KFRB series General-purpose Foil Strain Gages


The KFRB series foil strain gages are durable and easy-to-use high-grade strain gages. The gage element is sandwiched between heat-resistant polyimide base and cover, thereby letting it exhibit high performance in a wide temperature range.


The KFRB subminiature 5-element gage is a strain gage to measure stress concentration whose grid-element pitch and gage length are minimized as much as possible so as to be installed to corners and edges of the specimen to be measured, and this can measure local stress and stress distribution.
Unless directly exposed to water drop, no coating treatment is required.
The metal foil of conventional foil strain gages has the electric resistance changed by receiving hydrogen effect, thereby disabling stable strain measurement.

Structure of a Foil Strain Gage
The foil strain gage has metal foil on the electric
insulator of the thin resin, and gage leads attached, as shown in Fig. 1 below. The strain gage is bonded to the measuring object with a dedicated adhesive. Strain occurring on the measuring site is transferred to the strain
sensing element via adhesive and the resin base.
For accurate measurement, the strain gage and adhesive should be compatible with the measuring material and operating conditions such as temperature, etc.


When ordering, suffix the lead-wire cable code to the model number with a space in between. (Except for D9 and D19)

KFRB-02N-120-C1-11 With 2 polyester-coated copper wires 10 cm long
→ KFRB-02N-120-C1-11 N10C2

KFRB-05-120-D25-11 With a vinyl-coated flat 3-wire cable 5 m long
→ KFRB-05-120-D25-11 L5M3S

If no lead-wire cable code is suffixed, the gage is delivered with gage leads only.
(Silver-covered copper wires 25 mm long)

For details, please refer to the [Strain Gages with Pre-attached Lead Cables]