KFRS Series
Foil Strain Gages for Printed Boards

Summary

PCB are used for varieties of products including cellular phones, car navigation systems and digital cameras.
The gages are the self-temperature-compensation gages (SELCOM gages) for evaluating them.

Click here for the [Typical Strain Gage Bonding Procedure]
Click here for the [Strain Gages with Pre-attached Lead Cables]

Features

∙ Dimensions of gage base (bondable space to mounted components and narrow parts)
　1.2 mm long by 1.1 mm wide (uniaxial), 2.5 mm long by 2.5 mm wide (biaxial or triaxial)
∙ Linear expansion coefficient of 13 x 10^-6/ºC, suitable for component-mounted board
∙ Self-temperature-compensation range is made as wide as –30 to 120ºC to satisfy thermal cyclic tests of PCB.

Major Properties

Materials Resistive element	NiCr alloy foil
Materials Base	Polyimide
Operating temperature in combination with major adhesives after curing (°C)	CC-33A: -196 to 120ºC CC-36: -30 to 100ºC PC-600: -196 to 150ºC
Operating temperature in combination with major leadwire cables (°C)	Polyester-coated copper wire: -196 to 150ºC Vinyl-coated flat cable (L-6, L-7): -10 to 80ºC Mid-temperature cable (L-11, L-12): -100 to 150ºC
Self-temperature-compensation (°C)	-30 to 120ºC
Applicable linear expansion coefficients (×10^-6/℃)	13
Strain limits at normal temp. (approx. %)	1.6
Fatigue lives at normal temp. (times)	2x10⁶ (±1500μm/m)

Relative images

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

E.g.
For the gage with 3 polyester-coated copper wires 10-cm long pre-attached
→ KFRS-02-120-C1-13 N10C3

For the gage with a vinyl-coated ﬂat 3-wire cable 5 m long pre-attached
→ KFRS-05-120-D35-13 L5M3S

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