Kmeter Isolation Unit with Thermocouple Temperature Sensor (MAX31855)

M5StackSKU: U133-V11
Sale price £13.17
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The KMeterISO unit is an integrated K-type thermocouple sensor unit that integrates the functions of acquisition, isolation, and communication. It uses the STM32F030 & MAX31855KASA+T 14-bit thermocouple digital conversion chip scheme, to achieve high-precision temperature acquisition and conversion. The MCU uses the STM32F030 to get data acquisition and the I2C communication interface, using CA-IS3641HW as a signal isolator. The unit supports access to thermocouple probes with a measurement range of -200°C to 1350°C, and adopts a universal standard K-type flat interface, which is convenient for subsequent replacement of different measuring probes to match different needs. This module is widely used in application scenarios such as temperature collection, control, and monitoring in industrial automation, instrumentation, power and electrical, and other fields.


  • STM32F030, high-performance ARM Cortex-M0 core, supports I2C firmware updates
  • MAX31855KASA+T: (14Bit ADC, 0.25°C Resolution, ±2% Accuracy)
  • Supported probe types: Type K - Supports access probe measuring range from -200°C to 1350°C
  • I2C communication interface address: 0x66
  • CA-IS3641HW isolates input and output signals to improve stability, safety, and reliability.
  • Supported programming platforms: Arduino, UIFlow


Resources Parameters
MCU STM32F030, ARM Cortex-M0, 48MHz, 64K flash, 4K SRAM
Temperature sensor chip MAX31855KASA+T
Signal isolation chip CA-IS3641HW
resolution 14 bit
Thermocouple Operating temperature range -200-1350°C
Thermocouple type K
Maximum sample rate 10 Hz
SPI interface clock frequency range Up to 5 MHz
Internal temperature sensor accuracy ±2°C
measurement accuracy ±2°C
Anomaly detection Open, short, and thermocouple low voltages
STM32F030 ARM Cortex-M0, 48MHz, 64K flash, 8K SRAM
i2c address 0x66
Product Size 56 x 24 x 9.6 mm
Package Size 136mm × 92mm × 13mm
Product Weight 10.1g
Package Weight 22g


Package Contents

  • 1x KmeterISO Unit
  • 1x K-type thermocouple probe (measuring range -50°C to 250°C, wire length 1m)
  • 1x HY2.0-4P cable (20cm)

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