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Waterproof Foil Strain Gages

Strain Gages

Waterproof Foil Strain Gages

Overview

Technical Information

Overview

The surface of the KFWB series foil strain gage is covered with a special waterproof resin. The waterproof structure enables these gages to serve for outdoor or underwater measurement merely by being bonded to measuring objects. (The insulation resistance shows virtually no deterioration even after 100 hours of use under an underwater pressure of approximately 10 MPa.) In addition, the covering resin is flexible enough to enable easy bonding to curved surfaces.

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Technical Information

Major Properties
Materials Resistive element	CuNi alloy foil
Materials Base	Polyimide
Operating temperature in combination with major adhesives after curing (°C)	CC-33A: -10 to 80ºC CC-36: -10 to 80ºC EP-340: -10 to 80ºC
Operating temperature in combination with major leadwire cables (°C)	Vinyl-coated flat cable (L-6, L-7): -10 to 80ºC
Self-temperature-compensation (°C)	10 to 80ºC
Applicable linear expansion coefficients (×10^-6/℃)	11, 16, 23
Strain limits at normal temp. (approx. %)	2.8
Fatigue lives at normal temp. (times)	3x10^4 (±1500μm/m)

Contents

When ordering, suffix the lead-wire cable code to the model number with a space in between.

KFWB-5-120-C1-11 with a vinyl-coated flat 2-wire cable 2 m long
→ KFWB-5-120-C1-11 L2M2R

KFWB-5-120-D17-11 with a vinyl-coated flat 3-wire cable 5 m long
→ KFWB-5-120-D17-11 L5M3S

Remarks

Notes on pre-attached lead-wire cables

Standard color of the 2-wire cable pre-attached to uniaxial gages is red (R).
　If desired, allows a white, green, yellow or black cable to be pre-attached.

Standard 3-wire cable pre-attached to uniaxial gages has red stripes (R). 　
If desired, allows the red stripes to be changed to blue or yellow stripes.

In the case of a biaxial gage and triaxial gage, 2-wire cables are color-coded with red, white and green stripes
for 0°, 90° and 45°, respectively and 3-wire cables, with red, yellow and blue stripes for 0°, 90° and 45°, respectively. 　
The letter code is S in common.