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Quick Answer: Silver Automation Instruments supplies inline electromagnetic flow meters for conductive slurries with repeatability down to plus or minus 0.1 percent of reading. These magmeters measure slurries with conductivity as low as 5 µS/cm in line sizes from DN25 to DN1200. Send us your pipe size in DN, solids content, flow range, pressure in bar, and temperature in °C for a quote.
Electromagnetic flow meters work well on conductive slurries because they have no moving parts and no internal obstructions. The inline design handles abrasive solids, high viscosity, and varying density without frequent mechanical wear. Silver Instruments builds these meters for mining, wastewater, paper stock, food slurry, and chemical applications.
In batching and dosing, repeatability matters more than a laboratory accuracy claim. Most plants need the same reading at the same flow condition every shift. Silver Automation Instruments inline magmeters hold repeatability at plus or minus 0.1 percent of reading. Accuracy is plus or minus 0.5 percent of reading as standard. Optional calibration improves that to plus or minus 0.2 percent.
Here is the thing. A 1 percent drift can cost more than a small accuracy offset in a continuous process. If you dose polymer into a sludge line, the flow signal must stay stable across weeks. An electromagnetic flow meter with high repeatability gives the control system a stable value. That reduces valve hunting and product waste.
An inline electromagnetic flow meter sits directly in the process pipe. There is no bypass loop and no flow conditioning section. The sensor has a full bore matched to the pipe ID. For conductive slurries, the full bore design helps solids pass through without blocking. The meter measures voltage generated by the conductive liquid moving through a magnetic field. Minimum conductivity is 5 µS/cm for most sizes.
Because the meter has no obstruction, pressure loss is nearly zero. That is a big advantage on long slurry pipelines. A DN150 meter on a 6 inch tailings line adds almost no pumping cost. Silver Instruments has supplied this setup to copper mines in Indonesia and Chile.
Slurry wear hits the liner and electrodes first. For abrasive mining slurries, a polyurethane liner or soft rubber liner usually lasts longer than PTFE. For chemical slurries with temperature above 120 °C, PFA or PTFE works better. Electrode material depends on the slurry chemistry. 316L stainless steel suits water and wastewater sludge. Hastelloy C handles oxidizing chemicals and acid slurries. Titanium handles seawater and brine. Tantalum handles strong acids. Platinum iridium handles high temperature and aggressive media.
Silver Instruments recommends polyurethane liners for tailings, dredging, and coarse sand slurries. Hard rubber liners work well for fine mineral slurries with particles below 2 mm. For food slurry like tomato paste or starch slurry, use 316L electrodes and a PTFE or PFA liner with CIP and SIP temperature ratings.
When you send an inquiry, include the following six items: pipe size in DN, flow range in m3/h, process pressure in bar, process temperature in °C, slurry solids content in percent, and electrical conductivity in µS/cm. With these values the Silver Instruments team can quote the right liner, electrode, and transmitter.
Standard specifications for Silver Automation Instruments inline electromagnetic flow meters for conductive slurries include DN25 to DN1200 line sizes with larger sizes on request. Minimum conductivity is 5 µS/cm. Repeatability is plus or minus 0.1 percent of reading. Accuracy is plus or minus 0.5 percent of reading as standard with an optional calibration to plus or minus 0.2 percent. Process temperature ranges from minus 25 °C to 180 °C depending on liner. Pressure ratings are PN10, PN16, PN25, PN40, and higher on request.
Outputs include 4 to 20 mA HART, pulse, frequency, Modbus RS485, and optional Profibus DP. Transmitters are available in compact or remote mount. Power options include 24 V DC or 85 to 265 V AC. Sensor protection is IP67 with IP68 optional for flooded pits. Hazardous area versions meet ATEX Zone 1 and IECEx requirements. An empty pipe detection feature is standard on the remote transmitter. Viscosity does not affect the measurement because the meter measures flow velocity directly.
Place the meter at least 5 straight pipe diameters upstream and 2 diameters downstream from elbows or valves. For slurry service, use 10 diameters upstream if the slurry is prone to solids settling. Install the sensor in a vertical line or at the low point if possible. This keeps solids suspended and reduces coating on electrodes.
Do not install the meter on the suction side of a pump if cavitation is possible. The bubbles cause unstable readings. Use a downstream location after a degassing valve. Provide an earthing ring or grounding electrode when the pipe is non-conductive or lined with plastic. Most engineers skip this part and then blame the meter for noise.
A copper mine in Indonesia replaced a mechanical turbine meter on a DN150 tailings line with a Silver Instruments polyurethane lined electromagnetic flow meter. The slurry had 35 weight percent solids and a density of 1.6 kg per liter. Flow was 210 m3/h at 4.5 bar. The meter held repeatability at plus or minus 0.1 percent for six months. The plant then ordered four more meters for concentrate and reclaim water lines.
Last year a customer in Vietnam asked Silver Automation Instruments for a DN200 meter on paper pulp stock at 3 percent consistency and 60 °C. The supply included a hard rubber liner with 316L electrodes and a remote transmitter. The meter now runs 24 hours per day with no cleaning cycle. The pulp mill maintenance team has not touched the meter since installation.
Tell us the application and the six parameters listed above. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. Also state the slurry type and solids content. Silver Instruments will recommend the liner, electrode, grounding, and transmitter configuration. A typical quote covers the meter body, transmitter, calibration certificate, and packing for export.
Contact Silver Automation Instruments by phone or WhatsApp. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610. You can also visit flow-meter.com.au for more product specifications.
What minimum conductivity is required for an electromagnetic flow meter?
Most Silver Instruments slurry magmeters need at least 5 µS/cm. For very low conductivity fluids, contact the engineering team because electrode type and transmitter gain can change the limit.
Can an electromagnetic flow meter handle abrasive solids like sand or tailings?
Yes. Use a polyurethane or hard rubber liner. The full bore design has no moving parts and no internal restriction. Liner life depends on flow velocity, particle size, and concentration. Keep velocity between 2 and 5 m/s for abrasive service.
What is the difference between accuracy and repeatability?
Accuracy is the closeness to a reference standard. Repeatability is the ability to produce the same output under the same conditions. In slurry dosing and batching, repeatability usually matters more. Silver Instruments meters hold repeatability at plus or minus 0.1 percent of reading.
Which liner is best for chemical slurry with acid and high temperature?
PFA or PTFE liners work well for chemical slurries up to 180 °C. Select Hastelloy C or tantalum electrodes based on the acid type and concentration. Send Silver Instruments the full chemical composition and temperature for a firm recommendation.
Do you supply meters for remote locations and export markets?
Yes. Silver Automation Instruments exports to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. The packing is suitable for sea freight and every meter includes calibration certificates and manuals in English. Contact Tel: +86-25-68650347 for a quote.
