KROHNE BM 70 M - Manual (Page 91)

BM 70M-EEx/ BM 70Mi-EEx 5
3.1.3 Special lock
The sealing covers of terminal compartment and electronics compartment are secured by special
locks. The locking screw requires use of an Allen key (4 mm size).
3.1.4 I/O functions
The following limit values need to be taken into account when connecting the I/O interfaces of the
BM 70 M-EEx level gauges:
BM 70 M-EEx with non-intrinsically safe I/O functions
I/O function
(1)
Nominal values of the non-
certified receiver instrument
Added restriction
Acc. to Standard Installation
and Operating Instructions Acc. to Standard Installation
and Operating Instructions Power for receiver
instruments max. 250 V
(1)
Only for connection to circuits with “functional extra-low voltage with safety separation (PELV)“
BM 70 Mi-EEx with intrinsically safe I/O functions
I/O function Marking Maximum safety values
Passive
current output EEx ia IIC or
EEx ib IIC Ui ≤ 30V Ii ≤ 250mA
Ci
≤
5nF Li = negligible
Passive
switching output EEx ia IIC or
EEx ib IIC Ui ≤ 30V Ii ≤ 250mA
Ci
≤
5nF Li = negligible
Interface
Profibus-PA
(1)
EEx ia IIC or
EEx ib IIC/IIB Ui ≤ 30V Ii ≤ 300mA
Ci ≤ 5nF Li = negligible
Interface
Fieldbus FF
(1)
EEx ia IIC or
EEx ib IIC/IIB Ui ≤ 30V Ii ≤ 300mA
Ci ≤ 5nF Li = negligible
(1)
suitable for connection to intrinsically safe Fieldbus systems based on the FISCO Model
The intrinsically safe circuits of the I/O functions are galvanically isolated both from ground and
also from each other (test voltage > 500 VAC).
Furthermore, all intrinsically safe circuits are safety-separated from the non-intrinsically safe
power circuits up to a peak voltage of 375 V.
3.2 Flange systems
3.2.1 Category / Zone allocation
The allowable operating conditions for the flange systems of the BM 70 M-EEx level gauges are
given in the following tables.
Note:
The application restrictions marked with indices should be observed without fail.
Flange system Allowed operating conditions
Material Version Antenna in
Zone
Flange temperature
/ product
temperature [°C] Max. allowable tank -
pressure
[bar]
0 - 20 ... 60°C
(1)
-0.2 ... 0.1
(1)
(0.8 ... 1.1 bar abs.)
V96 and SA
all certified variants
1 see Sect. 3.3.2 Acc. to Standard Installation
and Operating Instructions
(1)
limited to atmospheric conditions in accordance with EN 50 284