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BL2000, how to read thermocouples

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BL2000, has 9 A/D convertor, but ADC0-3 is for -10.24V to +10.24V, ADC4-8 is for 0V to +49V.
What should I add to converter them read thermocouples? I need to read 6 of thermocouples. Then do PWM control.

Thanks,
Hao
asked May 26 in Rabbit by seraph New to the Community (2 points)

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1 Answer

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Best answer
You need to use what's called a temperature transmitter to convert a thermocouple signal to 0-10V.
answered May 26 by mutantworm New to the Community (42 points)
selected May 26 by seraph
This sounds like the right choice.  You'd need a high-precision ADC to read the thermocouple's mV output.  The BL2000 was designed for measuring larger voltage ranges.
commented May 26 by TomCollins Veteran of the Digi Community (2,303 points)
Thanks for you two.
As a matter of fact, I got the quote for a transmitter, close to $500, and I will need 3 of them, feel not worth it.
May need to find other board which can take thermocouples inputs
commented May 26 by seraph New to the Community (2 points)
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