2 Quick start guide
2.1 Opening and closing the housing
Before opening an underwater housing always check for flooding by shaking and listening for
water sloshing around inside. If flooding is suspected, then be aware that the housing may be
pressurised and therefore potentially dangerous. Carefully relieve any pressure by opening the
small seal screw at the base of the housing.
Opening the housing:
• Ensure the housing is dry and free of fouling.
• Use the supplied 4mm hex key to release the lock screw
by turning clockwise unit the screw bottoms out (figure 1).
• Hold recorder with the hydrophone facing downward to
ensure any remaining water won’t run down into the
housing.
• Open the top with a twist and pull motion, ensuring the
hydrophone remains pointing downward.
• Where seal is tight you may need to use a screw driver (in
the slots provided) to gently lever the top open.
Closing the housing:
• Carefully check the O’rings. Any nicks or scratches
indicate they must be replaced.
• Lubricate O’rings with silicone grease.
• Check O’rings are properly seated and absolutely free of
stray hair/grit etc
• Insert the chassis in the housing, turning to align the locking screw.