Thanks for that pointer. I'm in the thinking process of going caravanning, = and such sensors are at the back of my mind. As a side issue to this, but related to the above, I have heard of sensors = for detecting the anaesthetic gasses purported to be used by people who bre= ak into caravans and motor homes. Does anyone know anything about these sen= sors? -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of David = Robertson Sent: 19 August 2019 01:24 To: Microcontroller discussion list - Public. Subject: Re: [EE] flammable gas detector blues On a more practical note, take a look at the Figaro 2610-C/D LP gas sensor= s. These work a little differently to my previous explanation in that there= is a heating element that is not used for sensing, and a thick film sensin= g element made from tin dioxide. The -D version has a membrane filter of so= me kind to apparently increase selectivity by filtering out interfering com= bustible vapours. Power consumption is 280mW, which is manageable for inter= mittent operation on battery power. https://static.rapidonline.com/pdf/50-9095.pdf David -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .