KROHNE OPTIMASS / 400 - Page 38

3 ELECTRICAL CONNECTIONS
38
OPTIMASS / 400
www.krohne.com 10/2022 - 4003491806- AD OPTIMASS 400 Atex R06 en
Notes:
• Options separated with "/" are set by the user in the converter.
• Options separated with "or" are hardware options and must be ordered.
• All outputs are passive unless marked differently.
• I/O circuits shown as Ex i are always in the intrinsically safe (Ex ia) protection category.
Fieldbus I/O, Profibus, Fieldbus I/O and Foundation Fieldbus can all be in the intrinsically safe
category.
• A maximum of four intrinsically safe (Ex ia) I/Os are possible. All intrinsically safe circuits are
galvanically insulated, with respect to earth and each other. To prevent the possible hazard of
combined voltages and currents, the wiring of Ex ia circuits must be separated and where
applicable, local legislation / regulations should be followed. For example: IEC/EN 60079-14
clause 12.2.
• The Ex ia signal I/Os can only be connected to other Ex ia or ib certified devices (for example
intrinsically safe isolation amplifiers) even if such devices are installed in the non-hazardous
area.
• Connection to non Ex i devices will mean that the meter is no longer intrinsically safe.
• Terminals L and N (or L+ and L-) for power supply connection are not intrinsically safe. To
achieve the required separation between the non-Ex i and the Ex i circuits (IEC / EN 60079-11)
the power supply terminals have a touch guard (cover) that can be closed and secured with a
snap-in lock. The touch guard (cover) MUST be in the closed position before power is supplied
to the converter.
• Do not try to repair flameproof joints. For more information regarding flameproof joints,
please contact the manufacturer.
Sensor circuit, intrinsically safe. Type of protection intrinsic safety: Ex ia IIC
Terminals PCB Board Maximum values
SA+, SA-, SB+, SB- U
o
11.8 V
I
o
13 mA
P
o
39 mW
C
o
90 nF
L
o
100 mH
Linear characteristic
RTD / DMS circuit, intrinsically safe. Type of protection intrinsic safety: Ex ia IIC
Terminals PCB Board Maximum values
T1, T2, T3, T4 U
o
11.8 V
I
o
10.5 mA
P
o
31 mW
C
o
340 nF
L
o
100 mH
Linear characteristic