51
BE 58-602 Pulsar
®
Model R96 Radar Transmitter
3.5.1 Agency (FM/CSA) Drawing and Entity Parameters
FISCO Concept:
The FISCO concept allows interconnection of intrinsically safe
apparatus to associated apparatus not specifically examined in such
combination. The criteria for the interconnection is that the voltage
(Ui or Vmax), the current (Ii or Imax) and the power (Pi) which
intrinsically safe apparatus can receive and remain intrinsically safe,
considering faults, must be equal or greater than the voltage (Uo or
Voc or Vt), the current (Io or Isc or It) and the power (Po or Pt) levels
which can be delivered by the associated apparatus, considering
faults and applicable factors. In addition, the maximum unprotected
capacitance (Ci) and (Li) of each apparatus (other than the
termination) connected to the fieldbus must be less than or equal to
5nF and 10µH respectively.
In each segment only one active device, normally the associated
apparatus, is allowed to provide the necessary energy for the
fieldbus system. The voltage (Uo or Voc or Vt), of the associated
apparatus has to be limited to the range of 14V to 24V d.c. All other
equipment connected to the bus cable has to be passive, meaning
that they are not allowed to provide energy to the system, except to
a leakage current of 50µA for each connected device. Separately
powered equipment needs a galvanic isolation to assure that the
intrinsically safe fieldbus circuit remains passive.
The cable used to interconnect the devices needs to have the
parameters in the following range:
Loop resistance R’: 15 … 150W/km
Inductance per unit length L’: 0.4 … 1mH/km
Capacitance per unit length C’: 80 … 200nF/km
C’ = C’ line/line + 0.5 C’ line/screen, if both lines are floating or
C’ = C’ line/line + C’ line/screen, if screen is connected to one
line.
Length of splice < 1m (T-box must only contain terminal
connections with no energy storage capability)
Length of spur cable: < 30m
Length of trunk cable: < 1km
At each end of the trunk cable an approved infallible termination with
the following parameters is suitable:
R = 90 … 100W and C = 0 … 2.2µF
The number of passive devices connected to the bus segment is not
limited for I.S. reasons. If the above rules are followed, up to a total
length of 1000m (sum of the length of the trunk cable and all spur
cables), the inductance and capacitance of the cable will not impair
the intrinsic safety of the installation.
APPROVED
TERMINATOR
Ui (Vmax) = 24V
Ii (Imax) = 280mA
Pi = 1.93W
or
Any approved termination on with
R = 90 ... 100W
C = 0 ... 2.2µF
The Pulsar Level Transmitter;
Model R96-52XX-1XX is suitable for use in a FISCO system
Model R96-52XX-3XX is suitable for use in a FNICO system
In accordance with ANSI/ISA 60079-27:2006.
HAZARDOUS (CLASSIFIED) LOCATION
Class I, Division 1, Groups A, B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1
UNCLASSIFIED LOCATION
Any FM/CSA Approved
Intrinsically Safe
Associated Apparatus with
Parameters suitable for the
FISCO Concept.
C R
Any FM Approved
Intrinsically Safe
Associated Apparatus with Entity
Parameters suitable for the
FISCO Concept.
Pulsar Level Transmitter
Model R96-52XX-1XX FISCO FIELD DEVICE
Model R96-52XX-3XX FNICO FIELD DEVICE
Ui (Vmax) = 17.5V
Ii (Imax) = 380 mA
Pi = 5.32 W
Ci = 0.5nF Li = 2.7µH
Leakage current < 50µA
Pulsar Level Transmitter
Model R96-52XX-1XX FISCO FIELD DEVICE
Model R96-52XX-3XX FNICO FIELD DEVICE
Ui (Vmax) = 17.5V
Ii (Imax) = 380 mA
Pi = 5.32 W
Ci = 0.5nF Li = 2.7µH
Leakage current < 50µA
099-5076-B
SHEET 3 OF 3
