Information For Safe Operation In Potentially Explosive Atmospheres - Cfmus; Inspection; Cable Entries; Electrical Connection - ABB CoriolisMaster FCB330 Mode D'emploi

6.7 Information for safe operation in potentially explosive
atmospheres – cFMus
6.7.1

Inspection

DANGER – Risk of explosion!
Risk of explosion when opening the housing.
Before opening the housing:
— Check that a valid fire permit is available
— Check that there is no risk of explosion
— Switch off the power supply and wait for
t > 2 minutes.
CAUTION – Risk of burns!
Risk of burns on the flowmeter sensor posed by
hot media for measurement. The surface
temperature may exceed 70 °C (158 °F),
depending on the temperature of the medium.
Before starting work on the flowmeter sensor,
make sure that the device has cooled sufficiently.
Additionally observe the following points:
— In potentially explosive atmospheres, installation,
commissioning, maintenance, and servicing must only be
performed by properly trained personnel.
— When the housing is open, there is no longer any EMC
protection or protection against accidental contact.
— The sensor and transmitter must be grounded in
accordance with the applicable international standards.
— The flowmeter sensor must be connected to the transmitter
by means of the signal cable supplied by ABB Automation
Products; no other cable may be used for this purpose.
— In the case of the remote mount design, the signal cable
between the flowmeter sensor and the transmitter must
measure at least 5 m (16.4 ft) in length.
— It is essential that the temperature classes as per the
approvals contained in the section titled „Ex relevant
specifications acc. to cFMus" are observed.
— Please observe the drawing "3KXF002126G0009" in the
appendix.
32 - EN CI/FCB300/FCH300-X1 Rev. F | CoriolisMaster FCB330, FCB350, FCH330, FCH350
6.7.2

Cable entries

Special instructions for devices with North American
certification
Devices certified in accordance for North America are only
ever supplied with 1/2" NPT threads without glands.
6.7.3

Electrical connection

IMPORTANT (NOTE)
The housing for the transmitter and flowmeter
sensor must be connected to the potential
equalization PA. The operator must ensure that
when connecting the protective conductor (PE)
no potential differences can occur between
protective conductor and potential
equalization (PA).
A temperature of 70 °C (158 °F) at the cable entry is assumed
for the Ex calculations. Therefore, the cables used for the
supply power and the signal inputs and outputs must have a
minimum specification of 70 °C (158 °F).
Grounding
Fig. 29
According to NEC standards, the separate ground connection
between flowmeter sensor and transmitter can be established
as follows:
1. Strip the signal cable on a length of 100 ... 120 mm
(3.94 ... 4,72 inch).
2. Fan out the braided shield (1) that runs through the signal
cable to a length of 10 ... 15 mm (0.39 ... 0.59 inch). Twist
the disentangled wires of the braided shield so that they
form one strand.
3. Slide the green/yellow protective tubing over the strand,
leaving 10 mm (0.39 inch) protruding from the end (if
necessary, shorten the protective tubing).
4. Press on the ring-type terminal (2) supplied.
5. Connect to the grounding connection (3).