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What is the automatic control identification symbol for flow meters? The automatic control identification symbol for flow meters mainly includes two types: letter codes and graphic symbols, which need to be distinguished according to the national standard GB/T 2625 and P&ID diagram specifications. 1. Symbol rules in national standard GB/T 2625-2010
(1) Letter combination rules • Variable identification: Flow variables are uniformly represented by the letter "F"; Function code: "FT" represents flow transmitter (such as FT-101), "FY" represents flow calculator, and "FE" refers to flow detection element.
(2) Distinguishing graphic symbols • Installation location symbols for cavity modified silver instruments: On site installed instruments are represented by solid circles, while instruments installed on centralized instrument panels are marked with dashed circles.
. two The symbols in the P&ID diagram represent(1) Mechanical flowmeter graphics - orifice plate, Venturi tube and other throttling devices flow meters, using a graphic symbol with a circle in the middle of two short vertical lines to represent the throttling element, with a letter code next to it.
(2) Electronic flowmeter graphics - Electromagnetic flowmeters, vortex flowmeters, etc. are usually identified by rectangular boxes combined with the letter "F" and functional codes (such as FE, FT), and the symbol form and functional labeling should match the process flow description. After mastering the symbol rules, Brother Jian can quickly identify the type and function of flow meters in the self-control drawings, reducing confusion in design and debugging.
2. In the process flow diagram with control points, the symbol repres
In the process flow diagram with control points (P&ID), the standard symbol for the electromagnetic flowmeter consists of "graphic+letter code" and must comply with specifications such as GB/T 2625-2008.
. 1. The graphic symbols that make up an electromagnetic flowmeter usually include three core parts: • Measuring element: The main body is a circular symbol with a horizontal line in the middle, representing the electrode in the principle of electromagnetic induction; • Connection line: Connect the measuring element to the pipeline system through a straight or broken line, indicating its installation position in the process; • Instrument Circle: Some design units may add a circular or square dashed box around the symbol to indicate the instrument number and parameters; • Cumulative function FT: If it also has flow accumulation function, use "T" (transmitter transmitter) instead, such as FT-102; • Additional identification: letter combinations can be expanded according to requirements, such as FIQ indicating flow indicator with cumulative function3. Practical application example: In a chemical P&ID drawing, the circular symbol next to the pipeline has a horizontal line inside, marked FE-301, representing the electromagnetic flowmeter installed at that location with the number 301. The symbol is connected to the pipeline by a solid line, with both ends of the horizontal line pointing towards the direction of flow of the fluid. If FT-402 is labeled next to the same symbol, it indicates that this is a flowmeter transmission device that supports remote data transmission. 4. Differences in labeling indicate that some design institutes may adjust the angle of the horizontal
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