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MI3 Rev. G Nov/2015 59
9.2 Intrinsic Safety
9.2.1 Sensing Heads
The sensing heads for the MI3, MI3xxLTH, and MI3100 series are available as intrinsic safety rated
sensing heads (…IS) intended for use in explosive atmospheres.
The sensing heads xxMI3xxxISx and xxxMI3100xxxISx follow the ATEX / IECEx certification in
accordance to:
II 2D Ex ib IIIC T135°C Db
The ambient temperature range for these sensing heads is specified as follows:
LT, G5 Ta= -10 to 120°C (14 to 248°F)
1M, 2M Ta= 0 to 120°C (32 to 248°F)
The intrinsically safe sensing heads 1M/2M are available with water cooled housing. The water cooled
housing can provide a cooler, more stable operating environment for the sensing head but does not
allow for approved intrinsically safe operation when external ambient conditions are exceeding the
ambient temperature ranges.
The sensing heads xxxMI3xxLTHISx follow the ATEX / IECEx certification in accordance to:
II 2D Ex ib IIIC T135°C/185°C Db
Ex ib IIIC T135°C / 185°C Db
The ambient temperature range for these sensing heads is specified as follows:
LTH sensing head Ta= -10 to 180°C (14 to 356°F)
Detached electronic unit Ta= -10 to 120°C (14 to 248°F)
For further information to relevant standards and the examination certificate, see section ATEX
Certificate of Conformity for Sensing Heads, page 132 or IECEx Certificate of Conformity for Sensing
Heads, page 138.
9.2.2 Ex Power Supply RAYMI3ACISx
The Ex Power Supply must be used to operate ATEX / IECEx certified sensing heads in hazardous
environments. The Ex Power Supply is installed in a non-hazardous area to supply power to
intrinsically safe sensing heads. The Ex Power Supply is to be ordered separately (RAYMI3ACISx).
The Ex Power Supply follows the ATEX / IECEx certification in accordance to:
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