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11-11-2017, 09:58 PM
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#1
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Guru
City: Stuart FL
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 2,358
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False Smoke Alarm
While traveling on the fly bridge in dense fog a smoke alarm in the saloon below began to blare. It is mounted at ceiling height. I immediately went below and searched the entire boat from the engine room to the fly bridge and could find nothing amiss. There was no smoke odor or any signs of smoldering wires or fire. Engine temps were normal and all belts were normal as well. I had to remove the batteries from the alarm to make it stop.
After the fog cleared I reinstalled the batteries and the alarm stayed quiet. It has not gone off for the last week. Any ideas if the fog could have caused this strange event? 
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Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
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11-11-2017, 10:03 PM
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#2
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Guru
City: Jacksonville
Vessel Name: SONAS
Vessel Model: Grand Alaskan 53
Join Date: May 2014
Posts: 7,327
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Is it a multiple alarm, including CO?
Could it be the station wagon effect which could be exacerbated by the heavy air?
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11-11-2017, 10:04 PM
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#3
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Guru
City: Stuart FL
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 2,358
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It's a smoke alarm only. Not sure about station wagon effect but perhaps.
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Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
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11-11-2017, 10:10 PM
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#4
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Guru
City: Sharon, Ma
Vessel Name: Slow Lane
Vessel Model: 2005 Silverton 35 Motoryacht
Join Date: May 2017
Posts: 1,107
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Sheesh, I'm sure that was unnerving. Especially since you haven't found the culprit. Good luck!
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11-11-2017, 10:15 PM
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#5
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Guru
City: Jacksonville
Vessel Name: SONAS
Vessel Model: Grand Alaskan 53
Join Date: May 2014
Posts: 7,327
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Folks, if you leave your aft doors open when running, then take a walk down into your salon a time or two. The smell with give you an indication as to what is being sucked back into your boat.
Not a big deal while running and there is plenty of air flow.
Just something to understand and be aware of.
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11-11-2017, 11:40 PM
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#6
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Guru
City: Seabrook, Texas
Vessel Name: Small World
Vessel Model: Defever 50
Join Date: Sep 2014
Posts: 611
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I don’t see how fog could have set it off.
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11-12-2017, 01:26 AM
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#7
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Guru
City: Boston Area
Join Date: Feb 2017
Posts: 1,706
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Yes. High humidity can set of smoke detectors.
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11-12-2017, 06:44 AM
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#8
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Guru
City: Ft Pierce
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 22,687
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Agree, high humidity, usually when chilly has set off my detectors. (They are home style, not marine)
A short blast from a hair dryer shuts them right up.
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11-12-2017, 09:37 AM
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#9
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Guru
City: New Orleans
Vessel Name: Panache
Vessel Model: Viking 43 Double Cabin '76
Join Date: Mar 2011
Posts: 1,289
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Photoelectric sensors will alarm when anything that will reflect light enters the the sensor chamber. Particulates (smoke) or water droplets (fog) will do the job.
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11-12-2017, 10:05 AM
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#10
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Guru
City: Stuart FL
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 2,358
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Quote:
Originally Posted by sbu22
Photoelectric sensors will alarm when anything that will reflect light enters the the sensor chamber. Particulates (smoke) or water droplets (fog) will do the job.
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That must be it. It's now 2-weeks and it's still quiet. I'm live aboard so I'm here all the time.
__________________
Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
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11-12-2017, 10:49 AM
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#11
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Guru
City: Seabrook Texas
Vessel Name: TheVenture
Vessel Model: 1985 Bestway Labelle Sundeck 40ft
Join Date: May 2013
Posts: 541
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Smoke detectors come in two varieties: Ionization and photo electric. Ionization looks for polarization of ions caused by oxidation of burning. Photoelectric works on an obscuration principle. Fog obscures so there you are. 
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11-12-2017, 12:59 PM
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#12
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Guru
City: Pender Harbour, BC
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,715
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Plus, if they are ten years or more old they should be trashed.
__________________
Don't believe everything that you think.
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11-12-2017, 02:58 PM
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#13
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Guru
City: Stuart FL
Vessel Name: Magic
Vessel Model: Grand Banks 46 Europa
Join Date: Aug 2013
Posts: 2,358
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Quote:
Originally Posted by Xsbank
Plus, if they are ten years or more old they should be trashed.
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Funny you should say that. It was 11 years old and I replaced it today with an ionization model that has a 10 year Li battery. I sincerely hope I outlive the battery.
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__________________
Howard
Magic, 1996 Grand Banks Europa
Westport, CT and Stuart, FL
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