4
Handles
Two sets of handles are provided to facilitate operation of the submerged unit in either a
horizontal or a vertical orientation. The handles are held in place with stainless socket head cap
screws. On the right-hand side handle, a waterproof pushbutton switch, operated by the diver’s
thumb, has been incorporated to acquire spectral scans when the instrument is located
vertically, with the optical port at the bottom.
Clear Panels
The rear panel or endplate of the enclosure is constructed of transparent acrylic. This ensures
easy viewing of the instrument’s rear touchscreen LCD and controls. It is secured with four
over-center latches, used to provide the necessary seal squeeze, and sealed with a pair of
AS568-266 oil-resistant Buna-N O-rings.
The seal lines between the rear acrylic panel and main housing are visible, so as to provide a
convenient means of visually checking the sealing integrity of the Buna-N O-rings.
Caution: Always verify that the thin, black seal lines from the O-rings’ squeeze can be
seen through the rear panel. If not, determine the cause of the problem and
correct it before submerging the housing.
The front viewing port is constructed of 0.75-inch thick optical glass, sealed with one oil-
resistant Buna-N O-ring. It is not recommended that this seal be removed and reinstalled
unless unit is to be placed in storage for an extended period of time.
Always use a very light coat of silicon grease, such as Dow Corning Molykote 111 compound
when servicing the O-ring seals. Apply by hand, by wiping. Rubber gloves are recommended.
A small supply of this lubricant, a set of replacement O-rings and a removal tool are shipped
with the housing.
Both transparent panels are designed to withstand depths of up to forty meters (130 ft.).
Caution: Exercise care when removing front window retainer or seal.
The optical glass front viewing port is not fastened to the retaining ring.
Do not allow it to fall out and become damaged.
