Oval Gear Diesel Flow Meter Supplier in Bangladesh
Digital oval gear flow meter for diesel, oil and other liquids, from DN8 to DN200, supplied with installation and after-sales support by Techno Bangla Creation.
What Is an Oval Gear Flow Meter?
An oval gear flow meter is a positive-displacement meter for liquids such as diesel, oil and chemicals. Two meshing oval gears turn as liquid passes through, and each turn moves a fixed volume. The electronics count the turns and show flow rate and total volume. It works best on clean liquids, with a strainer ahead of the meter.
It is not a turbine or Coriolis meter. A turbine meter counts a spinning rotor, and a Coriolis meter reads mass from vibrating tubes. For steam and air lines see our vortex flow meter, and for gas see our thermal gas flow meter.
- Positive-displacement design that measures volume directly
- Line sizes from DN8 to DN200 (about 1/4 to 8 inch)
- Pulse, 4-20 mA and RS485 outputs on 24 V DC
- Installation and after-sales support in Bangladesh
Oval Gear Flow Meter Specifications
- Type
- Oval gear (positive displacement) flow meter
- Medium
- Diesel, oil and other liquids
- Line Size
- DN8 ~ DN200 (about 1/4 ~ 8 inch)
- Pressure
- Up to 1.6 MPa (16 bar, about 232 psi)
- Temperature
- Up to 250 °C as listed (about 482 °F)
- Accuracy
- ±0.2% ~ ±0.5% as listed
- Sensor Material
- Cast iron, cast steel, stainless steel
- Signal Output
- Pulse, DC 4-20 mA, RS485
- Power Supply
- 24 V DC
- Brand
- Smart Measurement Co, Ltd, TECHANGE
- Origin
- USA, China
Accuracy grade, viscosity limit, flow range per size, display type and hazardous-area rating depend on the model. Send your duty point and our engineers will confirm them on the datasheet.
Oval Gear vs Turbine and Coriolis Flow Meters for Diesel
All three can meter fuel. They differ in cost, viscosity tolerance and what they need from the line.
| Feature | Oval Gear | Turbine | Coriolis |
|---|---|---|---|
| Principle | Two oval gears pass a fixed volume per turn | Spinning rotor counted by a pickup | Vibrating tubes measure mass |
| Output | Volume | Volume | Direct mass flow |
| Low-flow accuracy | Steady. Error stayed under ±0.5% in one diesel-like oil test | Bearing friction can add error. About -4.3% at 60 L/h in the same test | Lowest error in that test, under 0.1% |
| Viscosity | Wide range, from thin diesel to thick oils | Less tolerant of viscosity changes | Handled large viscosity swings in a published fuel test |
| Clean fluid needed | Yes. Strainer ahead of the meter | Best with clean refined fuels | Copes with more complex fluids |
| Straight pipe run | Typically none needed | Check the datasheet | Check the datasheet |
| Moving parts | Two oval gears | Rotor and bearings | No rotating parts |
| Cost | Lower | Moderate | Significantly higher |
| Best fit | Diesel gensets, boilers, tank transfer, dispensing | Clean, thin fuel lines in small to mid pipes | Mass flow accuracy where budget allows |
Low-flow figures come from one laboratory test of ship fuel meters using diesel-like oil. Real results depend on the model and installation, so confirm against the datasheet.
How Does an Oval Gear Flow Meter Work?
- Liquid Enters the MeterDiesel flows in through the inlet and fills the measuring chamber.
- Pressure Turns the GearsThe pressure difference between inlet and outlet turns a pair of meshing oval gears.
- Each Turn Moves a Fixed VolumeEvery revolution pushes out a known volume, so the count equals the volume that passed.
- Sensor Counts the RotationsA sensor turns each rotation into an electrical pulse.
- Converter Shows Flow and TotalThe converter shows flow rate and total volume, and sends pulse, 4-20 mA or RS485 signals to your system.
Why Use an Oval Gear Flow Meter for Diesel?
Figures come from manufacturer and engineering references. Confirm them for your model.
- Measures volume directly, so totals do not depend on flow velocity or pipe profile
- Handles thin diesel and thicker oils, with accuracy usually steady across viscosity above the meter's minimum
- Typically needs no straight pipe run or flow conditioning
- Stable at low flow, with error under ±0.5% in one diesel-like oil test
- Listed accuracy of ±0.2% to ±0.5%, with small pressure loss
- Pulse, 4-20 mA and RS485 outputs for PLC, logger or fuel management systems
Is an Oval Gear Meter Right for Your Fuel Line?
Choose an Oval Gear Meter When
- The fuel is clean or can be strained before the meter
- You need accurate litre totals for diesel, oil or similar liquids
- Viscosity changes with temperature or fuel grade
- Flow is low or intermittent
- There is little straight pipe space
Choose Another Meter When
- The liquid carries solids or cannot be filtered
- You need direct mass flow, which a Coriolis meter gives
- The liquid is thin and water-like, below the meter's minimum viscosity
- The pipe is very large, where other technologies often fit better
- The line carries conductive water. See our electromagnetic flow meter
Where Are Oval Gear Flow Meters Used?
