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Quick Answer: Electromagnetic flow meters, also called magflow meters, measure conductive liquids with no moving parts. They fit water, wastewater, acids, slurries, and food fluids from DN15 to DN2000. Silver Automation Instruments supplies these meters with 4-20 mA HART, pulse, Modbus RTU, and optional ATEX Zone 1 approvals. Send pipe size, flow range, pressure, temperature, and conductivity for a quote.
Electromagnetic flow meters use the induction principle. The meter creates a magnetic field across the pipe. Conductive liquid moving through the field generates a voltage. Two electrodes measure that voltage and the transmitter converts it into flow rate.
The meter has no moving parts in the flow path. There is no impeller, no gear, no turbine. This design handles dirty water, sludge, and corrosive acids with less maintenance than mechanical meters.
Choose a magflow meter when the liquid conductivity is above 5 µS/cm. Drinking water, river water, seawater, wastewater, beer, milk, sodium hydroxide, and phosphoric acid all work. Produced water from oil and gas separation also works when conductivity is above 5 µS/cm. But a magflow meter will not read diesel, gasoline, vegetable oil, or deionized water. Those fluids need oval gear flow meters or Coriolis mass flow meters.
In practice, the conductivity limit causes more confusion than expected. A water treatment plant in Malaysia asked about measuring reverse osmosis permeate. That fluid has conductivity below 5 µS/cm. The correct choice was a Coriolis mass flow meter, not a magflow meter.
We have seen this on customer sites many times. A magflow meter on a raw water line runs for years with no service. An oval gear meter on a similar line with silt can clog or wear.
Silver Automation Instruments offers electromagnetic flow meters in compact and remote versions. Line sizes start at DN15 and go up to DN2000. Standard accuracy is 0.5 percent of reading for flow velocities above 0.3 m/s. Flow velocity should stay between 1 and 10 m/s for best results.
Liner materials include hard rubber, EPDM, PTFE, and PFA. Electrode materials include 316L stainless steel, Hastelloy C, titanium, and tantalum. Outputs include 4-20 mA HART, pulse, and Modbus RTU. Power options include 220 V AC, 24 V DC, and battery powered models for remote sites.
For a DN100 raw water line, specify hard rubber liner, 316L electrodes, IP67 housing, and 4-20 mA HART. For hot sulfuric acid at 40 percent concentration, specify PTFE liner and Hastelloy C electrodes. For seawater desalination feed lines, specify titanium electrodes and EPDM liner.
Viscosity up to 1000 cP is acceptable as long as conductivity stays above 5 µS/cm. Slurries up to 30 percent solids are common in mining and wastewater service.
A customer in Vietnam ordered a DN150 magflow meter for river water intake. The meter runs at 0.6 bar and 28 °C. The meter sends a 4-20 mA signal to a local PLC. That unit has run for 14 months without service.
A paint manufacturer in Southeast Asia ordered a DN80 magflow meter with PTFE liner and Hastelloy C electrodes for water based paint. The flow rate is 12 cubic meters per hour at 2 bar and 35 °C. The meter has run for 9 months without cleaning.
Magflow meters require a full pipe. Do not install the meter at the highest point of a gravity flow line. Air bubbles cause unstable readings. If air is present, mount the meter in a vertical pipe with upward flow.
Keep 5 diameters of straight pipe upstream and 2 diameters downstream for most installations. If a pump or control valve sits close, increase upstream straight run to 10 diameters.
Here is the thing. Grounding is critical. Use grounding rings or grounding electrodes when the pipeline is plastic or internally lined. For metal pipes, connect the meter ground to the pipe flange. Most engineers skip this part. That mistake causes more startup delays than any other commissioning issue.
Tell us the liquid name, conductivity, pressure (bar), temperature (°C), pipe size (DN), and flow range. Include required output, power supply, and hazardous area certification. A complete request gets a faster price.
Contact Silver Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610. You can also send a message through flow-meter.com.au.
Any conductive liquid above 5 µS/cm. Water, wastewater, seawater, acids, caustic, beer, milk, sludge, and slurries work well. Oil, diesel, and deionized water do not work.
Use 5 diameters upstream and 2 diameters downstream in most installations. Increase to 10 diameters upstream when a pump or control valve is close.
Yes, but accuracy drops below 0.3 m/s. Select a smaller line size or ask for a low-flow calibration. For flows below 0.1 m/s, consider a Coriolis mass flow meter.
Yes. Silver Instruments can supply ATEX Zone 1, Zone 2, and IECEx versions. Specify the gas group and temperature class when requesting a quote.
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Include the liquid name and conductivity. Contact Silver Instruments at Tel: +86-25-68650347, Whatsapp: +86-25-52155837, WeChat: +86 15365082610.
