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Digital Oval Gear Flow Meter: Heavy Viscosity Fluid Senses Sizing Specifications
Quick Answer: A digital oval gear flow meter measures heavy viscosity fluids such as heavy oil, resin, molasses, and diesel with repeatable positive displacement sensing. Sizing depends on viscosity (cP), minimum and maximum flow rate, pipe size, pressure drop, and fluid temperature. Silver Instruments supplies digital oval gear flow meters with pulse, 4-20 mA HART, and Modbus RTU outputs.
How a Digital Oval Gear Flow Meter Handles Heavy Viscosity Fluid
An oval gear meter belongs to the positive displacement family. Two oval shaped gears rotate inside a measuring chamber. Every full rotation traps a known fluid volume. A digital pickup senses gear movement through the chamber wall. This sensing method does not need straight pipe runs. The meter works when turbine meters stall or electromagnetic meters cannot read nonconductive oil.
Heavy viscosity fluid includes fuel oil, lube oil, epoxy, paint, molasses, and bitumen. In practice, viscosity from 5 cP to 100,000 cP can be measured. The key is to keep gears turning without high pressure drop. Because thick fluid resists movement, the meter body and bearing materials must match the fluid. Silver Instruments uses cast iron, stainless steel, and aluminum bodies. Gears come in PPS, aluminum, or stainless steel depending on fluid chemistry.
Sizing Specifications for Digital Oval Gear Meters
Sizing is not only about pipe size. You need four data points. Minimum flow, normal flow, maximum flow, and viscosity at operating temperature. Most engineers skip temperature. Skipping temperature causes trouble because viscosity drops as temperature rises. A heavy fuel oil may be 15,000 cP at 25 °C but only 900 cP at 80 °C.
Typical sizes run from DN10 to DN100 for Silver Instruments digital oval gear flow meters. A DN15 meter can cover 0.3 L/min to 30 L/min for light oil. A DN25 meter handles 2 L/min to 100 L/min for paint at 60 °C. For high viscosity fluid at 50,000 cP, select the next larger meter. This keeps pressure drop below 0.5 bar. We have seen this on customer sites many times. A resin producer in Malaysia ordered a DN40 meter initially. The resin was 45,000 cP at ambient temperature. The meter was too small. Pressure drop reached 1.3 bar. The replacement was DN50. Pressure drop settled at 0.4 bar and flow rate stayed accurate.
For a heavy oil burner at 300 L/h, a DN15 digital oval gear flow meter with pulse output fits. For a paint filling line at 120 L/min, a DN40 unit with 4-20 mA HART avoids pressure drop above 0.5 bar. Both examples are typical pairings we recommend.
Sensor Types and Output Signals
Digital oval gear flow meters from Silver Instruments have different pickup options. Hall effect pickup gives high resolution pulse output. Hall effect pickup works well for batching and totalizing. A reed switch sensor is simpler and costs less. Reed switch suits low frequency total flow reading. 4-20 mA output transmits flow rate to a PLC or panel meter. Modbus RTU and HART are available for systems that need digital data.
For hazardous areas, an ATEX Zone 1 sensor option is available. The display can be local or remote. A local display shows total flow and flow rate. The unit can be calibrated in liters, gallons, or kilograms per hour if density is fixed.
Sizing Steps for Heavy Viscosity Fluid
First, list your fluid name and viscosity at two temperatures. Second, note the normal and maximum flow rate in L/h or kg/h. Third, check pipe size and connection t
Silver Instruments will check pressure drop across the meter. We verify that the selected meter runs between 10 percent and 90 percent of its full range. The sweet spot is 30 to 70 percent. Below 10 percent, leakage past the gears hurts accuracy. Above 90 percent, accelerated wear shortens gear life.
When Heavy Viscosity Fluid Sensing Fits Better Than Other Meter Types
A turbine meter needs clean low viscosity fluid. An electromagnetic meter is ruled out when the liquid is oil or solvent. Ultrasonic flow meters often struggle with heavy viscous flows. Oval gear meters do not need conductivity or straight run. They deliver total volume and rate in one device. For oil blending, filling machines, burner consumption, and resin dosing, the oval gear meter is a practical choice.
Last year a customer in Vietnam asked us to replace a turbine meter on a diesel generator test stand. The fluid was light gas oil at 35 °C. A DN15 digital oval gear flow meter with pulse output solved the issue. The installation took less than one afternoon.
Materials and Fluid Compatibility
Stainless steel bodies suit food and beverage plants. Cast iron bodies fit fuel and lube oil service. Aluminum is a lighter choice for low pressure lines. Gears can be PPS, aluminum, stainless steel, or cast iron. PPS is common for diesel and light chemical. Stainless steel gears are used for water and food grade product. Seals are FKM, PTFE, or EPDM. Select the seal based on fluid type and temperature.
Price and Quotation Inputs
Price depends on size, body material, sensor type, display option, and hazardous area rating. A basic DN15 aluminum oval gear flow meter with pulse output costs less than a DN50 stainless steel unit with HART and remote display. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will recommend a model and send a quotation.
Contact Silver Automation Instruments at Tel: +86-25-68650347. You can also reach us on Whatsapp: +86-25-52155837 or WeChat: +86 15365082610. For product pages, see the oval gear flow meter section on flow-meter.com.au.
FAQ: Digital Oval Gear Flow Meter for Heavy Viscosity Fluid
What is the maximum viscosity a digital oval gear flow meter can handle?
Silver Instruments oval gear flow meters handle up to 100,000 cP. High viscosity fluids need a larger meter to reduce pressure drop. We check gear material and bearing material for each case.
How do I size a digital oval gear flow meter for heavy oil?
Provide fluid name, viscosity at operating temperature, minimum and maximum flow rate, pipe size, and connection type. We select a meter that runs at 30 to 70 percent of full range.
Can a digital oval gear flow meter measure diesel and light oil?
Yes. Oval gear meters work well for diesel, light fuel oil, lube oil, and mineral oil. The positive displacement sensing method offers repeatable total flow. Pulse output suits fuel consumption monitoring.
What output options does Silver Instruments provide?
Pulse, 4-20 mA, HART, and Modbus RTU are available. Local display can show total and rate. ATEX Zone 1 sensor option is offered for hazardous areas.
What should I send for a fast quotation?
Send fluid name, viscosity (cP), pressure (bar), temperature (°C), pipe size (DN), flow range (L/h or kg/h), and output signal. Contact us via Tel, Whatsapp, or WeChat. We reply with sizing and price.
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