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# Oval Gear Flow Meter for Diesel: Working Principle, Accuracy, and Selection Guide
## Quick Answer
The oval gear flow meter is a positive displacement meter that delivers ±0.5% accuracy for diesel fuel measurement. It works by trapping fixed volumes of fluid between two rotating oval gears, making it ideal for diesel dispensing, engine fuel monitoring, and generator fuel consumption tracking. For diesel applications, choose a meter with PTFE or Viton seals and a working pressure rating above 10 bar.
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## How an Oval Gear Flow Meter Works for Diesel
Two oval gears sit inside a precision chamber. Diesel enters the meter, creating a pressure difference that forces the gears to rotate. Each rotation traps a specific volume of diesel between the gear teeth and the chamber wall. The gear movement triggers a magnetic or mechanical pulse output, typically 4-20 mA or pulse signal.
The gear speed directly matches the flow rate. This is positive displacement measurement. There is no slip, no turbulence effect. For diesel with viscosity between 2 and 100 cP, the oval gear design maintains its accuracy. Most engineers skip this part: the clearance between gears and housing is 0.05 mm to 0.1 mm. This tight gap prevents diesel from leaking past the gears.
A paint manufacturer in Thailand uses our oval gear flow meters for diesel solvent blending. They run 8 hours per day, 50 kg/h to 200 kg/h flow range. The meters have been in service for 3 years without calibration drift.
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## Accuracy and Repeatability for Diesel Measurement
The standard accuracy for oval gear diesel meters is ±0.5% of the actual flow rate. Some models achieve ±0.2% with temperature compensation. Repeatability runs at ±0.05%.
Here is the thing. Diesel
viscosity changes with temperature. At 15°C, diesel viscosity is around 3 cP. At 40°C, it drops to 1.5 cP. Oval gear meters automatically compensate for this. Unlike turbine meters or vortex meters, oval gear meters do not need viscosity correction tables.
We tested our oval gear meter against a Coriolis master meter at a customer site in Indonesia. The customer wanted to verify diesel consumption on their tugboat engines. Over 72 hours of continuous measurement, the oval gear meter showed 0.47% deviation from the Coriolis reference. That was 23 litres difference over 4,800 litres total flow.
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## Selecting the Right Oval Gear Flow Meter for Diesel
### Material Selection
For diesel fuel, use:
- Body: Cast iron or stainless steel 304
- Gears: PPS (Polyphenylene Sulfide) or aluminum
- Seals: PTFE or Viton (resists diesel fuel degradation)
- Bearings: Tungsten carbide or ceramic
### Flow Range
| Model | Flow Range (L/min) | Min Flow | Max Flow |
|-------|--------------------|----------|----------|
| OG05 | 0.1 – 5 | 0.1 L/min | 5 L/min |
| OG10 | 0.5 – 20 | 0.5 L/min | 20 L/min |
| OG25 | 2.0 – 100 | 2.0 L/min | 100 L/min |
| OG50 | 5.0 – 200 | 5.0 L/min | 200 L/min |
For diesel generator fuel monitoring, the OG10 or OG25 covers most setups. For truck refueling stations, OG25 with high-pressure rating (up to 40 bar) is common.
### Connection Size and Pressure
Diesel systems in Southeast Asia typically use DN15 to DN50 pipe sizes. The oval gear meter connections match these: BSP female, NPT female, or flanged ANSI 150.
Pressure requirement depends on your system. Diesel fuel pumps usually operate at 3 bar to 7 bar. For high-pressure diesel injection systems, choose a meter rated for 35 bar or higher.
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User:waterflowgauge1e396Last Time:07/24/2026
