KROHNE DK32 Series User manual

Variable area flowmeters
Electronic revision ESK3x: ER 1.0.x
DK32 - DK34 - DK37
DK32 - DK34 - DK37DK32 - DK34 - DK37
DK32 - DK34 - DK37 Handbook
HandbookHandbook
Handbook
© KROHNE 11/2018 - 4000287105 - MA DK32-34-37 R07 en

All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without
the prior written authorisation of KROHNE Messtechnik GmbH.
Subject to change without notice.
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Copyright 2018 by
KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany)
: IMPRINT :::::::::::::::::::::::::::::::::::::::

CONTENTS
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DK32 - DK34 - DK37
1 Safety instructions 5
1.1 Intended use ..................................................................................................................... 5
1.2 Certifications .................................................................................................................... 6
1.3 Pressure equipment directive.......................................................................................... 6
1.4 Safety instructions from the manufacturer ..................................................................... 8
1.4.1 Copyright and data protection ................................................................................................ 8
1.4.2 Disclaimer ............................................................................................................................... 8
1.4.3 Product liability and warranty ................................................................................................ 9
1.4.4 Information concerning the documentation........................................................................... 9
1.4.5 Warnings and symbols used................................................................................................. 10
1.5 Safety instructions for the operator............................................................................... 10
2 Device description 11
2.1 Scope of delivery............................................................................................................. 11
2.2 Device versions............................................................................................................... 12
2.3 Nameplate ...................................................................................................................... 14
2.4 Description code............................................................................................................. 15
2.5 Electronic revision DK32/ESK, DK34/ESK ..................................................................... 15
3 Installation 16
3.1 General notes on installation ......................................................................................... 16
3.2 Storage ........................................................................................................................... 16
3.3 Installation conditions ....................................................................................................16
4 Electrical connections 17
4.1 Safety instructions.......................................................................................................... 17
4.2 Electrical connection of the limit switches.................................................................... 18
4.3 Settings of limit switches of DK32, DK34....................................................................... 19
4.4 Electrical signal output ESK3x for DK32, DK34............................................................. 20
4.4.1 Power supply......................................................................................................................... 21
4.4.2 Load for HART communication............................................................................................. 21
4.4.3 Configuration......................................................................................................................... 21
4.5 Settings of limit switches for DK37/M8M....................................................................... 22
4.6 Electrical signal output for DK37/M8E........................................................................... 23
4.6.1 Power supply......................................................................................................................... 24
4.6.2 Load for HART communication............................................................................................. 24
4.6.3 Configuration......................................................................................................................... 24
4.7 Grounding connections................................................................................................... 25
4.8 Ingress protection .......................................................................................................... 26
5 Start-up 27
5.1 Standard device .............................................................................................................. 27

CONTENTS
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DK32 - DK34 - DK37
6 Service 28
6.1 Maintenance ................................................................................................................... 28
6.2 Spare parts availability...................................................................................................29
6.3 Availability of services .................................................................................................... 29
6.4 Returning the device to the manufacturer..................................................................... 29
6.4.1 General information.............................................................................................................. 29
6.4.2 Form (for copying) to accompany a returned device............................................................ 30
6.5 Disposal .......................................................................................................................... 30
6.6 Disassembly and recycling............................................................................................. 31
6.6.1 Description of the device components ................................................................................. 31
6.6.2 Indicator versions ................................................................................................................. 32
7 Technical data 34
7.1 Functional principle........................................................................................................ 34
7.2 Technical data................................................................................................................. 35
7.3 Dimensions and weight .................................................................................................. 41
7.3.1 DK32, DK34 ........................................................................................................................... 41
7.3.2 DK32, DK34 with transmitter housing ESK3x ...................................................................... 43
7.3.3 DK37/M8M............................................................................................................................. 44
7.3.4 DK37/M8E.............................................................................................................................. 45
7.3.5 Minimum distances when installing several measuring devices ........................................ 46
7.4 Measuring ranges...........................................................................................................47
7.5 Differential pressure regulators.................................................................................... 49

SAFETY INSTRUCTIONS 1
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1.1 Intended use
The variable area flowmeters are suitable for measuring gases and liquids.
The devices are particularly suitable for the measurement of small quantities of:
•Process or carrier gases
•Nitrogen, CO
2
or other industrial gases
•Sample flows for process analysers
•Sealing gas or sealing liquid measurement on sealing systems
•Purge fluids for measuring systems
•Air or water
•Chemicals and additives
•Lubricating, cooling and anti-corrosive agents
CAUTION!
Responsibility for the use of the measuring devices with regard to suitability, intended use and
corrosion resistance of the used materials against the measured fluid lies solely with the
operator.
INFORMATION!
This device is a Group 1, Class A device as specified within CISPR11:2009. It is intended for use in
industrial environment. There may be potential difficulties in ensuring electromagnetic
compatibility in other environments, due to conducted as well as radiated disturbances.
INFORMATION!
The manufacturer is not liable for any damage resulting from improper use or use for other than
the intended purpose.
DANGER!
For devices used in hazardous areas, additional safety notes apply; please refer to the Ex
documentation.
CAUTION!
Do not use any abrasive media containing solid particles.

