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Inline Electromagnetic Flow Meter: Obstructionless Volumetric Sizing for High Conductivity Industrial Fluids
Quick Answer
An inline electromagnetic flow meter measures volumetric flow with no moving parts and no obstruction in the pipe. For high conductivity fluids above 20 µS/cm, a flanged or wafer magmeter gives repeatable readings from 0.5 m/s to 10 m/s. Send your flow range in m3/h, pipe size in DN, pressure in bar, and temperature in °C to Silver Instruments for a model match.
What Inline Electromagnetic Flow Meters Remove From the Flow Path
Inline electromagnetic flow meters have a straight bore. There is no orifice plate, no turbine rotor, no gear, and no bluff body. The sensor sits between two process connections, usually flanged or wafer style. A paint manufacturer in Vietnam replaced a positive displacement meter with a DN50 inline magmeter after pigment paste kept blocking the gears. The meter measured 4.2 m3/h to 18.6 m3/h with no pressure drop beyond the pipe run.
This matters in plants that move lime slurry, filter aid, latex, or fatty waste. A mechanical meter needs clearances. A magmeter does not. The only requirement is that the fluid has enough conductivity.
Volumetric Sizing Without Obstruction
Sizing starts with actual flow range, not just pipe diameter. For a DN100 line, an inline electromagnetic flow meter that reads 10 m3/h to 120 m3/h is often enough. If the process only runs at 1.5 m3/h, a DN100 meter will sit below its stable range and the signal may drift. In practice, target a flow velocity between 0.5 m/s and 10 m/s. The best measurement window is 1 m/s to 5 m/s for most water, chemical, and wastewater streams.
We have seen this on customer sites many times. An engineer sizes the meter to the pipe instead of the actual batch rate. A DN80 batch reactor line in Brazil was running only 0.8 m3/h during stripping water rinse. The fix was a DN25 meter with reduced connections and a 0.1 m3/h low cut off.
High Conductivity Fluids That Need This Meter
High conductivity means the liquid can carry enough charge for the meter electrodes. Most Silver Instruments magmeters need a minimum of 5 µS/cm. In real plants, water with acid, caustic, salt, or dissolved solids often measures 200 µS/cm to 50 000 µS/cm. Seawater is typically 50 000 µS/cm at 25 °C. A desalination plant in Oman uses a DN150 inline electromagnetic flow meter for brine transfer at 58 °C and 25 bar. The meter has a PTFE liner and titanium electrodes because the brine has high chloride.
Liner and Electrode Selection
Select the liner first. Soft rubber suits water and wastewater up to 60 °C. PTFE suits acid and caustic streams from -25 °C to 120 °C. PFA is preferred for vacuum service, high purity, and temperature up to 150 °C. For abrasive slurry, a polyurethane liner may be better for particles below 2 mm.
Select the electrode second. 316L stainless steel covers clean water and neutral streams. Hastelloy C works for acid, caustic, and wastewater with sulfides. Titanium works for seawater, brine, and chlorinated
Outputs, Approvals, and Installation
Inline electromagnetic flow meters from Silver Instruments support 4-20 mA with HART, pulse output, RS485 Modbus RTU, and optional Profibus DP. The converter can be compact or remote mounted. If the plant has ATEX Zone 1 gas or dust, an explosion proof converter is available.
Use 5 pipe diameters upstream and 3 pipe diameters downstream for most installations. Keep the meter full of liquid. Do not install at the highest point of a line with entrained air. A food grade version with PFA liner and 316L electrodes is available for liquid sugar, syrup, and soy sauce transfer in Southeast Asia. A marine version for ballast water fits DN50 to DN300 with a 24 V DC power option.
Recommended Model Pairing
For clean water, wastewater, and low solids lines from DN15 to DN300, select the Silver Instruments inline electromagnetic flow meter with rubber or PTFE liner and 316L or Hastelloy C electrodes. For chemical acid and caustic batching, use PTFE or PFA liner, Hastelloy C electrodes, and 4-20 mA HART output. For seawater, desalination brine, and salt laden wastewater, use titanium electrodes and PTFE liner. For abrasive mining slurry, ask about a polyurethane liner and a DN80 or larger sensor.
Each meter is factory calibrated on a certified rig. Calibration data is stored in the converter. Standard accuracy is 0.5 percent of reading above 0.5 m/s. For custody transfer or high accuracy blending, a 0.2 percent version is available.
FAQ
What is the minimum conductivity for an inline electromagnetic flow meter? Silver Instruments magmeters need at least 5 µS/cm. Most high conductivity fluids run far above this.
Can an inline electromagnetic flow meter measure low flow? Yes, if the meter size matches the flow range. Use a smaller DN meter to keep velocity above 0.5 m/s.
Can it handle solids or abrasive slurry? The obstructionless design handles many slurries. Select a polyurethane or soft rubber liner for abrasive particles.
What liner and electrode materials are best for high conductivity fluids? Use PTFE or PFA liner for chemical and hot fluids. Use 316L for neutral water, Hastelloy C for acid and caustic, titanium for seawater, and tantalum for concentrated chlorides.
How do I send line data for sizing? Send fluid name, concentration, conductivity in µS/cm, temperature in °C, pressure in bar, pipe size in DN, and flow range to Silver Instruments.
Contact Silver Instruments for an Inline Electromagnetic Flow Meter Quote
Send your full line data and a short process description. A sales engineer will reply with a model, liner, electrode, flange standard, and price.
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
Visit flow-meter.com.au for product data sheets and drawings.
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