10 Maintenance / Repair; Safety Instructions; Sensor; Gaskets - ABB FSM4000 Operating Instruction

FSM4000 ELECTROMAGNETIC FLOWMETER | OI/FSM4000-EN REV. E

10 Maintenance / Repair

Safety instructions

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.
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.
Repair and maintenance activities may only be performed by
authorized customer service personnel.
When replacing or repairing individual components, original
spare parts must be used.
NOTICE
Caution - Potential damage to parts!
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 when
touching electronic components.

Sensor

Essentially no maintenance is required for the sensor. 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.
The flowmeter sensor electrodes must be cleaned when the
flowrate information on the transmitter changes when recording
the identical flowrate volume. If the display shows a higher
flowrate, the contamination is insulating. If the flowrate
displayed is lower, the contamination results in a short-circuit.
For repairs to the lining, electrodes or magnet coil, the
flowmeter must be returned to the head office in Göttingen.
Note
When sending the sensor for repair to the head office of ABB AG,
complete the return form in the appendix and include with
device.
When cleaning the exterior of measuring devices, make sure that
the cleaning agent used does not corrode the housing surface
and the gaskets.

Gaskets

Some device designs are shipped with special gaskets. These
gaskets must be used and installed properly to prevent leakage.
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 'Hygienic Design' compliant gasket materials for
hygienic devices.
Note
A wafer type sensor is installed without gaskets directly in the
pipeline.
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