Product Analysis: Kobold DON-2 Oval Gear Flow Meter
The Kobold DON-2-25H P6-5-H0-M-0 is a high-precision positive displacement flowmeter designed specifically for measuring the flow of viscous liquids. Part of the legendary DON series, this oval gear meter is the industry standard for measuring oils, lubricants, fuels, and chemical additives. Unlike other flow technologies, oval gear meters excel at measuring media with varying viscosities, providing exceptional accuracy and repeatability even under fluctuating process conditions.
Oval Gear Principle and Construction
The measurement principle is based on two precision-intermeshed oval gears that are rotated by the flowing medium. Each revolution represents a fixed volume of liquid, which is then translated into an electrical signal. The «P6» designation refers to the robust stainless steel housing, while the «25H» indicates a specific high-pressure rating or flow range capability. This model is engineered to provide a high-resolution pulse output (H0) for precise batching and dosing applications in industrial lubrication systems and oil processing plants.
Key Technical Characteristics
- Part Number: DON-2-25H P6-5-H0-M-0.
- Type: Oval Gear (Positive Displacement).
- Housing Material: Stainless steel 316L (P6).
- Viscosity Range: Up to 1,000,000 cP (with specific gears).
- Connection: G 1 (Ref. ‘M’ designation).
- Output: Pulse output (Reed/Hall effect).
- Max Pressure: High-pressure variant (Ref. 25H).
- Accuracy: ± 0.5% of reading.
Advanced Performance and Accuracy
The DON-2 series is renowned for its linear accuracy across the entire flow range. Because it is a positive displacement meter, it does not require straight pipe runs for installation, allowing it to be used in very compact machine layouts. The stainless steel gears and housing provide excellent wear resistance and chemical compatibility, ensuring long-term stability even with slightly abrasive or corrosive viscous fluids.
| Feature | Detail |
| Repeatability | ± 0.03% |
| Protection Rating | IP66/67 |
| Operating Temp | -20°C to +120°C |
Technical Note
To ensure the longevity of the DON-2, the installation of a 100-micron strainer upstream is mandatory. This prevents large particulates from entering the gear chamber and causing a mechanical jam. The unit is factory-calibrated for oil, and the pulse value (K-factor) is clearly marked on the calibration certificate for easy PLC programming.
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