Elkron MEDEA, Installation Manual, Page: 12 / 96

10 MEDEA Installation Manual
Grade 4
High risk
To be used when security has the priority over all other factors. It is expected that
the intruders have the skills and resources to plan a detailed intrusion and have
a complete set of tools available, including the means for substituting components
of an intrusion alarm system.
This is indicated for particularly sensitive premises, for example, banks.
Table 1 - EN 50131-1 safety grades
IMPORTANT The overall grade of an intrusion alarm system is the one of its lowest grade
component.
EN 50131-1 requires that intrusion alarm system components to be suitable for use in one of the following
environmental classes:
Class I
Indoor
Environmental influences normally present in closed environments, when the
temperature is well-controlled (ex: in a residential or commercial property).
NOTE : The environment should not be subject to condensation and the
temperature should vary between +5°C and +40°C with an average relative
humidity of about 75%.
Class II
Indoor (general)
Environmental influences normally present in closed environments, when the
temperature has not been controlled (ex: in corridors, other spaces or stairways
where condensation may form on windows and in unheated areas used as a
deposit or in warehouses where heating is intermittent).
NOTE : The environment should not be subject to condensation and the
temperature should vary between -10°C and +40°C with an average relative
humidity of about 75%.
Class III
Outdoor (sheltered or
indoor extreme
conditions)
Indoor (extreme
conditions)
Environmental influences normally present outdoors when components of the
intrusion alarm system are not totally exposed to atmospheric agents or indoors,
when the environmental conditions are extreme.
NOTE : The environment should not be subject to condensation and the
temperature should vary between -25°C and +50°C with an average relative
humidity of about 75%.
For 30 days a year it is expected that the relative humidity will vary between 85%
and 95% without being subject to condensation.
Class IV
Outdoor (general)
Environmental influences normally present outdoors, when the components of the
intrusion alarm system are completely exposed to the elements.
NOTE : The environment should not be subject to condensation and the
temperature should vary between -25°C and +60°C with an average relative
humidity of about 75%.
For 30 days a year it is expected that the relative humidity will vary between 85%
and 95% without being subject to condensation.
Table 2 - Environmental Classes EN50313-1
EN 50131-1 establishes four levels of user access that define the ability of users to access system
components and controls:
Level 1 Access by anyone.
Level 2 Access by the user (e.g. an operator).
Level 3 Access by the maintainer.
Level 4 Access by the manufacturer.
Table 3 - EN50313-1 access level