JUMO flowTRANS MAG H01, Operating Manual

Page: 174 / 260

11 Maintenance
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11.2 Sensor
The sensor is largely maintenance-free. The following items must be checked annually:
•
Environmental conditions (ventilation, moisture)
• Leak-tightness of process connections
• Cable inlets and lid screws
• Functional safety of the voltage supply, lightning protection and station ground
The sensor electrodes must be cleaned if the flow information on the transmitter changes when record-
ing the identical flow volume. If the display shows a higher flow, the contamination is insulating. If the
flow displayed is lower, the contamination results in a short-circuit.
If repairs to the lining, electrodes or magnet coils are required, the flowmeter must be returned to the
manufacturer.
When cleaning the outside of the measuring devices, make sure that the cleaning agent used does not
corrode the housing surface and the seals.
11.3 Seals
Hygienic device versions with variable process connections are supplied with special seals between the
sensor housing and the process connection. These seals must be used and installed correctly to prevent
leakage, and ensure 3A conformity.
3A-compliant mounting
 see chapter 4.3.12 "3A-compliant mounting", page 45.
3A-compliant seals  see chapter 12.4 "3A-compliant seal materials", page 180.
For all other device versions, use commercially available seals made from a material compatible with the
measurement medium and prevailing temperature (rubber, PDFE, lt, EPDM, silicone, Viton, etc.).
Sensors with a connection flange design are installed without seals directly in the pipeline.
IMPORTANT (NOTE)!
For maintaining, repairing and returning devices, the chapter chapter 1.14 "Safety information for in-
spections and maintenance", page 20 and chapter 1.15 "Returning devices", page 20 must be ob-
served!
IMPORTANT (NOTE)!
When maintaining/replacing seals on 3A-compliant hygienic devices, make sure that 3A-compliant seals
are exclusively used. The 3A-compliance of the device is not guaranteed in case of failure to comply!