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6.
HAZARDOUS DUTY TYPE
INSTRUMENT
In this section, further requirements and differences for
explosion proof type instrument are described. For
explosion proof type instrument, the description in this
chapter is prior to other description in this Instruction
Manual.
NOTE
The terminal box cover is locked by special
screw. In case of opening the terminal box
cover, please use the Hexagonal Wrench
attached.
CAUTION
Be sure to lock the cover with the special screw
using the Hexagonal Wrench attached after
tightening the cover.
6.1 FM
(1) Technical Data
• Explosionproof for Class I Division 1 Groups A, B,
C & D. Dust-ignitionproof for Class II/III Division 1
Groups E, F & G. Intrinsically safe (electrode) for
Class I Division 1 Groups A, B, C & D
Electrode circuit Vmax : 250V ac/dc
Temp. Class. T6
Enclosure : NEMA 4X
• Nonincendive for Class I, Division 2, Groups A, B,
C & D ; Suitable for Class II, Division 2, Groups F
& G ; Class III, Division 1 and 2
Intrinsically safe (electrode) for Class I Division 1
Groups A, B, C & D
Electrode Circuit Vmax : 250V ac/dc
Excitation Circuit : 130Vp 72/75Hz
Temp. Code : T5
Enclosure : NEMA 4X
6. HAZARDOUS DUTY TYPE INSTRUMENT
(2) Installation
WARNING
• All wiring shall comply with national electrical
code ANSI/NFPA 70 and local electrical code.
• In hazardous locations, wiring to be in conduit
as shown in the figure.
(3) Operation
WARNING
• Open circuit before opening the covers and
seal all conduits with in 18 inches in hazardous
locations.
• Take care not to generate mechanical spark
when access to the instrument and peripheral
devices in hazardous locations.
(4) Maintenance and Repair
WARNING
The instrument modification or parts replacement
by other than authorized representative of
Yokogawa Electric Corporation is prohibited and
will void the approval of Factory Mutual Re-
search Corporation.
HAZARDOUS LOCATIONS
Magnetic Flow Converter
18" (457 mm) Max.
6-1
Conduit
Sealing Fitting
F0601.EPS
IM 1E6D0-01E
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