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LVDT Type Extensometers0 pages
Bulletin
TD-2001
LVDT Type Extensometers
Extensometers measure
strain, the change in length
of a specimen divided by
the original length (gauge
length) of the specimen.
An extensometer measures
strain by means of knife
edges that contact the
sample, one of which is
fixed in its position, and the
other which is located on
a moveable arm. On these
models, the moveable arm is pivoted,
one end is the knife edge and the
other is attached to an armature that
moves through an LVDT coil. Most of
these extensometers can be adapted
to your exact specimen holding needs
by the options that are described on
the back page, but in their standard
form hold flat or round specimens
from 1/16” to 5/8” (1.6 mm to 16 mm).
LS Models — English Units
MODEL
Measuring
Range
Gauge
Length
Calibrated
Ranges
LS-8%-0.53
LS-8%-1
LS-50%-1
LS-8%-1.4
LS-50%-1.4
LS-4%-2
LS-10%-2
LS-20%-2
LS-50%-2
0.5 in
1 in
1 in
1.4 in
1 in
2 in
2 in
2 in
2 in
8%, 4%, 2%
8%, 4%, 2%
50%, 25%, 12.5%, 5%1, 2%2
8%, 4%, 2%
50%, 25%, 12.5%, 5%1, 2%2
4%, 2%, 1%
10%, 5%, 2.5%, 1%1
20%, 10%, 5%, 2%1
50%, 25%, 12.5%, 5%1, 2%2
Gauge
Length
Calibrated
Ranges
12.5 mm
25 mm
25 mm
35 mm
35 mm
50 mm
50 mm
50 mm
50 mm
8%, 4%, 2%
8%, 4%, 2%
50%, 25%, 12.5%, 5%1, 2%2
8%, 4%, 2%
50%, 25%, 12.5%, 5%1, 2%2
4%, 2%, 1%
10%, 5%, 2.5%, 1%1
20%, 10%, 5%, 2%1
50%, 25%, 12.5%, 5%1, 2%2
8%
8%
50%
8%
50%
4%
10%
20%
50%
LSM Models — Metric Units
Measuring
MODEL
Range
LSM-8%-12.53
LSM-8%-25
LSM-50%-25
LSM-8%-35
LSM-50%-35
LSM-4%-50
LSM-10%-50
LSM-20%-50
LSM-50%-50
8%
8%
50%
8%
50%
4%
10%
20%
50%
Averaging
Film
Clamp
Breakaway
Release
Sheet
Metal
Extension
Bracket
Pneumatic
Release
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Averaging
Film
Clamp
Breakaway
Release
Sheet
Metal
Extension
Bracket
Pneumatic
Release
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Notes
3 - A counterbalance support must be used
1 - must have a 10:1 strain range
2 - Optional fifth strain range required (25:1)
Standard extensometers can be used at temperatures from -100 to 250 °F (-75 to 120 °C) or with modifications from -300 to 500°F (-185 to 260°C) denoted suffix T
