Figure 2. ST-400A — Battery Life Estimates “Double Burst Flash”
6
ST-400A
12
9
6
3
2.0
2.5
3.0
3.5
4.0
Range in Nautical Miles
Battery Life
(Days)
(ON at night
OFF during
daylight)
For single
burst
setting,
increase
battery life
by approx.
30%
MAINTENANCE
There are no user repairable parts in the ST-400A, return to the factory for
repairs.
REGULAR MAINTENANCE
•
Rinse thoroughly with fresh water after every use
•
Always remove batteries when not in use
•
Always use fresh batteries
•
Protect “O” ring surface from damage
•
Replace worn or damaged “O” rings
•
Keep batteries and electronics dry
“O” RING FACTS
“O” rings don’t last forever; two to five years is a conservative estimate.
The main problem with “O” rings is that over time they can take a “set”.
They lose their original round shape and they become slightly flattened
resulting in less squish. Reduced squish can lead to a water leak near the
surface. The best way to prevent a problem is to service the “O” rings
before every deployment.
Some of the main factors that can cause a “set” are:
•
High storage temperature (exceeding 40ºC) over time will cause the rubber
to harden
•
Exposure to sunlight and ozone will cause the “O” ring to deteriorate and
stiffen
•
Temperature does not have to be that cold for an “O” ring to lose a great
deal of its flexibility. At 4ºC, an “O” ring has stiffened significantly.
•
“O” rings must be lightly lubricated with silicone- based grease. We rec-
ommend “Parker Super O Lube”
•
A typical seal failure results in a very small amount of water, not a flooded
case. Most seal failures occur near the surface
•
The “O” ring becomes less flexible as the rubber ages
•
If you are operating or storing at low temperature, it makes it even more im-
portant to service the “O” ring regularly
7
ST-400A
