Arduino Thermocouple Multiplex

With the new version there are multiple advantages over the old KTA-259, namely, wider temperature range including below 0C, higher accuracy, higher resolution and ability to use more thermocouple types (dependent on model).

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

Note: The v3 and later shields do not ship with Arduino headers, the board accepts both standard headers and R3 headers. Check our Arduino and Arduino Compatible Categories for suitable headers

K-Type Thermocouple Glass can be purchased here: SFS-004

Uses:

• 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.
• Freezer or Cryogenic monitoring  Where temperatures are well below 0C.
• 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 Systems With cheap readily available thermocouples.

Features:

• Add up to 8 Thermocouples to an Arduino
• Cold Junction Compensated Output
• K, J, N, S, T, E or R Type thermocouples supported dependent on model
• 0.1 (2.54mm) Pitch Screw Terminals for Thermocouple connection
• 14-bit 0.25C Resolution
• Nominal ﾱ2C Accuracy
• Based on MAX31855 Cold-Junction Compensated Thermocouple-to-Digital Converter and ADG608 Multiplexer IC
• 13 x 8 Prototyping Area with Analog and Power pins
• Chip Select Pin Jumper Selectable means multi SPI shield compatibility
• Combine with SD card shield for powerful Temperature Logging
• Powered from 3.3V Arduino Pin, 5V compatible

Selection Guide:

Part Number	Thermocouple Type	IC	Measured Temperature Range	Thermocouple Maximum Temperature Range [1]
KTA-259K	K	MAX31855K	-200C to +1350C	-270C to +1372C
KTA-259J	J	MAX31855J	-40C to +750C	-210C to +1200C
KTA-259N	N	MAX31855N	-200C to +1300C	-270C to +1300C
KTA-259S	S	MAX31855S	+50C to +1600C	+50C to +1768C
KTA-259T	T	MAX31855T	-250C to +400C	-270C to +400C
KTA-259E	E	MAX31855E	-40C to +900C	-270C to +1000C
KTA-259R	R	MAX31855R	-50C to +1770C	-50C to +1768C
KTA-259[2]	K	MAX6675	0 to +1024C	-270C to +1372C
KTB-259[2]	K	MAX6674	0 to +128C	-270C to +1372C

[1] This is the range of temperatures that a thermocouple of this type can measure, the Measured Temperature Range is the actual range the KTA-259 can digitise.