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Concrete Flow Meter: Gravimetric Chute Conveyor System Particulate Sizing
Quick Answer
For a concrete plant with gravimetric chute conveyors, the first meter to install is an electromagnetic flowmeter on the batch water line. Use a Coriolis mass flow meter for cement admixture and a vortex meter for steam or compressed air if curing controls need it. Silver Automation Instruments supplies all three types with 4-20 mA HART output, DN10 to DN300 sizes, and prices from roughly USD 420 for a DN25 water meter.
Why Concrete Flow Meter Selection Starts With Water
Water volume controls the water cement ratio. That ratio decides strength, workability, and crack risk. A batch mixer in a ready-mix plant may dose 150 kg of water into a 3 cubic metre mix. A 2 percent error equals 3 kg of water. That sounds small. In a 30 MPa concrete mix, 3 kg can shift slump by 20 mm.
Most plants already have load cells under the aggregate bins and conveyor belt. The missing signal is often water flow. A gravimetric chute conveyor system can weigh sand, stone, and cement with good repeatability. But if the water meter drifts, the whole batch drifts. Here is the thing. Aggregate weight alone does not fix mix quality.
Gravimetric Chute Conveyor System and Where the Flow Meter Fits
A gravimetric chute conveyor system uses a load chute or weigh section to batch aggregates by mass before discharge into the mixer. The PLC also receives signals from a water flow meter, additive flow meter, and sometimes a slurry flow meter. The sequence is simple. Open the water valve. Count pulses from the flow meter. Close the valve when the target mass or volume is reached.
In practice, many plants use a paddle wheel meter because the initial cost is low. The problem starts when recycled water carries sand, cement fines, and aggregate dust. A paddle wheel jams or reads low. Silver Instruments has supplied electromagnetic flowmeters to ready-mix plants in Vietnam, Malaysia, and the Philippines for this exact issue. The electromagnetic meter has no moving parts and can pass small particles without clogging.
Particulate Sizing and Its Effect on Water Metering
Particulate sizing refers to the particle size distribution of sand, crushed stone, gravel, and cement. A change from a 20 mm maximum aggregate to a 10 mm maximum aggregate increases water demand. In one precast plant in Mexico, the water absorption of a batch changed from 6.2 percent to 7.9 percent after switching from river sand to manufactured sand. The plant needed a meter with repeatability better than 0.2 percent on a 500 kg water batch.
For that job, Silver Instruments recommended a DN40 SIL-EMF electromagnetic flowmeter with 0.2 percent accuracy and PTFE liner. The meter sent 4-20 mA HART to a Siemens PLC. The batch controller used a tighter water alarm band. After the change, the slab weight variance dropped from 1.8 percent to 0.7 percent.
Recommended Concrete Flow Meter Models
The SIL-EMF series electromagnetic flowmeter covers water, recycled water, and thin cement slurry. It is available from DN10 to DN300. Standard accuracy is 0.5 percent, with an optional 0.2 percent version for small batch water lines. Liners include PTFE, polyurethane, and hard rubber. Electrodes include 316L, Hastelloy C, and titanium. Output is 4-20 mA HART, pulse, and RS485 Modbus. The liquid needs conductivity above 5 µS/cm. For concrete water lines from DN25 to DN100, the price range is roughly USD 420 to USD 980 ex-works.
The SIL-CMF series Coriolis mass flow meter is for polycarboxylate admixture, air entraining agent, and other additives. It measures kg/h, density, and temperature in one device. A DN15 meter handles 0 to 300 kg/h of admixture at 5 to 30 cP. Accuracy is 0.2 percent of rate for mass flow. This meter is more expensive, starting around USD 2,600 ex-works, but it removes the need for separate density
The SIL-VF series vortex flow meter works for steam, compressed air, and natural gas around a concrete curing system. It is available from DN15 to DN200 and handles fluid temperature up to 250 °C. For steam mass measurement, pair the vortex meter with a PT100 temperature sensor and a pressure transmitter. Output options match the same 4-20 mA HART format used by the electromagnetic meter.
Field Notes From Concrete Plants
A ready-mix plant in Malaysia replaced a paddle wheel meter with a DN80 SIL-EMF after sand fines in recycled water caused repeated under reading. The old meter read 9.5 m3/h when the actual flow was 11.2 m3/h. The batch controller added too much water. Strength tests fell below the required 30 MPa at 28 days. After the change to electromagnetic, the plant held water dose within plus or minus 0.8 percent.
A precast factory in Saudi Arabia uses a DN15 SIL-CMF on admixture. The admixture has 22 percent solids and viscosity near 18 cP. The plant runs at 45 °C in summer. The Coriolis meter gives mass flow directly, so the control system does not need a separate density table.
Most engineers skip this part. The flow meter needs a straight run before and after the sensor. For a DN50 electromagnetic meter, keep 5 diameters upstream and 3 diameters downstream. If there is not enough straight pipe, the meter can still read, but the reading may be noisy. Use grounding rings when the pipe is lined or made of plastic.
How to Request a Quote for a Concrete Flow Meter
Send us the water flow range in m3/h, pipe size DN, operating pressure in bar, temperature in °C, and slurry solids percent if you have recycled water. For admixture, send flow range in kg/h and viscosity in cP. We will reply with a model selection and price. Our sales team does not ask for a credit card up front and we do not charge for drawings.
Silver Instruments contact details are here. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610. We ship to plants in Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
FAQ
What is the best concrete flow meter for a batching plant?
An electromagnetic flowmeter is the best first choice for batch water, recycled water, and thin cement slurry. It has no moving parts. It handles particles and gives repeatable volume measurement. For admixture, use a Coriolis mass flow meter because mass is the direct control unit.
Can a magnetic flow meter measure cement slurry?
Yes. A magnetic flow meter measures conductive liquid. Cement slurry is conductive. Choose a PTFE or polyurethane liner and a 316L or Hastelloy electrode. Keep velocity above 0.5 m/s for stable reading.
What size flow meter do I need for a 60 m3/h water line?
A DN50 electromagnetic flowmeter works well for 10 to 60 m3/h. A DN80 meter handles 20 to 120 m3/h with less pressure drop. For a 60 m3/h main line, many plants choose DN80 to leave room for future batching capacity.
Does Silver Instruments offer ATEX or explosion proof concrete flow meters?
Yes. The SIL-EMF and SIL-CMF series can be configured with ATEX Zone 1 or Zone 2 approvals. This applies to plants with flammable admixtures, dust zones, or solvent based curing compounds. Send the hazardous area classification with your inquiry.
What is the typical price for a concrete flow meter?
A DN25 SIL-EMF electromagnetic water meter starts at about USD 420 ex-works. A DN50 model is about USD 520 to USD 680 depending on liner and signal output. A DN15 SIL-CMF Coriolis mass flow meter for admixture starts at about USD 2,600 ex-works.
For a gravimetric chute conveyor system upgrade, send the conveyor scale output signal, the batch size, and the water line diameter. We will quote the meter and wiring diagram in one working day.
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