heavy fuel oil flow meter DN200

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# Oval Gear Flow Meter for Diesel: How It Works, Accuracy, and Selection **Quick Answer:** An oval gear flow meter measures diesel flow by counting rotations of two precisely machined oval gears inside a chamber. It delivers ±0.5% accuracy for diesel at viscosities from 1 cP to 1000 cP, handles pressures up to 100 bar, and requires no external power. For a diesel generator or fuel delivery truck, send us your flow range (L/min or kg/h), pressure (bar), temperature (°C), and pipe size (DN). --- ## What Is an Oval Gear Flow Meter? An oval gear flow meter is a positive displacement (PD) flow meter. It uses two oval shaped gears that rotate as liquid passes through the metering chamber. Each rotation traps a fixed volume of fluid. A magnetic pickup or reed switch counts the rotations and converts them into a flow rate or total volume. The design is simple, no electronics inside the chamber. Only the gears and chamber walls contact the liquid. This makes oval gear meters reliable for diesel, crude oil, biodiesel, and other hydrocarbon liquids. **Most engineers skip this part:** The clearance between the gears and chamber wall is typically 0.02 mm to 0.05 mm. That tiny gap determines the meter’s slip and low flow accuracy. --- ## Why Oval Gear for Diesel? Diesel has low viscosity compared to heavy fuel oil. At 20°C, diesel viscosity is about 2 to 4.5 cP. That is low enough for some turbine meters but high enough to cause wear in certain designs. Oval gear meters handle this range well because: - No flow straightener needed. Install it with minimal straight pipe runs, 5 DN upstream and 2 DN downstream usually enough. - No moving parts other than the gears. No shafts, bearings, or impellers that can corrode or foul. - heavy fuel oil flow meter DN200

Works from 0.5 L/min to 100 L/min in standard sizes. For larger flows, use multiple meters in parallel or a larger model. **Here’s the thing:** A customer in Vietnam asked us last year for a diesel meter on a fuel delivery truck. They tried a turbine meter first. The turbine blades stuck after six months because of diesel’s paraffin content at low temperature. They switched to oval gear, no issues since. --- ## Accuracy: What You Can Expect Oval gear flow meters for diesel typically achieve ±0.5% accuracy across a 10:1 turndown. Some manufacturers claim ±0.2% with calibration. But in field conditions, real accuracy depends on: - **Viscosity.** Lower viscosity diesel means more slip between gears. At 2 cP, slip is higher than at 5 cP. Always specify your actual diesel viscosity when ordering. - **Flow rate.** Accuracy degrades below 20% of maximum flow. For diesel, keep the flow above 30% of the meter’s rated capacity for best results. - **Temperature.** Diesel expands with temperature. A meter calibrated at 20°C will read slightly high at 40°C. Use a PT100 RTD and density correction if you need better than ±1% accuracy over temperature range. - **Pressure.** High backpressure increases slip. For diesel applications up to 16 bar, this is negligible. Above 50 bar, check the meter’s pressure rating. **We have seen this on customer sites many times:** A paint manufacturer in Southeast Asia used an oval gear meter for diesel boiler fuel. Their diesel temperature ranged from 15°C to 45°C. Without temperature compensation, the error reached 1.8%. After adding a PT100 and a Silver Instruments F3000 totalizer with density input, error dropped to 0.4%. --- ## How to Select an Oval Gear Meter for Diesel ### Step 1: Define

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