1 SAFETY INSTRUCTIONS
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1.2 Certifications
The device fulfils all applicable statutory requirements of the EU directives:
•Pressure equipment directive
•For devices with electrical installations: EMC directive
•Devices for use in hazardous areas: ATEX directive
The manufacturer certifies successful testing of the product by applying the CE marking.
An EU declaration of conformity regarding the directives in question and the associated
harmonised standards can be downloaded from our website.
1.3 Pressure equipment directive
A conformity assessment in accordance with pressure equipment directive has been carried out
for the devices described. Conformity is certified by applying the CE mark. The number of the
notified body is also stated.
The PED key describes the rating of the devices:
The PED key identification can be found on the nameplate of the device (for details refer to
Nameplate on page 14).
CE marking
Example: PED/G1/4.3/SEP
G Gases and steam
1Fluidgroup1
4.3 Article 4.3 of the directive 2014/68/EU
SEP Sound engineering practice
INFORMATION!
The stated pressures (PS) and temperatures (TS) only apply as refers to the pressure resistance
of the sensor body. As regards the functionality of the entire device, further restrictions of the
maximum temperature may need to be observed (e.g. ATEX approval). Devices rated below
category I due to their size, do not receive the CE mark in the scope of the PED. These devices
are subject to applicable sound engineering practice (SEP).

SAFETY INSTRUCTIONS 1
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Residual risk
A risk analysis in accordance with the pressure equipment directive has been carried out for the
devices . The residual risk is described as follows:
•The devices are designed according to the valid and applicable rules and standards for static
operation and their pressure resistance is calculated for the declared maximum pressure
and temperature (no calculation for cyclical change).
•Responsibility for the use of the measuring devices with regard to corrosion resistance of the
used materials against the measured fluid lies solely with the operator.
•Avoid abrasion.
•Avoid pulsation and cavitation.
•Protect devices from vibration and high-frequency oscillation.
•Draining (backflow) may be delayed due to the float in the measuring tube. Expect residue
around the valve and in the differential pressure regulator.
•Implement appropriate measures to counteract external fire hazards

1 SAFETY INSTRUCTIONS
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1.4 Safety instructions from the manufacturer
1.4.1 Copyright and data protection
The contents of this document have been created with great care. Nevertheless, we provide no
guarantee that the contents are correct, complete or up-to-date.
The contents and works in this document are subject to copyright. Contributions from third
parties are identified as such. Reproduction, processing, dissemination and any type of use
beyond what is permitted under copyright requires written authorisation from the respective
author and/or the manufacturer.
The manufacturer tries always to observe the copyrights of others, and to draw on works created
in-house or works in the public domain.
The collection of personal data (such as names, street addresses or e-mail addresses) in the
manufacturer's documents is always on a voluntary basis whenever possible. Whenever
feasible, it is always possible to make use of the offerings and services without providing any
personal data.
We draw your attention to the fact that data transmission over the Internet (e.g. when
communicating by e-mail) may involve gaps in security. It is not possible to protect such data
completely against access by third parties.
We hereby expressly prohibit the use of the contact data published as part of our duty to publish
an imprint for the purpose of sending us any advertising or informational materials that we have
not expressly requested.
1.4.2 Disclaimer
The manufacturer will not be liable for any damage of any kind by using its product, including,
but not limited to direct, indirect or incidental and consequential damages.
This disclaimer does not apply in case the manufacturer has acted on purpose or with gross
negligence. In the event any applicable law does not allow such limitations on implied warranties
or the exclusion of limitation of certain damages, you may, if such law applies to you, not be
subject to some or all of the above disclaimer, exclusions or limitations.
Any product purchased from the manufacturer is warranted in accordance with the relevant
product documentation and our Terms and Conditions of Sale.
The manufacturer reserves the right to alter the content of its documents, including this
disclaimer in any way, at any time, for any reason, without prior notification, and will not be liable
in any way for possible consequences of such changes.

SAFETY INSTRUCTIONS 1
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1.4.3 Product liability and warranty
The operator shall bear responsibility for the suitability of the device for the specific purpose.
The manufacturer accepts no liability for the consequences of misuse by the operator. Improper
installation or operation of the devices (systems) will cause the warranty to be void. The
respective "Standard Terms and Conditions" which form the basis for the sales contract shall
also apply.
1.4.4 Information concerning the documentation
To prevent any injury to the user or damage to the device it is essential that you read the
information in this document and observe applicable national standards, safety requirements
and accident prevention regulations.
If this document is not in your native language and if you have any problems understanding the
text, we advise you to contact your local office for assistance. The manufacturer can not accept
responsibility for any damage or injury caused by misunderstanding of the information in this
document.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device. Special considerations and precautions are also described in the
document, which appear in the form of icons as shown below.

