Quick Start Guide; Opening And Closing The Housing - Ocean Instruments SoundTrap ST400 User Manual

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 hazardous. Carefully relieve any by wring the housing in a towel and
opening at arm's length.
Opening the housing:
•
Dry the with a towel so housing is completely dry before opening.
•
Hold recorder with the hydrophone facing downward to ensure any remaining water won't
run down into the housing.
•
Twist the housing anticlockwise to release the lock.
•
Gentry pull the chassis from its housing.
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.
•
Lock the housing closed by turning the chassis clockwise until end of travel.
•
Where heavy fouling is likely to occur, we recommend sealing the gap by means of a couple
of turns of insulation tape (figure 2).
•
Replacement O'Rings should be type 48x3 N70 (Nitrile)
The O'ring checks are critically important to avoid damage. Any detritus or damage to the O'rings
may result in the housing being flooded which will almost certainly destroy the electronics.