lubricating oil flow meter DN25

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# Oval Gear Flow Meter for Diesel: Accuracy, Viscosity, and Real-World Installation Guide **Quick Answer:** An oval gear flow meter is the most reliable choice for diesel flow measurement due to its positive displacement principle. It handles diesel’s low viscosity (2–5 cP) with ±0.5% accuracy and works with 4-20 mA HART output. To get a quote, send us your pressure (bar), temperature (°C), pipe size (DN), and flow range (L/min or m³/h). --- ## Project Background I work on the marketing team at Silver Automation Instruments (www.flow-meter.com.au). We sell industrial flow meters and process instruments globally. Our main products include Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, thermal mass flow meters, pressure transmitters, and paperless recorders. Our customers are industrial end users and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. They work in oil and gas, water and wastewater, chemical, food and beverage, and marine industries. Most are small and medium enterprises with 10 to 100 employees. We also run flow-meter.com.au for the Australian market. Our technical stack is Laravel with Filament v3 for the backend, and we use TipTap rich text editor. We write in the Source Code mode to paste HTML directly. --- ## Why Oval Gear Flow Meter for Diesel? Diesel is a medium viscosity liquid. Its viscosity ranges from 2 to 4.5 cP at 40°C. For flow measurement, this creates a problem. Many flow meter types struggle with diesel. An oval gear meter solves it. Here’s the thing. Magnetic flow meters need conductivity. Diesel has very low conductivity. Ultrasonic meters work but cost more and need lubricating oil flow meter DN25

straight pipe runs. Vortex meters need higher flow velocity to function. Coriolis meters are accurate but expensive for bulk diesel applications. Oval gear flow meters use positive displacement. Two oval gears rotate inside the chamber. Each rotation traps a fixed volume of liquid. The meter counts the rotations to calculate total flow. This design is mechanical and does not depend on liquid properties like conductivity or density. We have seen this on customer sites many times. Last year a customer in Malaysia installed our oval gear meter for diesel barge refueling. Their diesel had viscosity of 3.2 cP. The meter achieved ±0.5% accuracy across the flow range from 2 to 30 L/min. No recalibration needed after six months. --- ## Key Technical Specifications ### Accuracy and Flow Range The typical accuracy for oval gear diesel meters is ±0.5% of reading. Some models achieve ±0.2% with calibration. The turndown ratio is usually 10:1 to 20:1. For diesel applications, the flow range depends on meter size. | Meter Size (DN) | Minimum Flow (L/min) | Maximum Flow (L/min) | |-----------------|----------------------|----------------------| | DN15 | 0.5 | 10 | | DN20 | 1 | 25 | | DN25 | 2 | 60 | | DN40 | 5 | 120 | | DN50 | 10 | 200 | | DN80 | 20 | 500 | These values change with diesel temperature and viscosity. Higher temperature means lower viscosity and slightly less slippage. But the effect is small. For a diesel application with 3 cP, the perfo

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