Type K Thermocouple Sensor Amplifier Arduino Shield Circuit Schematic

Autometronicschool. - This is information for you from the article that titled with Type K Thermocouple Sensor Amplifier Arduino Shield Circuit Schematic that published in Electronic-Lab site and written by Rajkumar Sharma.

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This is a Type K Thermocouple Sensor Amplifier Arduino Shield that enables an Arduino board to acquire temperatures from a thermocouple of type K. The shield works with a single supply and takes 5V DC from the Arduino boartd, the output of the circuit is 0 to 4V DC for 0-degree centigrade to 400C. The output of the amplifier is connected to the A0 analog pin of Arduino. A typical application of thermocouples is in boilers, soldering stations, and heaters. 

Also, 3D printers rely on thermocouples to measure the extruder temperature.The K thermocouple has usually two wires, made of Alumel and Chromel that need to be connected with special care: no solder, just use mechanical connection, therefore it is advisable to use special connectors available for thermocouples.

The circuit is built using LTC1049 op-amp and Thermocouple Cold Junction Compensator chip LTC1025. The board also supports other sensors like Type E, J, R, S, and T, however I have tested this circuit with Type K Sensor, jumpers are provided to use, and select other types of sensors.The LTC1049 is a high performance, low power zero-drift operational amplifier. 

The two sample-and-hold capacitors usually required externally by other chopper stabilized amplifiers are integrated on the chip. Further, the LTC1049 offers superior DC and AC performance with a nominal supply current of only 200μA. The LTC1049 has a typical offset voltage of 2μV, drift of 0.02μV/°C, 0.1Hz to 10Hz input noise voltage of 3μVP-P and typical voltage gain of 160dB. The slew rate is 0.8V/μs with a gain bandwidth product of 0.8MHz.

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