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Electromagnetic Flow Meter Symbol in P&ID Drawings: Engineering Standards
Quick Answer: An electromagnetic flow meter on a P&ID drawing is typically a circle on the process line with the letters FE, FT, or FIT inside. The tag number below the bubble and the dashed signal line to the control system complete the symbol. Silver Automation Instruments supplies electromagnetic flow meters that match ISA 5.1 and ISO 14617 symbol conventions.
What Does an Electromagnetic Flow Meter Look Like on a P&ID
On most P&ID drawings the electromagnetic flow meter appears as a circle in the process line. Inside that circle you will see the tag letters FE for flow element, FT for flow transmitter, or FIT for flow indicator transmitter. Some projects place the letter M inside the circle to show the magnetic measuring principle. A dashed or solid line runs from the circle to the control room or DCS. This line represents the electrical signal.
Tag numbers below the bubble follow the plant naming convention. For example, you may see FIT-2201 on a raw water line in a desalination plant. The loop number tells the technician which loop drawing to check. P&ID symbols do not show full wiring or grounding details. Those live in the loop sheet and the instrument datasheet.
Engineering Standards That Define the Symbol
ISA 5.1-2009 (R 2019) is the main standard used in Southeast Asia, Australia, the Middle East, and parts of Latin America. It defines the circle bubble and the letter tags for flow elements and transmitters. The standard does not force every magnetic flow meter to use the same exact mark. It allows the M inside the bubble or the letters FE and FT. ISO 14617 and ISO 3511 are common in Europe and some African projects. They use a similar circle with function codes. In practice, most engineering contractors keep the same visual logic: a bubble, a tag, and a signal line.
We have seen this on customer sites many times. A water utility in Brisbane used FE and FT tags for a DN500 electromagnetic flow meter on a treated water line. A chemical plant in Vietnam used FIT tags on a DN80 PFA lined meter for acid dosing. The symbols were almost identical. Only the tag numbers and loop sheets changed.
Symbol vs Real Installation
Most engineers skip this part during first review. The P&ID symbol does not show the required straight pipe lengths. Electromagnetic flow meters need 5D upstream and 2D downstream straight runs for many accuracy classes. Some compact models can handle less. But the P&ID cannot show this physical requirement. You have to check the instrument datasheet and the installation detail drawing.
Grounding rings, empty pipe detection, and liner material are also absent from the symbol. A P&ID may only show a simple circle and tag. That is normal. Do not use the P&ID as a wiring diagram.
Common Parameters We Ask Before Quoting
When you send us a P&ID fragment or a tag list, we ask for the following data. Pipe size from DN15 up to DN3000. Fluid type and conductivity, normally 5 µS/cm or higher for standard electromagnetic flow mete
Send us these values by email or WhatsApp. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. We will match the correct Silver Instruments model and send a quotation with the right tag number for your P&ID.
Typical Applications and Tag Examples
In a seawater desalination plant, the brine line meter is often tagged FE-320 or FT-320. The fluid conductivity is high so a standard electromagnetic flow meter works well. Pipe material may be super duplex or lined carbon steel. The P&ID symbol will sit on the brine discharge line with a signal to the DCS.
In food and beverage plants, a CIP return line may use a sanitary electromagnetic flow meter. The tag may be FIT-110 on a DN50 pipe. The liner is PFA and the process temperature can reach 130 °C during cleaning. The symbol is still a circle with FIT inside, but the datasheet carries the sanitary connection details.
In oil and gas produced water service, a DN100 electromagnetic flow meter with ATEX Zone 1 approval may be tagged FT-445. The symbol stays the same. The hazardous area certificate is held in the loop package.
For a standard water line from DN15 to DN300, the Silver Instruments SIF-100E compact electromagnetic flow meter matches most P&ID tags. For corrosive acid or high temperature, the SIF-200E with PTFE liner and tantalum electrodes works better. Tell us the tag number and loop sheet and we will check the signal type.
FAQ
What is the ISA 5.1 symbol for an electromagnetic flow meter
A circle on the pipe with FE or FT inside is the common ISA 5.1 representation. Some drawings add an M for the magnetic principle. A dashed line shows the signal to the control system.
Does the P&ID symbol show the flow direction
Yes, the arrow on the process line shows the flow direction. The circle does not change. The same symbol works for forward and reverse flow if the transmitter is set for bidirectional measurement.
Can one symbol cover a remote transmitter and a compact meter
Yes. A compact meter and a remote transmitter often share the same P&ID circle. The tag letter T may be separated if the transmitter is in a remote housing. Check the instrument datasheet for the exact model.
What if the P&ID uses a square instead of a circle
Some DIN or vendor specific drawings use a square for the transmitter function. The square usually carries the same FT or FIT letters. Ask the engineering contractor which standard governs the drawing set.
Do you need the P&ID to quote an electromagnetic flow meter
No. You can send only the pipe size, fluid, temperature, pressure, and output signal. But if you have the P&ID, our engineers can check the tag and loop number to avoid conflicts. Send it to WhatsApp +86-25-52155837 or Tel +86-25-68650347.
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