Altometer
13
Notes :
- shorts for in/output functions:
CO= current output, PO=Pulse Output, SO= Status Output, CI= Control Input,
PA=Profibus PA, FF=Foundation Fieldbus, DP=Profibus DP
- all in/outputs are passive unless otherwise noted as active (a)
- n.c. is not connected
The IO circuits named Ex i IO, Ex i Option are always in type of protection Intrinsic
safety (EEx ia). The IO circuits Fieldbus IO Profibus PA and Fieldbus IO Foundation
Fieldbus
can
be in type of protection Intrinsic safety.
A maximum of 4 intrinsically safe (EEx ia) in/outputs are possible. All intrinsically safe
circuits are galvanically insulated with respect to earth and to each other. To avoid
summation of voltages and currents, the wiring of the of these EEx ia circuits must be
sufficiently separated, e.g. in line with the requirements of standard EN IEC 60079-
14, section 12.2.
The EEx ia signal in/outputs may only be connected to other EEx ia or ib certified
apparatus (e.g. intrinsically safe isolation amplifiers) , even if these apparatus are
installed in the non-hazardous area !
Connection to an non-EEx i apparatus cancels the EEx ia properties of the flowmeter.
Terminals L, N (or L+, L-) for mains connection are
always
non
-
intrinsically
safe
.
To achieve the necessary spatial separation to EN 50 020 between the non-EEx i
and EEx i circuits the mains terminals are provided with an half-circular insulation
cover with "snap-on" lock. This cover has to be closed before energizing the
converter.
Note: for converters with an EEx e terminal compartment it is allowed to open this
compartment in energized state for short periods and to access the intrinsically safe
terminals for possible checks insofar the half-circular insulation cover over the non-
intrinsically L, N (L+, L-) terminals is kept closed.
