General Description

The Temperature Test Module, "BS2", has been designed to teach the use and applications of sensors of temperature as a measure, and its control.

We have a half-open space in whose interior there are two lamps that are going to heat that space. Temperatures will be around 40 °C in the lower part and around 80°C in the upper part.

To measure the temperatures there are different type of sensors placed in different positions that are at different distances from the warming source, in order to get higher or lower temperatures.

Among the sensors there are thermostat sensors. The thermostat sensors contain a contact, that is closed at a precise temperature, which can be directly chosen with a numbered dial placed on the thermostat. There is also a switch sensor and thermocouple.

On the other hand, in the external casing there is a "magnetic block" where we have a "Curie effect" temperature control.

Included elements:

  • Bimetallic switch sensor: It is placed at the central part of the module, very close to one of the heater sources, in order to allow the temperature to rise quickly even over the switching temperature.
  • Adjustable bimetallic thermostat: It is placed in the central part of the module at the lowest position, because the temperatures at which it works must be not too high. It is based, just as the one before, on the combination of two different metals, but with the difference that in this one we can chose the cut-off temperature.
  • Relay: That enables to turn on and off in the magnetic block, both the incandescent lamp and the heater resistor that rise the temperature in the magnetic block.
  • Magnetic block: It is in the external part of the module. It has a ferrite with an empty cylindrical form through which goes a resistor that is going to heat it at high temperatures. It also has a gravity switch that closes two sockets.
  • Capillary thermostat: The capillary is placed in the upper part on the left end of the module, near another lamp, since the temperatures reached will be high. The thermostat works with a fluid placed at 90 mm in the capillary tube. The switch temperature is adjustable.
  • Thermocouples.

Exercises and guided practices


  1. How to use the Curie effect as application of a high temperature thermostatic controller.
  2. Adjustable bimetallic thermostat. To use the bimetallic thermostat as a temperature controller, calculating its hysteresis.
  3. Adjustable bimetallic thermostat. How we can reduce the hysteresis by adding a resistor to the heating circuit.
  4. To use the thermostat based on a bimetallic sensor to control the temperature.
  5. To use the capillary thermostat.




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