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FEM630 | ELECTROMAGNETIC FLOWMETER | OI/FEM630-EN REV. A
11 Repair...10 Maintenance
Safety instructionsSensor
The flowmeter sensor is largely maintenance-free.
The following items should be checked annually:
• Ambient conditions (air circulation, humidity).
• Tightness of the process connections.
• Cable entries, cover gaskets and cover screws.
• Operational reliability of power supply, lightning
protection and grounding.
The sensor electrodes must be cleaned when the flow rate
information on the transmitter changes while recording the
identical flow rate volume.
If the display shows a higher flowrate, the contamination is
insulating. If a lower flowrate is displayed, the
contamination results in a short-circuit.
For repairs to the liner, electrodes or magnet coil, the
flowmeter must be returned to the manufacturer.
See Returning devices on page 128.
Cleaning
When cleaning the exterior of meters, make sure that the
cleaning agent used does not corrode the housing surface
and the seals.
To avoid static charge, a damp cloth must be used for
cleaning.
WARNING
WARNING
Risk of burns due to hot measuring media
temperature!
• Before starting work on the device, make sure that it
has cooled sufficiently.
Damage to components!
The electronic components of the printed circuit board
can be damaged by static electricity (observe ESD
guidelines).
• Make sure that the static electricity in your body is
discharged before touching electronic components.
CAUT ION
NOTICE
Risk of injury due to live parts!
When the housing is open, contact protection is not
provided and EMC protection is limited.
• Before opening the housing, switch off the power
supply.
Loss of Ex-approval!
Loss of Ex approval due to replacement of components
in devices for use in potentially explosive atmospheres.
• Devices for use in potentially explosive atmospheres
may be serviced and repaired by qualified ABB
personnel only.
• For measuring devices for potentially explosive
atmospheres, observe the relevant operator
guidelines.
Danger of explosion if the device is operated with the
transmitter housing or terminal box open!
While using the device in potentially explosive
atmospheres before opening the transmitter housing or
the terminal box, note the following points:
• A valid fire permit must be present.
• Make sure that no flammable or hazardous
atmospheres are present.
DANGER
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