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| | | © Siemens AG 2007 | | |
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| | | SITRANS F flowmeters SITRANS F M | | |
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| | | ransmitter MAGFLO MAG 5000/600 | | |
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| | | Mode of operation The cleaning unit cleans the electrodes electro-chemically by applying a voltage to the electrodes for approx. 60 seconds. While cleaning, the industrial transmitter stores and holds the latest measured flow reading on the display and also the signal outputs. After an additional pausing period of 60 seconds the flowmeter resumes normal measurement and the cleaning is now completed. The relay in the transmitter activates the cleaning cycle. In the relay output menu (under cleaning) the cleaning interval can be set between 1 hour and 24 hours. | | |
| | | Cleaning should only take place with liquid in the professional pipe.This can be detected via the empty pipe function. It is therefore recommended to select "empty pipe detection" ON when using the cleaning. The cleaning sequence can also be controlled manually through the electrical input of the transmitter. Before this is done, ensure that the measuring pipe is full. | | |
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| | | AC cleaning | | |
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| | | AC-cleaning is used to remove fatty deposits on the electrodes. These fatty deposits are seen in waste water applications, in abattoirs and water applications with oil residuals. During the cleaning process, the surface of the electrodes get warmer, which tends to soften professional grease particles and the gas bubbles generated mechanically lift deposits away from the surface of the electrodes. | | |
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| | | DC cleaning | | |
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| | | DC-cleaning is used to eliminate electrically conductive deposits in the measuring pipe influencing the measuring accuracy. Particularly in district heating applications an electrically conductive deposit (magnetite) may occur and short-circuit the industrial electrode signal. In this case the accuracy of the meter decreases and the signal/noise conditions of the meter become inferior. The problem only arises if the conductivity of the water is less than approx. 250 u.S/cm. During DC-cleaning electrolysis takes place where the flow of electrons removes the particle deposits from the electrode area. Note: Do not use DC-cleaning on sensors with Tantalum or Hastelloy electrodes. | | |
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| | | Siemens FI 01 • 2008 | | |
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