REV 0, June 2005 Page 89
Operation Manual SUPREMA
5. Installation
5. Installation
5.1 General Information
5.1.1Installation Instructions for Following the EMC Directives
The devices of MSA have been developed and tested in accordance with the EMC Directives
89/336/EEC, 91/263/EEC, 92/31/EEC, and 93/68/EEC and the corresponding standards EN
50270. The requirements of the EMC Directives can only be met by following the manufacturer’s
installation instructions.This applies only to tested devices and systems of the manufacturer.
General Instructions on the Installation of Tested Devices and Systems of MSA AUER
GmbH to ensure that the EMC Directives are followed
• For the connection of the various devices to the power supply system a fault-free ground
or fault-free equipotential bonding must be provided
• An appropriate supply voltage free of feedback to the external source in accordance with
the EMC Directives must be used.
• If the devices are supplied from a direct voltage (dc) source, the supply cable must be
screened.
• Screened cable is to be used to connect the sensors.
• Control cables must be screened (reset, acknowledge, measurement current output,
printer, etc.).
• Screened cable must have at least 80 % coverage by the screening.
• Control and sensor cables must be laid physically apart from power supply
cables.
• Screened cables must be laid in one piece. If it should prove necessary to extend a cable
by way of a terminal box, the terminal box must be screened, and the connections in the
box must be kept as short as possible.
• Unscreened cables and cables from which the insulation has been stripped must be as
short as possible and must be laid without loops to the appropriate terminal posts.
• External devices that are operated by the gas warning units (horns, contactors, pumps,
motors, etc.) must be radio-screened and follow the EMC Directives.
• If the EMC filters of the device are physically remote, the power supply cable between
the filter and the device must be screened.
• If additional high-voltage surge protection measures are required an appropriate high-
voltage protection filter, approved by MSA AUER GmbH, must be installed in the sensor
cable.
5.1.2Instructions on Meeting the EMC Requirements on the SUPREMA
Control System
To meet the EMC product standard EN 50270 (Electromagnetic Compatibility. Electrical
apparatus for the detection and measurement of combustible gases, toxic gases or oxygen),
the following points must be observed:
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