Analog Output K-Type Thermocouple Amplifier - AD8495 Breakout

Thermocouples are very sensitive, requiring a good amplifier with a cold-compensation reference. We have a couple of digital thermocouple amplifiers in the shop already from Maxim. Now we're happy to introduce an excellent analog-output amplifier. This is a very simple sensor to use, and if your microcontroller has analogue input capability, you'll be ready to go really fast!

The AD8495 K-type thermocouple amplifier from Analog Devices is so easy to use, that we documented the whole thing on the back of the tiny PCB. Power the board with 3-18VDC and measure the output voltage on the OUT pin. You can easily convert the voltage to temperature with the following equation: Temperature = (Vout - 1.25) / 0.005 V. So for example if the voltage is 1.5VDC, the temperature is (1.5 - 1.25) / 0.005 = 50°C

Each order comes with a 2-pin terminal block (for connecting to the thermocouple), a fully assembled PCB with the AD8495 + TLVH431 1.25V precision voltage reference, and a pin header (to plug into any breadboard or perfboard). Goes great with our 1m K-type thermocouple (NOT included). Not for use with any other kind of thermocouple, K type only!

• Works with any K-type thermocouple
• Uses the AD8495ARMZ part number (A graded chip)
• Will not work with any other kind of thermocouple other than K-type
• Easy to use analogue output
• Temp range with 5V power: -250°C to +750°C output (0 to 5VDC) as long as the thermocouple can handle that range
• Temp range with 3.3V power: -250°C to +410°C output (0 to 3.3VDC) as long as the thermocouple can handle that range

Note: The terminal blocks included with your product may be blue or black.

Revision History

• As of August 27th, 2024 - We added a pre-soldered terminal block.
• As of May 15, 2023 – we've updated this PCB with Adafruit Pinguin to make a lovely and legible silkscreen - you may get the new PCB or the older version with vector fonts - both are identical other than the fancy silkscreen.

Specifications

• Sensing Accuracy Range: ± 1°C around room temperature, ± 2°C for −25°C to +400°C, beyond that range see the AN-1087 app note
• Supply Voltage: 3-18VDC

Resources

• AD8495 Datasheet
• EagleCAD PCB files on GitHub
• Fritzing object in Adafruit Fritzing Library