KROHNE BW 25 Ex II 1-2 G EN - Manual (Page 8)

2
DEVICE DESCRIPTION
8
BW25
www.krohne.com 03/2010 - 4000862901 MA BW25-Ex-II1/2G-AD R01 en
2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, level meter with built-in electrical equipment
(electric variants) are not assigned to any fixed temperature class. The temperature class of
these devices is rather a function of the product temperature and ambient temperature that is
present and the specific device version. Please see the following tables for the assignments.
The tables take into account the following parameters:
• Installed equipment
• Maximum values P
i
for K1, K2, ESK
• Ambient temperature T
amb.
• Product temperature T
m
• Standard or high temperature version (HT)
• Heat resistance of the connecting cable
When there is more than type of built-in equipment, the data of the most unfavourable
equipment should be used.
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
• The measuring device is installed and operated in accordance with the installation
instructions.
• It must be ensured that the flowmeter is not heated by the effects of additional
heat radiation (sunshine, neighbouring system components) and
thus operated above the permissible ambient temperature range.
• Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.
To do this, the variant with a projecting indicator (HT version) is preferable.
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