Desert Star Acoustic Release Control System, Manual

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If your deployment site has a very low underwater noise, adjusting the “Threshold Level” slider to a minimum setting (all the
way to the left) will increase the operating range of your STM surface station.
This concludes the sonar noise level survey of your deployment site and STM unit tuning.
10. Deployment of the ARC Unit(s)
Before you are ready to submerge the column of equipment into the water and deploy your payload
with the ARC unit(s) to the sea-floor, you must verify if the payload together with the flotation device
do not create excessive amount of force to “overload” the release mechanism causing it to trigger
erroneous release.
In order to choose an optimal configuration of the flotation device sufficient to bring the payload of
particular weight to the surface, while not exceeding the maximum force the ARC unit able to “hold”
under the water, consider the following recommendations:
The recommended flotation type of device to be used with ARC unit and attached payload is a trawl
or hard float. We recommend to use floats similar to a “Trawl Works” float Model #411.
The flotation device must be rated for a depth
​
exceeding the deployment depth
​
by significant
safety margin. The maximum depth of the ARC unit is a 300 meters and the flotation device should
have rating of at least 500 meters.
It is recommended to use a flotation device rated at about 15 lbs of buoyancy, plus buoyancy
equaling the weight of your payload in water. For example, if your payload weighs 10 lbs
submerged, use 25 lbs of flotation.
The ARC submergible unit designed to operate with the working load not to exceed 40 lbs or 18
Kilograms. The working load is measured IN WATER.
In order to the evaluate the working load underwater, follow these steps:
10.1 Workload Evaluation
STEP 1:
Depending on the physical dimensions of your payload, use an appropriately sized body of water.
This can be a bucket, small pool, a bathtub or the ocean.
STEP 2: