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Overview

The KFRPB series foil strain gages are self-temperature-compensation gages (SELCOM gages) suitable for strain measurement of composite materials such as CFRP and GFRP.
The special gage pattern minimizes the effect of self-heating due to gage current and the effect of reinforcement of low-elasticity materials.

To ensure accurate measurement by avoiding the self-heating effect of gage current, consider the following:
1. Select a lower excitation voltage on a measuring instrument.
2. Active-dummy system
3. 350Ω strain gages

Technical Information

Major Properties
Materials Resistive element	NiCr alloy foil
Materials Base	Polyimide
Operating temperature in combination with major adhesives after curing (°C)	EP-34B: -55 to 200ºC
Operating temperature in combination with major leadwire cables (°C)	Polyester-coated copper wire: -196 to 150ºC Vinyl-coated flat cable (L-6, L-7, L-9, L-10): -10 to 80ºC Mid-temperature cable (L-11, L-12): -100 to 150ºC Fluoroplastic-coated high/low-temp. 3-wire cable (L-3): -196 to 200ºC
Self-temperature-compensation (°C)	0 to 150ºC
Applicable linear expansion coefficients (×10^-6/℃)	1, 3, 6, 9
Strain limits at normal temp. (approx. %)	2.2
Fatigue lives at normal temp. (times)	1x10^6 (±1500μm/m)

Contents

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

For the gage with 2 polyester-coated copper wires 15 cm long
→ KFRPB-5-120-C1-1 N15C2

For the gage with a vinyl-coated ?at 3-wire cable 5 m long pre-attached
→ KFRPB-5-120-D22-3 L5M3S

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

Remarks

[Notes on pre-attached lead-wire cables]

In the case of a 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.