KROHNE DK32 Series Wiring diagram

Variable area flowmeter with electrical built-ins
DK32 - DK34
DK32 - DK34DK32 - DK34
DK32 - DK34 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 02/2018 - 4002598202 - AD DK32/34 NEPSI Exi R02 en

CONTENTS
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DK32 - DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 NEPSI conformity ............................................................................................................. 3
1.3 Approval according to the IECEx scheme ........................................................................ 4
1.4 Safety instructions............................................................................................................ 4
2 Device description 5
2.1 Device description ............................................................................................................ 5
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 6
2.4 Flammable products ........................................................................................................ 7
2.5 Device category ................................................................................................................ 7
2.6 Protection types................................................................................................................ 8
2.7 Ambient temperature / temperature classes.................................................................. 9
2.8 Electrical data................................................................................................................. 10
3 Installation 11
3.1 Installation...................................................................................................................... 11
3.2 Special conditions and requirements ............................................................................ 11
4 Electrical connections 12
4.1 General notes ................................................................................................................. 12
4.2 Connection assignment.................................................................................................. 13
4.3 Grounding and equipotential bonding............................................................................ 13
5 Operation 14
5.1 Start-up........................................................................................................................... 14
5.2 Operation ........................................................................................................................ 14
6 Service 15
6.1 Maintenance ................................................................................................................... 15
6.2 Dismantling .................................................................................................................... 15

SAFETY INSTRUCTIONS 1
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1.1 General notes
These supplementary instructions apply to explosion-protected versions of variable area
flowmeters with electrical built-ins and the marking Ex i. It completes the standard
documentation for the non-explosion protected versions.
The information given in these instructions contains only the data relevant to explosion
protection. The technical details given in the standard instructions for the non-explosion
protected versions apply unchanged unless excluded or superseded by these supplementary
instructions.
1.2 NEPSI conformity
Variable area flowmeters, type DK32 series and DK34 series have been approved by NEPSI
(National Supervision and Inspection Center for Explosion Protection and Safety of
Intrumentation). This product is in accordance with the following standards:
•GB 3836.1-2010 Explosive atmospheres - Part 1: Equipment - General requirements
•GB 3836.4-2010 Explosive atmospheres - Part 4: Equipment protection by intrinsic safety "i"
The certificate number is:
This certification together with its boundary conditions is required to be observed without fail.
GYJ17.1478X
GYJ17.1478XGYJ17.1478X
GYJ17.1478X
INFORMATION!
The Ex marking is NOT according to the ATEX directive. Placing the product on the market of the
EU for purpose of distribution and/or use in the EU is NOT permitted.

1 SAFETY INSTRUCTIONS
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1.3 Approval according to the IECEx scheme
Conformity with IECEx standards was tested in accordance with the "IECEx Certification Scheme
for Explosive Atmospheres" according 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!
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.

DEVICE DESCRIPTION 2
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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)
Figure 2-1: Safety description code
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

2 DEVICE DESCRIPTION
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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).
Figure 2-2: Example of nameplate
1 Manufacturer name and address
2 Product designation
3 Sizing data: temperature & pressure rating
4 PED data
5 Marking according to NEPSI and permissible ambient temperature range
6 Built-in equipment
7 Data matrix
8 Safety instructions, disposal symbol and China RoHs symbol

DEVICE DESCRIPTION 2
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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 / 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, 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 Device category
Variable area flowmeters are designed in accordance with GB 3836.1-2010 and GB 3836.4-2010
for use in zone 1.
The inside of the measuring unit is also approved for zone 1.
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 medium must be 10
-8
S/m, in
order to avoid danger from electrostatic charge.
INFORMATION!
Definition of zone 1:
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, under normal operation may occasionally occur.

