Yokogawa EXA SC202 2-Wire Conductivity Transmitter/Analyzer - Manual (Page 26)

IM 12D08B02-01E
Specifications 2-13
2-11. Control Drawing of SC202S FF/PB Specification (FM Intrinsically safe Entity)
Unclassified Location Classified Location
Division 1
FM Approved
barrier
Voc (Vt) d 24 V
Ioc (It) d 250 mA
Poc (Pt) d 1.2 W
Ca t 220pF+ Ccable
La t 0 H + Lcable
Sensor
Connections
Max. cablelength: 60 mtr.
Cable dia. : 3…12 mm.
FM Class I, DIV. 1, Group ABCD
T4 for ambient temp. d 55 qC
-
+ I.S.
certified
Terminator
I.S.
certified
Terminator
SC202S-F
or SC202S-P
Transmitter Transmitter
- + Sensor
Connections
- + - +
x 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 PJ, or are FM Approvals entity approved and meet connection
requirements.
x Electrical data of the SC202S-F & SC202S-P:
-
Supply circuit:
Maximum input voltage Vmax= 24 V
Maximum input current Imax= 250 mA
Maximum input power Pi= 1.2 W
Effective internal capacitance Ci = 220 pF;
Effective internal inductance Li = 0 PH.
-
Sensor input circuit:
Maximum output voltage Vt= 14.4 V; Maximum output current It= 10 mA
Maximum allowed external capacitance Ca= 59.36 nF
Maximum allowed external inductance La= 340 mH
x Any FM Approved barrier may be used that meets the following requirements:
Voc or Vt d 24 V
Ioc or It d 250 mA
Poc or Pt d 1.2 W
Ca t 220 pF + Ccable; La t 0 PH + Lcable
When installing this equipment, follow the manufacturer’s installation drawing.
Installation should be in accordance with ANSI/ISA RP 12.06.01 “Installation of
Intrinsically Safe Systems for Hazardous (Classified) Locations” and the National
Electrical Code (ANSI/NFPA 70).
Associated apparatus connected to the barrier must not use or generate more than
250 Vrms or Vdc.
x Resistance between Intrinsically Safe Ground and earth ground must be less than 1.0
Ohm.
x In case of using cable glands in Outdoor location, they shall be UV rated or made of metal.
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.