Begin by visually and mechanically checking the method of attachment (reader to the fastener) and make sure it works well. Use a clean lint-free cotton cloth or clean nitrile gloves to gently press on the sensor surface in order to check its operation.
• Do not use your bare fingers or old work gloves. Skin oil residue left on the sensor will negatively influence the readings.
• Visually check the sensor and the fastener’s datum-disk; make sure there are no contaminants or foreign bodies (dirt, metal chips, oils, etc.). Even very small particles could negatively influence the readings.
• If any kind of liquids came in contact with the sensor, the readings might be negatively affected until the liquid is removed and any residue evaporates. Just because it looks dry does not necessarily mean it is. The readings might “drift” a few percent until the residues are gone.
• For cleaning oil or grease from the datum-disk (only), soaking the cloth with a solvent such as alcohol or acetone may be required for thorough cleaning. The use of automotive brake fluid in an aerosol can has proven successful in cleaning these contaminants. However, it must be a fast-drying formula and one that leaves no residue. Do not let the solvents and/or brake cleaner fluid reach the SPC4™ meter’s enclosure/display or reader cable.
• In the event that light rusting of the datum-disk surface has occurred, the cleaning procedure described above should be preceded by light brushing with a brass bristle brush, followed by forced, moisture free, air cleaning and wiping with a clean, lint-free, cotton cloth.