Flow, level & control
which minimises the potential for bacterial growth. SAW technology also achieves this without any sensors in the flow, further decreasing the potential of biofilm development. Instead, the ultrasonic waves travel along the surface of the tube, with the sensors positioned on the external surface. The 316L stainless steel internal surface of Bürkert’s FLOWave flow meter has an average roughness (Ra) rating of <0.4 µm, making it ultra smooth. This ensures there are no microscopic pits or imperfections where biofilm can grow. The ultra smooth surface also helps FLOWave achieve CIP/SIP compatibility, and the design conforms with the necessary pharmaceutical standards, including an FDA certificate of conformity, and certification of compliance ASME BPE.
MEASUREMENT PERFORMANCE FLOWave achieves WFI loop measurement performance with accuracy at 0.4 per cent of the measurement, repeatable to 0.2 per cent deviation, ensuring that a minimum flow rate with sufficient turbulence can be maintained. SAW
Instrumentation Monthly June 2025
technology is also highly reliable and maintains repeatable accuracy thanks to its contactless sensors which do not degrade over time. Precision flow management also maximises pump efficiency by preventing unnecessarily high pump speeds that would otherwise increase energy use and cause additional pump wear. Since the ultra-pure water within a WFI has virtually no conductivity, electromagnetic meters are also rendered ineffective, while SAW technology operates irrespective of conductivity. Unlike many types of flow meter, the accuracy of SAW technology is also unaffected by bubble accumulation.
INSTALLATION AND USE For ease of operation for end users, SAW technology also requires less calibration compared to other sensor technologies. Surface Acoustic Waves are inherently stable, and as the sensors are outside the fluid path, they are less susceptible to degradation, and they are also free from mechanical wear. These advantages result in minimal deviation over time, requiring significantly
fewer recalibration intervals.
Thanks to its design simplicity, a Surface Acoustic Wave technology flow meter is also typically much lighter and smaller than an equivalent, such as a Coriolis design. This makes a flow meter like FLOWave light enough for a single engineer to install without lifting apparatus. FLOWave is also configured for practically all modern digital communication protocols, simplifying integration into an existing system. To ensure the most precise flow control within a WFI system while optimising the hygiene essential when managing ultra purified water, Surface Acoustic Wave technology flowmeters are the most effective choice today. These devices focus on the critical measurements of volumetric flow and flow velocity, and the contactless, straight tube not only enhances precision measurement, but also ensures the optimal operational conditions for WFI loop measurement and control.
Bürkert Fluid Control Systems
www.burkert.co.uk
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