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In the process flow diagram with control points, the symbol representing the electromagnetic flowmeter is
. 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 function
3. 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 indica
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2. Commonly used instrument characters and graphic symbols
Commonly used instrument characters and graphic symbols
1. Variable symbols Commonly used variable symbols are used to represent the physical quantities or states measured by the instrument, such as flow rate, pressure, temperature, etc. Here are some common variable symbols and their meanings: F: Flow, P: Pressure, T: Temperature, L: Level, I: Current, V: Voltage, Q: Quantity, Accumulation, S: Speed, Switch (image display: variable symbol, corresponding image link has been converted to markdown format). Here are some common functional symbols and their meanings: I: Indication R: Recording A: Alarm C: Control T: Transmitter E: Detection S: Switch V: Valve (image display: functional symbol, corresponding image link has been converted to markdown format)
III. Common graphic instrument symbols Graphic instrument symbols are used to visually represent the type and appearance of instruments, such as pressure gauges, flow meters, thermometers, etc. Here are some common graphical instrument symbols and their meanings: Circular with pointer instrument: usually represents a pressure gauge or similar instrument. Wave line graphic: represents a flow meter or similar instrument. Thermometer graphic: represents a thermometer or similar instrument. Rectangular graduated graphic: represents an electrical signal indicato