MIVI Technical Manual
REF: 379/4 8
Note: In order to protect the inner part of the sensor (body + flexible conduit) during transportation,
we use a black silicone tape to cover the NPT joint’s end. This has nothing to do with a FM approved
protection and shall be removed while being installed on site.
Hereunder are some features of the conduit seals to be installed.
EYS and EZS sealing fittings:
Restrict the passage of gases, vapors, or flames from one portion of the electrical
installation to another at atmospheric pressure and normal ambient tempera-
tures.
Limit explosions to the sealed-off enclosure.
Prevent pre-compression or “pressure piling” in conduit systems.
While not an NEC requirement, many engineers consider it good practice to sectionalize long con-
duit runs by inserting seals not more than 50 to 100 feet apart, depending on the conduit
size, to minimize the effects of “pressure piling.”
Sealing fittings are required:
at each entrance to an enclosure housing an arcing or sparking device when used
in Class I, Division 1 and 2 hazardous locations. To be located as close as practica-
ble and, in no case, more than 18" from such enclosures. The enclosure's installa-
tion instructions may specify a distance less than 18";
at each entrance of 2" size or larger to an enclosure or fitting housing terminals,
splices, or taps when used in Class I, Division 1 hazardous locations. To be located
as close as practicable and, in no case, more than 18" from such enclosures;
in conduit systems when leaving the Class I, Division 1 or Division 2 hazardous
locations;
where cables terminate at enclosures that are required to be explosion proof;
where cables leave Class I, Division 1 locations and where they leave a Class I, Di-
vision 2 location if they are attached to process equipment that may cause a pres-
sure of over 6 in. of water to be exerted on a cable end.
1.4.4
ATEX and IEC Ex intrinsic safety certification
Marking is
II 1G Ex ia IIC T6 to T1 Ga
(*) Tamb(*) see tables APPENDIX C
MIVI sensors are in agreement with ATEX directive 2014/34/EU and the associated standards
EN 60079-0 (2012) / A11 (2013), EN 60079-11 (2012), but also with the IEC 60079-0:Ed6.0 (2011)
and the IEC 60079-11:Ed6.0 (2011).
Be sure the sensor’s certification is in accordance to the security level required on your process
location: area classification, equipment group, protection method, gas type, temperature
codes…
To always keep the maximum security level, the proper functioning and the warranty, do not open
it.
Check as often as possible that the information indicated on the sensor’s identification plate is still
visible.
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