1 SAFETY INSTRUCTIONS
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1.4.5 Warnings and symbols used
Safety warnings are indicated by the following symbols.
• HANDLING
HANDLINGHANDLING
HANDLING
This symbol designates all instructions for actions to be carried out by the operator in the
specified sequence.
iRESULT
RESULTRESULT
RESULT
This symbol refers to all important consequences of the previous actions.
1.5 Safety instructions for the operator
DANGER!
This warning refers to the immediate danger when working with electricity.
DANGER!
This warning refers to the immediate danger of burns caused by heat or hot surfaces.
DANGER!
This warning refers to the immediate danger when using this device in a hazardous atmosphere.
DANGER!
These warnings must be observed without fail. Even partial disregard of this warning can lead to
serious health problems and even death. There is also the risk of seriously damaging the device
or parts of the operator's plant.
WARNING!
Disregarding this safety warning, even if only in part, poses the risk of serious health problems.
There is also the risk of damaging the device or parts of the operator's plant.
CAUTION!
Disregarding these instructions can result in damage to the device or to parts of the operator's
plant.
INFORMATION!
These instructions contain important information for the handling of the device.
LEGAL NOTICE!
This note contains information on statutory directives and standards.
WARNING!
In general, devices from the manufacturer may only be installed, commissioned, operated and
maintained by properly trained and authorized personnel.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device.

DEVICE DESCRIPTION 2
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2.1 Scope of delivery
INFORMATION!
Inspect the packaging carefully for damages or signs of rough handling. Report damage to the
carrier and to the local office of the manufacturer.
INFORMATION!
Do a check of the packing list to make sure that you have all the elements given in the order.
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.
Figure 2-1: Scope of delivery
1 Measuring device in ordered version
2 Product documentation
3 Certificates, calibration report (supplied to order only)

2 DEVICE DESCRIPTION
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2.2 Device versions
•DK32 with valve and horizontal connection
•DK34 without valve and vertical connection
•DK37 with valve and horizontal connection
•DK37 without valve and vertical connection
The following designs are available as options:
•with inlet pressure regulator
•with outlet pressure regulator
•with flange adapter (total length: 250 mm / 9.8")
•with indicator housing DK37 in stainless steel
•with limit switches or 4...20 mA/HART signal output
Figure 2-2: Device versions
1 DK32 with valve and horizontal connection
2 DK34 without valve and vertical connection
3 DK37/M8E with valve and electronic indicator
4 DK37/M8M with valve and mechanical indicator
Figure 2-3: Versions with regulators
1 DK32 with inlet pressure regulator
2 DK32 with outlet pressure regulator

DEVICE DESCRIPTION 2
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Figure 2-4: Versions with flange adapter
1 DK34 with DN15/PN40 adapter
2 DK32 with DN15/PN40 adapter
Figure 2-5: Version DK37 with stainless steel housing
1 DK37/M8E/R
2 DK37/M8M/R
Figure 2-6: Versions DK32 with limit switches or 4...20 mA/HART signal output
1 DK32 with limit switches
2 DK32 with 4...20 mA/HART signal output

2 DEVICE DESCRIPTION
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2.3 Nameplate
Additional markings on the measuring device:
•SO - sales order / item
•PA - production order
•Vx - product configurator code
•AC - article code
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.
Figure 2-7: Examples of nameplates
1 Device type
2 Manufacturer
3 Identification number of the notified body ATEX & PED
4 Rating data: temperature & pressure rating
5 PED data
6 Ex data
7 Electrical connection data
8 Matrix code
9 Note to observe the documentation and for disposal

DEVICE DESCRIPTION 2
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2.4 Description code
The description code consists of the following elements*:
* positions which are not needed are omitted (no blank positions)
* positions which are not needed are omitted (no blank positions)
2.5 Electronic revision DK32/ESK, DK34/ESK
The electronic revision of the ESK3x indicates the respective hardware/software status of the
electronics.
Figure 2-8: Description code DK32, DK34
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, type NAMUR / K2 - two limit switches, type NAMUR /
R1 - one limit switch, type Reed / ESK - 4...20 mA/HART
®
4 S - plug connector / L - cable entry including cable
5 HT - high-temperature version
6 free
7 Ex - Explosion-protected equipment
8 SK - SIL conformity according to IEC 61508 of the limit switch
Figure 2-9: Description code DK37
1 M8M - mechanical indicator / M8E - electronic indicator
2 without - indicator housing in PPS
R - indicator housing in stainless steel
3 RE - inlet pressure regulator / RA - outlet pressure regulator
4 K1 - one limit switch / K2 - two limit switches
5 Ex is not part of the description code
6 SK - SIL conformity according to IEC 61508 of the limit switch
SE - SIL conformity according to IEC 61508 of the current output
Electronic revision Explanation
ER 1.0.x Basic version
Table 2-1: Description of the electronic revision

