Azbil JTD720A, User Manual, Page: 20 / 76

Installation Azbil Corporation
2-2 Model JTD720A - Smart Multivariable Transmitter
2-1-2 : Environmental conditions for TIIS explosion-proof
transmitter
TIIS Explosion-proof transmitter installation precautions
TIIS Explosion-proof transmitters have passed inspections at a public organization
in compliance with Japanese Labor Safety and Hygiene Laws. As specified, use
explosion-proof transmitters in hazardous locations. Smart Transmitters are available
in two types of explosion-proof specifications: flameproof, special explosion-proof
specifications and intrinsically-safe specifications.
Explosion-proof transmitters have a conformance mark that provides required
information for explosion-proof performance. Install explosion-proof transmitters
correctly, and follow the information on the name plate.
Special condition for safe use (for NEPSI flameproof)
- The terminal cover has at least 9 engaged threads.
- The cover (with or without window) has at least 9 engaged threads.
- The housing has at least 10.5 engaged threads.
Environmental conditions for flameproof, special
explosion-proof transmitter
Install a flameproof, special explosion-proof transmitter in locations that meet the
following explosion class, ignition temperature, and hazardous environment class
conditions:
• Explosion class and ignition temperature of gas:
IIB + H
2
T
4
(IIB + H
2
T
4
: Gas equivalent to IIC, steam and Hydrogen
T4: Gas and steam whose ignition temperature is 135°C or higher.)
• Hazardous area classification:
Hazardous Zones 1 and 2
Do not install this device in Zone 0.
• Temperature
Select a location where the temperature always stays under high limits specified by
the conformance mark. AMBIENT TEMP refers to the ambient temperature of the
transmitter and METER BODY TEMP refers to the temperature of the meter body
that is in contact with the liquid. The low limit is -15°C for both ambient temperature
and meter body temperature.