Oval Gear Diesel Flow Meter Supplier in Bangladesh
Digital oval gear flow meters that count every litre of diesel, oil and other clean liquids, from DN8 to DN200, with pulse, 4-20 mA and RS485 outputs. Supplied with installation and after-sales support by Techno Bangla Creation.
What Is an Oval Gear Flow Meter?
An oval gear diesel flow meter is a positive-displacement meter. Two meshing oval gears turn as diesel passes, each turn moves a fixed volume, and the electronics count the turns to show flow rate and total litres. It suits clean fuel and oil lines, needs a strainer ahead of it, and typically needs no straight pipe run. Techno Bangla Creation supplies oval gear meters in Bangladesh with pulse, 4-20 mA and RS485 outputs.
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.
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.
Frequently Asked Questions
SmartMeasurement or TECHANGE: which oval gear meter should I choose?
Both use the same oval-gear principle. They differ in size range, pressure and temperature rating, accuracy options, outputs and display. The USA-brand ALOVPD range is published up to 250 mm and 60 bar, with +/-0.5% standard and +/-0.2% optional accuracy. The China-made TECHANGE line is listed from DN8 to DN200 at up to 16 bar. Tell us your fluid, flow range, line size and pressure and we will recommend the model.
What does 1% meter error cost on a diesel line?
Multiply monthly litres by the error and by the price per litre. At a round Tk 100 per litre, 50,000 litres a month with a 1% error is 500 litres, or about Tk 50,000 a month. Diesel in Bangladesh is priced by a formula that moves with global prices, so use today's price for your own sum. This is why a +/-0.2% to +/-0.5% meter pays for itself on heavy fuel users.
Mechanical counter or electronic oval gear meter: which should I buy?
A mechanical counter shows litres on the meter itself, needs no power and is cheaper, which suits a tank-filling point. An electronic meter adds pulse, 4-20 mA or RS485 outputs so a PLC, logger or fuel management system can record every litre, which suits generators, boilers and fleets. Do not compare prices across the two types, because a mechanical meter and an electronic transmitter unit of the same size can differ widely.
What happens if air gets into the diesel line?
An oval gear meter counts volume passing, and it cannot tell air from fuel, so air makes it over-read. The usual causes are a tank run low, a leaking suction joint or a line drained during service. Fit an air eliminator upstream, fill the line slowly after maintenance and keep the suction side tight.
Can an oval gear meter handle heavy fuel oil, lube oil or hot oil?
Often yes, within the meter's viscosity and temperature limits. Published oval gear ranges reach about 1000 cP, and viscosity changes little affect accuracy once above the meter's minimum. Cold heavy oil may need a heated line, and very thin liquids below the minimum viscosity lose accuracy. Tell us the oil, its viscosity at line temperature and its maximum temperature so we can confirm the model.
Do I need a bypass, and what valves should I avoid?
Yes, a bypass and isolation valves let you service the strainer and meter without shutting the plant down. Avoid fast-closing valves that cause a hydraulic shock, and keep control valves downstream of the meter so the gears are not forced to run dry or over-speed. Flush the line before installing the meter, because weld slag damages the gears.
How do I check or calibrate an oval gear meter?
Compare the meter's total against a known volume, using a calibrated proving can, a master meter or a weighed tank. Check after the strainer has been cleaned or the meter serviced, and again at least once a year, or more often if the meter is used for billing. Record the result so drift is easy to spot.
Can I use an oval gear meter to sell or bill fuel in Bangladesh?
Meters used to sell fuel to others are generally subject to legal-metrology verification, and in Bangladesh BSTI inspects fuel dispensers. For internal fuel monitoring at a factory, generator or depot, no such step is normally needed. If you plan to bill customers, ask BSTI what approval your setup needs, and tell us so we can recommend a suitable meter and calibration route.
