Thermocouple Bricklet

Note

The Thermocouple Bricklet is discontinued and is no longer sold. The Thermocouple Bricklet 2.0 is the recommended replacement.

Features

  • Measures temperature with a thermocouple
  • Supports B, E, J, K, N, R, S and T type

Description

The Thermocouple Bricklet can be used to extend the features of Bricks with the capability to measure temperature with a thermocouple. The measured temperature can be read out in °C. With configurable events it is possible to react on changing values without polling.

The supported thermocouple types are B, E, J, K, N, R, S and T. It is also possible to configure custom gains, with which you can read out other thermocouple types or even custom thermocouple types.

Faults such as missing thermocouple and over/under-voltage are automatically detected and reported.

By default the Bricklet comes with a K-type mini thermocouple connector. The connector uses Alumel for the negative Chromel for the positive contact. We can also fit the Bricklet with a matching connector for other thermocouple types. You can choose type J,T,E,U and N. Another option is to choose the wire option. Then you will get the Bricklet without any connector but with two 20cm isolated wires. This way you can connect your own connector to it.

Technical Specifications

Property Value
Sensor MAX31856
Current Consumption 10mW (2mA at 5V)
   
Measurement Range -210°C to +1800°C
Resolution 0.01°C
Accuracy ±0.15% (full-scale), ±0.7°C (cold-junction)
Supported Types B, E, J, K, N, R, S and T (custom types possible)
Connector mini thermocouple jack
   
Dimensions (W x D x H) 40 x 30 x 8mm (1.58 x 1.18 x 0.32")
Weight 8g

Resources

Test your Thermocouple Bricklet

To test a Thermocouple Bricklet you need to have Brick Daemon and Brick Viewer installed. Brick Daemon acts as a proxy between the USB interface of the Bricks and the API bindings. Brick Viewer connects to Brick Daemon. It helps to figure out basic information about the connected Bricks and Bricklets and allows to test them.

Connect the Thermocouple Bricklet to a Brick with a Bricklet Cable as well as a thermocouple to the Thermocouple Bricklet.

If you connect the Brick to the PC over USB, you should see a new tab named "Thermocouple Bricklet" in the Brick Viewer after a moment. Select this tab. If everything went as expected the Brick Viewer should look as depicted below.

Thermocouple Bricklet in Brick Viewer

After this test you can go on with writing your own application. See the Programming Interface section for the API of the Thermocouple Bricklet and examples in different programming languages.

Case

A laser-cut case for the Thermocouple Bricklet is available.

Case for Thermocouple Bricklet

The assembly is easiest if you follow the following steps:

  • Screw spacers to the Bricklet,
  • screw bottom plate to bottom spacers,
  • build up side plates,
  • plug side plates into bottom plate and
  • screw top plate to top spacers.

Below you can see an exploded assembly drawing of the Thermocouple Bricklet case:

Exploded assembly drawing for Thermocouple Bricklet

Hint: There is a protective film on both sides of the plates, you have to remove it before assembly.

Thermocouple types

Different thermocouple types use different types of metals for their wires. Optimally, the connector on the Bricklet uses the same types of metals.

By default the Bricklet comes with a K-type mini thermocouple connector (Alumel for the negative and Chromel for the positive contact). You can connect any type of thermocouple to the Bricklet too, but with a slight increase in error. If you want to use a non-K-type thermocouple and you need the best possible performance we can fit the Bricklet with different connectors for you:

Type Negative Contact Positive Contact
B Platinum/Rhodium Platinum/Rhodium
E Constantan Chromel
J Constantan Iron
K Alumel Chromel
N Nisil Nicrosil
R Platinum Platinum/Rhodium
S Platinum Platinum/Rhodium
T Constantan Copper

Please contact us before you order, if you need a non-K-type connector. Besides K-type we have T and J-type connectors in stock, other connector types have to be ordered first.

Programming Interface

See Programming Interface for a detailed description.

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