DAHO (주)다호 트로닉

Principle of Pressure gauge(2)

2. Detection method and operating principle of pressure gauge

2.3 bellows

The measuring part consists of two flanges connected to a flexible cylinder. The pressure applied inside the cylinder is deformed by the total proportional to the pressure. Most of these are used in differential pressure gauges and pressure switches.


2.4 Helicoil tube or pig tails

The coil is cylindrical. It has the same characteristic spiral tube but stronger resistance due to better distribution of force. (Measurement range: about 60… 3000 bar)


2.5 Spiral Tubes

These use the same principle as the “C” tubes but with the end deflection of the extension tube because of the spiral shape. Most are used for gas expansion thermometers.