PerkinElmer Lambda 650, Hardware Manual

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Lambda 650/850/950 Hardware Guide . 59
any optical component. Optical faults of a minor nature, scratches, lint, finger marks, etc. on
the optical surfaces can easily introduce substantial analytical errors.
You should observe the following list of cell handling rules to prevent analytical errors and to
achieve utmost precision:
• Only hold cells by non-optical surfaces, such as the matt finish surfaces.
• Protect cells from scratches, and never permit them to rub against one another or
against other hard surfaces.
• Avoid abrasive, corrosive or stain-producing cleaning agents, and make certain that the
exposed surfaces of cells are optically clean.
• Always wipe the optical surfaces of cells dry and free of finger marks, using a soft cloth
or cleaning tissue, just before placing them in the cell holder.
• When measuring cold solutions, always bear in mind that condensation can form on the
optical surfaces.
• Make certain no bubbles cling to the inner surfaces of the cell, particularly when
handling cold solutions.
For maximum precision and accuracy, calibrate and test with cells of the same type, and
always insert cells into the holders with the same orientation.