Stamp Company : Stamp Certification Institute :
Signature : Remarks :
Model EXA SC202S-F
Model EXA SC202S-P
No revision to drawing without prior
FM Approval
Title : FM Control Drawing SC202S-F & SC202S-P (Intrinsic safe Fisco
concept)
Number : FF1-SC202S-00 Page : 7of 10
Revision : 2.4
YOKOGAWA EUROPE B.V.
Date : 26/07/2004
〈 Sensor(s) are of a passive type to be regarded as ’simple apparatus’, devices which neither store nor
generate voltages over 1. 5 V, currents over 0.1 A, power over 25 mW or energy over 20
µJ, or are FM
Approvals entity approved and meet connection requirements.
〈 Electrical data of the EXA SC202S-F & SC202S-P:
- Supply circuit: Vmax=17,5 V; Imax=380 mA; Pi=5,32 W; Ci=737 pF; Li=2.6 µH.
- Sensor input circuit: Vt=14.4 V; It=12.8 mA; Ca=103 nF; La=200 mH
〈 Any FM Approved FISCO barrier may be used that meets the following requirements:
Voc or Vt ≤ 17,5 V; Ioc or It ≤ 380 mA; Poc or Pt ≤ 5,32 W
When installing this equipment, follow the manufacturer s installation drawing.
Installation should be in accordance with ANSI/ISA RP 1 2.06.01 Installation of Intrinsically Safe Systems for
Hazardous (Classified) Locations and the National Electrical Code (ANSI/NFPA 70).
Associated apparatus connected to the FISCO barrier must not use or generate more than 250 Vrms
or Vdc.
〈 Resistance between FISCO Intrinsically Safe Ground and earth ground must be less than 1.0 Ohm.
〈 The FISCO concept allows the interconnection of several I.S. apparatus not specifically examined in such
combination. The criterion for such interconnection is that the volt age (Vmax), the current (Imax) and the
power (Pi) which I.S. apparatus can receive and remain intrinsically safe, considering faults, must be equal to
or greater that the voltage (Voc, Vt), the current (Ioc, It) and the power (Poc, Pt) which can be provide de by the
FM approved FISCO barrier. In addition, the maximum unprotected residual capacitance (Ci) and inductance
(Li) of each apparatus (other than the terminator) connected to the Fieldbus must be less than or equal to 5nF
and 10 H respectively.
〈 In each I.S. Fieldbus segment only one active source, normally the FM Approved FISCO barrier, is allowed
to provide the necessary power for the Fieldbus system. All other equipment connected to the bus cable has to
be passive (not providing energy to the system) , except to a leakage current of 50 A for each connected
device. Seperately powered equipment needs a galvanic isolation to insure that the I.S. Fieldbus circuit
remains passive.
〈 The cable used to interconnect the devices needs to comply with the following parameters:
Loop resistance R : 15 1 50 /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 line are floating)
(C = C line/line + C line/screen if the screen is connected to one line)
Length of spur cable: max. 30 m
Length of trunk cable: max. 1 km
Length of splice : max. 1 m
WARNING
- Substitution of components may impair Intrinsic Safety
- To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing or read,
understand and adhere to the manufacturer s live maintenance procedures.
Unclassified Location
Classified Location
Division 1
FM Approved
FISCO barrier
Voc (Vt)
¡Ü
17,5 V
Ioc (It)
¡Ü
380 mA
Poc (Pt)
¡Ü
5,32 W
FM Approved
Terminator
R = 90..100
C = 0..2,2 F
EXA
SC202S-F
& SC202S -P
Sensor
Connections
Max. cablelength: 60 mtr.
Cable dia. : 3 1 2 mm.
FM Class I, DIV. 1, Group ABCD
T4 for ambient temp.
≤ 55 ϒC
T6 for ambient tem
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