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Verfügbare Sprachen
Verfügbare Sprachen
Levelflex M
7.4 Overvoltage protector (e.g. HAW 262 Z , see figure 2 and figure 4):
- Connect the external overvoltage protector and the measuring device to the local potential matching system.
- The intrinsically-safe circuit is earthed under field conditions, therefore run a potential matching line along the length of the
cable both inside and outside the explosion-hazardous area.
- The cable connecting the overvoltage protector and the measuring device shall be no longer than 1 m,
- Route cable protected (e.g. in an armoured hose).
Tab. 2a
Electronic insert 2W-HART
Power supply and signal circuit in protection type: intrinsic safety EEx ia IIC or IIB
Ui = 30 V
Ii = 300 mA
Pi = 1 W
Profibus PA or Foundation Fieldbus electronic insert as per FISCO model or ENTITY:
Power supply and signal circuit in protection type: intrinsic safety EEx ia IIC or IIB
Levelflex M with electronic insert for Profibus PA or Foundation Fieldbus EEx ia IIC (FISCO model)
Ui = 17.5 V
or
Ii = 500 mA
Pi = 5.5 W
Tab. 2b
Option:
Power supply and signal circuit for remote display, e.g. FHX40, in protection type: intrinsic safety EEx ia IIC or IIB
Uo = 4.2 V
Io = 34 mA
Po = 36 mW
for connecting the Commubox service interface with the associated ToF cable:
Commubox output + ToF cable:
Uo = 3.74 V
Io = 9.9 mA
Po = 9.2 mW
When interconnected to a Levelflex M, the following results apply:
for material group:
IIC
IIB
Zone 0 Safety Instructions:
8.) In Zone 0, potentially explosive air/vapour mixtures must only occur under atmospheric conditions:
-20° C
0.8 bar
If no potentially explosive mixtures are present, or if additional protective measures have been taken according to
EN1127-1, the transmitters may be operated under other atmospheric conditions in accordance with the manufacturer's
specifications.
9.) Only install the devices in media for which the wetted materials have sufficient durability.
10.) Associated apparatus with galvanic isolation between intrinsically-safe and non-intrinsically-safe circuits are preferred.
Endress+Hauser
effective inner inductance
effective inner capacitance
Ui = 24 V
Li = 10 µH
Ii = 250 mA
Ci = 5 nF
Leak current ≤ 50 µA
Pi = 1.2 W
effective inner inductance
effective inner capacitance
Characteristic curve: linear
effective inner inductance
effective inner capacitance
for material group IIC:
Lo =
0.15 mH
≤ 8 µF
Co
Co
≤ T ≤
+60° C
≤ p ≤
1.1 bar.
Li = negligible
Ci = 13 nF
Li = negligible
Ci = negligible
Li = negligible
Ci = negligible
permitted outer inductance
permitted outer capacitance
0.5 mH
1 mH
≤ 7 µF
≤ 5.5 µF
10 µF
XA 266F-A
Characteristic curve: linear
Lo ≤ 340 mH
Co ≤ 100 µF
2 mH
5 mH
≤ 5 µF
≤ 4 µF
7
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