11 Maintenance; Safety Instructions; Sensor; Cleaning - ABB CoriolisMaster FCH400 Series Operating Instructions Manual

138 CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E

11 Maintenance

Safety instructions

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.
See also Use in potentially explosive atmospheres on
page 6.
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.

Sensor

The flowmeter essentially requires no maintenance.
The following items should be checked annually:
• Ambient conditions (air circulation, humidity),
• Tightness of the process connections,
• Cable entries and cover screws,
• Operational reliability of the power supply, lightning
protection, and station ground.
Repairs to the flowmeter
If repairs to the flowmeter are required, observe Repair on
page 138.

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.

12 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.
See also Use in potentially explosive atmospheres on
page 6.
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.