Challenge

The Siemens PS2 digital positioner provides accurate, repeatable control. This device replaced both the analogue I/P and the pneumatic positioner, streamlining the control circuit and eradicating the components that were “drifting.” The PS2 unit also provides positive feedback indication at the control room.

Another challenging aspect to this particular project was the location of the measuring point which was positioned 3 meters directly below the ceiling from the basement to the ground floor. Furthermore, numerous pumps were installed below the measurement point, which posed a particular challenge for a 1:1 replacement of an electromagnetic flowmeter (weighing about 500 kg). For this reason the association selected a clamp-on flow measurement solution to help alleviate these issues.

Solution

To replace the defective electromagnetic flowmeter a Siemens SITRANS FS230 clamp-on ultrasonic flowmeter was installed, helpfully this was a swift process which only took a matter of minutes. This impressive flowmeter has an accuracy of 0.5 to 1% of flow rate and repeatability of 0.25% according to ISO 11631. Furthermore, with a 100 Hz data update rate even the miniscule and high-speed fluctuations in flow are detected with exceptional precision.

Result

Included in the SITRANS FS240 is a Digital Sensor Link which digitises the signal at the initial point of measurement for a strong signal-to-noise ratio and high-precision measurement. All changes can be tracked at any time on the display with up to six customisable views. Clampon systems in general can be mounted easily on the outside of the pipe, meaning a quick and straightforward installation.

The newly fitted SITRANS FS230 clamp-on is far more cost-effective than the previous defective flowmeter which was far outdated.

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