Commonly used resistance materials for orifice flow meter and their main properties

Abstract: The commonly used resistance materials and their main performance information for orifice flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Commonly used resistance materials and their main performance orifice flowmeters The resistance materials widely used in electrical instruments are copper-manganese-based alloys and nickel-chromium-based alloys. Copper-manganese-based alloys include manganese copper (including silicon-manganese-copper and germanium-manganese-copper). Constantan, etc. Nickel-chromium-based alloys include Karma (nickel. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the article details of commonly used resistance materials and their main properties for orifice flowmeters. Commonly used resistance materials and Its main performance orifice flowmeter is currently widely used in electrical instrumentation resistance materials are copper-manganese-based alloys and nickel-chromium-based alloys. Nickel-chromium-based alloys include Karma (nickel-chromium-aluminum-iron) and Evan (nickel-chromium-aluminum-copper). Due to the different properties of these resistor materials, they should be selected according to the specific requirements of the resistor when manufacturing resistors. The main parameters of commonly used resistance materials are as follows: 1. The resistivity of copper-manganese-based alloys is about 0.4^-0.5X10-6 ohms·meters, while the resistivity of nickel-chromium-based alloys is 1.31.5X10-6 ohms·The latter is about three times as large as the former. Generally speaking, resistance materials with high resistivity are suitable for making resistors with higher resistance values, while resistance materials with low resistivity are suitable for making resistors with low resistance values. Sometimes in order to To improve the heat dissipation conditions of the resistor, it is necessary to increase its surface area, and a resistor material with a higher resistivity can be selected to manufacture a resistor with a lower resistance value. After the resistance material is determined, different wire diameters or different thicknesses should also be selected according to the resistance of different specifications. In order to facilitate the calculation, the manufacturer of the resistance material usually provides the user with a wire table. This wire table lists the wire diameter specifications of the wire, as well as the resistance value corresponding to each meter length and the wire length per kilogram. 2. Resistance temperature coefficient The resistance value of resistance material changes with temperature. The orifice flowmeter calls this functional relationship the resistance temperature coefficient. The resistance temperature coefficient of most multi-element resistance alloys can be shown in Figure 5--13. The curve shown is shown. In the temperature range of 0~70℃, the temperature coefficient of resistance of the copper-manganese-based alloy is basically approximate to a parabola (curve 1 in Figure 5-13), and the temperature corresponding to the peak point of the parabola is at Between 20 and 50 °C. The relationship between its resistance value and temperature can be accurately expressed by the following formula: 3. Time stability The resistance material used in the precision resistor should have good time stability, that is, its resistance value should not be There are large changes over time. The time stability of the resistance material is a prerequisite for determining the time stability of the dense resistance. 4. The thermoelectric orifice flowmeter for copper is because in the manufacture and use of precision resistors, the resistance material is always connected with other parts (such as lead wires, terminals, etc.), and most of these parts are made of copper In order to avoid the thermoelectric potential caused by the temperature gradient between different materials, the orifice flowmeter concluded that the resistance material used to manufacture the precision resistance is mainly the resistance used under direct current) The thermoelectric potential of copper cannot be If it is too large, the thermoelectric potential of manganese copper, Karma and Evan to copper at room temperature can all be less than 1 microvolt/℃, while that of constantan is as high as 40 microvolts/℃ or more. The resistivity, temperature coefficient of resistance, time stability and thermoelectric potential to copper of the resistance material are directly related to the composition and content of the material. The resistance material used for precision resistance should take into account the main properties. Tables 5-9 are manganese-copper , Constantan, Karma and Evan resistance materials such as the main performance comparison table. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Orifice flow meter commonly used resistance materials and their main properties'

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