Knowledge in the field of flow calibration

A UVC is normally created for turbine flow meters when they are to be operated at different viscosities of the liquid medium, e.g., due to different medium temperatures. The UVC determined during calibration is used to calculate the volume flow of the turbine under all conditions within the calibrated viscosity range. This curve is usually stored in the turbine's evaluation unit after calibration. 

This allows turbines to be operated very accurately and reliably at varying medium temperatures. To create a UVC, the turbine is normally calibrated at three viscosities.

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The flow of liquids and gases can be measured in our calibration laboratories. We offer water, methanol, and oils with different viscosities as standard liquid calibration media. Gaseous calibration media include dry air, argon, helium, carbon dioxide, and nitrogen. 

Flow meters that measure the flow of liquids or gases in pipes can be calibrated. However, we cannot calibrate flow meters that measure the flow of liquids in an open channel or flume. 

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• Magnetic-inductive flow meter (MID)
• Coriolis flow meter
• Float flow meter
• Vortex flow meter
• Turbine flow meter
• Gear or oval wheel flow meter
• Spindle flow meter
• Ultrasonic flow meter 

• Thermal mass flow meters
• Floating body flow meters
• Vortex flow meters
• Differential pressure flow meters
• Bellows and rotary piston gas meters
• Turbine flow meters
• Ultrasonic flow meters  

Volumetric flow measurement determines how much volume of a fluid (e.g., water, oil, air) flows through a pipe per unit of time. Typical units are l/min or m³/h. It is one of the most important measurement methods in industry, water technology, and building services engineering. 

Of course, both the time and volume units can be adjusted as desired, e.g., l/h, cm³/s, etc. 

The key advantage of mass or standard volume flow measurement when calibrating gases is that the measurement remains independent of pressure and temperature changes that occur, for example, due to changes in pipe diameter. This provides reproducible, comparable, and precise calibration results—something that would not be possible with pure volume measurement under operating conditions because gases are highly compressible.  

This requires the density of the medium. The conversion formula is: Mass flow = volume flow * density.  

For dry air, for example, a volume flow of 20 l/min measured under standard conditions (0 °C, 1013.25 mbar) corresponds to a mass flow of 25.86 g/min, since the standard density is approximately 1.293 g/l.  

 In many cases, the corresponding measuring range can be found on the type plate.  

The flow rate is often indicated by “Q” or “q.” 

 Viscosity describes the thickness of a medium—the higher it is, the thicker it is. Viscosity is temperature dependent. The viscosity of liquids decreases as the temperature rises—the liquid becomes thinner. In contrast, the viscosity of gases increases as the temperature rises.

In displacement meters, such as gear, oval wheel, or turbine flow meters, the viscosity of the flowing liquid influences the flow rate. Therefore, it is very important to know the desired viscosity of the calibration liquid for customer-specific calibration of these flow meters.  

A flow meter measures the volume or mass flow of gases or liquids flowing through a pipe. These devices are indispensable in measurement and control technology and are used wherever precise flow values are required—for example, in HVAC technology, energy and utility plants, water management, as well as in the aerospace, agriculture, and pharmaceutical industries.

Regular calibration of flow meters is necessary to ensure consistently reliable measurement results. This ensures that the measured values are correct and comply with the accuracy and uncertainty limits defined by the manufacturer.

Even with high-quality measuring devices, significant measurement deviations can occur over time. This can be caused by contamination of the measuring medium, mechanical stress, process fluctuations, or incorrect installation, among other things. In addition, material wear, corrosion, or technical defects also impair measurement accuracy. 

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