Leadwires Dedicated to Strain Gauges

Strain gauges are connected to strain measuring instruments using extension leadwires. Various types of leadwires are available for selection depending on the usage conditions. In addition, most of TML strain gauges are available with extension leadwires preattached at our factory. Those leadwire-integrated strain gauges greatly save the leadwire connection works during the strain gauge installation. Please feel free to contact TML or your local representative for the extension leadwires and the leadwire-integrated strain gauges.

Vinyl leadwires (standard length: 1m, 3m, 5m)

Vinyl leadwires are widely used as strain gauge leadwires. They are available in various types and economical. Because the vinyl insulation can be colored, these wires allow color coding for each axis of rosette or multi-axial gauges. Each core is composed of stranded wires, making the leadwire flexible and easy to handle. The leadwire end can be easily processed for connection works.

・Small diameter vinyl wires (leadwire code LH, LHT)
These leadwires feature very thin vinyl insulation and core wire, and are suited to wiring in tight spaces. Each core is composed of stranded wires to make the leadwire flexible and to minimize breakage due to repeated bending.

・Shielded vinyl wires (leadwire code LTSA, LTSB)These are 3-core wires with shield made of aluminium foil or braded copper wire. The outer sheath is made of vinyl. The shield has an effect on reducing influence of noise.

Leadwire type (Suffix code of leadwire)	Core/diameter (cross section area)	Applicable temperature (℃)	Total resistance of leadwire (Ω)	Outside sheath dimensions (mm)	Length per roll^*1 (m)	Colors
paralleled vinyl leadwire (LJB/LJB-F^*4)	7/0.12 (0.08mm²)	-20 to +80	0.44	1.1 x 2.2	200^*2	Red-White, Red, Green, Black, White, Yellow, Blue
3-wire paralleled vinyl leadwire (LJBT/LJBT-F^*4)	7/0.12 (0.08mm²)	-20 to +80	0.44	1.1 x 3.3	200^*2	White, One wire with Blue, Red, or Orange stripe ^*3
paralleled vinyl lead wire (LJC/LJC-F^*4)	10/0.12 (0.11mm²)	-20 to +80	0.32	1.4 x 2.8	200	Grey
3-wire paralleled vinyl leadwire (LJCT/LJCT-F^*4)	10/0.12 (0.11mm²)	-20 to +80	0.32	1.4 x 4.2	100	Grey, One wire with Blue stripe^*3
paralleled vinyl leadwire (LJD)	12/0.18 (0.3mm²)	-20 to +80	0.12	1.9 x 3.8	200	Grey
3-wire paralleled vinyl leadwire (LJDT)	12/0.18 (0.3mm²)	-20 to +80	0.12	1.9 x 5.7	100	White, One wire with Red stripe^*3
twisted vinyl leadwire (LH)	5/0.07 (0.02mm²)	-20 to +80	1.8	Φ0.8	-	Red, Green, White
3-wire twisted vinyl leadwire (LHT)	5/0.07 (0.02mm²)	-20 to +80	1.8	Φ1.0	-	Red, Green, White
3.2mm-dia. 2-core shielded vinyl leadwire (LS)	7/0.12 (0.08mm²)	-20 to +80	0.44	Φ3.2	200	Outer : White Core wire : Green-Green
3mm-dia. 3-core shielded vinyl leadwire (LTSA/LTSA-F^*4)	7/0.12 (0.08mm²)	-20 to +80	0.44	Φ3.0	200	Outer : Red, White or Green Core wire : Red-Black-White
5mm-dia. 3-core shielded vinyl leadwire (LTSB/LTSB-F^*4)	7/0.26 (0.3mm²)	-20 to +80	0.1	Φ5.0	200	Outer : Black Core wire : Red-Black-White
polypropylene 4-wire paralleled leadwire (LQM/LQM-F^*4)	7/0.12 (0.08mm²)	-20 to +100	0.44	0.9 x 4.0	200	White, One wire with Red, Black, or Blue stripe ^*3
3-wire paralleled special vinyl leadwire (LXT/LXT-F^*4)	7/0.12 (0.08mm²)	-20 to +150	0.44	0.9 x 2.7	200	Red-Black-White

*1: Leadwires are supplied by one roll each.
*2: Only for Red colored leadwire and 3-wire paralleled wire. The length is 400 m for others.
*3: Stripe is for distinction of independent wire in quarter bridge 3-wire connection.
*4: Lead-free solder is used for leadwires with option code "-F".

