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Medidores cilíndricos (LB11/TB21)

Owing to their convenient size and cylindrical shape, the LB11 and TB21 strain gauges are ideally suitable for measurements in screws and bolts.

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LB11 & TB21: Strain Gauges for Measurements in Screws and Bolts

Bolts are a common construction element used to connect various components. The LB11 and TB21 series of cylindric strain gauges with lead wires, have especially been designed to measure strain, force, and vibration in bolts, screws, and other axial construction elements.

They have been equipped with copper leads and can be used directly in pre-drilled bolt elements. For this, a 2 mm drilling in the structure is required. Both, LB11 and TB21, come as a tubular strain gauge that can be used in a temperature range of –200°C to +140°C.

The LB11 has a linear measuring grid in the strain direction. It is suitable for quarter-bridge applications and has a resistance of 120 Ω.
The TB21 has two measuring grids arranged at 90° and is connected as a half-bridge. This allows for an improved temperature compensation at varying temperatures. The temperature compensation at +-5 °K temperature change causes a drift in the range of 0 to 80 µm/m, depending on the screw and the installation. This is due to the geometry of the application and differs significantly from installations on planar objects. The resistance of the strain gauge is 1000 Ω (+/- 1%).

Compact

Used for nominal drillings of 2 mm
Cylinder height: 11.5 mm
Measuring grid: 3 mm

Facilitates strain, force, and vibration measurements in the most confined spaces.

Resistant

Comes with temperature response compensation for steel
Resistance: 120 Ω (LB11) / 1000 Ω (TB21)

Ideally matched to the needs of the measurement application.

Immediately available

Available, in stock
Equipped with 60 mm copper leads

Save your time and try it right away!

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Code	Geometria	Largura do suporte	Resistência nominal	Configuração de conexão
1-LB11-3/120ZW	Linear, Linear	6 mm	120 Ohms, 120 Ohm	Leads, Fitas de ligação
1-TB21-3.3/1000HW	T rosette, Roseta em T	1.9 mm	1000 Ohms, 1000 Ohm	Enamelled copper wires, Fios de cobre esmaltado

LB11 - Folha de dados	Data Sheets	English
TB21 - Folha de dados	Data Sheets	English
LB11 - Folha de dados	Data Sheets	German
TB21 - Folha de dados	Data Sheets	German

Certificates and Approvals

Strain Gauges - Declaração de conformidade

Declaration of Conformity

English

Cylindrical Gauges (LB11/TB21)
Type/technology	Foil strain gauge
Application	Stress Analysis / structural testing
Geometry	Linear, T rosette
Measuring grid length	3 mm
Measuring grid length	0.118 in
Measuring grid width	5 mm
Measuring grid width	0.197 in
Carrier length	11.5 mm
Carrier length	0.453 in
Carrier width	6 mm, 1.9 mm
Carrier width	0.236 in
Temperature range	Limited temperature range
Nominal resistance	120 Ohms, 1000 Ohms
Gauge factor (measuring grid material)	Constantan (ca 2.0)
Temperature response	Ferritic steel (10.8 ppm/K; 6.0 ppm/°F)
Maximum elongation	Standard
Fatigue life	Standard
Connection configuration	Leads, Enamelled copper wires
Mounting	Embeddable
Grid protection	Open face

List of accessories available for all variants of this family

Product Code	Description
1-EP70	Meio fix. bi-comp. endur. quente EP70
1-RMS1-300	RMS1 mistura de solventes 300 ml
K-KAB-ML	Measurement cable by the meter

Saiba como instalar o LB11 ou o TB21

A instalação de extensômetros cilíndricos em parafusos difere das instalações convencionais em superfícies planas. Saiba integrar este medidor especial num parafuso.