Instron 2630-100 Series Manual

M20-52630-1
Issue C January 1997
Instron
2630-100 Series Clip-On
Extensometers
Operator’s Guide

PROPRIETARY RIGHTS NOTICE
This document and the information that it contains are
the property of Instron Corporation. Rights to
duplicate or otherwise copy this document and rights
to disclose the document and the information that it
contains to others and the right to use the information
contained therein may be acquired only by written
permission signed by a duly authorised officer of
Instron Corporation.
© Copyright 1997 Instron Corporation

Amendment Incorporation Record
AMENDMENT
NUMBER BRIEF DESCRIPTION OF CONTENT
NAME OF
PERSON
INCORPORATING
AMENDMENT
1Additional information covering Phase 2 and
Phase 3 extensometers Siân Oakes
2Wire clip information amended. Issue raised to
C, ECR35152 Siân Oakes
3
4
5
6
7
8
9
10
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Amendment Incorporation Record
AMENDMENT
NUMBER BRIEF DESCRIPTION OF CONTENT
NAME OF
PERSON
INCORPORATING
AMENDMENT
11
12
13
14
15
16
17
18
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20
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GENERAL SAFETY PRECAUTIONS
Materials testing systems are potentially
hazardous!
Materials testing involves inherent hazards
from high forces, rapid motions and stored
energy. You must be aware of all moving and
operating components which are potentially
hazardous, particularly the actuator in a
servohydraulic testing system or the moving
crosshead in an electromechanical testing
system.
Always be aware of the possible hazards
involved when operating and maintaining these
systems. You must not operate any materials
testing equipment unless you are thoroughly
familiar with its functions and operation.
Unfamiliarity with a materials testing system
can lead to unexpected actuator or crosshead
motion with the consequent risk of injury and
damage.
Carefully read all relevant manuals and observe
all WARNINGS and CAUTIONS. The term
WARNING is used where a hazard may lead to
injury or death. The term CAUTION is used
where a hazard may lead to damage to
equipment or to loss of data.
Ensure that the test set-up to be followed and
the actual test to be performed on materials,
assemblies or structures constitutes no hazard
to operating personnel.
Make full use of all mechanical and electronic
limits features. These are supplied for your
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v M20-52630-1

safety to enable you to prevent movement of
the actuator piston / moving crosshead beyond
the desired regions of operation.
The following pages detail various general
warnings that you must heed at all times while
using materials testing equipment. More
specific warnings and cautions will be found in
the text whenever your attention needs to be
drawn to a potential hazard.
Your best safety precautions are to gain a
thorough understanding of the equipment by
reading your instruction manuals and to always
use good judgement.
WARNING
DISCONNECT THE ELECTRICAL
POWER SUPPLY BEFORE
REMOVING THE COVERS OF
ELECTRICAL EQUIPMENT
You must disconnect the equipment from the
electrical power supply before removing any
electrical safety covers or replacing fuses. Do
not reconnect the main power source while the
covers are removed unless you are specifically
instructed to do so in the manual. Refit covers
as soon as possible.
DISCONNECT POWER SUPPLIES
BEFORE REMOVING THE COVERS
OF ROTATING MACHINERY.
You must disconnect the equipment from all
power supplies before removing any cover
Preliminary Pages
vi

which gives access to rotating machinery, e.g.
belts, screws or shafts. Do not reconnect any
power supply while the covers are removed
unless you are specifically instructed to do so
in the manual. If the equipment needs to be
operated to perform maintenance tasks with the
covers removed, ensure that all loose clothing,
long hair, etc. is tied back. Refit covers as soon
as possible.
WARNING
SHUT DOWN THE HYDRAULIC
POWER SUPPLY AND DISCHARGE
HYDRAULIC PRESSURE BEFORE
DISCONNECTION OF ANY
HYDRAULIC FLUID COUPLING.
Do not disconnect any hydraulic coupling
without first shutting down the hydraulic power
supply and discharging stored pressure to zero.
Tie down or otherwise secure all pressurised
hoses to prevent movement during system
operation and to prevent the hose from
whipping about in the event of a rupture.
SHUT OFF THE SUPPLY OF
COMPRESSED GAS AND
DISCHARGE RESIDUAL GAS
PRESSURE BEFORE
DISCONNECTION OF ANY
COMPRESSED GAS COUPLING.
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vii M20-52630-1

