How to connect the strain gauge Leaded

Standard connection method

 

Integral type

A vinyl leadwire is jointed to the polyimide sheathed gauge leads of a strain gauge. The solder joints are covered with the vinyl sheath of the leadwire. This is our standard method of integral leadwire attachment.

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Leadwire
Constrution Dimension (mm)
a b
2-wire paralleled LJB/LJB-F 7/0.12 1.1 2.2
LJC/LJC-F 10/0.12 1.4 2.8
2-wire twisted LH 5/0.07 0.4 -
3-wire paralleled LJBT/LJBT-F 7/0.12 1.1 3.3
LJCT/LJCT-F 10/0.12 1.4 4.2

Heat-shrinkable tubing

The soldered joint between the gauge leads and the leadwire is protected with a heat shrinkable tube. The heat shrinkable tubes are available in three temperature ratings of 80℃, 200℃ and 260℃.

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Leadwire Heat-shrinkable tube
Constrution Dimension (mm) Dimension (mm)
a b L H W
2-wire paralleled LJD 12/0.18 1.9 3.8 11 3 6
3-wire paralleled LJDT 12/0.18 1.9 5.7 11 3 7
3-wire twisted LHT 5/0.07 0.4 - 5 0.8 1.6
Cross-linked vinyl 2-wire twisted LJRA 7/0.16 0.9 - 11 2 4
Cross-linked vinyl 3-wire twisted LJRTA 7/0.127 1.1 - 11 2 4
Cross-linked polyethylene 3-wire twisted LJQTA 7/0.127 0.8 - 11 2 4
3-wire twisted LTSA 7/0.12 Φ3.0 10 2 4
LTSB 7/0.26 Φ5.0 12.5 3 6
FEP (Fluorinatedethylene-propylene) 3-wire twisted 6FB_LT 1/0.2 Φ1.1 11 2 2
6FAS_LT 7/0.18 Φ2.0 11 3 4
PTFE (Polytetrafl uoroethylene) 3-wire twisted 4FB_LT 1/0.2 Φ1.1 11 2 2
4FA_LT 7/0.16 Φ1.9 11 2.5 4

Connecting terminals joint type

The gauge leads and the leadwire are jointed using a foil shape connecting terminal. Measurement in high temperature is possible by using a high temperature solder with melting point of 300℃ or more for the joint.

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Leadwire
Constrution Dimension (mm)
PTFE(Polytetrafluoroethylene) 3-wire twisted 4FB_LT 1/0.2 Φ1.1

Insulation film type

The soldered joint between the gauge leads and the leadwire is covered with an insulation film of glass cloth base. The film is resistive to heat up to 300℃, so this method is suited to measurement in high temperature.

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Leadwire Film
Constrution Dimension (mm) Dimension (mm)
L H W
PTFE (Polytetra-fluoroethylene) 3-wire twisted 4FA_LT 7/0.16 Φ1.9 13 1.5 4

Direct type

A vinyl leadwire is jointed directly to the gauge leads, which are made of nickel plated copper. The solder joints are covered with the vinyl sheath of the leadwire up to the end of the gauge base.

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Leadwire
Constrution Dimension (mm)
Vinyhl leadwire 2-wire twisted LDA 7/0.12 Φ1.6

Single element strain gauge with different leadwire

Lead wires of different types can be combined for one strain gauge, such as a combination of heat-resistant wire and vinyl lead wire, or superfine lead wire and vinyl lead wire. It enables the use of heat-resistant wire or superfine wire in the vicinity of the strain gauge.

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