Marine Electronics Forum

EPIRB Water Sensor

Old 04-12-2003, 09:45 AM
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Default EPIRB Water Sensor

I just received my new ACR GlobalFix 406 MHz (Cat II) EPIRB. The documentation contains:

"Two conditions must be satisfied for the GlobalFix™ 406 to automatically activate:
1) It must be out of its bracket,
2) It must be in the water,
Note: Either condition by itself will not automatically activate the beacon."

There is a magnet in the bracket, I surmise that is how the EPIRB knows when it is out of its bracket. (this would also explain all the warnings about not mounting it near magnets)

But how does it know when it’s in the water? I am just curious. There are no visible holes in the EPIRB case that I can find.

And how sensitive is it? Does it need to be immersed? What if it just gets wet? Is that why it won’t activate when it’s in its bracket, to avoid false alarms when it gets (simply) splashed?

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Old 04-12-2003, 11:34 AM
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Default EPIRB Water Sensor

Look on the side of trhe unit for a yellow cylinder set into the corner. That's the sensor that lets the unit know it is immersed. I don;t have my instruction sheet handy, but I believe that the manual switch will override the other switches. This permits use of the unit on deck without need of being in the water. Just splashing will not activate it. It needs to be soaked for a while.
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