Dakota Ultrasonics UMX - Manual (Page 3)

3
CARE AND MAINTENANCE
The body of the housing is made of acrylic plastic, a material that is well suited
for this application, but with certain limitations which must be observed:
1. Keep the housing out of direct sunlight as much as possible. The material is
subject to crazing, a surface cracking phenomenon, which does not affect
its strength. Crazing is caused by ultraviolet radiation, present in sunlight.
The closed clear box is a greenhouse and will heat quickly if left in direct
sunlight. Heat is hard on optical and electronic components, so keep the
housing covered or shaded as much as possible.
2. Protect the housing from impact. The material will shatter if subjected to
sufficient shock. A carrying case is recommended to keep the housing out
of direct sunlight and to protect it while the unit is in use.
3. Rinse the outside surfaces with fresh water after use. The plastic and
stainless steel fittings are impervious to salt water, but will lose their luster if
even small amounts of salt are allowed to accumulate. Use WD-40 on the
joints of the stainless steel latches.
4. WARNING: Do not exceed the depth limitation of the housing as specified
on the following page. Failure to heed this warning may result in leakage
and possibly implosion and serious injury.
The housing is sealed by o-rings, which require meticulous care. In order to
maintain a watertight seal, the o-rings and their mating surfaces must be clean,
free of foreign material, and lubricated with silicone grease.
The following procedure must be performed on the access door o-ring
before each use:
1. Clean all old silicone grease from o-rings and mating surfaces using paper
towels.