Product Analysis: Kobold VKM 31-02-U8-N08-0-L
The Kobold VKM 31-02-U8-N08-0-L is a high-performance flowmeter and switch designed for media with varying viscosities. Unlike standard flowmeters that lose accuracy when the fluid thickness changes, the VKM series utilizes a unique viscosity compensation system. This ensures consistent measurement accuracy (±4% of full scale) even as the viscosity of the oil or liquid changes from 1 to 540 mm²/s, making it the premier choice for hydraulic systems and lubrication circuits.
Mechanical Design and Compensation Principle
This model uses a spring-loaded float that moves within a cylindrical measuring tube. The float features an integral orifice that compensates for viscosity effects. The 31-02-U8-N08 configuration specifies a measuring range of 2.0 to 7.5 l/min and a 1/2″ NPT process connection. The unit provides a reed contact for switching and can be equipped with a local pointer display for visual monitoring. Its all-metal construction allows for operation in high-pressure environments up to 350 bar.
Key Technical Characteristics
- Part Number: VKM 31-02-U8-N08-0-L.
- Measuring Range: 2.0 – 7.5 l/min (Oil).
- Viscosity Range: 1…540 mm²/s.
- Process Connection: 1/2″ NPT (N08).
- Max Pressure: 350 bar.
- Contact: bistable reed contact (U8 designation).
- Material: Brass or Stainless Steel (Ref. variant).
- Max Temperature: 100°C.
Operational Benefits
The VKM series is widely used in central lubrication systems where oil viscosity fluctuates significantly with temperature changes. Its robust mechanical design is resistant to contamination and is nearly independent of mounting position, although vertical installation is recommended for maximum accuracy. The «0-L» suffix indicates specific orientation or contact logic options optimized for high-reliability industrial monitoring.
| Feature | Detail |
| Repeatability | ≤ 1% |
| Protection | IP65 (Contact) |
| Standard Calibration | Oil at 105 mm²/s |
Maintenance Insights
The VKM 31-02 is designed for «fit and forget» reliability. However, in systems with high metallic particulate counts, the use of a magnetic filter upstream is recommended to protect the internal float. The reed contact can be easily replaced or adjusted along the outside of the housing without breaking the pressure boundary.
¿Necesita más referencias de esta marca? Explore nuestro catálogo completo de Kobold aquí.