Enamel leadwires (standard length: 0.3m, 0.5m, 1m)

Enamel leadwires have a single core insulated with resin. Heat resistance and handling method vary depending on the type of resin. Because the mass and diameter of the wire are small, enamel leadwires are used for strain measurement in rotating specimens or measurement of multiple points located in close proximity.

·Polyurethane leadwire
Polyurethane leadwires allow easy post processing because the resin can be removed with a soldering iron. Since the resin is not strong, it must be handled with special care.

·Polyester leadwire
Polyester resin is harder than polyurethane resin. It cannot be removed with a soldering iron.

·Polyimide leadwire
Polyimide resin is harder than polyester resin. It cannot be removed with a soldering iron.

Leadwire type (Suffix code of leadwire)	Core/diameter (cross section area)^*1	Applicable temperature (℃)	Total resistance of leadwire (Ω)	Outside sheath dimensions (mm)	Length per roll (m)	Colors
Polyurethane leadwire^2 (LP/LP-F^3)	1/0.14 1/0.18	-10 to +120	2.5 1.5	Φ0.16 Φ0.20	-	Red, Brown, Green
Polyester leadwire^2 (LU/LU-F^3)	1/0.14 1/0.18	-196 to +200	2.5 1.5	Φ0.16 Φ0.20	-	Brown
Polyimide leadwire (LE/LE-F^*3)	1/0.14 1/0.18	-269 to +300	2.5 1.5	Φ0.16 Φ0.20	-	Brown

*1: Two types with different core diameters, which are 0.14 mm and 0.18 mm, are available for each enamel wire.
*2: Attachment of lead wiring cannot be performed on stacked-type two-element or three-element gauges.
*3: Lead-free solder is used for leadwires with option code “-F”.

Cross-linked vinyl insulated leadwires (standard length: 1m, 3m, 5m)

The cross-linked vinyl insulation provides improved resistance against environmental elements. It is often used for underwater measurement in ordinary temperature.

Leadwire type (Suffix code of leadwire)	Core/diameter (cross section area)	Applicable temperature (℃)	Total resistance of lead wire per meter (Ω)	Outside sheath dimensions (mm)	Length per roll^*1 (m)	Colors
2-wire twisted cross-linked vinyl sheathed leadwire (LJRA)	7/0.16 (0.14mm²)	-20 to +100	0.24	Φ3.0	-	White
3-wire twisted cross-linked vinyl sheathed leadwire (LJRTA)	7/0.127 (0.09mm²)	-20 to +100	0.4	Φ2.0	200	Red-Green-Black

*1: Leadwires are supplied by one roll each.

Cross-linked polyethylene insulated leadwires (standard length: 1m, 3m, 5m)

The cross-linked polyethylene insulation offers higher durability than the cross-linked vinyl insulation. The cross-linked polyethylene leadwires can be used in steam, warm water or concrete without insulation degradation.

Leadwire type (Suffix code of leadwire)	Core/diameter (cross section area)	Applicable temperature (℃)	Total resistance of lead wire per meter (Ω)	Outside sheath dimensions (mm)	Length per roll^*1 (m)	Colors
3-wire twisted cross-linked polyethylene sheathed leadwire (LJQTA/LJQTA-F^*2)	7/0.127 (0.09mm²)	-65 to +125	0.4	Φ2.0	-	Red-Yellow-Black Red-Yellow-Blue Red-Yellow-White

*1: Leadwires are supplied by one roll each.
*2: Lead-free solder is used for leadwires with option code "–F".

