of specimen break (Type DMS Length 1 only).

Description of application

The DMS Length 1 extensometer is intended for fixed gauge-lengths L0 = 25 mm and L0 = 50 mm with a measuring range of 25 mm.

Extensometer types DMS Length 2, DMS Length 3 and DMS Length 4 are intended for fixed gauge-lengths L0 = 20 mm and L0 = 10 mm with a measurement travel of 2 mm in the tensile direction and 1 mm in the compression direction.

The DMS Length 5 is a double-sided clip-on extensometer with measurement systems delivering two individual signals. It is intended for fixed gauge-length L0 = 10 mm with measurement travel of 1.5 mm in the tensile and compression directions.

DMS Length 3, DMS Length 4 and DMS Length 5 are suitable for use in temperature chambers. DMS Length 5 is also suitable for use with HCCF.

Clip-On Extensometer 5025-1, 8040-1 and 7537-1

Clip-on extensometers 5025-1, 8040-1 and 7537-1 are manual clip-on extensometers which can be clamped on to the specimen. These clip-on extensometers are heat-resistant.

In addition, clip-on extensometers 5025-1 and 8040-1 are suitable for closed-loop strain-rate control on metals to ISO 6892-1 Method A.

Clip-on extensometers 5025-1 and 7537-1 are tailored to tests on rigid plastics and composites to ISO 527. They also satisfy the requirements of Annex C for determination of tensile modulus.

Advantages and features 

  • Accuracy Class 0.5 to EN ISO 9513 up to 60% of measurement travel.
  • Clip-on extensometers 5025-1 and 8040-1 are approved for closed-loop strain-rate control to ISO 6892-1 Method A.
  • Convenient one-handed operation allows fast, easy attachment and removal of the clip-on extensometer. This enables trouble-free operation, even in narrow temperature chambers.
  • Cost-effective, high-precision extensometers for determination of strain on metals, rigid plastics and composites.
  • Lightweight construction
  • Accurate, lockable setting of initial gauge length ensures reproducible test results.
  • Suitable for tensile and compression tests

Clip-On Extensometer for metal testing to ISO 6892

The manual clip-on extensometer 5025-1 / 8040-1 are simply attached onto the sample with just one hand. Different measuring lengths, from 50 to 80 mm, can be set and thus enable the extensometer to be used variably. Due to the miniaturized and lightweight construction, the clip-on extensometer can also be used for short specimens. Another great advantage is the Accuracy Class 0.5 to EN ISO 9513 up to 60% of measurement travel.

Clip-On Extensometer: easy and accurate strain measurement for tensile tests on metals to ISO 6892

Overview

Clip-on extensometers 5025-1 and 7537-1 are tailored to tests on rigid plastics and composites to ISO 527. They also satisfy the requirements of Annex C for determination of tensile modulus.

Clip-On 5025-1

Type

Clip-on extensometer 5025-1

Item No.

1034897

Accuracy

up to 60% of measurement travel

Class 0.5 to EN ISO 9513

 

Class 1 to EN ISO 9513

Measuring system

Single-sided strain gauge system

Initial gauge length

 

50

mm

or

2

"

Measurement travel

for tensile

25

mm

for compression

5

mm

Specimen dimensions, max.

Round specimens (Ø)

20

mm

Flat specimens (d x w)

20 x 32

mm

Specimen dimensions, min.

Round specimens (Ø)

1

mm

Flat specimens (d x w)

1 x 1

mm

Ambient temperature

-70 to +200

°C

Scope of delivery

clip-on extensometer 5025-1 and knife-edges for testing metals

Overall height

66

mm

Weight

105

g

Clip-On 8040-1

Type

Clip-on extensometer 8040-1

Item No.

1067159

Accuracy

up to 60% of measurement travel

Class 0.5 to EN ISO 9513

 

Class 1 to EN ISO 9513

Measuring system

Single-sided strain gauge system

Initial gauge length

 

80

mm

or

-

"

Measurement travel

for tensile

40

mm

for compression

5

mm

Specimen dimensions, max.

