KROHNE H250 M40 ATEX II2D Ex t-II2G Ex d EN - Manual (Page 10)

2
DEVICE DESCRIPTION
10
H250 M40
www.krohne.com 07/2012 - 4002069601 - MA H250/M40-Ex-II2GD-AD R01
Reference point observation Reference point observation Reference point observation Reference point observation
The permissible product and ambient temperatures may be exceeded or undershot as long as
the permissible temperature range of the reference point of the display is not exceeded. The
following table contains the permissible maximum values at the reference point. Note:
• Reference point is the connection of the equipotential bonding conductor of the M40 indicator.
• The temperatures at the reference point are to be determined in the most unfavourable
operating situation.
• The required measuring uncertainty is max. 2K.
• Measuring conditions and results are to be permanently recorded in a suitable format.
• The measuring unit should be insulated properly.
Maximum permitted temperatures at reference point
Maximum permitted temperature at the reference
point T
Ref
[°C]
Heating
jacket TK T6...T1 T6 T5...T1
none with T
Connecting cable
[°C] standard (70°C) Heat resistant (90°C)
DN15
DN25
DN50
DN80
DN100
DN15
DN25
DN50
DN80
64 74 84
Maximum permitted temperature at the reference
point T
Ref
[°F]
Heating
jacket TK T6...T1 T6 T5...T1
none with T
Connecting cable
[°F] standard (158°F) Heat resistant (194 °F)
DN15
DN25
DN50
DN80
DN100
DN15
DN25
DN50
DN80
147 165 183
AD_H250_M40_II2GD_R01_en_4002069601_PRT.book Page 10 Friday, July 27, 2012 8:17 AM