thermocouple to 741 opamp

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in proteus if connect ground then ans gettin right but connect to -9V (-Vcc) ans getting wrong....
thats main thing
 

I had a laminator. Its motor got burned. When I opend it. I observed the temperature controller in it. A 741 IC and thermocouple was used. It had a temperature setting knob on front. I can say, 741 can work satisfactorily with thermocouple.
 

741 can work satisfactorily with thermocouple.
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Maximum 741 offset voltage is in a range of 100 °C temperature error. A 741 TC amplifier will at least need offset adjustment. Due to the offset drift, it won't be suitable for accurate temperature measurements. So "satisfactorily" depends.
 

"satisfactorily" depends.
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As cold junction compensation is not use in the application under discussion, an error of 30C-40 C should be expected under different atmospheric conditions. I once made a digital thermometer and control for a four stage compressor. Requirement was to be accurate within 5 degree C from 0-700C. It used TL07 front end and
lm35 for cold junction compensation. it was accurate within 2C.
 

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