KFWB Series Waterproof Foil Strain Gages
The KFWB seres foil strain gages/gauges made of polyimide have the surface covered with a special resin for waterproofing. The waterproof structure enables these gages to serve for outdoor or underwater measurement merely by being bonded to measuring objects. With CuNi alloy foil as its resistive element, the insulation resistance shows virtually no deterioration even after 100 hours of use under underwater pressure of approximately 10 MPa. In addition, the covering resin is flexible enough to enable easy bonding to curved surfaces. It has self-temperature-compensation of 10 to 80ºC, applicable linear expansion coefficients (×10-6/℃) of 11,16 and 23. It is able to withstand strain limits of approximately 2.8% at normal temperature and fatigue lives at normal temperature of up to 3x10^4 (±1500μm/m) times.
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