Airmar Acoustic Deterrent System—dB Plus II™ - Manual (Page 8)

6
Shutdown Mode
Whenever the battery voltage drops below 20VDC, the transmitter will automatically switch to the
shutdown mode. The red light on the front panel will flash to signal that the transmitter is off and that the
battery voltage is below the level needed to power the transmitter (see Figure 5). When in the
shutdown
mode, recharge the batteries as soon as possible to minimize exposure to marine mammal attacks.
Caution: The importance of properly maintaining and charging the batteries cannot be stressed enough.
The
dB Plus II
 system will not operate as designed unless the power supply is adequate. It is highly
recommended that you develop a program of daily battery monitoring and maintenance.
Fuse Protection
The dB Plus II
 transmitter is protected by a 8 amp AG fuse. If the power cable leads are mistakenly
reversed or the transmitter is inoperative, check for a blown fuse. The fuse is located in a drip-proof holder
on the bottom panel of the transmitter (see Figure 4).
Maintenance
Batteries
The condition of the batteries must be monitored daily. The voltage level should not drop below
24VDC and electrolyte levels must be maintained in accordance with the manufacturer’s instructions. Keep
battery terminal connections tight and free of corrosion.
Projectors
To maintain the projectors, they must be removed from the water every month and inspected for marine
growth, chaffing of the cable and wear of the support line. Any growth on the projector’s acoustic window
will block the sound generated severely reducing its effectiveness (see Figure 6).
Caution: Always switch the transmitter to “OFF” before removing a projector from the water. The projector
is designed to transmit in water only; transmitting in air may cause damage.
To clean a projector, gently scrape growth from its surface using a stiff brush or putty knife. Remove any
remaining growth with a “scotch pad” and water. Never use solvents. Strong solvents, such as acetone,
attack many polymers and dramatically reduce their strength leading to internal leaks and projector failure.
Clean with a soft cloth and mild household detergent.
acoustic window
Figure 6. Projector