LPG Detector Alarm

[Leonidas]

I am about to fit a new propane gas alarm . However, searching the web I have yet to find any detector which is suitable for LPG that does not require either a 12V or mains supply. I have seen some gas alarms which will run on 2 x 1.5 V lithium batteries , but they are only suitable for natural gas and not propane.
Any experience with the NASA detector? or the Reichelt Electronik GMcc 3000 ???
Thanks for any advice

 

[jdc]

https://www.jegs.co.uk/products/ele...lpg-gas-alarm-with-replaceable-batteries.html

 

[VicS]

https://www.jegs.co.uk/products/ele...lpg-gas-alarm-with-replaceable-batteries.html

Perhaps a disadvantage is the fact that it does not have a separate sensor which can be located at a low level or where gas might accumulate.

 

[PaulRainbow]

https://www.jegs.co.uk/products/ele...lpg-gas-alarm-with-replaceable-batteries.html

That is not suitable for a boat.

Neither is the Reichelt one the OP mentioned.

Remember, LPG is heavier than air, so the detector needs a probe in the bilge. The NASA one has such a probe.

 

[pvb]

https://www.jegs.co.uk/products/ele...lpg-gas-alarm-with-replaceable-batteries.html

That item isn't listed on the FireAngel website. Maybe discontinued? Why?

 

[jdc]

That item isn't listed on the FireAngel website. Maybe discontinued? Why?

Now that is interesting! Lods of them still available, from Amazon or eBay for instance, but it could be that it's no longer made. Personally I'm none too sure that the mounting position is that critical as significant diffusion should occur and I keep my sensor low down anyway (after all the alarm sound travels fine!)

PS: Gravity seperation of LPG. I think ths may be urban myth: we are told how 'heavy' LPG is compared to air. Propane is C3H8, so 3 * 12 + 1 x 8 = 44. CO2 is 1 x 12 + 2 x 16 = 44. Oxygen is O2, 2 * 16 = 32. These are small differences: we don't fear to go downstairs in the morning in case our CO2 has asphyxiated the dog, in fact we know that CO2 spreads throughout the atmosphere, to many thousands of meters. Discuss....

 

[macd]

PS: Gravity seperation of LPG. I think ths may be urban myth: we are told how 'heavy' LPG is compared to air. Propane is C3H8, so 3 * 12 + 1 x 8 = 44. CO2 is 1 x 12 + 2 x 16 = 44. Oxygen is O2, 2 * 16 = 32. These are small differences: we don't fear to go downstairs in the morning in case our CO2 has asphyxiated the dog, in fact we know that CO2 spreads throughout the atmosphere, to many thousands of meters. Discuss....

...but there's a lot more than mere diffusion going on in the atmosphere. And, often in different ways, inside a boat.
Butane, if I'm not mistaken, = 58, to add to the discussion.
You presumably think baling out butane/propane is a waste of time? Except perhaps with a tab on, in which case it's a waste of only very little time
(Not disagreeing, jdc - I'm by no means competent to do so - but why not add to the discussion a little?)

 

[jdc]

I'm not an expert on this either - I'm a mathematical modeller by trade - but I'm by nature dissatified by oft-repeated assertions without reference to emprirical meaurements or references to scientific literature. Loads of sources which we should be able to trust, such as the HSE, do indeed say that Propane pools in low-lying places, but noting that it's the same density as CO2 more or less and this does not seem to accumulate in the bilge has made me wonder. Remember the words of the great Bertrand Russel: "The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widely spread belief is more likely to be foolish than sensible."

 

[macd]

Remember the words of the great Bertrand Russel:...in view of the silliness of the majority of mankind, a widely spread belief is more likely to be foolish than sensible."

Bright chap to work that out even before the invention of The Lounge.