11
Sealing Housing
Pay special attention to make sure the o-ring in the top of the lid stays in place
and does not fall down when screwing the lid on.
The housing lid should be hand-tightened.
DO NOT USE THE STRAP WRENCH TO CLOSE THE LID!
Vent Plug
Some versions of the DSG-ST have a vent
plug.
This plug is only to be used if there is a
leak in the housing.
A leak in the housing can be dangerous because the housing will pressurize internally
to
the same pressure
as the depth of deployment.
If there is a leak, it is critical to relieve the pressure before removing the lid, otherwise
the lid could fly off.
The vent plug can be used to relieve the pressure, by turning it slowly until you start
hearing air come out. Once air starts coming out, stop unscrewing and wait until air
stops coming out. The vent plug is designed to stay in the endcap and safely vent air
through holes machined in the plug.
Once the internal pressure has equalized, you may remove the top lid with the
hydrophone. There is no need to fully remove the vent plug. Then gently retighten the
vent plug. On PVC housings be very careful
not to overtighten the plug
, otherwise
the threads in the bottom endcap may strip.
