Arduino K, J or T Type Thermocouples Multiplexer Shield

Arduino K, J or T Type Thermocouples Multiplexer Shield

SKU: KTA-259

This shield allows you to connect 8 Thermocouples to your Arduino

Ocean Controls
  • Manufacturer: Ocean Controls
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The KTA-259 Thermocouple Multiplexer Shield is designed to easily allow multiple high temperature readings with an Arduino control board.

Screw terminals are provided for thermocouple connections as thermocouple wires can not be soldered.

Note: The board ships as pictured, without Arduino headers. You can use standard break-away headers, or the stackable headers. The board accepts both standard headers and R3 headers.


  • Automotive: Engine, Exhaust and Brake temperatures are higher than most temperature sensors can handle but within the range of Thermocouples.
  • Ovens, Furnaces and Kilns: At temperatures where other temperature sensors will not operate.
  • Chemical Processes: Where corrosive chemicals may damage probes or reach high temperatures thermocouples are more readily available for such processes.
  • Multi-Zone Temperature Monitoring, Data Acquisition or Logging System with cheap readily available thermocouples.

Ocean Controls SKU / Part NumberThermocouple TypeICMAX31855 Temperature RangeThermocouple Maximum Temperature Range[1]
KTA-259KKMAX31855K-200 to 1350 °C-270 to 1372 °C
KTA-259JJMAX31855J-40 to 750 °C-210 to 1200 °C
KTA-259TTMAX31855T-250 to 400 °C-270 to 400 °C
  • Power Supply: Powered from 3.3V Arduino Pin, 5V compatible
  • Power Consumption: <1.5mA at 3.3V
  • Output: Cold Junction Compensated Output
  • Based on MAX31855 Cold-Junction Compensated Thermocouple-to-Digital Converter and ADG608 Multiplexer IC
  • Add up to 8 Thermocouples to an Arduino
  • Nominal ±2°C accuracy[2]
  • 14-bit 0.25°C Resolution
  • 13 x 8 Prototyping Area with Analog and Power pins
  • K, J, or T Type Thermocouples supported dependent on model
  • 0.1” (2.54mm) Pitch Screw Terminals for Thermocouple connection
  • Chip Select Pin Jumper Selectable means multi SPI shield compatibility
  • Combine with SD card shield for powerful Temperature Logging
  • Dimensions: 60L x 52W x 10H (mm)

Selection Guide:

  • Note 1: This is the range of temperatures that a thermocouple of this type can measure, the Measured Temperature Range is the actual range the MAX31855 can digitise.
  • Note 2: The MAX31855 datasheet specifies ±2 °C for all thermocouple types within the range -20 to 85 °C, not including thermocouple non-linearity or CJC temperature measurement uncertainty. This also doesn't include the effect of the MUX or the KTA-259 board layout.
  • Note 3: The MAX31855 will not work properly with grounded thermocouples. The thermocouple is deliberately connected to the sheath to improve the response time.

See the FAQ or Manual for more on the accuracy and range limitations of the shield

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

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