MAX6675 Module + K Type Thermocouple Sensor For Arduino - (AD42235)

Description:

Thermocouples have been around forever and are an excellent way to measure temperature. They have a very long range, are rugged, and come in all kinds of lengths, with variable tip configurations and a variety of sheaths.

The challenge with using thermocouples is the need for what is known as cold junction compensation and the need to detect a very small voltage change for each degree of temperature change.

Fortunately, there are chips like the MAX6675 that make connecting a thermocouple to your Arduino a breeze. The device measures the output of a K thermocouple and provides the result to the Arduino via an SPI interface.

Specs:

As you can see below, the fundamental requirements and capabilities match perfectly with the capabilities of your Arduino microcontroller.

A word of caution: Some people selling this module think the measurement range is -200 to 1300 degrees F. They're wrong. The MAX6675 chip's measurement range is limited to the following:

- Supply voltage 3.3 to 5 VDC

- Operating current over 50mA

- Measuring range 0 to 1024°C (32°F to 1875°F)

- Measurement resolution +/- 0.25°C (+/- 0.45 Deg F)

- Output uses an SPI interface

- SENSOR K thermocouple required

NOTE: It's true that the MAX6675 will read from zero to 1024°C. However, there's another limiting factor. The K thermocouple comes with insulated wires and wire sheathing. These also have temperature limits associated with them. It's not unusual to have a sheathing on your thermocouple that falls below the range of the MAX chip.