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ATEX CERTIFICATE (if applicable)
This series of devices are certified according to the European normative ATEX
(94/9/EC). They have been designed and built to be used in environments considered
potentially explosive because of combustible gas or dust suspended in the air.The
degree of protection offered against the dangers of explosion is shown in the CE-ATEX
labeled on the instrument.
Naturally, due to the importance of safety, it is essential and mandatory by law,
that all the involved people (manufacturer of the instrument, designers and
builders of the plant, installation technician, end user, maintenance man, etc.) is
aware of the safety obligations and observes the mandated procedures.
It is necessary to carefully read this manual and to check that the characteristics
specified by the manufacturer are suitable to the environmental characteristics of
the plant where the instrument will be used. You need to read the instructions
related to the installation of the instrument to ensure its correct use during its
working life and to understand the correct procedures in case of failure and/or
maintenance. These instructions are reported in the specified chapter of this
manual.
Every Cyclic Timer supplied by Autel s.r.l. is equipped with a CE-ATEX certificate of
conformity, with this manual and a nameplate conforming to the 94/9/EC directive that
carries the ATEXmark.
The marking of this instrument is:
II 3D Ex mD IP65 A22 T 90°C
II 3G Ex mb IP65 T5
Simplifying, we can say that this mark means that this device has been designed to
operate in a potentially explosive atmosphere caused by combustible dusts (D=dust)
and gases (G=gas) which will only occur rarely, for short intervals of time during
operation (operation in zone 22 / zone 2) and that the device is designed to offer a
normal level of protection under normal working conditions (no breakdowns). The
method of anti-explosion protection is identified by the letters "mib" meaning that
encapsulation with resin and a control device is used to limit the maximum surface
temperature.
It is guaranteed that the maximum surface temperature in every point of the enclosure,
even in the presence of a breakdown, doesn't overcome 90°C.
This data is important for plant designer, technician and maintenance man to determine
the maximum thickness of the layer of combustible dust and gas that is tolerable to
leave on the surface of the equipment before proceeding to clean it up.
Also they must check that the 90°C temperature level is less than 2/3 of the minimum
ignition temperature of the combustible dust or gas present in the plant that could
determine a potentially explosive atmosphere.
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