What is a Gas Filled Dial Thermometer?

Essentially, the gas-filled dial thermometer is a measuring principle based on the volumetric temperature expansion of the gas filling in the measuring element. The measuring element is tightly connected by a capillary tube containing a measuring spring. The spring transfers the expansion of the gas filling through the movement on the dial. Gas-filled dial thermometers are used for temperatures ranging from -80°C to +600°C. The accuracy is ± 1% of full scale deflection. A gas-filled dial thermometer can be supplied with a capillary line between the measuring element and a 100 m long spring.