HART HK51, Руководство по эксплуатации

Страница: 13 / 22

14
Explosion-proof structure:
The electrical components and circuit boards of all explosion-proof smart
transmitters are placed inside the explosion-proof housing. Even if the
instrument produces a spark internal explosion due to a fault, the transmitter
housing has sufficient mechanical strength and flameproof performance. It not
only does not damage the explosion-proof enclosure, also does not explode
explosive mixtures outside the enclosure.
4.5 Notes for users of explosion-proof transmitters
Smart transmitter explosion-proof products are inspected by the national
instrumentation explosion-proof safety supervision and inspection station
(NEPSI), conforming to requirements specified in GB3836.1-2000, GB3836.2-
2000 and GB3836.4-2000 standards, the product explosion-proof mark is
ExdIICT6 (without acetylene) and ExiaIICT6; users shall pay attention to the
following matters when using the product:
◆ Users of the transmitter housing shall be grounded reliably when in use;
◆ Explosion-proof products are used in an ambient temperature ranging from
-20 ° C to +60 ° C;
◆ Explosion-proof products are used on site, and observe the principle of “open
the cover after power off” during maintenance;
◆ Intrinsically safe products shall be matched with safety barriers LB987S,
MTL787S, E787 etc. recognized by the explosion-proof inspection agency when
installed on site to constitute an intrinsically safe explosion-proof system. In order
to install with other types of safety barriers, it is necessary to obtain approval
from an explosion-proof inspection agency;
◆ Connection cable between the transmitter and the safety barrier's intrinsic end
is a two-core shielded cable (the cable shall have a cable sheath). The cross-
sectional area of the core wire is ≥ 0.5mm2, and the shielding layer is grounded
at a single end in a safe place and insulated from the product casing; the cable
wiring shall eliminate influence of electromagnetic interference as much as
possible, and cable distribution parameter shall be controlled within 0.06μF/1mH.
◆ The safety barrier shall be installed in a safe place. The installation, use and
maintenance shall comply with the safety barrier instruction manual.
Ex d IIC T6
Temperature group
Explosive mixture grade II C
Explosion-proof
Explosion-proof mar k
Ex ia IIC T6
Intrinsically safe
Temperature group
Explosive mixture grade II C
Explosion-proof mark
Monocrystalline Silicon High Stability Transmitter