DK32
Variable area flowmeter
with electrical built-ins
Equipment category II 2 G
DK32 DK34
DK32 DK34DK32 DK34
DK32 DK34
Supplementary instructions
Supplementary instructions Supplementary instructions
Supplementary instructions
© KROHNE 11/2012 - 4000422303 AD DK32/34 II2G R03 en
CONTENTS
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www.krohne.com 11/2012 - 4000422303 AD DK32/34 II2G R03 en
DK32 DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 Approval according to the IECEx scheme ........................................................................ 3
1.4 Security information......................................................................................................... 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 4
2.3 Marking............................................................................................................................. 4
2.4 Flammable products ........................................................................................................ 5
2.5 Equipment category .........................................................................................................5
2.6 Types of protection ........................................................................................................... 5
2.7 Ambient temperature / temperature classes.................................................................. 6
2.8 Electrical data................................................................................................................... 7
3 Installation 8
3.1 Installation........................................................................................................................ 8
4 Electrical connections 9
4.1 General notes ................................................................................................................... 9
4.2 Earthing and equipotential bonding ............................................................................... 10
5 Operation 11
5.1 Start-up........................................................................................................................... 11
5.2 Operation ........................................................................................................................ 11
6 Service 12
6.1 Maintenance ................................................................................................................... 12
6.2 Dismantling .................................................................................................................... 12
7 Notes 13
SAFETY INSTRUCTIONS 1
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DK32 DK34
www.krohne.com11/2012 - 4000422303 AD DK32/34 II2G R03 en
1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with electrical built-ins and the marking II 2 G. They complement the Installation and Operation
Instructions for the non-explosion protected versions.
The information given in these Instructions contains only the data relevant to Category 2
explosion protection. The technical details given in the Installation and Operation Instructions for
the non-explosion protected versions apply unchanged unless excluded or superseded by these
Instructions.
1.2 EC conformity
The manufacturer declares with the EC Declaration of Conformity on his own responsibility
conformity with the protection goals of Directive 94/9/EC for use in hazardous areas with gas.
The EC Type Examination Certificate of the Physikalisch Technische Bundesanstalt (PTB) forms
the basis of the EC Declaration of Conformity:
If required the EC Type Test Certificate can be downloaded under www.krohne.com.
1.3 Approval according to the IECEx scheme
Conformity with IECEx standards was tested in accordance with the IECEx Certification Scheme
for Explosive Atmospheres as per IEC 60079-0 and IEC 60079-11. The number of the IEC
certificate is:
1.4 Security information
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
PTB 99 ATEX 2191
PTB 99 ATEX 2191PTB 99 ATEX 2191
PTB 99 ATEX 2191
IECEx PTB 09.0025
IECEx PTB 09.0025IECEx PTB 09.0025
IECEx PTB 09.0025
CAUTION!
The operator respectively his agent is responsible to follow further standards, directives or laws
if required due to operating conditions or place of installation. This applies particularly for the
use of easy detachable process connections such as SMS or Clamp when measuring flammable
mediums.
2 DEVICE DESCRIPTION
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DK32 DK34
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2.1 Device description
Variable area flowmeters measure and display the volume flow of flammable and non-
flammable gases and liquids. The display houses one or two separately adjustable electrical
limit switches.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
2.3 Marking
The type marking of the instrument is realized visibly with the rating plate shown below. The
interior of the display has an additional marking with the serial number (P/A).
1 32 - with valve and horizontal connection / 34 without valve and vertical connection
2 RE - inlet pressure regulator / RA - outlet pressure regulator
3 K1 - one limit switch / K2 - two limit switches
4 S - plug connector / L - cable gland incl. cable
5 HT - high-temperature version
6 A - Limit switch tested for EC type approval or IECEx tested
7 Ex - Explosion-protected equipment
1 Device type
2 Manufacturer
3 Notified ATEX body
4 PED data
5 Sizing data: temperature & pressure rating
6 Ex-data according to PTB 99 ATEX 2191 and IECEx PTB 09.0025
7 Built-in equipment
8 Note manual
9 KROHNE website
DEVICE DESCRIPTION 2
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DK32 DK34
www.krohne.com11/2012 - 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 GbII 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 GbEx 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
2
22
2 Device category 2
G
GG
G Gas explosion protection
ia
iaia
ia Intrinsic Safety type, protection level “ia“
IIC
IICIIC
IIC suitable for gas group IIC, IIB and IIA
T6
T6T6
T6 suitable for temperature class T6 ... T1
Gb
GbGb
Gb EPL, suitable for zone 1
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