Yokogawa MLX - Manual (Page 13)

Page 13 of 49
IM 60A02S01-01E-A
- Class I, Zone 2, Group IIC T4.
- Tamb. –40°C to 80°C
• Enclosure rating: NEMA 4X.
• Temperature Class: T4
• Ambient Temperature: –40°C to 80°C
Note 2. Entity Parameters
• Intrinsically Safe Apparatus Parameters
[Groups A - G]
Ui = 24 V Ci = 0 pF
Ii = 150 mA Li = 0 µH
Pi = 0.65 W
Note 3. Wiring
• All wiring shall comply with National Electrical Code ANSI/NEPA70 and Local
Electrical Codes.
• For an ambient temperature ≥70°C, heat resistant cables shall be used with a
rating of at least 20°C above the ambient temperature.
• In hazardous location, wiring shall be in conduit.
WARNING: A SEAL SHALL BE INSTALLED WITHIN 50 cm OF THE
ENCLOSURE.
When installed in Division 2,“FACTORY SEALED, CONDUIT SEAL NOT
REQUIRED”.
Note 4. Installation
• Installation should be in accordance with ANSI/ISA RP12.6 “Installation of
Intrinsically Safe Systems for Hazardous (Classified) Locations” and the
National Electric Code (ANSI/NFPA 70).
• The safety barrier must be FM approved.
• Strictly observe the “WARNING” on the attached nameplate.
WARNING: SUBSTITUTION OF COMPONENTS MAY IMPAIR INTRINSIC
SAFETY.
WARNING: DO NOT OPEN COVERS WHEN AN EXPLOSIVE ATMOSHPERE
MAY BE PRESENT. INSTALL IN ACCORDANCE WITH THE INSTRUCTION
MANUAL.
Note 5. Maintenance and Repair
• The instrument modification or parts replacement by other than authorized
representative of Yokogawa Electric Corporation is prohibited and will void Factory
Mutual Explosionproof Approval.
Note 6. Special Conditions for Safe Use
• In the case where the enclosure of the MLX is made of aluminum, it must be
installed such, that, even in the event of rare incidents, ignition sources due to impact
and friction sparks are excluded.