KROHNE DK32 Series Wiring diagram

Variable area flowmeter with electrical built-ins
Equipment category II 2 G
DK32-DK34
DK32-DK34DK32-DK34
DK32-DK34 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 08/2017 - 4000422304 - AD DK32-34 II2G R04 en

CONTENTS
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DK32-DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 Approval according to the IECEx scheme ........................................................................ 3
1.4 Safety instructions............................................................................................................ 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 Grounding 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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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 complete the standard manual for the non-
explosion protection versions.
The information given in these instructions contains only the data relevant to category 2
explosion protection. The technical details given in the standard manual for the non-explosion
protected versions remain unchanged unless they will be excluded or replaced by these
supplementary instructions.
1.2 EU conformity
The manufacturer declares with the EU declaration of conformity on his own responsibility
conformity with the protection goals of directive 2014/34/EU for use in hazardous areas with gas.
The EC type examination certificate of the Physikalisch Technische Bundesanstalt (PTB) forms
the basis of the EU declaration of conformity:
If needed the EC type examination certificate can be downloaded from the manufacturer's
website.
1.3 Approval according to the IECEx scheme
Conformity with IECEx standards was tested in accordance with the "IECEx Certification Scheme
for Explosive Atmospheres" acc. to IEC 60079-0 and IEC 60079-11. The number of the IEC
certificate is:
1.4 Safety instructions
If these instructions are not followed, there is a risk of explosion.
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 or his agent is responsible for observing any additional standards, directives or
laws if required due to operating conditions or place of installation. This applies in particular to
the use of easily detachable process connections when measuring flammable media.

2 DEVICE DESCRIPTION
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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 device is realised visibly with the nameplate 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, serial number and manufacturing date
2 Manufacturer
3 Identification number of the notified body ATEX
4 PED data
5 Rating data: temperature & pressure rating
6 Ex data according to PTB 99 ATEX 2191 and IECEx PTB 09.0025
7 Built-in equipment
8 Data matrix
9 Safety instructions and disposal symbol

DEVICE DESCRIPTION 2
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2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
Atmospheric conditions:
The ATEX directive does not stipulate values for atmospheric conditions. However, for
determining the explosion characteristic parameters of temperature and pressure range, the
following is assumed as a basis:
T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar / 11.6...15.9 psi
Outside of these ranges, for most mixtures no key figures are 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 the ATEX directive, regardless of the zone assignment, is
fundamentally not applicable due to the lack of key safety data for the interior of the measuring
unit.
2.5 Equipment category
The flowmeters are designed in category II 2 G 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 type of protection "intrinsic safety", protection level
"ia" according to EN 60079-11.
The marking according to ATEX is: II 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 GbII 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 Gb
The marking according to IECEx is: Ex ia IIC T6
Ex ia IIC T6Ex ia IIC T6
Ex ia IIC T6
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 version, non-conductive) the minimum conductivity of the media must be 10
-8
S/m, in
order to avoid danger from 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
2Equipment category 2
G
GG
GGas explosion protection
ia
iaia
ia Protection type intrinsic safety, protection level "ia"
IIC
IICIIC
IIC Suitable for gas group IIC, IIB and IIA
T6...T1
T6...T1T6...T1
T6...T1 Suitable for temperature class T6...T1
Gb
GbGb
Gb EPL, suitable for zone 1

2 DEVICE DESCRIPTION
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2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, variable area flowmeters with built-in electrical
equipment (electric variants) are not assigned to any fixed temperature class. The temperature
class of these devices is rather a function of the product temperature and ambient temperature
that is present and the specific device version. Please see the following tables for the
assignments.
The tables take into account the following parameters:
•Ambient temperature T
amb.
•Product temperature T
m
DK3./../.././../A–Ex permissible medium and ambient temperatures
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
• The measuring device is installed and operated in accordance with the installation
instructions in the manual.
• It must be ensured that the flowmeter is not heated by the effects of additional heat radiation
(sunshine, neighbouring system components) and thus operated above the permissible
ambient temperature range.
• Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.
Temperature
class
Ambient temperature Maximum permissible medium temperature
with connector (S) or cable gland (L)
Type DK32 Type DK34
[°C] [°F] [°C] [°F] [°C] [°F]
T6 -20...+40 -4...+104 75 167 80 176
-20...+50 -4...+122 70 158 70 158
-20...+60 -4...+140 60 140 60 140
T5 -20...+40 -4...+104 100 212 100 212
-20...+50 -4...+122 95 203 100 212
-20...+60 -4...+140 85 185 90 194
T4 -20...+40 -4...+104 135 275 135 275
-20...+50 -4...+122 130 266 135 275
-20...+60 -4...+140 120 248 130 266
-20...+90 -4...+194 90 194 90 194
T3...T1 -20...+40 -4...+104 135 275 150 302
-20...+50 -4...+122 130 266 140 284
-20...+60 -4...+140 120 248 130 266
-20...+90 -4...+194 90 194 90 194

