Capillary tube

In analog capillary thermometers, capillary tubes are the connection between the measuring point and the scale. These thin tubes play a crucial role in reliably transmitting temperature changes.

Functions of capillary tubes

• Transport medium: Capillary tubes connect the measuring sensor to the dial. They transmit temperature changes through a medium (such as liquid or gas) that expands or contracts with temperature fluctuations.
• Construction: A capillary tube is thin and flexible, often made of metal (commonly stainless steel) or plastic. For additional protection, it can be equipped with a casing that shields it from external influences.
• Flexibility: Capillary tubes allow the measuring point and the scale to be placed in different locations. This is ideal for measurements in hard-to-reach or hazardous areas.
• Precision: Capillary tubes ensure that temperature changes are transmitted accurately and without delay to the dial.

Features and options

Capillary tubes are typically made of metal or plastic, offering high durability and resistance to wear. They are available in various lengths, making them suitable for a wide range of applications. For added protection, you can choose a casing, such as a stainless steel protective sleeve. We are happy to advise you on the options to perfectly tailor your thermometer to your system.

The difference between capillary tubes and stems

In a capillary thermometer, capillary tubes and stems work together to ensure accurate measurements and user-friendly displays. The capillary tube is a flexible connection that transmits temperature changes from the measuring sensor to the dial. The stem is a rigid component that either protects the capillary tube or functions as a sensor itself.