BEKA BA377NE, Руководство пользователя

Страница: 5 / 47

5
1. DESCRIPTION
The BA377NE is an Ex nA non-sparking and Ex tc
certified, panel mounting instrument with a single
input that can be installed in Zone 2 or Zone 22
without the need for Zener barriers or galvanic
isolators. It may be configured on-site as a Timer or
as a Clock. As a Timer the BA377NE is able to
measure and display the elapsed time between
external events, or control external events via two
optional factory fitted control outputs.
When configured as a Clock, the instrument can
display time in a variety of formats and the two
optional control outputs may be configured to switch
loads
on and off at pre-set times.
This instruction manual is divided into sections.
Common features
2. Ex nA certification
3. System design for hazardous areas
4. Installations
5. Accessories
Timer
6. Operation as a timer
7. Configuration example
8. Maintenance
Clock
9. Operation as a clock
10. Configuration example
11. Maintenance
The common features sections of this instruction
manual describe ATEX Ex nA certification for use in
gas atmospheres.
Ex tc dust certification is described in Appendix 1.
For international applications the BA377NE has
IECEx gas and dust certification which is described
in Appendix 2.
For applications in the USA and Canada the
BA377NE has ETL and cETL certification which is
described in Appendix 3.
This instruction manual supplements the
abbreviated instruction sheet supplied with each
instrument.
2. Ex nA NON - SPARKING CERTIFICATION
The BA377NE has ATEX and IECEx gas and dust
certification. This section of the instruction manual
describes ATEX gas certification. Dust, IECEx and
other approvals are each described in separate
appendixes to this manual.
The Ex nA and Ex tc
certification of the instrument is unaffected by
whether it is configured as a Timer or as a Clock.
2.1 ATEX Ex nA certification
Notified Body Intertek Testing and Certification Ltd
have issued the BA377NE with a Type Examination
Certificate number ITS16ATEX48409X.
This has
been used to confirm compliance with the European
ATEX
Directive for Group II, Category 3G
equipment. The instrument carries the Community
Mark and, subject to local codes of practice, may be
installed in any of the European Economic Area
(EEA) member countries and in the EEA EFTA
states, Iceland, Liechtenstein and Norway. ATEX
certificates are also acceptable in Switzerland and
Turkey.
The European Commission's Blue Guide
lists the member states, overseas countries and
territories
that have adopted harmonisation
legislation.
This section of the instruction manual describes
ATEX installations in explosive gas atmospheres
conforming with EN 60079-14
Electrical installations
design, selection and erection . When designing
systems for installation outside the UK the local
Code of Practice should be consulted.
2.2 Zones, gas groups and T rating
The Timer or Clock has been certified as Group II
Category 3G Ex ic nA IIC T5 Gc –40°C
≥ Ta ≥ +60°C
apparatus. This is non-sparking apparatus
complying with EN 60079-15 Equipment protection
by type of protection 'n' that minimises the risk of
arcs or sparks capable of creating an ignition hazard
occurring during conditions of normal operation.
The instrument's front panel push button contacts
are non incendive and have been certified
intrinsically safe Ex ic without the need for an
external Zener barrier or galvanic isolator, as shown
on the Type Examination Certificate. This allows the
Timer or Clock to be adjusted and configured live
when installed in a Ex n panel enclosure located in
Zone 2.