Hi, I'm trying to design a renewable energy heating/hot water system, Arduino controlled.The immersion temperature sensors required for thermal stores all seem to be PT1000 type, and I'm a little confused by what I have read on the subject so far - lots of talk of opamps, 4-20ma converters, lookup tables and lots of ways to wire them up.I am armed with an Arduino, data logging shield, various components and a PT1000 sensor to play with. I have managed to cobble together various sketches to get things going, but I could really do with a nice simple place to start with the PT1000s - any suggestions?Many thanks
Sorry, I didn't describe it well - they are not actually immersed themselves, but slide into a close fitting immersion sleeve, like thishttp://www.alternativeenergystore.co.uk/item/item/102201/1/0/100mm-Stainless-Steel-Immersion-Sleeve.htmwhich are screwed into fittings in the water tank and the solar collector.Thanks for the advice on the resistor, I'll certainly try that and report back when it's all together.
Thanks Lefty - is some kind of thermal grease used to ensure good readings? I was toying with the idea of using a sensor easier (to me at least) to hook up rather than a PT1000, and packing it in with something, as a plan B really if else fails.
A lot of the issues regarding signal conditioning RTDs go away with PT1000s because of the higher resistance.