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Flow Meter Diagram Symbol Reference: Standard ISA Drawing Icons for System Blueprints
Quick Answer: flow meter symbols on system blueprints follow ISA 5.1 logic. A circle is a field mounted instrument. A circle with a line through it means a control room or DCS function. A square bubble means a shared display or shared control. Check the letter code and tag number before you select a flow meter.
Why Standard ISA Drawing Icons Matter
P&ID drawings use symbols to pack a lot of data into a small space. Engineers read these drawings across oil and gas, water and wastewater, chemical, food and beverage, and marine projects. If the symbols are not standard, the drawing creates expensive mistakes. Most plants follow ISA 5.1 for instrument symbols. A flow meter symbol is not a picture of the physical flow meter. It is a function and location marker.
ISA Letter Codes for Flow Meter Symbols
The first letter F always means flow. The second letter tells you the function. FT means flow transmitter. FE means flow element. FQ means flow totalizer. FI means flow indicator. FIC means flow indicating controller. You may see FT-101 on a drawing. That is flow transmitter loop number 101. A separate FE and FT is common for orifice plate systems. A Coriolis mass flow meter or electromagnetic flow meter often combines the FE and FT into one device.
Location and Shared Display Symbols
A plain circle on a P&ID means the instrument is field mounted. A circle with a line through the center means the instrument signal is available in the control room or DCS. A square around the circle means the function lives in a shared display or shared control. Some drawings use a square with a circle inside for a DCS function. The wire or bus type is not shown by the symbol. That detail appears in the loop diagram or I/O list.
Common Flow Meter Symbols by Technology
Most ISA symbols do not specify the flow meter technology. The tag number and process data tell you more. An electromagnetic flow meter symbol is usually FT with a circle. The line size might be DN25 to DN300. The fluid is often water, wastewater, or another conductive liquid. A Coriolis mass flow meter symbol is also FT or FQ. The tag may include mass flow units such as kg/h. A vortex flow meter symbol often appears on steam or clean gas lines. An oval gear flow meter symbol appears on diesel, oil, or batch chemical lines. A thermal mass flow meter symbol appears on air or biogas lines.
Viscosity, Hazardous Area, and Signal Notes
Here is the thing. The symbol shows the loop function. It does not show viscosity, density, or conductivity. A vortex flow meter on a 100 cP resin line is a poor fit. A Coriolis mass flow meter handles viscosity changes well. An oval ge
Matching the Symbol to the Right Flow Meter
Do not replace a flow meter based only on the symbol. Collect the tag number, pipe size, fluid, pressure, temperature, flow range, signal type, and area classification. A DN15 oval gear flow meter for diesel is different from a DN300 electromagnetic flow meter for seawater. We have seen a water treatment plant in Australia order a vortex flow meter because the drawing symbol looked familiar. The line was wastewater with solids. An electromagnetic flow meter was the better fit. A simple check against the line list avoided a costly return.
How to Send a Drawing to Silver Instruments
Send us your P&ID snippet or system blueprint. Include the flow meter tag number, pipe size (DN), fluid, pressure in bar, temperature in degrees C from PT100 if available, and flow range. Also include the signal type and hazardous area note if present. Our engineers will read the ISA drawing icons and recommend a meter. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
FAQ: Flow Meter Diagram Symbol Reference
What is the ISA standard for flow meter symbols?
ISA 5.1 defines instrument symbols on process drawings. The first letter F means flow. The second letter gives the function such as T for transmitter or E for element.
What does FT mean on a P&ID?
FT means flow transmitter. FT-101 is a flow transmitter with loop number 101. The symbol may be a circle for field mount or a circle with a line for control room access.
What is the difference between FE and FT?
FE means flow element. It is the primary sensor in the pipe. FT means flow transmitter. It converts the sensor signal to 4-20 mA HART or another output. Some flow meters combine FE and FT in one body.
Does the flow meter symbol show the technology type?
No. The symbol shows the function and location. The line list, tag number, process data, and area classification tell you if the flow meter should be electromagnetic, Coriolis, vortex, oval gear, or thermal mass.
What should I send for flow meter selection?
Send the P&ID snippet, tag number, pipe size in DN, fluid, pressure in bar, temperature in degrees C, flow range, and signal type. Silver Instruments will check the symbols and recommend a specific meter.
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