KROHNE ALTOSONIC III EN - Manual (Page 29)

Installation and operating instructions
29 ALTOSONIC III
5) Sticker with handling instructions for insulating cover plate
6) Metal dividing plate intrinsically safe and non-intrinsically safe terminals
7) Cable gland (size M20x1.5 or Pg13.5) or cable adapter (e.g. M20x1.5 to ½ inch NPT)
8) PE/FE U-clamp terminal size M5
9) External U-clamp terminal size M5 for equipotential bonding cable.
5.5 Technical data Electrical power supply unit
The UFC III…-EEx electronics unit is equipped with a switching-mode power supply, which is available in two supply
voltage ranges, namely:
• 100…240 V AC power supply;
• 24 V AC/DC power supply.
The power supply’s mains transformer provides the galvanic separation between the primary circuit (i.e. mains supply)
and the secondary circuits. The secondary windings of the mains transformer deliver the following output voltages:
The table below lists the electrical input voltages of the power supply units, at the primary side of mains transformer.
Power supply Nominal voltage Tolerances Mains supply
voltage Power supply Nominal
voltage
Minimum Maximum Limit
24 V AC/DC 24 V AC -15/+10% 20.4 V AC 24 V AC/DC 24 V AC
24 V DC -25/+33% 18 V DC 32 V 24 V DC
100…240 V AC 100…240 V AC -15/+10% 85 V AC 100…240 V AC 100…240 V AC
The table below lists the electrical data of the power supply outputs.
Power supply output Parameter Minimum Nominal Maximum Limit
Electronics pos. supply Voltage +5.4 V +6 V +6.54 V (1) 40 V
Current 225 mA 400 mA 571 mA -
Electronics neg. supply Voltage -5.2 V -6 V -9 V 40 V
Current 20 mA 50 mA 88 mA -
Analogue input driver Voltage 21.6 V 24 V 26.4 V 40 V
(1) Depends on the load.
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 UFC III…-EEx electronics unit inside
the flameproof electronics compartment of the flow converter housing by KROHNE personnel.
Signal in-/outputs
Standard versions: Connector X1, pins 1, 2, 3, 4 and 5 on power supply PCB
24 V DC ±10% (40 V DC max) , 0-22 mA (100 mA max), Vm = 264 V
Ultrasonic sensor circuits: 6 separate SMB connectors X1, X2, X6, X7, X10 and X11 on front-end PCB in type of
protection Intrinsic Safety EEx ib IIC. Maximum values (i.e. entity parameters):
Vo = 8.15 V, Io = 220 mA
Lo = 0.5 mH, Co = 1.3 µF
Environment temperatures: Ambient temperature Ta -40°C...+70°C / Ta -40°F...+158°F
Component ambient temperature Tac (inside closed converter housing): during unfavorable operation 85°C / 185°F
under fault conditions 100°C / 212°F.
Power dissipation
At nominal supply voltage and full load at the outputs, the nominal power dissipation of the UFC III…-EEx with the
100…240 V AC power supply is limited at a maximum of 11 W and with 24 V AC/DC supply, limited to 8 W.