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Depending upon the application, a higher temperature may open a contact as bimetal thermometers a heater control or it may close a contact as in a refrigerator or air conditioner.


The electrical contacts may control the power directly as in a household iron or indirectly, switching electrical power through a relay or the supply of natural gas bimetal thermometers fuel oil through an electrically operated valve. In some natural gas heaters the power may be provided with a thermocouple that is heated by a pilot bimetal thermometers a small, continuously burning, flame.

EI Bimetal Thermometer ASME B

In devices without pilot lights for ignition as in most modern bimetal thermometers clothes dryers and some natural gas heaters and decorative fireplaces the power for the contacts is provided by reduced household electrical power that operates a relay controlling bimetal thermometers electronic ignitor, either a resistance heater or an electrically powered spark generating device.

Thermometers[ edit ] A direct indicating dial thermometer such as a patio thermometer or a meat thermometer uses a bimetallic strip wrapped into a coil.


In this diagram, the green metal would be bimetal thermometers to expand faster than the blue metal if the device were being used in an oven. In a refrigeratoryou would use the opposite setup, so that as the temperature rises bimetal thermometers blue metal expands faster than the green metal.

This causes the strip to bend upward, making contact so that current can flow. By adjusting the size of the gap between the strip and the contact, you control bimetal thermometers temperature.

Introduction[ edit ] Bimetallic thermometers are made up of bimetallic strips formed by joining two different bimetal thermometers having different thermal expansion coefficients.

Basically, bimetallic strip is a mechanical element which can sense temperature and transform it into a mechanical displacement.

EI Bimetal Thermometer ASME B

This mechanical action from the bimetallic strip can be used to activate bimetal thermometers switching mechanism for getting electronic output. Also it can be attached to the pointer of a measuring instrument or a position indicator. Various techniques such as riveting, bolting, fastening can be used to bond two layers of diverse metals in bimetal thermometers bimetallic strip.

The tip of the stem is normally bimetal thermometers to flat. It is reset manually.

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