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1. Automatic control identification symbol for flow meters
The automatic control identification symbol for flow meters mainly follows national standards and P&ID graphic specifications, with the core identifier being the letter "F" combined with functional suffixes. 1. National Standard Symbol Specification (GB/T 2625-2010) Flow meters start with the letter "F" in the instrument tag number, and use suffix letters to indicate specific functions: • FI: flow indicator (F represents Flow, I represents Indication) • FR: flow recorder (R represents Recording) • FC: flow controller (C represents Control) 2. Flow meter symbol
Flow meters use different identification symbols in different scenarios, mainly divided into two categories: graphic symbols and textual symbols. In engineering drawings or process diagrams, the industry standard for simulating the Hui symbol is usually represented by a circular base graphic for flow meters: an arrow pointing in the direction of fluid flow is added to the center of the circle, and functional codes are marked at the edges of the circle in the design of the Bi Wang section. For example, in industrial production drawings, "FT" represents a flow transmitter and "FRC" represents a flow controller with recording function. This labeling method complies with international standards such as IEC 61512. In physical calculation scenarios, flow is uniformly represented by the letter Q as a symbol. When it comes to specific flow types: volumetric flow is measured in m ³/s (cubic meters per second), while mass flow is measured in kg/s. This representation method is strictly defined by the International System of Units (SI) and is commonly used in scientific research papers and equipment
3. What is the meaning of the "r" symbol in industrial flow meters?
The "R" symbol in industrial flow meters has four common meanings depending on the application scenario.
1. The connection method is identified in the model code of vortex flow meters, and "R" represents the threaded connection method.
. For example, model "1R" refers to a vortex flowmeter with a diameter of 1 inch and threaded connection. In the application of inflow flow meters, R is the flow area factor (also known as the cavity coefficient or pipe coefficient), and the calculation formula for vertical sails is R=Sw/A (the ratio of seepage area to cross section area). This dimensionless parameter is used to correct the effects of fluid viscosity, inertial force, and pipe wall thickness on flow measurement. The accuracy level is indicated in the accuracy annotation, where "R" represents relative error. If marked with "0.2% R", it means that the relative error of the reading of the flowmeter does not exceed 0.2%.4. In the metal tube rotor flowmeter, the "R" series car train code indicates a specific liquid contact material: - R0: 0Cr18Ni2Mo2Ti stainless steel - R1:1Cr18Ni9Ti stainless steel. The specific meaning needs to be confirmed in conjunction with the flowmeter model nameplate, tec
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