DRAFT - 20 November 2014
DRAFT - 20 November 2014
8
INM 660 rev 14
5 MAINTENANCE
5 .1 General directions
•
Mounting, electrical installation, start-up and maintenance of
the instrument may only be carried out by trained personnel
authorised by the operator of the facility. Personnel must read
and understand this Operating Manual before carrying out its
instructions.
• The MTL661/2/3/5 displays may only be operated
by personnel who are authorised and trained by
the operator of the facility. All instructions in this
manual are to be observed.
• Ensure that the measuring system is correctly wired up
according to the wiring diagrams. Protection against
accidental contact is no longer assured when the housing
cover is removed or the panel cabinet has been opened
(danger from electrical shock). The housing may only be
opened by trained personnel.
• Take careful notice of the “Safety rules,
instructions and precautionary measures“ in the
front of this manual.
The MTL661/2/3/5 displays do not require special maintenance unless
they are used in low-temperature applications or in surroundings
with high humidity (i.e. above 90% of the annual mean). It is the
users responsibility to take precautions to dehumidify the internal
atmosphere of the MTL661/2/3/5 in such a way that no condensation
will occur, for example by placing a sachet of dry silica-gel crystals in
the casing just before closing it. Furthermore, it is required that the
silica- gel be replaced or dried periodically as advised by the silica-gel
supplier.
Check periodically:
•
The condition of the casing, cable glands and front panel.
•
The input/output wiring for reliability and ageing
symptoms.
•
The process accuracy. As a result of wear and tear,
re-calibration of the sensor might be necessary. Do not
forget to re-enter any subsequent Span alterations.
•
Clean the casing with soapy-water. Do not use any
aggressive solvents as these might damage the coating.
6 ATEX INFORMATION
The Essential Health and Safety Requirements (Annex II) of the EU
Directive 2014/34/EU [the ATEX Directive - safety of apparatus] requires
that the installation manual of all equipment used in hazardous areas
shall contain certain information. This annex is included to ensure that
this requirement is met. It compliments the information presented in
this document and does not conflict with that information. It is only
relevant to those locations where the ATEX Directives are applicable.
6 .1 General
a) This equipment must only be installed, operated and
maintained by competent personnel. Such personnel shall have
undergone training, which included instruction on the various
types of protection and installation practices, the relevant rules
and regulations, and on the general principles of area
classification. Appropriate refresher training shall be given on a
regular basis. [See clause 4.2 of EN 60079-17].
b) This apparatus has been designed to meet the requirements of
Intrinsically safe apparatus in accordance with EN 60079-0 and
EN 60079-11 and is normally mounted in the hazardous area.
c) This apparatus has been designed and manufactured so as to
provide protection against all the relevant additional hazards
referred to in Annex II of the directive, such as those in clause
1.2.7.
6 .2 Installation
a) The installation must comply with the appropriate European,
national and local regulations, which may include reference to
the CENELEC code of practice EN 60079-14. In addition,
particular industries or end users may have specific
requirements relating to the safety of their installations and
these requirements should also be met. For the majority of
installations the Directive 1999/92/EC [the ATEX Directive - safety
of installations] is also applicable.
b) This is IS apparatus and is normally mounted in a hazardous area. It
meets the requirement of Category 1 apparatus and may be
installed in a Zone 0 location, provided that the relevant installation
requirements are met.
c) Unless already protected by design, this equipment must be
protected by a suitable enclosure against:
i) mechanical and thermal stresses in excess of those noted in
the certification documentation and the product specification
ii) aggressive substances, excessive dust, moisture and other
contaminants.
Read also the Special Conditions for Safe Use (below) for any ad-
ditional or more specific information.
Special Conditions of Safe Use
General
When the enclosure of the indicator is made of aluminium
alloy, when used in a potentially explosive atmosphere
requiring apparatus of equipment category 1G, the indicator
shall be installed so that, even in the event of rare incidents,
an ignition source due to impact or friction sparks between the
enclosure and iron/steel is excluded.
MTL66x(B)-NA Zone 2
When several apparatus are installed in the same panel or
enclosure, care must be taken that the surface termperature
of any of those installed apparatus does not rise above the
maximum surface temparature stated in the apparatus’
certificate. The displays shall also be installed in such a way
that the risk of mechanical damage is low.
6 .3 Inspection and maintenance
a) Inspection and maintenance should be carried out in
accordance with European, national and local regulations
which may refer to the IEC standard IEC 60079-17. In
addition specific industries or end users may have specific
requirements which should also be met.
b) Access to the internal circuitry must not be made during
operation.
c) If the outer enclosure of the apparatus needs to be cleaned,
this should be done with a cloth lightly moistened by a
dilute mixture of detergent in water.
6 .4 Repair
a) This product cannot be repaired by the user and must
be replaced with an equivalent certified product. Repairs
should only be carried out by the manufacturer or his
authorised agent.
6 .5 Marking
a) The products are labelled in a manner reproduced on
the following two pages. The serial number and date of
manufacture are programmed into the apparatus (see
Figure 16) and a printed date-mark is provided inside the
unit. This manual applies to products manufactured and
date marked during or after the year 2009.
Figure 16:
Display showing date and serial number
