K type thermocouple interface with MAX31855 chip Adafruit Industries 3245 temperature sensor module
Product Overview
The MAX31855 is a thermocouple interface chip designed to simplify the integration of K-type thermocouples for temperature sensing. Unlike semiconductor sensors, thermocouples are constructed from two welded metal wires, generating a small voltage proportional to temperature. The MAX31855 provides a digital output, eliminating the need for an Analog-to-Digital Converter (ADC) and handling the complexities of thermocouple measurement, such as the small voltage signals, non-linear response, and cold-temperature compensation. This makes it suitable for applications requiring a wide temperature range, including HVAC systems, heaters, boilers, and kilns. The MAX31855 breakout board is compatible with microcontrollers like Arduino and single-board computers running Python or CircuitPython.
Product Attributes
- Brand: Adafruit
- Type: K-type thermocouple interface
- Wire Braiding: Glass overbraiding
- Color Coding (typical): Red (Negative/Alumel), Yellow (Positive/Chromel)
Technical Specifications
| Specification | Details |
|---|---|
| Thermocouple Type | K-type |
| Interface Chip | MAX31855 |
| Wire Gauge | 24 AWG |
| Wire Length | 1 meter (can be cut) |
| Temperature Range (Thermocouple) | -200C to 1350C |
| Temperature Range (Glass Overbraiding) | -100C to 500C / -150F to 900F |
| Output Voltage Range (Thermocouple) | -6mV to +20mV |
| Precision (Thermocouple) | 2C |
| Supply Voltage | 3V - 5V |
| Interface Pins | CLK (Clock), DO (Data Out), CS (Chip Select) |
| Compatibility | Arduino, Python, CircuitPython |
| Grounded Thermocouples | Not supported |
| Noise Reduction (optional) | 0.01uF capacitor across thermocouple leads (for noisy environments) |
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