MAX6675 Module + K Type Thermocouple Thermocouple Sensor

MAX6675 Module Specifications

1. Temperature Range:
   • Operating Range: 0°C to +1024°C (32°F to +1875°F)
   • Accuracy: ±2°C (±4°F) typical, ±5°C (±9°F) maximum
2. Resolution:
   • 0.25°C (0.5°F)
3. Interface:
   • Communication: SPI (Serial Peripheral Interface)
   • Pin Configuration:
     • VCC: Power supply (3.3V to 5V)
     • GND: Ground
     • SCK: Serial Clock input
     • MISO: Master In Slave Out (Data output)
     • CS: Chip Select (Active Low)
4. Power Requirements:
   • Supply Voltage: 3.0V to 5.5V
   • Current Consumption: 50 μA (in active mode); less than 1 μA in sleep mode
5. Thermocouple Compatibility:
   • Compatible with K-type thermocouples (chromel-alumel)
   • Supports cold junction compensation to improve accuracy
6. Features:
   • Built-in Cold Junction Compensation: Automatically compensates for temperature differences at the connection point.
   • Temperature Conversion Time: Approximately 100 ms
   • Data Output: Digital output (SPI) allows easy integration with microcontrollers.
   • Internal Filter: Reduces noise in the readings, ensuring stable output.
   • Thermal Shutdown Protection: Built-in safety features to protect the device.
7. Dimensions:
   • Typical dimensions for the module: 38mm x 24mm (1.5in x 0.9in)
   • Mounting holes for easy installation
8. Environmental Conditions:
   • Operating Temperature: -40°C to +125°C (-40°F to +257°F)
   • Humidity: Non-condensing environments recommended

K-Type Thermocouple Specifications

1. Material Composition:
   • Positive Leg: Chromel (Nickel-Chromium alloy)
   • Negative Leg: Alumel (Nickel-Aluminum alloy)
2. Temperature Range:
   • Standard range: -200°C to +1260°C (-328°F to +2300°F)
   • Extended range with appropriate calibration: up to +1372°C (up to +2500°F)
3. Response Time:
   • Fast response due to small diameter wire (typically 0.5 mm or smaller)
4. Insulation:
   • Commonly insulated with materials like fiberglass, ceramic, or other high-temperature resistant materials.
5. Form Factor:
   • Available in various forms such as exposed junction, grounded junction, and ungrounded junction types.

Applications

• Industrial temperature monitoring
• HVAC systems
• Food processing
• Chemical processing
• Laboratory research

Example Wiring Diagram

• Connect the K-type thermocouple to the MAX6675 module.
• Connect the module to a microcontroller (like Arduino) using SPI communication pins.