This OGM series positive displacement flow meter is a high-precision metering device specifically designed for high-viscosity media such as diesel and engine oil. The oval gear mechanical adopts the classic positive displacement measurement principle and is available in various specifications, including 1-inch, 1.5-inch, and 2-inch, with a flow range covering 20L/min to 300L/min. The PD flow meter can withstand working pressures up to 1.8MPa and liquid viscosities up to 1000CPS. Its core advantages lie in its high metering accuracy of ±0.5% and repeatability of ±0.3%. Coupled with a four-digit mechanical counter display that requires no power supply, the oval gear mechanical ensures both professional rigor in measurement and ease of installation and maintenance, making it a reliable choice for industrial oil monitoring and trade settlement.
Specification
| Model |
T-OGM-T-25 |
T-OGM-T-25 |
T-OGM-T-25 |
| Nominal Diameter |
1 inch |
1.5 inch |
2 inch |
| Minimum Flow Rate |
20 L/min |
25 L/min |
30 L/min |
| Maximum Flow Rate |
120 L/min |
250 L/min |
300 L/min |
| Accuracy |
±0.5% |
±0.5% |
±0.5% |
| Repeatability |
±0.3% |
±0.3% |
±0.3% |
| Max Viscosity |
1000 CPS |
1000 CPS |
1000 CPS |
| Max Working Pressure |
1.8 MPa |
1.8 MPa |
1.8 MPa |
| Medium |
Diesel, Petrol, Kerosene |
| Connection Type |
Threaded BSP/NPT (optional) |
| Single Count |
0.00-9999.0 |
| Total Cumulative Count |
0.00-99999.9 |
Note: To be used with an oil pump. The screen has a mechanical digital display with two rows: the upper row shows the single-batch total, which can be reset to zero, while the lower row displays the cumulative total, which cannot be reset.
Feature
- New Design & Clear Display: Featuring a professional black-silver finish and a large positive displacement flow meter dial for easy, high-contrast reading in bright light or oily conditions.
- Lightweight Aluminum Body: High-quality die-cast aluminum construction ensures impact resistance and a lightweight profile for effortless single-person installation of the oval gear mechanical flow meter.
- Durable PPS Components: Internal parts of the oval gear mechanical utilize premium PPS engineering plastic for superior chemical stability and wear resistance against diesel and gasoline.
- Smooth Oval Gear Tech: The precision oval gear structure within the PD flow meter supports up to 1.8 MPa and ensures smooth, accurate flow within a 25–250 L/min range.
- Plug-and-Play Efficiency: This battery-free PD flow meter with 1", 1.5", and 2" thread options streamlines fuel transfer and trade accounting tasks.
Detail Drawing

Application
- Construction & Mining: Mobile Fueling
Ideal for mobile service trucks in off-grid sites. This PD flow meter for oil requires no power to accurately measure diesel delivery for excavators and heavy machinery in harsh, dusty environments.
- Marine & Shipping: Fuel Bunkering
Designed for shipboard fuel management and bunkering, the positive displacement flow meter handles high-viscosity heavy oils with ease, ensuring precise fuel cost control and salt-spray resistance.
- Industrial Plants: Lubrication Systems
Perfect for factory production lines and hydraulic stations. The positive displacement flow meter monitors the distribution of lubricants and oils, using durable PPS internals to maintain stability and precision under high-pressure industrial conditions.
- Oil Depots: Transfer & Inventory
A reliable choice for internal fuel depots and oil distribution. With ±0.5% accuracy, this oval gear mechanical flow meter provides clear, battery-free readings for trade settlement and inventory checks, even during power outages.

Tips: Why does this positive displacement flow meter not require batteries or a power supply?
This is a PD flow meter. It utilizes the pressure of the fluid as it flows through to drive the internal oval gears to rotate; each revolution represents the discharge of a fixed volume of liquid. The gears directly drive the counter dials through a mechanical transmission shaft, thus relying entirely on the energy of the fluid itself to operate. It is ideal for field environments with no power supply or areas with high explosion-proof requirements.