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# Oval Gear Flow Meter for Diesel: Specifications, Accuracy, and Buying Guide
**Quick Answer:** An oval gear flow meter measures diesel volume with ±0.5% accuracy, suitable for flow rates from 0.5 to 200 L/min and viscosities from 1 to 1000 cP. You need a meter with 4-20 mA HART output, ATEX Zone 1 certification, and DN15 to DN50 connections for diesel transfer or batching. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range for a quote.
## How Oval Gear Flow Meters Work for Diesel
Oval gear meters use two rotating oval gears inside a chamber. Diesel enters, pushes the gears, and each rotation equals a fixed volume. Simple design. No electronics inside the chamber. The magnetic pickup or reed switch reads the movement and sends pulses to a flow computer.
This is why oval gear meters work well for diesel. Diesel has lubrication properties that keep the gears moving smoothly. It is not abrasive like sand-laden water. The gears maintain tight clearance, so leakage is minimal even at low flow.
## Key Specifications for Diesel Measurement
The table below shows typical oval gear flow meter specifications for diesel applications:
| Parameter | Range | Notes |
|-----------|-------|-------|
| Flow range | 0.5 to 200 L/min | Depends on meter size |
| Accuracy | ±0.5% reading | At viscosity 10 cP or higher |
| Viscosity range | 1 to 1000 cP | Diesel is 2-4 cP at 40°C |
| Temperature | -10 to 120°C | PT100 optional |
| Pressure rating | 10 to 40 bar | PN16 or PN40 flanges |
| Output | 4-20 mA HART, pulse | Both analog and digital |
| Certification | ATEX Zone 1, Ex d IIC T4 | For hazardous areas |
## Choosing the Right Size
Meter size depends on flow rate and diesel viscosity. Here are common sizes
for diesel:
**DN15 (¼ inch):** 0.5 to 10 L/min. Typically for small diesel generators or lab testing. Last year a customer in Vietnam used this for fuel injection testing at a marine engine repair facility.
**DN25 (1 inch):** 0.6 to 60 L/min. For truck fueling stations and medium diesel tanks. Most engineers skip this part: diesel at low temperature (below 5°C) has higher viscosity, so you need slightly larger size to maintain accuracy.
**DN40 (1½ inch):** 1.2 to 120 L/min. For bulk diesel tanker loading. A paint manufacturer in Southeast Asia used this to measure diesel for their spray booths.
**DN50 (2 inch):** 2.0 to 200 L/min. For large flow diesel transfer, pipeline batching, or marine bunkering.
## Accuracy vs Flow Rate
Oval gear meters give best accuracy at 10 to 100% of rated flow. Below 10%, accuracy drops. Here’s what we have seen on customer sites many times:
At 0.5 L/min in a DN25 meter, error can be ±2%. At 10 L/min, error drops to ±0.5%. For diesel batching where accuracy matters, keep flow between 20% and 80% of meter range.
## Installation Tips
Install the meter with a straight pipe section before and after. At least 10 pipe diameters upstream and 5 downstream. But here is the thing: oval gear meters are less sensitive to flow profile than other types. Most engineers skip this part and still get good results.
Filters are mandatory. Diesel can contain dirt, water, or bacterial growth. Install a strainer with 50 to 100 micron mesh before the flow meter. We have seen a customer in Indonesia clog their meter three times in one month before they installed a filter.
Vertical installation works better than horizontal for diesel meters. The gears drain fully, and air bubbles escape. In horizontal pipe『SILVER Official Website SERVICE』
User:flowinstruments8997dLast Time:07/24/2026
