gasoline flow meter DN100

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# Oval Gear Flow Meter for Diesel: Accuracy, Viscosity Limits, and Pricing Guide **Quick Answer:** Oval gear flow meters measure diesel flow by trapping fixed volumes between rotating gears, delivering ±0.5% accuracy across viscosities from 1 to 1000 cP. A DN25 meter with 4-20 mA HART output costs roughly USD 350–600 from Silver Instruments. Send us your diesel temperature, pressure, pipe size, and expected flow range for a quote. ## How Oval Gear Meters Work with Diesel The meter has two oval-shaped gears inside a chamber. When diesel flows through, the differential pressure pushes the gears to rotate. Each full rotation traps and releases a fixed volume of liquid. A magnetic pickup or reed switch sends pulses to a display or control system. This is positive displacement technology. It measures actual volume passing through, not inferred velocity like ultrasonic or electromagnetic meters. For diesel with changing viscosity and temperature, this direct measurement matters most. ## Why Oval Gear Meters Fit Diesel Applications Better Than Alternatives Most engineers pick oval gear for diesel because viscosity changes dont affect accuracy. Here is what happens with other meter types: - **Coriolis meters** work fine but cost USD 2000–5000 for the same pipe size. Overkill for diesel batching. - **Ultrasonic meters** struggle when diesel is cold and thick (above 10 cP). Signal loss happens below 30 cP depending on transducer frequency. - **Turbine meters** have moving blades that wear with diesel contaminants. Calibration drifts after 6–12 months in dirty applications. - **Electromagnetic meters** need conductive liquids. Diesel has conductivity below 0.1 µS/cm, so they read zero. A paint manufacturer in Indonesia swit gasoline flow meter DN100

ched from ultrasonic to oval gear for diesel transfer last year. Their repeatability improved from ±2% to ±0.3%. They paid USD 480 for a DN20 meter with pulse output. ## Accuracy and Viscosity Ranges for Diesel Diesel Diesel fuel viscosity ranges from 1.5 to 5.5 cP at 40°C depending on grade. Cold diesel at 0°C can reach 10–20 cP. Oval gear meters handle this without issues. **Accuracy specifications:** - Standard grade: ±0.5% of reading - High precision: ±0.2% of reading - Repeatability: ±0.05% (same batch, same conditions) **Viscosity limits by meter material:** - Aluminum body: 1–300 cP - Cast iron body: 1–1000 cP - Stainless steel body: 1–2000 cP (for aggressive fuels) Most diesel applications stay below 100 cP. Even with winter diesel at −10°C, you rarely exceed 50 cP. So standard aluminum works fine in warm climates. For cold regions, cast iron gives safety margin. Last year a customer in Vietnam asked us for a meter to measure diesel at 80°C (preheated for combustion). We recommended stainless steel high-temperature version with PTFE gears and Viton seals. Standard aluminum would fail above 60°C. ## Key Specifications for Oval Gear Diesel Meters **Flow range by pipe size:** - DN15: 0.5–50 L/min - DN20: 1–100 L/min - DN25: 2–200 L/min - DN40: 5–400 L/min - DN50: 10–800 L/min **Pressure and temperature limits:** - Standard: 16 bar, −20°C to +80°C - High pressure: 63 bar (for diesel injection lines) - High temperature: up to 200°C with specific seals **Output options:** - Pulse (reed switch, Hall effect, or NPN open collector) - 4-20 mA analog (with built-in transmitter) - 4-20 mA HART (for remote configuration) - RS485 Modbus (for PLC integration) **Power supply:** - Battery powered totalizer: 3.6V lithiu

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