Product Overview: Kobold VKM31-02-U0-N08-0-L
The Kobold VKM31-02-U0-N08-0-L is a high-precision flow meter and switch designed for liquids with varying viscosities. Unlike traditional flowmeters whose accuracy fluctuates with temperature-induced viscosity changes, the VKM series uses a patented viscosity compensation system. This ensures consistent performance (±4% of full scale) for media ranging from 1 to 540 mm²/s. It is the primary choice for monitoring central lubrication systems and high-pressure hydraulic circuits.
Mechanical Design and Sensing Principle
The VKM series operates using a spring-loaded float that moves within a cylindrical measuring tube. The float features an integral orifice that compensates for the drag effects of viscous fluids. The «31-02» designation identifies a measuring range of 2.0 to 7.5 l/min, while the «N08″ refers to a 1/2» NPT process connection. This specific variant includes a «U0» contact, typically a high-reliability reed switch for point-level alarming. Its all-metal construction (Brass or Stainless Steel) allows it to operate in extreme pressure environments up to 350 bar.
Key Technical Characteristics
- Part Number: VKM31-02-U0-N08-0-L.
- Measuring Range: 2.0 – 7.5 l/min (Oil).
- Viscosity Compensation: 1…540 mm²/s.
- Process Connection: 1/2″ NPT (N08).
- Max Operating Pressure: 350 bar (Brass/St. Steel).
- Max Medium Temperature: 100°C.
- Contact Type: Bistable reed contact.
- Protection Rating: IP65.
Operational Benefits
Because the VKM series is independent of viscosity fluctuations, it eliminates the need for recalibration when oil temperature changes during machine startup. The «0-L» suffix indicates specific orientation or contact logic options optimized for high-reliability industrial monitoring. Its robust mechanical design is resistant to contamination and offers a low pressure drop, making it ideal for the protection of expensive bearings and hydraulic actuators.
| Feature | Detail |
| Repeatability | ≤ 1% |
| Mounting Position | Any (Vertical recommended) |
| Accuracy Grade | ±4% of full scale |
Frequently Asked Questions
Does it require straight pipe runs? No, the VKM principle is largely independent of flow profile. Can it be used for water? While optimized for oil, it can measure water; however, the density difference must be factored into the flow scale.
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