KROHNE H250 M40 ATEX II3G Ex nA EN - Manual (Page 13)

DEVICE DESCRIPTION
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H250 M40
www.krohne.com 01/2012 - 4001485201- MA H250/M40-Ex-II3G-AD R01 en
Reference point consideration Reference point consideration Reference point consideration Reference point consideration
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 of indicator in °C
Design of
indicator Component Permitted temperature range at reference point T [°C] according to
temperature class
TK T6 T5 T4 ... T1
M40./../K. SC3,5-NO-Y -20 ... +65 -20 ... +80 -20 ... +90
SJ3,5-SN -20 ... +66 -20 ... +81 -20 ... +90
SJ3,5-S1N -20 ... +66 -20 ... +81 -20 ... +90
I7S23,5-N -40 ... +70 -40 ... +85 -40 ... +90
M40./../ESK4/K. SC3,5-NO-Y -20 ... +55 -20 ... +70 -20 ... +80
SJ3,5-SN -20 ... +55 -20 ... +70 -20 ... +80
SJ3,5-S1N -20 ... +55 -20 ... +70 -20 ... +80
I7S23,5-N -40 ... +55 -40 ... +70 -40 ... +80
M40./../ESK4 ESK4 -40 ... +55 -40 ... +70 -40 ... +80
M40./../ESK4-T ESK4 and I/O modul -40 ... +52 -40 ... +67 -40 ... +77
M40./../ESK4-FF ESK4 and ESK4-FF -40 ... +36 -40 ... +51 -40 ... +76
M40./../ESK4-PA ESK4 and ESK4-PA
AD_H250_M40_II3G_R01_en_4001485201_PRT.book Page 13 Tuesday, January 24, 2012 8:46 AM