Do not release gas connections without first
disconnecting the gas supply and discharging
any residual pressure to zero.
WARNING
USE PROTECTIVE SHIELDS OR
SCREENS IF ANY POSSIBILITY OF
A HAZARD EXISTS FROM THE
FAILURE OF A SPECIMEN,
ASSEMBLY OR STRUCTURE UNDER
TEST.
Protective shields should be used whenever a
risk of injury to operators and observers exists
from the failure of a test specimen, assembly or
structure, particularly where explosive
disintegration may occur. Due to the wide
range of specimen materials, assemblies or
structures that may be tested using materials
testing equipment, any hazard resulting from
the failure of a test specimen, assembly or
structure is entirely the responsibility of the
owner and user of the equipment.
PROTECT ELECTRICAL CABLES
FROM DAMAGE AND
INADVERTENT DISCONNECTION.
The sudden loss of controlling and feedback
signals which can result from a disconnected or
damaged cable causes an open loop condition
which may drive the actuator of crosshead
rapidly to its extremes of motion. All electrical
cables, particularly transducer cables, must be
Preliminary Pages
viii

protected from damage. Never route cables
across the floor without protection, nor suspend
cables overhead under excessive strain. Use
paddings to avoid chafing where cables are
routed around corners or through wall openings.
WARNING
WEAR PROTECTIVE CLOTHING
WHEN HANDLING EQUIPMENT AT
EXTREMES OF TEMPERATURE.
Materials testing is often carried out at
non-ambient temperatures using ovens,
furnaces or cryogenic chambers. Extreme
temperature means an operating temperature
exceeding +60 °C (140 °F) or below 0 °C
(32 °F). You must use protective clothing, such
as gloves, when handling equipment at these
temperatures. A warning notice concerning low
or high temperature operation must be
displayed whenever temperature control
equipment is in use. You should note that the
hazard from extreme temperature can extend
beyond the immediate area of the test.
TAKE CARE WHEN INSTALLING OR
REMOVING A SPECIMEN,
ASSEMBLY OR STRUCTURE.
Installation or removal of a specimen, assembly
of structure involves working inside the hazard
area between the grips or fixtures. Keep clear
of the jaws of a grip or fixture at all times.
Keep clear of the hazard area between the grips
or fixtures during actuator or crosshead
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ix M20-52630-1

movement. Ensure that all actuator or
crosshead movements necessary for installation
or removal are slow and, where possible, at a
low force setting.
WARNING
BEFORE THE EXTENSOMETER IS
USED IN STRAIN CONTROL,
CHECK THE FOLLOWING:
1. Ensure that the extensometer
is securely attached to the
specimen.
2. Ensure that the extensometer
is calibrated.
3. Set the Load, Position and
Strain limits.
4. Ensure that the testing
machine loop-shaping
parameters are set correctly.
BEFORE REMOVING THE
EXTENSOMETER FROM THE
SPECIMEN AT ANY TIME, ENSURE
THAT THE MACHINE IS NOT IN
STRAIN CONTROL!
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Preliminary Pages
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Table Of Contents
Chapter Page
INTRODUCTION 1-1
GENERAL 1-1
BASIC FEATURES 1-2
EQUIPMENT SUPPLIED 1-4
OPTIONAL ACCESSORIES & SPARES 1-4
SPECIFICATION 2-1
ENVIRONMENTAL 2-1
OPERATION 3-1
GAUGE LENGTH SETTING 3-1
SPECIMEN ATTACHMENT 3-3
Wire Clip 3-3
Variable Pressure Specimen
Clamp 3-5
Elastic Bands or O-Rings 3-7
Fitting to the Specimen using
Both Hands 3-8
Fitting to the Specimen using
One Hand 3-9
CABLE CLEAT AND EXTENSOMETER
HOLDER 3-10
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KNIFE EDGE CHANGING 3-12
Specimen Centering Stops 3-13
IMPORTANT SAFETY NOTE 3-14
CALIBRATION 3-15
Automatic Electrical
Calibration 3-15
Manual Electrical
Calibration 3-16
Manual Mechanical
Calibration 3-18
VERIFICATION 3-19
APPENDIX A
CLIP SIZES A-1
CLIPS FOR ROUND SPECIMENS A-2
CLIPS FOR RECTANGULAR
SPECIMENS A-4
Notes A-6
Preliminary Pages
xii

