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From: Arild Jensen (no email)
Date: Thu Jul 03 2003 - 14:11:36 EDT
Jim Fidler wrote:
It is good for alarms to sound unique.
I've about run out of alarm sounds --- buzzers (engines), gongs (bilge
pumps), sirens ( high bilge water), beepers, etc., and "I'm still adding on."
And
that doesn't include the alarms in the depth sounder, gps, CO detectors, and
several other systems. It gets confusing.
REPLY
Which is why industrial grade enunciators have a single loud alarm and
multiple visual indicators like Rich Gano's design has.
For large shipboard installations you can have several dozen alarm lights and
one siren or buzzer.
In noisy environments they also use strobes to attract attention.
A latching relay is used to silence the audible alarm - cuts annoyance factor
but the light remains lit until the fault condition goes away.
I recall seeing an aircraft alarm enunciator that really saved panel space. A
dozen lamps and associated labels were back projected an alarm message onto a
single 1" X 1.5" window. Pressing the illuminated screen frame cancelled the
audible alarm but not the visual indicator.
The alarm indication would remain until you cleared the actual fault.
In the case of multiple alarms, the various images would scroll in sequence.
But that is a bit too sophisticated for our kinds of boats.
Cheers
Arild
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