How is a Thermometer Made?

Posted by on Wednesday, January 13, 2016

Although there are several types of thermometers out there, we will take a look at how the classic household variety is made.

The first step is acquiring a raw glass material is received from an outside manufacturer in a tube shape.

The bulb reservoir is formed by heating one end of the glass tube, pinching it closed. However an opening is left at the top.

Next a hydrocarbon fluid is added. Once full the tube is placed upon its bulb end. It is then raised to a temperature of 204°C then to room temperature. Next the thermometer is sealed by placing it over a flame.

Next the cale is added. For accuracy purposes, engraving is the preferred method of marking. 

Lastly the thermometers are packaged and shipped to customers.

The Team

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