Venturi Tube
Using the Venturi effect, JACOB's Venturi tube enables precise measurement of the volume or mass flow in industrial applications in accordance with DIN EN ISO 5167. By integrating the Venturi tube into a measurement and control system, the air flow volume can be precisely determined, monitored and continuously controlled. The Venturi tube is an energy-efficient and space-saving solution due to the pressure loss and short inlet distances.
Versions:
- Complete package: Venturi tube (incl. bracket) with screwed-on measuring unit, with hose joint on the tube and pre-installed K-factor
- Standard version: Venturi tube (incl. bracket)
Your advantages at a glance:
- Short inlet sections compared to other differential pressure transducers
- Low pressure losses due to design
- Suitable measuring method even with aggressive media
- Optimum volume flow measurement through precise differential pressure measurement
- Can be used in clean or polluted air flows
- Simple integration into the JACOB tubing system
Application and installation instructions:
The Venturi tube should be selected according to the size of the tubing system in which it is to be installed. The pressure loss can be estimated using the graph provided. If the pressure loss is too high or the flow velocity too high, it is advisable to select a larger nominal diameter (DN). Optional tubes can be used to produce the recommended minimum inlet length of 5 x DN (see DIN EN ISO 5167-4 Tab. 1 for specific installation disturbances and inlet sections).
Volume flow calculation:
The volume flow V̇ is given by the equation:
calculated, whereby:
- V̇ is the volume flow,
- K is the flow factor, depending on geometry and operating conditions,
- Pw is the effective differential pressure.
The electronic measuring unit of the Venturi tube determines the volume flow based on the equation. The flow factor is multiplied by the root-extracted differential pressure. The flow factor depends on the geometry and operating conditions. In the complete package, the K-factor for the respective size is determined at 14.7 psi ambient pressure and 68 °F and pre-installed in the measuring unit. If the operating conditions are very different, please contact us to adjust the K-factor accordingly.
Measuring tolerances and measuring unit:
Without adjustment, deviations of ± 5-10 % from the actual volume flow can occur. These result from manufacturing tolerances, varying operating conditions and the pressure scaling in the measuring unit. The following measuring ranges are available for differential pressure measurement:
| DS200-P2 | 0…200 Pa | 0…150 Pa | 0...100 Pa | 0…50 Pa |
| DS200-P10 | 0…1000 Pa | 0…500 Pa | 0…300 Pa | 0…200 Pa |
| DS200-P60 | 0…6000 Pa | 0…4000 Pa | 0…3000 Pa | 0…2000 Pa |
In order to achieve measurements with minimum tolerance, the measuring range should be adapted to the differential pressure. Further information can be found in the operating and installation instructions for the DS200 differential pressure sensor (see download area).
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