LVDT Type Extensometer

Tinius Olsen's extensometers are designed to measure strain, the variation in length of a specimen divided by the specimen’s original length (gauge length). 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 positioned on a movable arm.

On these models, the movable arm is pivoted, one end is the knife edge and the other is connected to an armature that moves through an LVDT coil. A majority of these extensometers can be adapted to exact specimen holding requirements by options provided, however, in their standard form hold round or flat specimens from 1/16” to 5/8” (1.6 mm to 16 mm).

LS MODELS – English units

MODEL Measuring Range Gauge Range Calibrated Ranges Averaging Film Clamp Breakaway Release Sheet Metal Extension Bracket Pneumatic Release
LS-8%-0.53 8% 0.5 in 8%, 4%, 2%            
LS-8%-1 8% 1 in 8%, 4%, 2%  
LS-50%-1 50% 1 in 50%, 25%, 12.5%, 5%1, 2%2      
LS-8%-1.4 8% 1.4 in 8%, 4%, 2%  
LS-50%-1.4 50% 1 in 50%, 25%, 12.5%, 5%1, 2%2      
LS-4%-2 4% 2 in 4%, 2%, 1%
LS-10%-2 10% 2 in 10%, 5%, 2.5%, 1%1
LS-20%-2 20% 2 in 20%, 10%, 5%, 2%1  
LS-50%-2 50% 2 in 50%, 25%, 12.5%, 5%1, 2%2    

LS MODELS – metric units

MODEL Measuring Range Gauge Range Calibrated Ranges Averaging Film Clamp Breakaway Release Sheet Metal Extension Bracket Pneumatic Release
LS-8%-0.53 8% 12.5 mm 8%, 4%, 2%            
LS-8%-1 8% 25 mm 8%, 4%, 2%  
LS-50%-1 50% 25 mm 50%, 25%, 12.5%, 5%1, 2%2      
LS-8%-1.4 8% 35 mm 8%, 4%, 2%  
LS-50%-1.4 50% 35 mm 50%, 25%, 12.5%, 5%1, 2%2      
LS-4%-2 4% 50 mm 4%, 2%, 1%
LS-10%-2 10% 50 mm 10%, 5%, 2.5%, 1%1
LS-20%-2 20% 50 mm 20%, 10%, 5%, 2%1  
LS-50%-2 50% 50 mm 50%, 25%, 12.5%, 5%1, 2%2    

Notes
1 - must have a 10:1 strain range 2 - Optional fifth strain range required (25:1) 3 - A counterbalance support must be used 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

Options for 100R Extensometer Gallery

Averaging — In this type of extensometer, knife edges are positioned on opposite sides of the specimen to offer an average amount of strain between the two gauge points.
Film Clamps — These spring activated clamps allow precise strain measurement of thin materials up to 0.125”/3 mm thick, including foils and plastics, without disfiguring the specimen. Keep in mind that this option is only available for non-averaging extensometers and usually requires the use of a counterbalance to support the extensometer.
Breakaway Release — This option is preferably used when measuring strain on samples with fragile characteristics and which may result in premature failure. This option usually requires the use of a counterbalance to support the extensometer and is available for both non-averaging and averaging type extensometers.
Breakaway Release — This option is preferably used when measuring strain on samples with fragile characteristics and which may result in premature failure. This option usually requires the use of a counterbalance to support the extensometer and is available for both non-averaging and averaging type extensometers.
Sheet Metal Attachment — This option allows the extensometer to house thin, flat specimens. Keep in mind that this option is can only be used for non-averaging extensometers and usually requires the use of a counterbalance to support the extensometer.
Extension Bracket — This option allows the extensometer to be used with samples that are thicker than maximum opening of 0.625”/16 mm on the basic model. There are three selections with this option where an extension bracket allows the extensometer to be placed on samples that are either 3”/75 mm, 2:/50 mm, or 1”/25 mm thick. Keep in mind that this option is only available for non-averaging extensometers.
Pneumatic Release — This option is integrated with a swing away support and allows the remote release of the extensometer from the sample.
Counterbalance Support — This option is used to support the extensometer and is typically used when the extensometer is attached to small or delicate samples.

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