VEMCO - VR2C Manual
9
Jul 2018
57
6
Troubleshooting
6.1
Dented Threads
It’s very important that the threads on the VR2C housing are not dented or the lower housing will not thread
onto the upper cylinder housing properly. If the threads are slightly dented, use a sharp knife, such as an X-
Acto knife, to remove the deformed plastic until the sides of the thread are smooth and below the normal
line of the thread. It is important that there is nothing sticking out of the thread to damage the thread on the
lower housing or prevent the case from closing.
6.2
Pressurized Case
When handled correctly, the VR2C pressure case and seal have a static depth rating of 500 meters (730 psi).
If the receiver experiences a pressure greater than this, then water may enter the case.
NOTE:
Physical shocks to the receiver, such as bumping into a solid object, when it is at any depth can
result in a considerably higher pressure on the casing than just the depth pressure. Also, if the O-rings or
their mating surfaces are dirty or damaged, then water may enter the receiver case.
If water enters the receiver case under high pressure, then some water may still be in the case when it is
returned to the surface, along with compressed air. This can be identified by its increased weight and a
sloshing sound when the case is moved. The VR2C case will also be very difficult to open, if at all possible.
If you suspect there is compressed air in the receiver case, then check for air or water leaking from the
seams in the case where the main cylinder meets the hydrophone head or the main cylinder meets the lower
housing.
To check for...
Then...
water leakage
dry the seam completely and watch for drops of water around the seam
air leakage
spread soapy water around the seam and watch for bubbles indicating air escaping
If air and/or water are found leaking from the receiver case, do not attempt to open the case. Instead, place
the receiver in a safe place and cover it with a protective layer of towels, tarpaulins, etc. until the leaking
stops. If water is still in the case after the air and/or water have finished leaking from the case, then attempt
to open the case by removing the lower locking collar. If it will open, do so very slowly to allow the
compressed air to escape. If the case will not open it is still under a great amount of pressure. Contact
VEMCO for further instructions.
When the pressure has been released from the VR2C case, carefully unscrew the lower housing from the
main cylinder housing (section 5.2.2.1). Use fresh water to rinse the internal parts of the VR2C while
avoiding skin contact with any battery electrolyte that may have escaped from the battery.
Do not attempt to re-use the VR2C receiver after water has been inside the case. The internal casing
protecting the electronics is not waterproof and the electronics have been destroyed by contact with water.
