CAUTION:
The Lubell VC2C is for sale to marine scientists and laboratories, ocean engineers, and the
military. Set-up and operation of the VC2C must be supervised by an engineer having a
background in ocean engineering, due to special pressure compensation requirements and
potentially harmful sound levels.
WARNING:
MUST BE GROUNDED
VC2C MUST BE PRESSURIZED TOPSIDE BEFORE DEPLOYMENT AT FIXED
OPERATING DEPTH PER ATTACHED INFLATION SCHEDULE
DO NOT DEPRESS THE SCHRADER VALVE CORE PIN IN THE WATER
1. Equipment operator should wear dry rubber-soled shoes while setting up and operating equipment.
2. Inspect all equipment and cordage before use. Do not use equipment if cords are damaged.
3. Set up a wood or plastic insulated equipment table in a dry sheltered area keeping a minimum
distance of 10’ from the water. Keep equipment securely fastened in place if using on a boat or ship.
4. Attach a sturdy 3/8 inch three-strand polypropylene rope of sufficient length to the attachment eyelet
on the VC2C underwater acoustic transducer. Depth markers should be placed on the rope in 1 foot
intervals to determine the operating depth of the VC2C when deployed from vessel.
5. After lightly lubricating the pins with silicone grease, attach the Seaconn MCIL3F//MCDLS-F 50’
SOOW cable to the mating SUBCONN MCBH3MSS bulkhead connector fitted on the VC2C
underwater speaker. IMPORTANT: Strain relief a loop in the SO cable using HD nylon cable
ties so as to prevent any strain on the bulkhead connector. Failure to follow this procedure
may result in damage to the bulkhead connector, which will require factory replacement.
6. GROUNDING: Ground the VC2C to an approved ship ground or tank ground via the green
conductor in the SOOW cable.
7. IMPORTANT: Before lowering the VC2C underwater speaker into the water (from dry deployment
area), depress the Schrader valve core pin to equalize (zero out) the internal air pressure of the VC2C
with that of the surrounding atmospheric pressure.
8. IMPORTANT: Verify that both of the VC2C’s piston-stop gaps are precisely set to 0.016 inches,
and that the set-screw lock-nut is securely tightened.
9. Determine and record the proposed operating depth for the VC2C tests.
10. The VC2C must then be precisely inflated with the supplied hand pump to the correct pressure
corresponding to the intended depth of operation per following schedule: Freshwater: 0.433 psi x
depth of operation in feet; Saltwater: 0.444 psi x depth of operation in feet. When pressurized, the
piston-stop gaps will close while on the platform, but will then return to the preset 0.016 inch gap
once the VC2C is deployed to the prescribed depth of operation. (Practice measuring the pressure
with the included Accutire MS-4021B digital pressure gauge, as each time you check the pressure,
you release a small amount of air...pressure must be accurate!) WARNING: Disconnect the VC2C
from amplifier if diver is verifying the 0.016 inch piston-stop gap at depth.
11. Tether the VC2C at the test depth determined in step 9, and compensated for in step 10.
12. Connect VC2C to amplifier rated up to 100 watts @ 4 ohms (20 Vrms). Coding: White=Hot,
Black=Return, Green=Ground. WARNING: Connect AC powered amplifier to GFCI outlet only.
13. To help protect the VC2C against burnout, install a 2.5A fast-blow fuse in the white signal wire.
INSTRUCTIONS: LUBELL LABS VC2C UNDERWATER SPEAKER
