My thoughts entirely - as it is food you get involved with all sorts of reg= ulations ensuring your instrument is 'food safe' if it can come in contact = with the product. I would look at using a PRT stuck to the outside of the bowl, you could eve= n have a bunch of them around the outside with a single micro monitoring th= em. It is not as though you are measuring to high accuracy. If you can get = within 2C you are probably fine. If you are trying to do fractional degrees= then I suspect you have other problems. -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of= Clint Jay Sent: 22 March 2018 23:35 To: Microcontroller discussion list - Public. Subject: Re: [EE]: Temperature sensing - wireless, short range It seems a very silly idea to risk having electronics drop into the food co= ntent, especially if it's 200C, can you not sense the temperature with some= non contact means or perhaps attach a sensor to the outside of the vessel = and compensate accordingly ? On Thu, 22 Mar 2018 11:13 pm K S, wrote: > Hello list. > > I'm a long time lurker (~18 years?), usually have nothing to add above=20 > the excellent content here. > > I need to monitor the temperature of the liquid in a cooking vessel=20 > which contains a rotating paddle/scraper that precludes me from simply=20 > inserting a fixed probe. My first thought is to have a battery powered=20 > temperature transmitter attached to the paddle - this would also=20 > provide a reading that is averaged through the entire bowl as it moves=20 > through potential hot/cold spots in the liquid. The sensor/probe=20 > itself could be mounted on the paddle such that it is submersed in the=20 > liquid while the electronics could be strapped to the paddle shaft=20 > that remains above the fill line, with a short heat-proof cable in=20 > between. There will be steam and heat and oil splutter there but I'm=20 > sure some protective measure could be employed to house the=20 > electronics. The height of the liquid may be up to around 40cm, and get u= p to 200degC. > > A receiver could then display this temperature and eventually use it=20 > as part of a control process. > > Has anyone done something like this? Or any advice to offer? An=20 > off-shelf solution would be preferred but I'm not finding much. (Lots=20 > of wireless sensors but either for ambient temps, or without rugged=20 > transmitters). I'm thinking maybe build a small battery powered board=20 > with a 433MHz tx module and a suitable receiver but am hoping for=20 > something perhaps quicker to get up and running. > > TIA. > > Kris. > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive=20 > View/change your membership options at=20 > http://mailman.mit.edu/mailman/listinfo/piclist > -- 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 .