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2.6 Protection types
The variable area flowmeter is designed in the type of protection "intrinsic safety", protection
level "ia".
The marking for equipment protection level Gb is:
Ex ia IIC T1-T6 Gb
Ex ia IIC T1-T6 GbEx ia IIC T1-T6 Gb
Ex ia IIC T1-T6 Gb
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
The marking contains the following information:
Ex ia
Ex iaEx ia
Ex ia Explosion protection type "intrinsic safety", level of protection "ia"
IIC
IICIIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
T1-T6
T1-T6T1-T6
T1-T6 Temperature class range, suitable for temperature classes T1 to T6
Gb
GbGb
Gb EPL, suitable for zone 1 and zone 2
INFORMATION!
For the equipment protection level (EPL) Gb, connection to an intrinsically safe circuit with level
of protection "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with level of
protection "ia", a higher protection level is given.

DEVICE DESCRIPTION 2
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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. In fact, the
temperature class of these devices is a function of the present product temperature and ambient
temperature, as well as the specific device version.
The classification is outlined in the following tables
The tables take into account the following parameters:
•Ambient temperature T
amb
•Product temperature T
m
DK3./../.././../A-Ex permissible product 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 manufacturer's
installation instructions.
• 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 product 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

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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

INSTALLATION 3
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3.1 Installation
Mounting and setup must be carried out according to the applicable installation standards
(e.g. GB 3836.15) by qualified personnel trained in explosion protection. The information given in
the standard documentation and the supplementary instructions must be observed at all times.
Variable area flowmeters must be installed in such a way that
•there is no danger from mechanical impact effects.
•no external forces are affecting the indication unit.
•the device is accessible for any necessary visual inspections and can be viewed from all sides.
•the nameplate is clearly visible.
•it can be operated from a location with secure footing.
3.2 Special conditions and requirements
Electrostatic charge
For the versions with plug connector (type code is S), friction on the surface of the plastic plug
connector should be avoided in case there will cause the ignition by electrostatic accumulation.
Special requirements
•Only be connected to the certified associated apparatus, the flowmeter could be used in the
explosive atmosphere. The connection should be complied whith the requirements of the
manual of the associated apparatus. The maximum values for connection to a certified
associated apparatus are shown in the section "Electrical data".
•The correlation between the temperature classification and the permissible maximum
ambient temperature for limit switch is shown in the attachment to its individual certificate,
at the same time the permissible ambient temperature of the flowmeter doesn't higher than
the less permissible maximum ambient temperature between the flowmeter and the limit
switch at the same temperature classification.
•Users are forbidden to change the configuration to ensure the explosion protection
performance of the equipment. Any faults shall be settled with experts from the
manufacturer.
•During installation, operation and maintenance refer to the relevant instructions in the
standard documentation,
GB3836.13-2013 "Explosive atmospheres - Part 13: Equipment repair, overhaul and
reclamation",
GB3836.15-2000 "Electrical apparatus for explosive gas atmospheres - Part 15: Electrical
installations in hazardous areas (other than mines)",
GB50257-2014 "Code for construction and acceptance of electric device for explosive
atmospheres and fire hazard electrical equipment installation engineering".
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.

4 ELECTRICAL CONNECTIONS
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4.1 General notes
For version DK3./../../S/../A-Ex (plug), the separate intrinsically safe signal circuits with level of
protection "ia" or "ib" are electrically connected in the terminal compartment of the plug
housing. 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. 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 in such a way that it is sufficiently protected against
damage.
All cores that are not used must be securely connected to the earth potential of the hazardous
area or carefully insulated against each other and against earth (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. 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 minusMax minus green
4Max plus brown
5Lift slot
6Fastening screw of connection box

ELECTRICAL CONNECTIONS 4
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4.2 Connection assignment
The electrical connection of the limit switches is implemented at the version with connector (S)
in the wiring space of the connector housing in accordance with the connection diagram shown
in the standard instructions.
Connecting cable
The connecting cables for the intrinsically safe circuits are to be selected in accordance with the
valid installation standards.
4.3 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.
Figure 4-1: Position of the ground terminal
1 Grounding screw

5 OPERATION
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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.

SERVICE 6
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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.

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Tel.: [phone]
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[email protected]
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