KROHNE DK 32-DK 34 ATEX II2G Ex i EN - Manual (Page 5)

DEVICE DESCRIPTION
2
5
DK32 DK34
www.krohne.com 11/2012 - 4000422303 AD DK32/34 II2G R03 en
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. The following values define it
T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar.
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Installation condititions: Installation condititions: Installation condititions: Installation condititions:
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.
2.5 Equipment category
The flowmeters are designed in Category II 2G according to EN 60079-0 and EN 60079-11 for use
in Zone 1.
2.6 Types of protection
The variable-area flowmeter is designed in Intrinsic Safety type of protection, protection level
“
ia“ according to EN 60079-11.
The marking refering to ATEX is: II 2G Ex ia IIC T6 Gb II 2G Ex ia IIC T6 Gb II 2G Ex ia IIC T6 Gb II 2G Ex ia IIC T6 Gb
The marking refering to IECEx is: Ex ia IIC T6 Gb Ex ia IIC T6 Gb Ex ia IIC T6 Gb Ex ia IIC T6 Gb
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
for ensuring that the flowmeter is operated safely as regards 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
-8 S/m, in order to
avoid the electrostatic charge.
The marking contains the following information: The marking contains the following information: The marking contains the following information: The marking contains the following information:
II IIII II Explosion protection Group II
2222 Device category 2
G G G G Gas explosion protection
ia ia ia ia Intrinsic Safety type, protection level “ia“
IIC IIC IIC IIC suitable for gas group IIC, IIB and IIA
T6 T6 T6 T6 suitable for temperature class T6 ... T1
Gb Gb Gb Gb EPL, suitable for zone 1
AD_DK32_34_II2G_R03_en_422303_PRT.book Page 5 Monday, November 12, 2012 9:18 AM