Kobold NBK-ATEX, Operating Instructions Manual

Page: 13 / 57

NBK-03 to -33 ATEX
NBK-03 to -33 ATEX K10/0322 page 13
7.3 Safety Instructions
7.3.1 Area of validity
These safety instructions apply to MM…E Series of magnetic level switch for use in
explosion-proof atmospheres conforming to CE certificate LOM 06ATEX2054 X and
MM…F Series conforming to CE certificate LOM 14ATEX2075 X
7.3.2 Guidelines
These safety 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 and the safety regulations of the ATEX certificate (see appendix).
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 only to a device operated at
ambient temperature. On installation, the actual temperature class for process
operation has to be determined.
Inlet bushing and cable glands must conform to the certification for their type in
accordance with the directive.
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 probable.
Verify that all data written on the label of the device matches the data required for
the installation.
Verify that there is no mechanical stress or deformation due to installation in the
tank.
Remove power supply and verify that no explosion risk is present before opening
the housing cover and check that the cover is correctly mounted before applying
power to the instruments
MM…F Series.
The installation of instruments in hazardous areas must be exclusively done by
trained staff.