Fluorinated resin insulated leadwires (standard length: 1m, 3m, 5m)

With a fluorinated resin insulation, these leadwires can be used in wide range of temperature from extremely low to high temperatures. The fluorinated resin resists to most chemicals. When applying some coatings, surface treatment of the insulation (tetra-etching) is required.

Leadwire type (Suffix code of leadwire)	Core/diameter (cross section area)	Applicable temperature (℃)	Total resistance of lead wire per meter (Ω)	Outside sheath dimensions (mm)	Length per roll^*1 (m)	Colors
3-wire twisted fluorinated resin (FEP) insulated leadwire (6FA_LT/6FA_LT-F^6)^4	7/0.18 (0.18mm²)	-269 to +200	0.2	Φ2.0	100	Red-Green-Blue
3-wire twisted fluorinated resin (FEP) insulated leadwire^5 (6FAS_LT/6FAS_LT-F^6)^*4 (Surface treatment(tetraetching) is not required)	7/0.18 (0.18mm²)		0.2	Φ2.0	100	Red-Green-Blue
3-wire twisted fluorinated resin (FEP) insulated leadwire (6FCS_LT/6FCS_LT-F^6)^4 (Surface treatment(tetraetching) is not required)	7/0.08 (0.04mm²)		1.1	Φ1.0	-	Red-Black-White
3-wire twisted fluorinated resin (FEP) insulated leadwire (6FB_LT/6FB_LT-F^6)^4	1/0.2		1.2	Φ1.1	-	Red-Green-Blue
3-wire twisted fluorinated resin (FEP) insulated leadwire (6FC_LT/6FC_LT-F^6)^4	7/0.08 (0.04mm²)	-269 to +200	1.1	Φ1.0	-	Red-Black-White
3-wire twisted fluorinated resin (FEP) insulated leadwire (6FD_LTS)^*4	7/0.08 (0.04mm²)	-269 to +200	1.1	Φ1.5	-	Red (Red-Black-White)
3-wire twisted fluorinated resin (PTFE) insulated leadwire (4FA_LT / 4FA_LT-F^6)^4	7/0.16 (0.14mm²)	-269 to +260^*3	0.24	Φ1.9	100	Red-Black-White
3-wire twisted fluorinated resin (PTFE) insulated leadwire (4FB_LT/4FB_LT-F^6)^4	1/0.2	-269 to +260^*3	1.05	Φ1.1	-	Red-Black-White

*1: Leadwires are supplied by one roll each.
*2: _ is filled with the lead wire length in meter
*3: PTFE leadwire is available for use in 300°C for a short term
*4: Suffix code LT(CT) means connecting terminal joint, while LT(TA) means insulation with film
*5: for easy application of coating: Surface treatment (tetra-etching) is not required when applying coating
*6: Lead-free solder is used for leadwires with option code "–F".

Integral lead wire dedicated to temperature-integrated strain gauges (standard length: 1 m, 3 m, 5 m)

These are leadwires dedicated to temperature-integrated strain gauges. One lead wire is composed of two copper wires (red and blue) and one constantan wire (white). When extending the leadwire, use the dedicated leadwire correctly.

Leadwire type (Suffix code of leadwire)	Core/diameter (cross section area)	Applicable temperature (℃)	Total resistance of lead wire per meter (Ω)	Outside sheath dimensions (mm)	Length per roll (m)	Colors
Temperature-integrated 3-wire paralleled vinyl lead iwre (TLJBT/TLJBT-F^*3)	7/0.12 (0.08mm²)	-20 to +80	0.44^*1	1.2 x 3.6	-	Red-White-Blue
Temperature-integrated 3-wire twisted fluorinated resin (FEP) leadwire (6FB_TLT/6FB_TLT-F^3)^2	1/0.2	-269 to +200	1.2^*1	Φ1.1	-	Red-White-Blue

*1: Total resistance of copper wire per meter
*2: _ is filled with the lead wire length in meter
*3: Lead-free solder is used for leadwires with option code "-F".
*: For the method of connection to a strainmeter, refer to the operation manual of the strainmeter.