At 13.37 2005.05.06 +0100, you wrote:
>>>I am looking into buying a small reflow oven this summer
>>
>>Why don't you DIY?
>>
>>It will "have the best price possible". You will possibily
>>learn many things in the process and will have a lot of fun.
>>
>>I'm making mine with a toaster oven, a PT100 sensor, opamps
>>and of course the magical PIC. Basicly it's a ohmeter (for
>>the PT100 sensor) that controls the heater in a feedback
>>loop to follow the temperature profile ~precisely and actively.
>>
>>I didn't finish it yet (did I start it?) otherwise I would share
>>it. If you can wait a couple of months I'll gladly share my design.
>
>I am at about the same point. Bought a toaster oven off eBay for GBP1.00,
>but haven't fired it up to see what the temp profile will be uncontrolled.
>
>I am looking at the possibility of using thermocouples instead of PT100's,

I gave up on thermocouples because they anyway need a room-temp sensor,
they're susceptible to noise, etc..


>but also have PT1000 sensors in mind as well.

PT1000 was my preferred choice about RTDs, but I couldn't find one with
the right price and leads length so I opted for the more easily available
PT100.

Leads material/length was the biggest problem: you can't solder the leads
if they'll reach 260C.. so you've to get a PT100x sensor with long enough
leads for reaching the outside of the oven chamber.


>One of these days I'll get active on it.
>
>You might want to look at the E-Z_Bake email group on Yahoo groups which was
>set up to discuss such projects. Not very active, but the archives should
>give you a number of pointers.

Thanks.


>
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