FEP630, FEH630
ELECTROMAGNETIC FLOWMETER | OI/FEP630/FEH630-EN REV. D
123
Sensor
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 129.
Gaskets
Some device designs are shipped with special gaskets. These
gaskets must be used and installed properly to prevent leakage
and guarantee 3A and EHEDG conformity.
For all other device designs, use commercially available gaskets
made from a compatible material for the measuring medium and
prevailing temperature (rubber, PTFE, lt, EPDM, silicon, Viton,
etc.) or use 3A-compliant gasket material for HygienicMaster
devices.
A wafer type sensor is installed without gaskets directly in the
pipeline.
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.
11
Repair
Safety instructions
DANGER
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.
WARNING
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.
WARNING
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.
CAUTION
Risk of burns due to hot measuring media
The device surface temperature may exceed 70 °C (158 °F),
depending on the measuring medium temperature!
• Before starting work on the device, make sure that it has
cooled sufficiently.
NOTICE
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.
