Chapter 1 Introduction 23
used. Not only are they not required, but they could damage the finish of the surfaces on
which they are used.
Cleaning Optical Surfaces
Optical surfaces may need to be cleaned due to the accumulation of atmospheric dust. We
advise that the drag-wipe technique be used. This involves dipping a clean cellulose lens
tissue into clean anhydrous methanol, and then dragging the dampened tissue over the
optical surface to be cleaned. Do not allow any other material to touch the optical
surfaces.
Flushing and Refilling the Intensifier Chamber
Under normal conditions the front end of the detector is sealed and backfilled so there is
no danger of damage due to condensation.
Operating an Intensified PI-MAX that is no longer backfilled with dry air or dry nitrogen
may result in condensation on the array that could cause irreversible damage. Such
damage would not be covered by the Warranty.
Before a PI-MAX camera leaves the factory, its front enclosure is backfilled with clean
dry air or, in the case of the sealed-nose IVUV detector, only dry nitrogen. For proper
operation it is essential that the integrity of the front enclosure be maintained. NEVER
remove the window from in front of the intensifier or loosen the backfill port screw (see
page 199). If this enclosure should be opened to the air, the array and intensifier will be
exposed to atmospheric moisture, which could condense on the array as it cools and
possibly cause irreversible damage.
In normal operation, the front enclosure should remain sealed for the life of the detector
and should require no maintenance to assure integrity. If it should ever happen that the
front enclosure becomes unsealed, contact the factory and arrange to return the detector
to the factory where it can be properly flushed, backfilled and resealed again. See
page 232 for contact information.
Repairs
Save the original packing materials. Because the PI-MAX system contains no user-
serviceable parts, repairs must be done by Princeton Instruments. Should your system
need repair, contact Princeton Instruments customer support for instructions (telephone,
e-mail, and address information are provided on page 232 of this manual).
Use the original packing materials whenever shipping the system or system components.
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