crude oil flow meter DN100

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# Oval Gear Flow Meter for Diesel: Specs, Accuracy, and Selection Guide **Quick Answer:** An oval gear flow meter measures diesel flow by counting rotations of two precision‑machined oval gears inside a chamber. It delivers ±0.5% accuracy for diesel with viscosity between 1 and 1000 cP. To get a quote, send us your flow range (L/h or kg/h), temperature (°C), and pipe size (DN). For diesel loading and transfer, this meter is a reliable choice because it does not need a straight pipe run. ## How an Oval Gear Flow Meter Works with Diesel The meter has two oval gears that rotate as diesel passes through. Each rotation captures a fixed volume of fluid. The gears push the diesel from the inlet to the outlet. A magnetic sensor counts the gear rotations and sends pulses to a display or control system. This direct displacement method works well for diesel because the fluid has stable viscosity and low gas content. Most engineers skip this part: the gear clearance is tight, usually 0.02 mm to 0.05 mm. That small gap prevents leakage without causing excessive friction. For diesel at 3 cP to 8 cP, this clearance gives good accuracy. For higher viscosity diesel blends, you might need a larger clearance. We have seen this on customer sites many times last year a customer in Vietnam asked us to supply meters for diesel fuel delivery to fishing boats. They needed meters that handle diesel with some water contamination. Our oval gear meter with PTFE lining worked well there. ## Key Specifications for Diesel Service | Parameter | Typical Range | Notes | |-----------|---------------|-------| | Viscosity | 1 cP to 1000 cP | Diesel is 2–8 cP at 40°C | | Accuracy | ±0.5% to ±0.2% | ±0.5% is standard, ±0.2% with calibration | | Flow rang crude oil flow meter DN100

e | 0.5 L/h to 120,000 L/h | Depends on meter size | | Pressure rating | PN16 to PN40 | Standard for diesel systems | | Temperature | –20°C to +150°C | For diesel, 0°C to +80°C is typical | | Output | 4‑20 mA HART, pulse, RS485 | Choose based on your PLC | The meter size selection starts with flow rate. For a diesel transfer pump running at 500 L/h, a DN15 or DN20 meter works. For a truck loading station at 40,000 L/h, you need a DN50 or DN80 meter. We have a paint manufacturer in Southeast Asia who uses DN25 oval gear meters for blending diesel colorants. The accuracy was critical because the colorant is expensive. ## Why Choose Oval Gear over Other Diesel Flow Meters For diesel, you have options: turbine, ultrasonic, Coriolis, and oval gear. Here is the comparison based on real installations. Turbine meters need a straight pipe run of 10 diameters upstream and 5 downstream. In a refueling station, that space is not always available. Oval gear meters need no straight pipe. They work at the pump outlet directly. Ultrasonic meters struggle with diesel when the flow is low or when the diesel has bubbles. During tank bottom transfer, you get air entrainment. An oval gear meter handles small amounts of air without losing accuracy. Coriolis meters give great accuracy but cost 2–3 times more than oval gear. For diesel transfer where ±0.5% is sufficient, oval gear is the economic choice. A food and beverage company in Brazil installed our oval gear meters for diesel used in their boiler system. They replaced Coriolis meters and saved 60% on the cost. ## Material Options for Diesel Diesel is not corrosive but it does dissolve some plastics. Here are the material combinations we use. | Component | Standard Material | Opt

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