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gasoline flow meter DN15
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# Oval Gear Flow Meter for Diesel: Accurate Fuel Measurement for Generators and Engines
**Quick Answer:** Oval gear flow meters measure diesel fuel flow rate by trapping fixed volumes in rotating gears. They work with high-viscosity fluids like diesel at temperatures up to 120°C and pressures up to 100 bar. Typical accuracy is ±0.5% of reading for flow ranges from 0.5 L/h to 60,000 L/h. If you need to monitor fuel consumption on a diesel generator set (genset), marine engine, or boiler, this meter type is a solid choice. To get a quote, send us your flow range (L/h or kg/h), fuel temperature (°C), viscosity (cP), and pipe size (DN).
## What Is an Oval Gear Flow Meter?
An oval gear flow meter is a positive displacement meter. It uses two interlocking oval-shaped gears that rotate inside a chamber. Fluid entering the meter pushes the gears to turn, and each rotation traps a precise volume of liquid. A pickup sensor (usually a magnetic or Hall effect type) counts the gear rotations and sends a pulse signal to a display or PLC. For diesel, this pulse rate directly correlates to volume or mass flow.
The key parts are:
- Oval gears (hardened steel or stainless steel)
- Measuring chamber (precision machined)
- Magnetic sensor or Hall sensor
- Threaded or flanged connections (BSP, NPT, DN)
## Why Use Oval Gear Meters for Diesel?
Diesel has a viscosity of roughly 2–5 cP at typical temperatures. That is thicker than water but not as thick as heavy fuel oil. Oval gear meters handle this viscosity range well because the positive displacement principle does not rely on the fluids velocity profile like turbine meters do.
These meters are common on:
- Diesel generator fuel supply lines
- Marine auxiliary engine fuel systems
- Ag
ricultural irrigation pump fuel monitoring
- Forklift and heavy equipment fuel dispensing
- Boiler fuel consumption tracking
A customer in Vietnam last year installed our OGM model on a 500 kVA diesel generator set at a garment factory. They needed to verify fuel consumption for cost allocation across three production shifts. The meter ran for 18 months without calibration drift. The only maintenance was a gear cleaning after they accidentally ran with a contaminated batch of fuel that had water and sediment.
## Key Specifications for Diesel Measurement
For a standard oval gear flow meter for diesel:
| Parameter | Typical Range |
|-----------|---------------|
| Flow range | 0.5 – 60,000 L/h depending on size |
| Accuracy | ±0.5% of reading (standard) |
| Repeatability | ±0.05% |
| Viscosity range | 0.5 – 1,000,000 cP |
| Temperature | -20°C to +120°C (standard) |
| Pressure rating | Up to 100 bar (DN15–DN50) |
| Sensor output | 4-20 mA, pulse, Modbus RTU |
| Materials | SS304, SS316, PTFE lining |
| Connection | BSP, NPT, flanged (DN10–DN100) |
Most engineers skip this part: you must match the meter size to your actual flow range, not just pipe diameter. A DN40 pipe might be fine for the installation, but if your diesel flow is only 50 L/h, you need a DN15 meter. Oversizing causes the gears to spin too slowly. The pulses become unreliable at low flow.
## Installation Tips for Diesel Fuel
Diesel fuel systems often have pulsation from the transfer pump. You should install a flow straightener or a 10-pipe-diameter straight run upstream. But here is the thing: with oval gear meters, you do not need as much straight pipe as turbine or ultrasonic meters. The meter itself conditions the flow by its positive displacement 『SILVER Official Website SERVICE』
User:flowinstrumentsa3d3dLast Time:07/24/2026
