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Safety
Leuze electronic
CML 720i Ex
11
Prerequisites for competent persons:
• They have a suitable technical education.
• They are familiar with the rules and regulations for occupational safety and safety at work.
• They are familiar with the original operating instructions of the device.
• They have been instructed by the responsible person on the mounting and operation of the device.
Certified electricians
Electrical work must be carried out by a certified electrician.
Due to their technical training, knowledge and experience as well as their familiarity with relevant stan
-
dards and regulations, certified electricians are able to perform work on electrical systems and indepen
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dently detect possible dangers.
In Germany, certified electricians must fulfill the requirements of accident-prevention regulations BGV A3
(e.g. electrician foreman). In other countries, there are respective regulations that must be observed.
2.4
Exemption of liability
Leuze electronic GmbH + Co. KG is not liable in the following cases:
• The device is not being used properly.
• Reasonably foreseeable misuse is not taken into account.
• Mounting and electrical connection are not properly performed.
• Changes (e.g., constructional) are made to the device.
2.5
Notices for the safe use of sensors in potentially explosive areas
These notices apply for devices with the following classification:
Table 2.1:
Classification of the devices
Installation and Commissioning
Only have the devices installed and commissioned by certified electricians.
The certified electricians must be knowledgeable of the regulations and the operation of explosion-proof
equipment.
Prevent unintended disconnection while under voltage.
Devices with connector must be equipped with a safeguard or a mechanical interlocking guard; see
table 17.9.
Attach the warning sign “Do not disconnect under voltage” that is supplied with the device to the sensor
or the mounting bracket so that it is clearly visible.
Device group
Device category
Equipment protection
level
Zone
II
3G
Gc
2 (gas)
II
3D
Dc
22 (dust)
WARNING
Safe use of sensors in potentially explosive areas!
Check whether the device classification corresponds to the requirements of the application.
A safe operation is only possible if the devices are used properly and for their intended purpose.
The devices are not suited for the protection of persons and may not be used for emergency shutdown
purposes.
Electrical devices may endanger humans and (where applicable) animal health, and may threaten the
safety of goods if used incorrectly or under unfavorable conditions in potentially explosive areas.
Observe the applicable national regulations (e.g., EN 60079-14) for the configuration and installation
of explosion-proof systems.