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Micro Oval Gear Flow Meter Sizing for Viscous Fluids: ml/min Accuracy
Quick Answer: For viscous fluids like adhesives, resins, and lubricants, a micro oval gear flow meter handles flow rates from 0.5 ml/min to 500 ml/min with high repeatability. Silver Instruments offers these meters in stainless steel or PPS construction, with PTFE seals and ATEX Zone 1 options. Correct sizing requires matching the meter to your fluid viscosity (cP), flow range, and pipe connection.
Why Micro Oval Gear Meters Excel with Viscous Fluids
Micro oval gear flow meters are positive displacement devices. Two oval-shaped gears rotate inside a precision housing. Each rotation displaces a known volume. For viscous fluids above 10 cP, fluid leakage through gaps is very low. This gives high accuracy even at flow rates as low as 1 ml/min. We have seen this on customer sites many times with high viscosity UV adhesives. The meters maintain repeatability of ±0.5 % of reading over a wide viscosity range. Because the gears are lubricated by the fluid itself, wear is minimal. A paint factory in Thailand running 1500 cP epoxy at 30 ml/min told us the meter needed no recalibration for two years.
Flow Range, Viscosity, and Pressure Drop Considerations
Sizing involves three main factors. First, flow range. You need to know the minimum and maximum flow in ml/min. A standard micro oval gear meter covers a 1:50 turndown ratio. For example, a meter rated for 5 ml/min to 250 ml/min keeps linearity across the whole span. Second, viscosity influences pressure drop. At higher viscosities, flow resistance increases. A meter with larger internal clearance might be needed for fluids above 50,000 cP. Most engineers check the pressure drop curve at the highest expected viscosity. Third, pipe connection size. Most micro meters use DN4, DN6, or DN10 connections. Compression fittings for stainless steel tubing are common. For a hygienic CIP process, Tri-clamp ends are also available.
Real-World Sizing: From Paint to Adhesives
A paint manufacturer in Vietnam needed to dose solvent-borne paint into 5 liter cans. The paint viscosity was 800 cP at 25 °C. They required a flow range of 50 to 300 ml/min with a pulsed output for a PLC. Silver Instruments supplied a micro oval gear meter with 316L stainless steel gears, PTFE seals, and NPN open collector pulse output. The DN6 connections fit directly into their filling line. The meter still works without maintenance after 18 months. Another example involves a lubricant blending plant in Saudi Arabia. They injected high viscosity additive into base oil. The additive had a viscosity of 20,000 cP at 40 °C. Flow range was 2 to 50 ml/min. We recommended an integrated PT100 temperature sensor and 4-20 mA HART output for remote monitoring. The meter body was 316L, and the seals were FKM. Because the fluid was heated, we verified the temperature rating up to 120 °C. The installation ran smoothly.
Key Configuration Options for Your Application
Configuration options include gear material. PPS
Getting a Quote from Silver Instruments
Do not guess the sizing. Send us your fluid parameters. Tell us the fluid name, viscosity at operating temperature in cP, minimum and maximum flow rate in ml/min, pipe size (DN), operating pressure in bar, and temperature in degree Celsius. Our engineers select the correct micro oval gear meter, prepare a dimensional drawing, and provide a price. Typical response time is one business day. Email [email protected] or visit flow-meter.com.au and submit the inquiry form. We have supplied over 300 micro oval gear meters across Southeast Asia, the Middle East, and Latin America for chemical dosing, adhesive dispensing, and lube oil blending.
FAQ on Micro Oval Gear Flow Meters for Viscous Fluids
What flow range can a micro oval gear meter measure?
Typical ranges span from 0.5 ml/min up to 500 ml/min. Custom ranges up to 1000 ml/min are possible on request. We match the internal gear size to your target span.
Which viscosity fluids are suitable?
The meter works best above 10 cP and can handle up to 100,000 cP. Very low viscosity fluids below 5 cP may cause higher leakage and reduced accuracy. We usually recommend alternative technology for water-thin liquids.
Can Silver Instruments meters handle corrosive chemicals?
Yes. Choose PPS gears and PTFE seals for strong acids or organic solvents. We have supplied meters for sulfuric acid dosing in water treatment plants in the Philippines. Provide a full chemical compatibility list, and we verify material selection.
What output signals are available?
Pulse (NPN or PNP open collector), 4-20 mA HART, and RS485 Modbus RTU. The 4-20 mA HART version also transmits fluid temperature when an integrated PT100 is ordered. This helps in condition monitoring without extra sensors.
How do I size the meter for a filling machine?
Provide the dispense volume per cycle and the cycle time. Our team calculates the required instantaneous flow rate in ml/min. For example, a 250 ml fill in 5 seconds needs 3,000 ml/min, which exceeds the standard micro range. In such a case we confirm whether a larger oval gear meter or a different technology fits better.
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