KROHNE UFM 3030 EEx EN User Manual
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UFM 3030
1.5.2 Intrinsically safe sensor circuits
The on the front-end printed circuit board integrated voltage/current limiting circuits are connected
via SMB receptacles of type Radiall R114 665 (for coaxial cables). They are soldered into the PCB
at the front side of the board (close to the local display unit). The connections are established during
the installation of the IFC 030…-EEx electronics unit inside the flameproof electronics compartment
of the flow converter housing by KROHNE Altometer personnel.
1.5.3 In-/output
circuits
The analogue input circuit A1 is protected against overcurrent by a fuse of type TR5 No. 19372 in
accordance with IEC 127-3 of manufacturer Wickmann. This fuse is rated
T 50 mA, 250 V AC and has a breaking capacity of 35 A.
1.5.4 MODIS
design
The MODIS versions of the UFC 030i-EEx is available with a 100…240 V AC and 24 V AC/DC
power supply unit. The power supply printed circuit board of the UFC 030i-EEx is therefore
equipped with two MODIS modules, which are approved under no. PTB 97 ATEX 2265 U.
1.5.5 Power supply units
The power supply units of the MODIS versions are based on those of the standard units, with the
main difference that the analogue input A1 and its circuitry is removed from the power supply
printed circuit boards. The ±33 V secondary output of the mains transformer is no longer needed to
generate the ±24 V for the analogue inputs driver logic.
1.5.6 MODIS
modules
The modules are suitable for a maximum ambient temperature of 65°C with non-driven electronics
and installed in the closed flameproof electronics compartment of the flow converter housing. The
minimum ambient temperature is limited at -20°C.
Module Terminal
designation Function/data
P-SA
I
⊥
I
Current output (0/4-20 mA), passive
Vi = 30 V, Ii = 250 mA, Pi = 1.0 W
Ci = 5 nF, Li
≈
0
FA-ST
B1, B1
⊥
or B2, B2
⊥
Pulse (frequency) output or status in-/output, all passive
The function can be set by software
Vi = 30 V, Ii = 250 mA, Pi = 1.0 W
Ci = 5 nF, Li
≈
0
F-PA
D,D
⊥
Fieldbus module, type Profibus system, passive
Vi = 30 V, Ii = 380 mA, Pi = 5.32 W
Ci = 5 nF, Li
≈
0
The UFC 030i-EEx can be equipped with a combination of two MODIS modules, see table below.
The possible combinations of the installed MODIS modules and the terminal designation in the
terminal compartment of the flow converter housing are listed in table below.
Combination of MODIS modules
Designation of intrinsically safe outputs
P-SA FA-ST
I
⊥
I B1
B1
⊥
P-SA F-PA
I
⊥
I D
D
⊥
FA-ST FA-ST
B2
B2
⊥
B1
B1
⊥
FA-ST F-PA B1
B1
⊥
D
D
⊥