Datasheet

thermocouples. Most thermocouple thermometers have the offset corrected in software which is what we suggest.

See this guide for tips on calibration:

Sensor Calibration

For precision temperature measurement, we suggest a 1% Thermistor.

How can I connect multiple thermocouples?

You can connect as many MAX31855's as you have pins. Simply share the CLK and DO pins of all the breakouts and

have a unique CS pin for each one

Then you can create new thermocouples using the following style:

Adafruit_MAX31855 thermocouple1(thermoCLK, thermoCS1, thermoDO);

Adafruit_MAX31855 thermocouple2(thermoCLK, thermoCS2, thermoDO);

Adafruit_MAX31855 thermocouple3(thermoCLK, thermoCS3, thermoDO);

You can also try having same CS and CLK pins but all different DO pins

Adafruit_MAX31855 thermocouple1(thermoCLK, thermoCS, thermoDO1);

Adafruit_MAX31855 thermocouple2(thermoCLK, thermoCS, thermoDO2);

Adafruit_MAX31855 thermocouple3(thermoCLK, thermoCS, thermoDO3);

At extremely high or low temperatures, the measurements are not correct

The 31855 chip handles the linear range of the K-type thermocouples very well. It does not provide correction for

the non-linearities that occur at the extremes of the measurement range. Thermocouple linearization for

temperature extremes requires some curve fitting. See this guide for more information and example code:

Thermocouple Linearization