Optical comparators must receive proper care to ensure longer lifespan and retain measurement accuracy. There are few parts that require regular cleaning:
- lenses
- mirrors
- screens
Any accumulated dust must be removed from the surface of the lenses with a photographic lens brush. The surface of the inner optical comparator lens (projection or condenser) must not be touched. The element of the projection lens facing the mirror is most critical in this respect. A single finger mark on this surface will noticeably degrade the quality of the projected image. It should be noted that the projection lens element facing the work piece is far less critical.
Any grease or finger marks may be removed with a new photographic cleaning tissue. If necessary, the tissue may be moistened with methanol or lens cleaning fluid to assist cleaning.
Access to the optical comparator mirrors is gained by removing the screen. To remove grease or finger marks from the mirror surfaces use a surgical cotton wool swab soaked with methanol. Apply the swab very lightly to the mirror surface finally giving a light polish with another clean dry swab. Do not use force. All mirror surfaces should be cleaned as infrequently as possible. Never use polishes, window cleaning aerosols or liquids when cleaning the mirrors or lenses.
All optical comparator screens are made out of ground glass with printed cross lines. The cross lines can be removed if the screen is not cleaned properly. We recommend that the screens be cleaned only with soap (a mild non-lotion dish-washing solution) and plenty of water. Use a lint free soft cotton cloth to gently clean. Let the screen air dry.
If your environment is extremely dirty, please contact us about optional encapsulated image screens which cover the markings with a protective membrane.
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