looks like a propane sensor
Does not look like a button from the photos looks like a propane sensor.
Guy
Does not look like a button from the photos looks like a propane sensor.
Guy
ted_reshetiloff
Contributing Partner
Now I 'm curious. If that is a propane sniffer should it not be in the bilge?
Dave Hussey
Member III
...it could be a camera so "the man" can keep an eye on ya... 
Good intuition, but ... the sensor can be ruined by bilge water, especially contaminated water.
The trick is to mount it as low down as reasonably possible, but not where "normal amounts" of water would slosh onto it.
I did a full-Monty LPG system install on our previous boat, and put in a remote shutoff and alarm/sensor panel.
Admittedly, that was a few years ago, and those sensors could be based on a more robust technology today.
Regards,
Loren
Most of them need to be replaced
If you look at the sensor instructions, they are a time sensitive device for most of the units, and require replacement every 2 years or so. I think the radio active element in them decays to the point that they no longer do their job correctly.
If you look at the sensor instructions, they are a time sensitive device for most of the units, and require replacement every 2 years or so. I think the radio active element in them decays to the point that they no longer do their job correctly.
Testing
I picked up (correct?) advice once to occasionally test these units with a butane lighter. Don't torch it just blow a little against it to see if the system trips. On mine it takes quite a bit of butane to kick in...
I heard that 'replace' requirement, too, but I was always thinking that it was some kind of membrane that changed its conductivity when exposed to the gas? Any specialists?
I picked up (correct?) advice once to occasionally test these units with a butane lighter. Don't torch it
just blow a little against it to see if the system trips. On mine it takes quite a bit of butane to kick in... I heard that 'replace' requirement, too, but I was always thinking that it was some kind of membrane that changed its conductivity when exposed to the gas? Any specialists?