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DEVICE DESCRIPTION
2
2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:
Atmospheric conditions:
Atmospheric conditions:
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions. It is defined by the following values T
-4...+140°F and P
available for the ignition behaviour.
Operating conditions:
Operating conditions:
Operating conditions:
Operating conditions:
Variable area flowmeters operate outside of atmospheric conditions, which means that
explosion protection according to directive 94/9/EC (ATEX) – regardless of the zone assignment
– is fundamentally not applicable due to the lack of key safety data for the interior of the
measuring section.
WARNING!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. The operator is responsible
to ensure that the flowmeter is operated safely in terms of the temperature and pressure of the
products used. In case of operation with flammable products the measuring units must be
included in the periodic pressure tests of the system. When using the device version H250/C...
(PTFE-liner, nonconductive) the min. conductivity of the medium must be 10
avoid the electrostatic charge.
2.5 Equipment category
The flowmeters are designed in category II 3G according to EN 60079-0 and EN 60079-15 and
category II 3D according to EN 60079-31 for use in hazardous areas, zone 2 and zone 22.
6
= 0.8...1.1 bar. Outside of this range, for most mixtures no key figures are
atm
www.krohne.com
= -20...+60°C /
atm
-8
S/m, in order to
04/2015 - 4000646002 MA H250/M9-Ex-II3GD-AD-R06-en
H250 M9
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