<Appendix 3 Control Drawings>
App.3-5
IM 12A01A02-71E 3rd Edition : Mar. 23, 2018-00
Model: FLEXA Series Date: May 29, 2017
Rev. Doc. No.: IFM039-A72 P.3
Yokogawa Electric Corporation
Notes:
1. No revision to this drawing without prior approval of FM.
2. Installation must be in accordance with the National Electric Code (NFPA 70),
ANSI/ISA-RP12.06.01 and relevant local codes.
3. FISCO installation must be in accordance with ANSI/UL-60079-25.
4. The associated apparatus must be FM-approved.
5. The associated apparatus must be a FISCO power supply or a linear source meeting the
following conditions.
Uo (or Voc) ≤ Ui
Io (or Isc) ≤ Ii
Po ≤ Pi
Co (or Ca) ≥ Ci + Ccable
Lo (or La) ≥ Li + Lcable
6. Control equipment connected to the associated apparatus must not use or generate a voltage
which exceeds Um of the associated apparatus.
7. The control drawing of the associated apparatus must be followed when installing the
equipment.
8. When installed in Division 1, Zone 0 or Zone 1, Sensor 1 may be a simple apparatus or an
intrinsically safe apparatus meeting the conditions below.
When installed in Division 2 or Zone 2, Sensor 1 may be a simple apparatus or a nonincendive
field wiring apparatus meeting the conditions below, or alternatively, it may be equipment
suitable for Division 2 or Zone 2 respectively, if a suitable wiring method other than nonincendive
field wiring is employed.
Ui (or Vmax) ≥ Uo
Ii (or Imax) ≥ Io
Pi ≥ Po
Ci ≤ Co – Ccable
Li ≤ Lo – Lcable
9. The control equipment must be an FM-approved FISCO power supply, FNICO power supply or
an associated nonincendive field wiring apparatus meeting the conditions below. Alternatively, it
may be general-purpose equipment, if a suitable wiring method other than nonincendive field
wiring is employed.
Uo (or Voc) ≤ Ui
Co (or Ca) ≥ Ci + Ccable
Lo (or La) ≥ Li + Lcable
10. WARNING – POTENTIAL ELECTROSTATIC CHARGING HAZARD – WHEN THE
EQUIPMENT IS USED IN HAZARDOUS LOCATIONS, AVOID ANY ACTION WHICH
GENERATE ELECTROSTATIC DISCHARGE SUCH AS RUBBING WITH A DRY CLOTH.
11. WARNING – IN THE CASE WHERE THE ENCLOSURE OF THE ANALYZER IS MADE OF
ALUMINUM, IF IT IS MOUNTED IN ZONE 0, IT MUST BE INSTALLED SUCH THAT, EVEN
IN THE EVENT OF RARE INCIDENTS, IGNITION SOURCES DUE TO IMPACT AND
FRICTION SPARKS ARE EXCLUDED
12. WARNING – SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC SAFETY AND
SUITABITLITY FOR DIVISION 2 / ZONE 2.
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