Supplementary instructions
Supplementary instructions
DK32 DK34
DK32 DK34
DK32 DK34DK32 DK34
Supplementary instructions Supplementary instructions
Variable area flowmeter
with electrical built-ins
Equipment category II 3 G
Equipment category II 3 G
Equipment category II 3 GEquipment category II 3 G
© KROHNE 03/2013 - 4002148602 AD DK32/34 II3G R03 en
CONTENTS
DK32 DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 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 Protection types................................................................................................................ 6
2.7 Ambient temperature / temperature classes.................................................................. 7
2.8 Electrical data................................................................................................................... 8
3 Installation 9
3.1 Special conditions............................................................................................................. 9
3.2 Installation........................................................................................................................ 9
4 Electrical connections 10
4.1 General notes ................................................................................................................. 10
4.2 Earthing and equipotential bonding ............................................................................... 11
5 Operation 12
5.1 Start-up........................................................................................................................... 12
5.2 Operation ........................................................................................................................ 12
5.2.1 Operation as intrinsically safe equipment "ic"..................................................................... 12
5.2.2 Operation as non-sparking equipment "nA" ........................................................................ 12
6 Service 13
6.1 Maintenance ................................................................................................................... 13
6.2 Dismantling .................................................................................................................... 13
7 Notes 14
2
www.krohne.com 03/2013 - 4002148602 AD DK32/34 II3G R03 en
DK32 DK34
1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with electrical built-ins and the marking II 3 G. They complete the installation and operation
instructions for the non-explosion protected versions.
The information given in these instructions contains only the data relevant to category 3
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 assessment was made according to Directive 94/9/EC, Annex VIII (module "Internal control
of production"), and is registered company-internal under KMT-TDZ-A0121X. This registration
number is also provided on the nameplate.
SAFETY INSTRUCTIONS 1
1.3 Security information
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
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.
www.krohne.com03/2013 - 4002148602 AD DK32/34 II3G R03 en
3
2 DEVICE DESCRIPTION
2.1 Device description
Variable area flowmeters measure and display the volume flow of flammable and nonflammable 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:
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
DK32 DK34
* positions which are not needed are omitted (no blank positions)
2.3 Marking
The marking of the entire device is on the display, where the following identification plate can be
found. An additional marking is located on the inside of the display with the serial number (SN or
P/A number).
1 Device type
2 Manufacturer
3 PED data
4 Sizing data: temperature & pressure rating
5 Ex data
6 Built-in equipment
7 Note manual
8 KROHNE website
4
www.krohne.com 03/2013 - 4002148602 AD DK32/34 II3G R03 en
DK32 DK34
2.4 Flammable products
Atmospheric conditions
Atmospheric conditions
Atmospheric conditionsAtmospheric 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
-4°F...140°F and P
behaviour for most mixtures.
Operating conditions
Operating conditions
Operating conditionsOperating 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.
CAUTION!
Operation with flammable products is only permissible if no explosive fuel/air mixture is formed
on the interior of the flowmeter under operating conditions. The user is responsible for the safe
operation of the flowmeter with regard to the temperatures and pressures 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.
atm
DEVICE DESCRIPTION 2
= -20°C...+60°C /
atm
= 0.8...1.1bar. Outside of this range, no key data are available as to ignition
2.5 Equipment category
The flowmeters are designed in category II 3G according to EN 60079-0, EN 60079-11 and EN
60079-15 for use in zone 2.
INFORMATION!
Definition of Zone 2 according to EN 1127-1, Appendix B:
An area in which an explosive atmosphere as a result of the mixture of flammable substances in
the form of gas, steam or mist with air is not expected to occur under normal operation. If,
however, such an atmosphere does occur it only lasts for a brief period of time.
For more information see the chapter entitled "Flammable products".
www.krohne.com03/2013 - 4002148602 AD DK32/34 II3G R03 en
5
Loading...