Heinrichs Messtechnik GmbH
Ex- Supplement operating manual V31
Page
9 of 12
4.6
Installation conditions
For the Ex- version of the V31, the same installation conditions are valid as described in the operating instruction
of the standard instrument.
It hast to be insured by the operator that maximum ambient- and fluid temperature of the instrument does not
exceed the prevailing temperature class of the hazardous area.
The maximum permissible temperature is indicated on the label.
In addition the operator is to consider the dangers presented by hot surfaces in accordance with the requirements
of EN 1127-1:2019 (Explosion protection
–
Principles and Methods) paragraph 5.1 and 6.4.2.
4.7
Marking
4.7.1
Without electrical equipment
In the basic version the flow meter is a
non- electrical equipment
under intended operation without own sources of
ignition and complies with the requirements of DIN EN ISO 80079-36 and can be used in hazardous areas requiring
instruments of category 2.
Marking:
Type: V31 Heinrichs Messtechnik GmbH, 50739 Köln
II 2G Ex h IIC TX Gb
II 2D Ex h IIC TX°C Db
Reg. No.: BVS 10 ATEX H/B 119
Tamb -
20°C…+80°C
4.7.2
With external mounted limit switches
The Variable Area Flow Meter can be equipped with external limit switches. These limit switches must possess
either:
-
an own Type examination certificate according to EN 60079 ff or
-
they must meet the requirements of „simple apparatus“
according
EN 60079-11 / 5.7
The Ex marking is printed on the name plate of each switch.
Caution:
The influence of the fluid temperature on the installed switch must be considered.
