Thermal flow controller principle contains two resistors Tianjin flow switch in a closed probe, one of which is heated as the probe resistance, and the other was not heated is called a reference resistor, when the streets of the flow, heat the heating medium is tape go, the resistance value is changed, the difference between the two resistors are used as the basis for judging the flow rate. Withstanding pressure: 0 ~ 100bar (high voltage to be customized); medium temperature: -20 ℃ ~ 80 ℃ (medium temperature ≤4 ℃ / s) Ambient temperature: -20 ℃ ~ 70 ℃; Relative humidity: 5 to 85% in flow switches, magnetic level gauge works according to the principle of constant buoyancy, the float in the measuring tube with the level of lift and move up and down, the permanent magnet inside the float through the coupling, drive red, white turned columns rotated 180 degrees, the column turned from white to red when the level rises, from red to white when you fall, in order to achieve the level indicator. However, float type level gauge works according to the principle of variable buoyancy, float with the level in the tank wall of the lift moves up and down, the spring force on the pull-buoy and proportional to the level, caused by detecting torsion spring force the size of the water flow switch angles to detect high and low level. Many different types of flow switch flow switch, there is a more common thermal diffusion flow switch, which is somewhat different from the general principle, generally based on the thermal diffusion controlled. Thermal diffusion technology is an excellent performance in harsh conditions, high reliability technology, the typical principle is that when two sensing elements are placed in the fluid, one of which is heated and another for sensing process temperature. The temperature difference between the two sensing elements with the original properties of the fluid velocity and the fluid related. The temperature difference between the two sensing element of the thermal diffusion flow switch between no-flow state is reached at the maximum, but also with the increase in traffic, resulting in cooling the heated sensor element, temperature will gradually decrease. This process, the fluid flow rate will directly affect the degree of thermal diffusion. Flow switch manufacturers | Flow Switch | tour travel TU TU offered by Beijing Science and Technology Co., Ltd. Beijing Tour En Technology Co., Ltd. (www.bjyouen.com) (www.bjyouen.com) strong, credible, in Beijing's Haidian District, chemical instrumentation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead tours into the brilliant grace and you work for a better future!