Yokogawa MLX - Manual (Page 11)

Page 11 of 49
IM 60A02S01-01E-A
2.6 Installation of an Explosion-Protected Instrument
WARNING
If a customer makes a repair or modification and the instrument is not restored to its
original condition, its safety may be compromised and the instrument may be hazardous
to operate. Please contact Yokogawa before making any repair or modification to an
instrument.
CAUTION
This instrument has been tested and certified as being Explosionproof. Please note that
severe restrictions apply to this instrument’s construction, installation, external wiring,
maintenance and repair. A failure to abide by these restrictions could make the instrument
a hazard to operate.
WARNING
Maintaining the safety of Explosionproof equipment requires great care during mounting,
wiring, and piping. Safety requirements also place restrictions on maintenance and repair.
Please read the following sections very carefully.
2.6.1 Factory Mutual (FM) Certification
1) Technical Data
a. FM Explosionproof/Dust-Ignition-Proof Type
Caution for FM Explosionproof/Dust-Ignition-Proof type.
Note 1. Model MLX Loop Process Indicators with optional code /FF1 applicable for
use in potentially hazardous locations:
• Certificate No. 4000798
• Conforms to: FM 3600, FM 3615, FM 3616, UL 1203
• Explosionproof/Dust-Ignition-Proof for Class I, II, II; Division 1 & 2, Groups A –
G; Class I, Zone 1, Group IIC T4
• Enclosure rating: NEMA 4X.
• Temperature Class: T4
• Ambient Temperature: –40°C to 80°C
Note 2. Wiring
•
For an ambient temperature ≥70°C, heat resistant cables shall be used with a
rating of at least 20°C above the ambient temperature.