LIST OF ILLUSTRATIONS
Figure Page
1-1. Case Layout 1-5
3-1. Gauge Length Setting with the
cone-latch released 3-1
3-2. Gauge Length Setting with the
cone-latch engaged
(gauge length set) 3-2
3-3. Insertion of Clips 3-4
3-4. Wire clips in use 3-4
3-5. Specimen attachment using the
optional Specimen Clamps
and Pivot Knife Edges 3-6
3-6. Specimen attachment using
elastic bands 3-7
3-7. Two-handed Installation 3-8
3-8. Single-handed Installation 3-9
3-9. Extensometer suspended from
cleat post — T-slot machines 3-10
3-10. Extensometer suspended from
cleat post — steel covered
machines 3-11
3-11. Knife Edge Replacement 3-12
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xiii M20-52630-1

3-12. Specimen Stops 3-13
3-13. Extensometer mounted on an
optional calibration fixture
(Cat. No. 2602-017) 3-17
List of Tables
Table Page
1. Extensometer Gauge Lengths
and Travel 2-1
2. General Specification 2-3
3. Machine Compatibility 2-5
4. Extensometer Physical
Compatibility with 3119 Series
Temperature Chambers 2-8
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xiv

INTRODUCTION
GENERAL
The 2630-100 series extensometers convert
the mechanical displacement of a strained
test specimen into an electrical signal. When
used with the current range of Instron
testing machines, each extensometer is
automatically recognised, and is able to be
calibrated at the touch of a button.
The displacement is transmitted by a light
rigid frame to strain gauges bonded to a
flexural element. The gauges are arranged in
a fully active four-arm Wheatstone Bridge
circuit.
The 2630-100 series of extensometers
includes different gauge lengths/strain range
options to suit a wide range of specimen
characteristics.
Robust construction provides accuracy and
reliability. As with all measuring
instruments, rough handling, contamination
with dirt and moisture effect calibration and
shorten the life of the instrument.
The extensometer is supplied in a
foam-lined presentation case, dimensions
350 mm (13.8 in.) long, 260 mm (10.2 in.)
wide and 85 mm (3.3 in.) deep. The
shipping weight is 0.9 kg (2 lbs).
When not in use, the extensometer should
be stored in the presentation case.
INTRODUCTION
1-1 M20-52630-1

BASIC FEATURES
•Ergonomic, lightweight,
cross-braced design with overload
protection.
•Easy attachment and release from
the specimen facilitate
single-handed operation.
•Simple, cone latch gauge-length
setting method with automatic
disengagement.
•Precise, fixed gauge-lengths with
automatic recognition and
calibration capability.
•Available in metric and U.S.
Customary versions to meet
ISO 9513 and ASTM E83
standards of accuracy.
•Low operating-force arms with
single-bevel, interchangeable knife
edges.
•Suitable for a wide range of
specimen materials, geometry and
size with a choice of attachment
methods.
•Combined cable cleat and
extensometer holder with
provision for retaining cord
attachment to the extensometer.
•High impact plastic storage case
with a contour moulded insert,
securely retains the extensometer
INTRODUCTION
1-2

and accessory parts together with
its Calibration Certificate and
comprehensive operating manual.
INTRODUCTION
1-3 M20-52630-1

EQUIPMENT SUPPLIED
Refer to Figure 1-1.
1 Extensometer
2 Cable cleat and extensometer holder
3 Allen key
4 11 pairs of wire clips
5 Specimen centering stops
6 Operator’s guide
7 Calibration certificate
8 Foam lined presentation case
OPTIONAL ACCESSORIES &
SPARES
1 Variable pressure specimen clamps: see page 3-5.
2 Replacement knife edges, one pair, straight
profile. All purpose use on round and rectangular
cross section specimens. Cat No. 2601-077.
3 Replacement knife edges, one pair. Three point
contact for flat specimens that are not truly flat.
Cat No. 2601-078.
4 Replacement knife edges one pair. Radiused edge
for flat specimens that are not truly flat.
Cat No. 2601-079.
5 Digital Readout Extensometer Calibrator for manual
span setting. Cat No. 2602-017.
7 Wire clips (see Appendix A).
8 O-Rings, internal diameter 11 mm unstretched.
(Instron Part No. T1351-1034).
INTRODUCTION
1-4

CASE OPERATOR’S GUIDE
ALLEN
KEY
CLIPS FOR RECTANGULAR
SPECIMENS
CLIPS FOR ROUND
SPECIMENS
EXTENSOMETER CABLE CLEAT AND
EXTENSOMETER HOLDER
SPECIMEN
STOPS
Figure 1-1. Case Layout
INTRODUCTION
1-5 M20-52630-1