DEVICE DESCRIPTION 2
15
VA FLOWMETERS
www.krohne.com09/2022 - 4000419908 - AD VA Mech Ex Gb-Db R08 en
2.8 Surface temperature
It is to be assumed that a combustible fuel / air mixture can be in contact with the outer wall of
the measuring tube and process connections. Any temperature gradient between the internal
wall in contact with the product (product temperature) and the outer surface is not taken into
consideration.
The actual maximum surface temperature does not depend on the device itself, but instead on
the o
perating conditions. The device itself does not generate heat and, for this reason, the
surface temperature is determined by the product temperature and, in versions with heating
jackets, by the heating medium temperature as well.
The nameplate shows the maximum values of the temperature classes and the maximum
surfa
ce temperature. Depending on the device version, these values may not be reached.
The maximum permitted ambient and product temperatures can be found in the standard
manua
l.
VA40 T6 T185°F -20...+185 -20...+185
T5 T212°F -20...+212 -20...+212
GA24 T6 T185°F -20...+185 -40...+185
T5 T212°F -20...+212 -40...+212
T4 T248°F -40...+248
Table 2-5: Temperature class and surface temperature in °F
Device type Temp.
class
Surface
temperature
Maximum permissible
Ambient temperature
in °F
Product temperature
in °F
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