Strain Gage Surface Preparation (Advanced Sensors Technology)

Advanced Sensors Technology Strain gage sensors ( CEA, C4A, C5K etc.) can be satisfactorily bonded to almost any solid material if the material surface is properly prepared.
Our 5 steps are:
1. Degreasing
2. Abrading
3. Burnishing of Layout Lines
4. Conditioning
5. Neutralizing

Thoroughly degrease the gaging area with solvent, such as CSM Degreaser or GC-6 Isopropyl Alcohol. The former is preferred, but there are some materials (e.g., titanium and many plastics) that react with strong solvents. In these cases, GC-6 Isopropyl Alcohol should be considered. All degreasing should be done with uncontaminated solvents-thus the use of “one-way” containers, such as aerosol cans, is highly advisable.
Preliminary dry abrading with 220- or 320-grit silicon-carbide paper is generally required if there is any surface scale or oxide. Final abrading is done by using 320-grit silicon-carbide paper on surfaces thoroughly wetted with M-Prep Conditioner A; this is followed by wiping dry with a gauze sponge. Repeat this wet abrading process with 400-grit silicon-carbide paper, then dry by slowly wiping through with a gauze sponge. Finish with 320 grit on most steels and 400 grit on aluminum alloys. Using a 4H pencil (on aluminum) or a ballpoint pen (on steel), burnish (do not scribe) whatever alignment marks are needed on the specimen. Repeatedly apply M-Prep Conditioner A and scrub with cotton-tipped applicators until a clean tip is no longer discolored. Remove all residue and Conditioner by again slowly wiping through with a gauze sponge. Never allow any solution to dry on the surface because this invariably leaves a contaminating film and reduces chances of a good bond.
Now apply a liberal amount of M-Prep Neutralizer 5A and scrub with a cotton-tipped applicator. With a single, slow wiping motion of a gauze sponge starting within the clean area and wiping outward in one direction. Repeat the wiping step with a clean gauze pad, again, start in the clean area, wipe though the gage location moving outward in a single stroke to fully dry this surface. Do not wipe back and forth because this may allow contaminants to be redeposited.
For proper results, the procedures and techniques presented here should be used with qualified Micro-Measurements installation accessory products. Those used in this procedure are:
• CSM Degreaser or GC-6 Isopropyl Alcohol
• Silicon Carbide Paper
• M-Prep Conditioner A
• M-Prep Neutralizer 5A
• GSP-1 Gauze Sponges
• CSP-1 Cotton Applicators
• PCT Gage Installation Tape

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Las bandas extensométricas con Tecnología advanced Sensors pueden pegarse satisfactoriamente a casi cualquier material sólido, siempre que la superficie del material se prepare adecuadamente. Aunque puede lograrse de más de una manera, los procedimientos y técnicas específicas que se describen en este video ofrecen una serie de ventajas. Vídeo imprescindible con el procedimiento y materiales completo.