KROHNE OPTISWIRL 4070 ATEX II2G EN - Manual (Page 16)

5
OPERATION
16
OPTISWIRL 4070
www.krohne.com 04/2013 - 4000077105 MA OPTISWIRL4070 II2G AD R05 en
Operation
5.1 Start-up
Start-up may only commence when the vortex flowmeter:
• is correctly installed in the system and connected.
• has been checked for the proper state with regard to its installation and connection
requirements.
• and the electronics compartment have been properly closed (flameproof enclosure) and the
applicable special lock has been fitted.
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
Vortex 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.
Vortex 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.
When it comes to flammable products, the measuring sections must be included in the periodic
pressure tests of the system.
Opening the housing of the electronics compartment (type of protection: flameproof enclosure)
in hazardous areas is only permitted in a de-energised state and after complying with the waiting
time. The waiting time (1 minute) only applies to temperature classes T6 and T5.
Terminal compartments (type of protection: Intrinsic safety) may be opened even in an energised
state in hazardous area. Work on electrical connections (e.g. configuration via the HART
®
interface) is also permitted in an energised state. Terminal compartments must be closed
immediately upon completion of the work.
AD_OPTISWIRL4070_II2G_R05_en_077105_PRT.book Page 16 Tuesday, April 23, 2013 2:17 PM