Ultra-miniature strain gauge is applicable for the construction of sensors and not for use in stress analysis. The backing material of this strain gauge is a polyimide with about 20μm thickness. The Karma measuring grid (3 μm) is covered with polyimide film, also with a thickness of approx. 20μm. The contact surfaces are gold-plated for easy connection of the Cu enameled wires or Teflon strands AWG44 ... AWG36. This strain gauge of the N5K series is suitable for use in the temperature range from -76 ° C to + 205 ° C.
The temperature-related drift due to expansion of the sensor body is compensated for the materials steel (variant 06) and aluminum (variant 13). 107 load cycles with alternating load ± 1800μm / m are achieved.
The gage factor of the sensor strain gage with Karma measuring grid is approx. 2.11 and is not individually identified, unlike for strain gauges for stress analysis.
