OPERATION
5
13
H250 M10
www.krohne.com
06/2012 - 4001058901- MA H250/M10-Ex-II2G-AD R02 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.
•
and the electronics compartment have been properly closed (pressure-resistant casing) 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
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.
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 (protection type flameproof enclosure) in
hazardous areas is only permitted in a de-energised state and after complying with the waiting
time. The waiting time (8 minute) only applies to temperature classes T6 and T5.
CAUTION!
Ignition risks caused by pressure surges, impact or friction must particularly be avoided when
titanium measuring units are used.
AD_H250_M10_II2G_R02_en_058901_PRT.book Page 13 Tuesday, June 26, 2012 7:20 AM