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14 Safety Instructions ( ATEX )
14.1 Area of validity
These security instructions apply to MM...E series magnetic level sensor for use in
explosion-proof atmospheres conforming to certificate LOM 06ATEX2054 X and
MM...F series conforming to CE certificate LOM 14ATEX2075 X
14.2 Guidelines.
These security instructions must be applied to the MM...E and MM...F series used in
gas explosion hazard environments.
It is necessary to follow carefully the instructions from the hazardous areas where the
MM...E or MM...F will be installed, as well as the safety instructions included in this
manual.
In models with transmitter and/or display the intrinsically safe specific parameters
are:
Ci total: Ci (sensor) + Ci (transmitter) + Ci ( display)
Li total: Li (sensor) + Li (transmitter) + Li ( display)
It must be considered the minimum value of Pi, Ii and Ui in all components used in the
assembly.
Temperature class and/or surface temperature relates solely to a device operated at
ambient temperature. On installation, the actual temperature class for process
operation has to be determined.
The maximum temperature in the enclosure head depends on the process
temperature and may not exceed the maximum service temperature indicated for the
junction box for the instruments MM...F series.
The guide tube must be mechanically protected or in locations with low risk of impact
for the instruments MM...F series.
When the tank inside is a zone 0, a degree of protection at least IP67 must be
ensured in the process connection for the instruments MM...F series.
Inlet bushing and cable glands must conform to the certification for their type in
accordance with the directive.
Models with cable must be protected with an external enclosure having at least a
degree of protection IP20 for MM...E series.
The use in zone 0 of heads made of aluminium should be restricted to locations
where the risk of ignition due to mechanical impact is not possible.
page 11
MM series
DT0593
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