BCM SENSOR shear strain gauges are specially developed for manufacturing precision force and torque transducers which employ shear beam working principle. For the purpose of this specific application, the shear strain gauges are temperature and creep compensated, and they can be either encapsulated or open-faced according to the requirement.
The karma gauges can be manufactured with effective modulus compensation (EMC). The EMC gauges are mostly for manufacturing low-cost force transducers, because with the EMC gauges the manufacturers can eliminate the use of compensation resistors and achieve the sensitivity compensation.
For creep compensation, there are 18 creep codes: “N10, N9, N8, …, O, …, P5, P6, P7″. The “N10” is the most negative creep code, while the “P7″ is the most positive one. The “O” stands for a moderate creep code.
| Pattern |
1 grid / shear (or torsion): AB, AC; 2 grids / shear (or torsion): HA, HA(A), HA(B), HA(C) |
|---|---|
| Nominal Resistance |
350Ω, …, 3000Ω |
| Backing Material |
modified phenolic resin (F), modified polyimide resin (I), laminated polyetherketone (B), advanced laminated polyimide (A), laminated polyimide (L) |
| Working Temperature Range |
-30~+80°C for backing F, -85~+150°C for backing I, -45~+150°C for backing B, -195~+200°C for backing A, -55~+150°C for backing L |
| Tolerance Of Resistance |
<±0.1% |
| Gauge Factor |
constantan: 2.1±0.1, karma: 2.03±0.17 |
| Gauge Factor Dispersion |
<±1% |
| Maximum Working Strain |
±5000µε |
| Strain Limit |
up to ±30000µε |
| Fatigue Life |
>10^7 at 1000µε |