User Manual

<8. Handling Caution>
8-4
IM 01C50T02-01E
Supply unit
The supply unit must be certied by a notify body
as FISCO model and following trapezoidal or
rectangular output characteristic is used.
Uo = 14 . . . 24 V (I.S. maximum value)
Io based on spark test result or other assessment,
ex. 133 mA for Uo = 15 V (Group IIC, rectangular
characteristic)
No specication of Lo and Co in the certicate and
on the label.
Cable
The cable used to interconnect the devices needs
to comply with the following parameters:
loop resistance R’: 15 . . . 150 Ω/km
inductance per unit length L’: 0.4 . . . 1 mH/km
capacitance per unit length C’: 80 . . . 200 nF/km
C’ = C’ line/line + 0.5 C’ line/screen, if both lines
are oating
or
C’ = C’ line/line + C’ line/screen, if the screen is
connected to one line
length of spur cable: max. 30 m (EEx ia IIC T4)
or 120 m (EEx ia IIB T4)
length of trunk cable: max. 1 km (EEx ia IIC T4)
or 1.9 km (EEx ia IIB T4)
Terminators
The terminator must be certied by a notify body as
FISCO model and at each end of the trunk cable
an approved line terminator with the following
parameters is suitable:
R = 90 . . . 100 Ω
C = 0 . . . 2.2 µF.
The resistor must be infallible according to IEC
60079-11. One of the two allowed terminators might
already be integrated in the associated apparatus
(bus supply unit).
FIELD INSTRUMENTS
Intrinsically safe ratings of the transmitter (FIELD
INSTRUMENTS) are as follows:
Supply/output circuit
EEx ia IIC T4
Maximum Voltage (Ui) = 17.5 V
Maximum Current (Ii) = 360 mA
Maximum Power (Pi) = 2.52 W
Internal Capacitance (Ci) = 1.5 nF
Internal Inductance (Li) = 8µH
EEx ia IIB T4
Maximum Voltage (Ui) = 17.5 V
Maximum Current (Ii) = 380 mA
Maximum Power (Pi) = 5.32 W
Internal Capacitance (Ci) = 1.5 nF
Internal Inductance (Li) = 8 µH
Sensor circuit
EEx ia IIC T4
Maximum Voltage (Uo) = 7.7 V
Maximum Current (Io) = 70 mA
Maximum Power (Po) = 140 mW
External Capacitance (Co) = 1.6 µF
External Inductance (Lo) = 7.2 mH
Number of Devices
The number of devices (max. 32) possible on a
eldbus link depends on factors such as the power
consumption of each device, the type of cable used,
use of repeaters, etc.
(2) Entity Model
Non-Hazardous
Locations
Hazardous Locations
F0803.ai
Terminator
Ex i
Field Instruments
(Passive)
Hand-
held-
Terminal
Supply Unit
Terminator
Data
U
U
I
YTA
1 23 4 5
Supply
Sensor
I.S. eldbus system complying with Entity
model
I.S. values Power supply-eld device:
Po ≤ Pi, Uo ≤ Ui, Io ≤ Ii
Calculation of max. allowed cable length:
Ccable ≤ Co - Σci - Σci (Terminator)
Lcable ≤ Lo - ΣLi
FIELD INSTRUMENTS
Intrinsically safe ratings of the transmitter (FIELD
INSTRUMENTS) are as follows:
Supply/output circuit
EEx ia IIC T4
Maximum Voltage (Ui) = 24.0 V
Maximum Current (Ii) = 250 mA
Maximum Power (Pi) = 1.2 W
Internal Capacitance (Ci) = 1.5 nF
Internal Inductance (Li) = 8 µH