2016 Tugs and Cuts its time to replace the CO detector

There is a lot of good information in this thread. I have always replaced Co detectors on an as needed basis. It alarms continuously, No CO present ( airing area out and alarm still chirps ) replace it. I self test yearly which is not near often enough, I actually owned the boat for a year and didn't know it was not installed properly. (My bad, it is a very important piece of safety equipment onboard a boat) When the alarm failed and I realized why. I just ordered a new marine CO detector. The original is not available anymore as discussed in the thread. I was amazed at the cost difference between the ABYC approved and a house unit. This thread has explained some of the differences.


Quote from Sailing Magazine
"There is a difference between the behavior of marine and residential carbon monoxide detectors because the presence of carbon monoxide means different things in either environment. Typically, the carbon monoxide level in a house is very low, and should never get any higher. If the level rises, it means there is a faulty combustion device (stove, furnace, dryer, etc) in the house and the occupants need to be alerted immediately. In a boat, it is acceptable for the carbon monoxide level to spike but only for short periods of time. For instance, if your boat is docked near another boat and it starts its engines, you could theoretically get a bit of carbon monoxide in the boat, even a relatively high level, but only for a short period of time. Marine detectors will note the carbon monoxide level, but will only alarm if the level stays high for a period of time. Marine detectors will typically have several concentration/duration profiles.

If you choose to use a residential unit in your boat you have a high potential of getting false-positive alarms. Additionally, the marine-specific units are better able to handle the harsh marine conditions. The marine units are worth the extra money, and I think it's the way to go in your situation."

Is there a difference between a ABYC approved CO detector and a house hold? Yes, it cost more! Yes, it is designed for marine environment. Are you putting you and your family at risk installing a Non compliant ABYC CO detector in your boat Probably not. I don't know much about these devises to answer the question correctly. So it is my choice to spend the extra $$ for a ABYC approved detector. It is a boat, that's what we do, pour money into it for our enjoyment!

The most important information to gain from this thread/topic is check your CO detector. If it is purchased from a marine store or Homedepot make sure you you selftest often to confirm it is working properly. I will be more proactive at this.
 
I know this is not a new topic and has been discussed extensively, but after a lot of searching, I could not find anything that fit my specific circumstance, and thought I would give it a try. If this has been discussed, I apologize in advance.
Quick summary: 2009 R25 Classic with 150 diesel, electric stove, no furnace, Mase Generator.
Over two years ago, CO Detector was found to be inoperative after a check prompted by this discussion (thank you). Replaced with newer model Xintex Marine 12 V version 26 months ago. It is always powered (inside winter storage), never a problem, and always tests correctly, until trip last month. Went off in alarm mode twice during the night. Nothing running on the boat, engine off for 12 hours, no other boats in the marina running as far as I could tell, and could not hear any generators. There was a parking lot about 100 feet from our boat, but could not hear any cars running. Went back to bed after thorough search with windows open and detector disconnected.
Following the oft cited maxim in this forum "It is probably the last thing you did", I went over everything that might have been changed or added. Only one thing was noted, I had put a new gel foam mattress topper in the forward cabin, and this was the first night it had been unrolled. Although there was no odor, the info with it stated it could off-gas for a couple of days. Has anyone had a similar experience with a gel foam topper?
I reconnected the alarm and removed the mattress topper. After returning, I aired the topper out for a week out of the boat, reinstalled it and just came back from a 3 night stay on the boat with no alarms. Unfortunately, my variables are complicated by the parking lot near the marina.
Has anyone had a similar experience with a false alarm due to a foam topper or other new similar material?
 
There are gremlin gases that could set off the CO detector. It could have been from the mattress. One other gas that can set off a Co detector is hydrogen. If you have lead acid batteries on the boat there is a potential for hydrogen gas to be present. Normally not enough to have LEL (lower explosive limit) levels at a dangerous level but high enough to set the CO detector off. Cross-sensitivity between carbon monoxide detectors and hydrogen gas is well documented. Batteries stored in enclosed compartments should have good ventilation to the outside. This is one area the Ranger and Cutwaters are lacking. There is no true engine and battery compartment ventilation. There are gaps between the cockpit liner and the hull that provide air in and out but this is in the cockpit not outside the hull. There are no sealed bulkheads between the engine machinery compartments and the living quarters in a Ranger or Cutwater. Odors or gases from the battery compartments and engine compartments can migrate to the living quarters. When the engine is running it will normally maintain a lower pressure in the compartments and suck all odors and gases out . When the engine is not running the lack of passive ventilation intake and exhaust can allow gases to linger. Theses gases are not at high danger levels but enough to possibly set off the Co detector. In your case probably the mattress using the theory the last thing we did was??? To be on the safe side inspect the condition of your batteries. If you have AGM or lithium this was probably not the issue. If you have flooded lead acid I would check the condition and for evidence of gassing.
 
A good thought. 1 year old flooded lead acid in all 4 positions. Two start, two deep cycle. All electrolyte levels right on. New charger with voltages right on spec for that type of battery, charging and at rest. I will keep an eye on that also.
Thank you, Brian
 
The CO detector goes off in our boat every time my wife sprays the air freshener! :lol:

Curt
 
That stuff is almost a deadly as nail polish
 
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