CoriolisMaster FCB400, FCH400 CORIOLIS MASS FLOWMETER | OI/FCB400/FCH400-EN REV. E 19
… 2 Use in potentially explosive atmospheres
… Electrical data
Special connection conditions
Note
The AS plug-in card (24 V DC loop power supply) may only be
used to power the internal inputs and outputs on the device.
It must not be used to power external circuits!
Note
If the protective earth (PE) is connected in the flowmeter's
terminal box, you must ensure that no dangerous potential
difference can arise between the protective earth (PE) and the
potential equalization (PA) in areas with explosion risk.
Note
• For devices with a power supply of 11 to 30 V DC, on-site
external overvoltage protection must be provided.
• You must make sure that the overvoltage is limited to
140 % (= 42 V DC) of the maximum operating voltage.
The output circuits are designed so that they can be connected
to both intrinsically-safe and non-intrinsically-safe circuits.
• Combining intrinsically safe and non-intrinsically safe circuits
is not permitted.
• On intrinsically safe circuits, potential equalization should be
established along the entire length of the cable used for the
signal outputs.
• The rated voltage of the non-intrinsically safe circuits is
U
M
= 30 V.
• Intrinsic safety is preserved If the rated voltage U
M
= 30 V is
not up-scaled when connections are established to non-
intrinsically safe external circuits.
• The information in Changing the type of protection on
page 24 must be observed when changing the type of
protection.
Devices connected to the relevant equipment must not be
operated at over 250 V
rms
AC or 250 V DC to ground.
Installation in accordance with ATEX or IECEx must comply with
the applicable national and international standards and
directives.
Installation in the USA or Canada must comply with ANSI / ISA
RP 12.6, ‘Installation of intrinsically safe systems for hazardous
(classified) locations’, the ‘National Electrical Code (ANSI / NFPA
70), sections 504, 505’ and the ‘Canadian electrical code (C22.1-
02)’.
Apparatus connected to the flowmeter must have appropriate
explosion protection approval in accordance with the Entity
concept.
The apparatus must have intrinsically safe circuits.
The apparatus must be installed and connected in accordance
with the relevant manufacturer documentation.
The electrical specifications in Electrical data on page 16 must
be observed.
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