Ocean Instruments SoundTrap ST640 User Manual page 6

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Engage the locking screw by turning anticlockwise with supplied hex
key until screw is snug against the housing.
Warning - over tightening the locking screw can cause the housing
to leak. Stop once it is snug against the housing, no force is
required.
Seal the gap and locking screw 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.
Sealing the gap with insulation tape is important to avoid silt/mud/sand entering and eventually
working its way under the o-ring seals.
Figure 3 - Avoid silt/mud
entering the o-rings by
sealing with insulation tape

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