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Dry Solids Flow Meter: Gravimetric Impact Chute Powder Sizing Scale Systems
Quick Answer: A gravimetric impact chute dry solids flow meter measures powders, granules, and flakes by mass, not volume. Silver Instruments supplies this powder sizing scale system with a load cell, impact plate, and transmitter. The output is usually 4-20 mA HART or Modbus RTU for batching, dosing, and totalizing.
What a Gravimetric Impact Chute Flow Meter Measures
This instrument handles dry bulk materials such as cement, fly ash, flour, sugar, plastic pellets, lime, mineral powder, and grain. It works best with free-flowing solids. Sticky or fibrous materials can build up on the plate. In that case we recommend a different measuring principle.
The flow meter reports mass flow rate in kg/h or t/h. It also provides totalized tonnage. Operators use this total for raw material dosing and batch records.
How the Impact Plate Load Cell Works
Material enters through the process connection, often DN80 to DN300. Product falls through a feed guide and strikes an angled plate. The impact force on the plate is proportional to mass flow rate. A strain gauge load cell converts that force into an electrical signal.
Because the measurement is gravimetric, changes in material density do not ruin the reading. This is the key difference from volumetric screw feeders or capacitive sensors. The load cell signal goes to a transmitter. The transmitter delivers 4-20 mA HART, Modbus RTU, or pulse output.
Why Gravimetric Beats Volumetric for Dry Solids
Volumetric devices infer flow from volume. A gravimetric impact chute scale measures force directly. If bulk density shifts from 0.4 to 0.6 kg/L, a volumetric unit will misreport the mass. The impact plate will still track true mass within its accuracy band.
Most users see accuracy near 0.5 percent to 1.0 percent of full scale across a 10 to 1 turndown. Repeatability is usually better than 0.5 percent. This matters when you are blending a batch or reporting consumption to regulators.
Key Specs for Dry Solids Flow Meter Sizing
We ask for these values before quoting a dry solids impact flow meter. Send us your material name, bulk density in kg/m³, particle size in mm, moisture content, max feed rate in t/h, chute angle, and process connection size.
Standard units cover flow rates from 0.2 t/h to 200 t/h. Process connections range from DN80 to DN300 depending on particle size. Material temperature is commonly -20 to 60 °C. For hot powders up to 150 °C we add a high temperature load cell and cooling adapter. Enclosure rating is IP65. For dusty or fuel dust zones we supply ATEX Zone 21 or Zone 22 certification.
The output can be 4-20 mA HART, Modbus RTU, or pulse. Power options include 24 V DC and 220 V AC. This matches most plant PLC and DCS systems in Southeast Asia, the Middle East, and Latin America.
Typical Applications Across Industries
A cement plant in Vietnam uses the impact chute meter on a fly ash injection line. The unit totals 35 t/h with an accuracy near 0.5 percent of full scale. That plant feeds the 4-20 mA signal to a PLC for closed loop control.
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A mineral processing site in Australia reads mass flow of mill feed with a DN200 chute scale. The Modbus RTU totalizer feeds a daily production report. A chemical blender in Mexico uses the same transmitter on a lime dosing line.
Installation and Calibration Tips
In practice, a rotary valve, screw feeder, or belt feeder works well as a steady feed source. Install the meter below that feeder. Material should flow smoothly. Sudden slugs from a pneumatic line will disturb the reading. Use a stabilizer or vented feed chute if needed.
Most engineers skip this part. Keep the load cell free from dust buildup. Purge air or a flexible boot helps. Calibrate in place with a known weight or a material test. We have seen many customer sites where zero drift comes from dust packing around the load cell, not from the sensor itself.
Silver Automation Instruments Support and Pricing
Silver Instruments supplies the dry solids flow meter as a complete powder sizing scale system. The package includes the impact chute body, load cell, and transmitter. We can add a local display, ATEX approval, ceramic lining, or a remote panel.
Price depends on material, flow range, connection size, and certification. Tell us your material name, bulk density in kg/m³, max feed rate in t/h, particle size in mm, and process connection size. We will return a quote with lead time and freight to your site.
You can reach our sales engineers on Tel: +86-25-68650347, Whatsapp: +86-25-52155837, or WeChat: +86 15365082610.
Dry Solids Flow Meter FAQ
Which bulk materials work with an impact chute flow meter? Free-flowing powders, granules, flakes, and small pellets work best. Examples include cement, fly ash, flour, sugar, lime, plastic pellets, and mineral powders. Avoid sticky or fibrous materials.
What accuracy can I expect? A typical impact chute scale gives 0.5 percent to 1.0 percent of full scale. Repeatability is usually better than 0.5 percent. Calibration with your actual material improves performance.
Can this meter work in a hazardous area? Yes. We supply ATEX Zone 21 and Zone 22 versions for combustible dust environments. Some models also suit Zone 20 with a special load cell and barrier.
What is the difference between this and a belt scale? A belt scale measures material on a conveyor. An impact chute meter measures force inside a falling stream. The impact chute is smaller, easier to install, and often lower cost for free-flowing solids.
How do I choose between DN100 and DN200? Base it on peak feed rate and particle size. For most powders up to 20 t/h a DN100 or DN150 body works. For coarse granules above 30 mm or rates above 60 t/h we usually recommend DN200 or DN300.
For dry solids, send us your material name, bulk density in kg/m³, max feed rate in t/h, particle size in mm, and process connection size. For liquid and gas flow meters, send us your pressure (bar), temperature (°C), pipe size (DN), and flow range.
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