thermocouple amplification

hello, i am using t type thermocouples for the measurement. am looking for a instrumentation amplifier for the same. i found ad595 is suit for the this type of thermocouples. but the temperature limit for this one is 0-50 degree celsius. for my application the temperature is 20-100 degree celsius. then i found ad849x for j and k type thermocouples..can i use this for t type?,,also is there any special amplifier for t type for the range of 20-100 degree celsius..

thank you

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    •  Analog Employees 
    on Mar 10, 2014 7:20 AM over 6 years ago

    Hi inayath,

    T-type and K-type thermocouples require very similar cold-junction compensation voltages. For this reason, I recommend that you use either the AD8495 or AD8497, depending on the ambient temperature range that you are operating at. However, since you are using a T-type thermocouple, your output will differ from the 5mV/degC transfer function mentioned in the datasheet. You can compensate for this by using the NIST method that is on page 2 of this application note.

    I hope this helps!

    Kris

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  • 0
    •  Analog Employees 
    on Mar 10, 2014 7:20 AM over 6 years ago

    Hi inayath,

    T-type and K-type thermocouples require very similar cold-junction compensation voltages. For this reason, I recommend that you use either the AD8495 or AD8497, depending on the ambient temperature range that you are operating at. However, since you are using a T-type thermocouple, your output will differ from the 5mV/degC transfer function mentioned in the datasheet. You can compensate for this by using the NIST method that is on page 2 of this application note.

    I hope this helps!

    Kris

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