DEVICE DESCRIPTION 2
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2.8 Electrical data
The electronic signal output may only be connected to intrinsically safe circuits. Depending on
the device design, the following maximum values apply per circuit:
Design DK3./../.././../A–Ex
Irrespective of the device design, the following values are to be observed for each intrinsically
safe circuit in case of interconnection:
U
i
16 VDC
I
i
25 mA
P
i
64 mW
C
i
150 nF
L
i
150 µH

3 INSTALLATION
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3.1 Installation
Installation and setup must be carried out according to the applicable installation standards
(e.g. EN 60079-14) by qualified personnel trained in explosion protection. The information given
in the manual and the supplementary instructions must always be observed.
Variable area flowmeters must be installed in such a way that
•there is no danger from mechanical impact effects.
•there are no external forces affecting the indicator part.
•the device is accessible for any visual inspections that are necessary, and can be viewed from
all sides.
•the nameplate is clearly visible.
•it can be operated from a location with secure footing.
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use other than the
intended purpose. This applies in particular to hazards due to insufficient corrosion resistance
and suitability of the materials in contact with product.

ELECTRICAL CONNECTIONS 4
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4.1 General notes
For version DK3./../../S/../A-Ex (plug), the separate intrinsically safe signal circuits with
protection level "ia" or "ib" are electrically connected in the terminal compartment of the plug
housing and for version DK3./../../L/../A-Ex (connecting cable) it is the connecting cable as
illustrated in the connection diagram. Permissible maximum values (electrical data) must be
observed.
Connecting cable
The connecting cables must be selected according to prevailing installation standards
(e.g. EN 60079-14). The outer diameter of the connecting cable must be within the sealing range
of the cable entry. The connecting cables must be fixed and laid so they are sufficiently protected
against damage.
All cores that are not used must be securely connected to the ground potential of the hazardous
area or carefully insulated against each other and against ground (test voltage ≥500 V
eff
).
Cable entries / blanking plugs
The DK3./../../S/../A-Ex variable area flowmeter is equipped with a connector. The connector
guarantees protection from foreign bodies and water (protection category) IP65 acc. to
EN 60529. The cable entry is closed with a plug. The plug is to be replaced with a suitable
connecting cable (nominal diameter range 6...9 mm).
Connection diagrams
Contact connection Cable colors of assembled cable
1Min minus white
2Min plus yellow
3Max minus green
4Max plus brown
5Lift slot
6Fastening screw of connection box

4 ELECTRICAL CONNECTIONS
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4.2 Grounding and equipotential bonding
If the device is not sufficiently electrostatically grounded via the process pipes, an additional
ground connection must be established using the grounding screw 1. The position of the ground
terminal is illustrated below. This connection only ensures electrostatic grounding of the device
and does not meet the requirements for equipotential bonding.
DK32 - DK34

OPERATION 5
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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.
The operator of the system has to check prior to start-up, if the start-up was in compliance with
the national regulations for checks.
5.2 Operation
Setting of the limit switches may be carried out during operation. To do so, remove the housing
cover. Close the housing cover immediately after the limit switches have been set.

6 SERVICE
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6.1 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular checks are required in order to maintain the proper
condition.
The following checks are recommended:
•Checking the housing, the cable entries and the feed lines for corrosion and/or damage.
•Checking the measuring unit and the piping connections for leakage.
The cover is to be closed following maintenance work on the indication unit.
6.2 Dismantling
Replacing the display
Due to the modular design of the variable area flowmeters, from a safety perspective the
complete display can be replaced with identical spare parts.
Exchanging the entire device
The dismantling and installation is within the responsibility of the operator.
Exchanging and dismantling should take place in a de-energised state, if at all possible. If that is
not possible, the basic conditions for intrinsic safety (e.g. no grounding or connection of different
intrinsically safe circuits to one another) must be observed during dismantling.
CAUTION!
There may be a loss of measuring accuracy!
CAUTION!
• Pressurised pipes have to be depressurised before removing the measuring unit.
• In the case of environmentally critical or hazardous products, appropriate safety precautions
must be taken with regard to residual liquids in the measuring unit.
• New gaskets have to be used when re-installing the device in the piping.

NOTES 7
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7 NOTES
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NOTES 7
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Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: [phone]
Fax: [phone]
[email protected]
© KROHNE 08/2017 - 4000422304 - AD DK32-34 II2G R04 en - Subject to change without notice.
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