Any clean liquid line where you need accurate litre totals. For chemical batching, see our chemical dosing pumps.
- Diesel Generator Fuel
- Boiler and Furnace Fuel Feed
- Bulk Diesel Transfer
- Tanker Loading and Unloading
- Fleet and Workshop Dispensing
- Lube and Hydraulic Oil
- Chemicals and Solvents
- Batching and Blending
How to Choose an Oval Gear Flow Meter
Share these details with our engineers and we will recommend a suitable size and model.
- Fluid and viscosity. State diesel, oil or chemical, with temperature. Road diesel is typically about 2.0 to 4.5 cSt at 40 °C, and viscosity rises as fuel cools. Confirm the meter's minimum viscosity.
- Flow range and size. Select size from minimum and maximum flow, not pipe size. An undersized meter adds pressure loss and wear, and an oversized one reads poorly at low flow.
- Strainer and air. Fit a strainer on the inlet, sized to the meter. Add an air eliminator if air in the fuel cannot be avoided, and fill the line slowly at start-up.
- Generator return line. If the engine returns fuel to the tank, meter the supply and the return and subtract, or the reading overstates consumption.
- Signal and safety. Choose pulse, 4-20 mA or RS485 for your system. For fuel depots, ask about the hazardous-area rating of the exact model.
Why Does Diesel Metering Matter in Bangladesh?
During the gas shortage reported in August 2026, factories in industrial belts such as Gazipur, Savar and Narayanganj leaned on diesel generators, which Dhaka Tribune said could double utility costs. One leather exporter reported diesel use rising 390 percent at three factories over June and July.
When fuel is that costly, estimates are not enough. Generator makers' tank-level sensors can be inaccurate on flat tanks, while a flow meter shows litres used per engine. One vendor case reported about 15 percent lower consumption after monitoring. Results vary by site.
Installation and After-Sales Support
Techno Bangla Creation supplies flow meters, treatment plant equipment and technical support to factories across Bangladesh. Send your fluid, flow range, line size and pressure and our engineers will confirm a suitable oval gear meter and the strainer and piping it needs.
See our full range of flow meters, or the ETP plant page for complete plant solutions.
Frequently Asked Questions
What is an oval gear flow meter?
An oval gear flow meter is a positive-displacement meter for liquids such as diesel, oil and chemicals. Two meshing oval gears turn as liquid passes through, and each turn moves a fixed volume. The electronics count the turns and show flow rate and total volume. It works best on clean liquids, with a strainer ahead of the meter.
How does an oval gear flow meter measure diesel flow?
Pressure from the flowing diesel turns a pair of oval gears inside a sealed chamber. Each rotation passes a known volume, and a sensor counts the rotations as pulses. The converter turns those pulses into litres per hour and total litres. Because it counts volume directly, it does not depend on fuel velocity or flow profile.
What is the difference between an oval gear and a turbine flow meter for diesel?
Oval gear meters are positive-displacement meters that count fixed volumes, so they stay steady at low flow and handle viscosity changes well. Turbine meters suit clean, thin fuels, but bearing friction can add error at low flow. In one laboratory test on diesel-like oil, a turbine read about 4.3% low at 60 L/h while a positive-displacement meter stayed within ±0.5%.
What accuracy, size and pressure range do you supply?
Our listed oval gear meter covers DN8 to DN200 (about 1/4 to 8 inch), pressure up to 1.6 MPa (16 bar, about 232 psi) and accuracy of ±0.2% to ±0.5%, with cast iron, cast steel or stainless steel sensor bodies. Pulse, 4-20 mA and RS485 outputs run on 24 V DC. Exact limits depend on the model, so we confirm them against your duty.
Does an oval gear flow meter need a filter or strainer?
Yes. Oval gears run with tight clearances, so hard particles cause abrasion and wear. Install a strainer on the inlet, with mesh sized to the meter, and add an air eliminator if air in the fuel cannot be avoided. Clean the strainer regularly, because a blocked strainer upsets readings. Fill the line slowly at start-up.
Can an oval gear flow meter measure generator fuel consumption?
Yes, with the right piping. A meter on the supply line gives litres used, but many engines return surplus fuel to the tank. In that case meter the return line too and subtract it, or the reading overstates consumption. Share your generator model and fuel line layout so our engineers can plan the setup.
When should I not use an oval gear flow meter?
Avoid it when the liquid carries solids or cannot be filtered, when you need direct mass flow, or when viscosity falls below the meter's stated minimum, because accuracy suffers there. Very large pipes are often better served by other technologies. A Coriolis meter suits mass flow, and an electromagnetic meter suits conductive water lines.
How much does an oval gear diesel flow meter cost in Bangladesh?
Price depends on line size, sensor material, accuracy grade, output type and display, so one figure would mislead. A small DN8 unit and a DN200 flanged unit differ widely. Send your fluid, flow range, line size and pressure to our engineers by phone or email and we reply with a free quotation.
