AD595: N type thermal couple application

Document created by analog-archivist Employee on Feb 23, 2016Last modified by analog-archivist Employee on Feb 23, 2016
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The AD595 is laser trimmed for type K (chromel-alumel) inputs. Can AD595 be
used to measure N type thermal couple? If OK, will the schematic require some
1. the temperature is <1200 degree;
2. Ambient Temperature. 25 degree;
3. +-1 degree accuracy;
4. Customer will do the calibration.


Since they are doing calibration, they probably already multiply the reading by
a gain and offset in the digital domain.  They can do the same thing with the
AD595 and N type thermocouple, but the gain they use will change with the
temperature reading.  Attached is a table of the output voltage of the AD595
when it is connected to an N type thermocouple.  This table can be used to
convert the AD595 voltage to the correct temperature in the digital domain.