Round specimens (Ø)

15

mm

Flat specimens (d x w)

15 x 30

mm

Specimen dimensions, min.

Round specimens (Ø)

1

mm

Flat specimens (d x w)

1 x 1

mm

Ambient temperature

-70 to +200

°C

Scope of delivery

clip-on extensometer 8040-1 and knife-edges for testing metals

Overall height

90

mm

Weight

118

g

Clip-On 7537-1

Type

Clip-on extensometer 7537-1

Item No.

1067160

Accuracy

up to 60% of measurement travel

Class 0.5 to EN ISO 9513

 

Class 1 to EN ISO 9513

Measuring system

Single-sided strain gauge system

Initial gauge length

 

75

mm

or

3

"

Measurement travel

for tensile

37.5

mm

for compression

5

mm

Specimen dimensions, max.

Round specimens (Ø)

15

mm

Flat specimens (d x w)

15 x 30

mm

Specimen dimensions, min.

Round specimens (Ø)

1

mm

Flat specimens (d x w)

1 x 1

mm

Ambient temperature

-70 to +200

°C

Scope of delivery

clip-on extensometer 7537-1 and knife-edges for testing plastics

Overall height

85

mm

Weight

118

g

Change in Width at a Glance

Width Strain Gage

  • For determination of Poisson's ratio on fiber-reinforced composites to ISO 527-1.
  • Selection of measuring tips to accommodate specimen dimensions.

It is designed for use in conjunction with sensor arm extensometers or without a longitudinal extensometer and is intended for specimen widths W0 = 20.5 mm to W0 = 16.5 mm. Measurement travel is 4 mm.

Biax Strain Gage

The Biax 2501-2 clip-on extensometer can be used specifically for determining extension and change in width of fiber-reinforced composite or metal specimens.

This clip-on extensometer is suitable for determination of in-plane shear strength (IPS) and Poisson's ratio.

The strain-gauge-based clip-on extensometer's wide temperature range (-70 to +175°C) makes it ideal for use in temperature chambers.

  • High temperature range -70 to +175°C
  • For determining extension and change in width of metals and fiber composites
  • Initial gauge length≥25 mm

Technical overview of change in width

Strain-gage clip-on extensometers for change in width, biaxial strain-gage clip-on extensometers and strain-gage clip-on extensometers for ProLine materials testing machines.

DMS Width

Transverse strain extensometer for AllroundLine and zwickiLine testing systems

Type

DMS Transverse

Item No.

057813

Gauge width

convertible 20.5 to 16.5

mm

Measurement travel

4

mm

Specimen thickness

0.4 to 6 (steel)

mm

Installation height

60

mm

Measured-value resolution

depends on machine electronics, see machine electronics resolution

Accuracy

Class 0.5

to EN ISO 9513

DMS Biax

Biaxial strain-gage clip-on extensometer for AllroundLine testing systems

Item No.

057806[1] [2]

Measuring system

Double-sided strain gage system

Measurement travel

For tensile

1.2

mm

For compression

0.5

mm

Measurement travel for change in width

±0.5

mm

Initial gage length L0

25

mm

Specimen dimensions:

Round specimen (Ø)

Up to 38

mm

Flat specimen width, max.

60

mm

Flat specimen thickness, max.

34

mm

Measured value resolution

Depends on machine electronics, see machine electronics resolution

Accuracy to EN ISO 9513:

-55 to +100 °C

Class 0.5

-70 to +175 °C

Class 1

Between -55 and +100 °C

Class 0.5

Outside -55 to +100 °C

Class 1

Ambient temperature

-70 to +175

°C

Overall height

39

mm

Approx. weight

200

g

Number of sensors

3

Type of output signal (extension)

Mean value

Type of output signal (change in width)

Single signal

  1. 2 x USC module required
  1. Temperature compensation available only with testXpert II Version 3.41 and above
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