KROHNE H250 M40 ATEX II3G Ex nA EN - Manual (Page 18)

5
OPERATION
18
H250 M40
www.krohne.com 01/2012 - 4001485201- MA H250/M40-Ex-II3G-AD R01 en
Operation
5.1 Start-up
Start-up is only permitted when the variable area flowmeter:
• is correctly installed in the system and connected.
• has been checked for the proper state with regard to its installation and connection
requirements.
• has been properly sealed in the electronic compartment or there is no explosive atmosphere
present.
The user of the system must have it checked before start-up in compliance with the national
regulations for checks before startup.
If the device needs to be configured due to the existence of an explosive atmosphere, this can be
done using the supplied programming magnets. There is no need to open the housing as it can
be done through the glass window of the electronics compartment or digitally via the signal
output (HART
® interface)
5.2 Operation
Variable area flowmeters must be operated in such a way that they remain within the maximum
and minimum permissible temperatures and pressures and the electrical limit values.
Variable area flowmeters may only be operated if the equipment parts necessary for safety are
effective in the long run, and are not rendered inoperable during operation.
During operation it is only permitted to open the indicator if no explosive atmosphere is present.
5.3 Electrostatic charge
In order to avoid ignition hazards due to electrostatic charge, variable area flowmeters
may not be used in areas where the following appear:
• processes that generate large charges,
• machines with friction and cutting processes,
• spraying of electrons (e.g. in the vicinity of electrostatic painting systems),
WARNING!
Ignition risks caused by pressure surges, impact or friction must particularly be avoided when
titanium measuring units are used.
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