The principle and structure of the remote reading thermometer
The remote reading thermometer is based on the relationship between saturated vapor pressure and temperature of evaporating liquid in a closed temperature measuring system. When the temperature change is felt by the thermometer, the saturated vapor in the closed system produces corresponding pressure, which causes the curvature change of the elastic element, causes the displacement of the free end of the elastic element, and then changes the displacement into the indication value by the gear amplifier mechanism.
The main structure include:
The bulb, it is a component that directly contacts the measured medium to sense temperature changes. Depending on the working substance and the medium to be tested, it can be made of copper alloy, steel or stainless steel.
The capillary, it is a seamless circular tube cold drawn from copper or steel, which is used to transfer the change of pressure. Its outer diameter is 1.5-5 mm and its inner diameter is 0.15-0.5 mm.The same length, the finer the capillary, the higher the accuracy of the instrument. Capillaries are easily broken and broken, so they must be protected. Metal hoses can be used as protective sleeves for capillaries that do not bend very often.
The Spring tube, it is an elastic element for general pressure gauges.
The remote reading thermometer has the characteristics of small volume of the thermometer, fast response speed, high sensitivity and intuitive reading.
