KROHNE H250 M10 ATEX II3D Ex t EN - Manual (Page 12)

5
OPERATION
12
H250 M10
www.krohne.com 03/2011 - 4001348101- MA H250/M10-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.
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 dust 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),
• dust carried by compressed air.
AD_H250_M10_II3D_R01_en_4001248101_PRT.book Page 12 Wednesday, March 30, 2011 11:44 AM