Mettler Toledo WMS Manual De Usuario página 5

Safety Notes
CAUTION
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Safety instructions regarding installation and operation in the Ex hazardous area, Zone 2
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Safety measures during operation in the Ex hazardous area, Zone 2
The instrument must only be cleaned with a damp cloth.
Note
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Special conditions X for the WMS weigh module
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Technical data of the WMS weigh module in Ex Zone 2 see Additional Technical Data for
Ex Zone 2 WMS Weigh Module.
Weigh Modules
The weigh modules may only be connected to DC power sources that meet the 12-24
volt nominal range (10-29 V DC) at all times.
The power supply must be approved by the respective national test center of the country
in which the weigh module will be used.
The installation may be performed only by a qualified electrician as described in this
installation information.
Check whether special clothing or special tools are needed for work in the hazardous
area of the end-user and then wear or use these if required.
Find out whether the use of certain electronic devices (cell phones, computers, etc.) is
prohibited in the hazardous area of the end-user, and then follow these regulations.
Establishing and separating the connections to the power supply are exclusively the
task of the electrician(s) of the end user.
Any modifications, as well as repairs to the assemblies, are prohibited. These actions
endanger the safety of the system, result in loss of the Ex Approval, and nullify any
warranty and product liability claims.
Service work and repairs may be performed only by personnel authorized by METTLER
TOLEDO.
The classification as zone 2 must be confirmed by the regulatory body of your
profession.
Check that the weigh module is in perfect condition before putting into operation for the
first time and at least every 3 years.
It is important to observe the European Directive on Equipment Intended for Use in
Potentially Explosive Atmospheres (94/9/CE)!
Only accessories which are explicitly mentioned in this document may be used, and
they must be installed and operated as described here.
Installation work on the weigh module must be carried out outside the hazardous area.
According to Directive 94/9/EU (ATEX 95), WMS weigh modules are Group II, Category
3G devices that, according to Directive 99/92/EU (ATEX 137), can be used in Zone 2,
Gas Groups IIA, IIB and IIC, which are potentially ignitable by combustible substances
in the Temperature Classes T6.
For use/installation, the requirements of EN 60079-14 must be observed.
WMS weigh modules can only be used in closed and clean interior spaces.
The instrument must only be cleaned using a damp cloth.
Only weighing platforms fixed with an eccentric pin are allowed to be used.
External connector: Do not separate when energized! In order to prevent unintentional
disconnection, the external connector must be fully inserted and the retaining ring fully
tightened prior to energizing and using the weigh module!
The connector must be effectively protected against impacts!
Safety Information 5