3 INSTALLATION
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3.1 General notes on installation
3.2 Storage
•Store the device in a dry, dust-free location.
•Avoid lasting direct exposure to the sun.
•Store the measuring device in the original packaging.
•The permissible storage temperatures for standard devices are: -40...+80°C / -40...+176°F
3.3 Installation conditions
INFORMATION!
Inspect the packaging carefully for damages or signs of rough handling. Report damage to the
carrier and to the local office of the manufacturer.
INFORMATION!
Do a check of the packing list to make sure that you have all the elements given in the order.
INFORMATION!
Check on the device nameplates, that the device is supplied according to your order.
CAUTION!
When installing the device in the piping, the following points must be observed:
• The variable area flowmeter must be installed vertically (measuring principle). Flow direction
from bottom to top. For installation recommendations please refer also to directive
VDI/VDE 3513, sheet 3.
• Before connecting, blow or flush out the pipes leading to the device.
• Piping for gas flow need to be dried before the device is installed.
• Use connectors suitable for the particular device version.
• Align the piping centrically with the connection bores on the measuring device so they are
free of stresses.
• If necessary, the piping has to be supported to avoid the vibrations transmitted to the
measuring device.
• Do not lay signal cables directly next to cables for the power supply.
• When several devices are installed next to one another, a minimum distance between the
devices is necessary (for details refer to chapter "Technical data").
• The device must not be heated by radiated heat (e.g. exposure to the sun) to an electronics
housing surface temperature above the maximum permissible ambient temperature. If it is
necessary to prevent damage from heat sources, a heat protection (e.g. sun shade) has to be
installed.

ELECTRICAL CONNECTIONS 4
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4.1 Safety instructions
DANGER!
All work on the electrical connections may only be carried out with the power disconnected. Take
note of the voltage data on the nameplate!
DANGER!
Observe the national regulations for electrical installations!
DANGER!
For devices used in hazardous areas, additional safety notes apply; please refer to the Ex
documentation.
WARNING!
Observe without fail the local occupational health and safety regulations. Any work done on the
electrical components of the measuring device may only be carried out by properly trained
specialists.
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.

4 ELECTRICAL CONNECTIONS
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4.2 Electrical connection of the limit switches
The electrical connection of the limit switches is made for
•DK../../S - in connection plug
•DK../../L - via a cable assembly
The following procedures are to be performed (DK../../S):
• Loosen the screw 6of the connector plug
• Pull out the plug.
• Remove the screw 6completely from the plug.
• Insert a screwdriver in the marked opening 5(lift) and remove the terminal block.
• Lead the connection cable through the cable gland.
• Insert the cable (max. 1.5 mm
2
) and tighten it.
Figure 4-1: Electrical connection of the limit switches
5Lift slot
6Fastening screw of connection box
Contact connection Stranded wire colour for cable assembly
1Min minus white
2Min plus yellow
3Max minus green
4Max plus brown
Table 4-1: Contact connections

ELECTRICAL CONNECTIONS 4
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4.3 Settings of limit switches of DK32, DK34
Set the pointers to the desired limit values as a min. contact 1or max. contact 2along the
scale.
Settings of limit switches with Reed contact:
• Loosen the nut 3.
• Set the reed cartridge to the desired value.
• Fix the nut 3.
Figure 4-2: Connection of 3-wire reed contact
1Silicone-insulated wire - yellow/green / FEP-insulated wire - red
2Silicone-insulated wire - brown / FEP-insulated wire - brown
3Silicone-insulated wire - blue / FEP-insulated wire - blue
Table 4-2: Stranded wire colour for devices with cable assembly
Figure 4-3: Settings of limit switches of DK32, DK34
INFORMATION!
The reed contact is actuated directly by the float magnet. The desired switching point can only be
determined in measuring mode. A reference to the scale and/or pointer cannot be established.

4 ELECTRICAL CONNECTIONS
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4.4 Electrical signal output ESK3x for DK32, DK34
The following procedures are to be performed:
• Loosen the lock screw 1on the locking mechanism using an Allen key (WS3).
• Unscrew the cover.
• Connect the connecting cables to the device terminals in the terminal block 2by ensuring the
correct polarity.
• Screw on the cover.
• Tighten the lock screw on the locking mechanism using an Allen key (WS3).
Figure 4-4: Electrical connection of ESK3x
1 Lock screw
2 Terminal block
3 Power supply 12...32 VDC
4 Measuring signal 4...20 mA
5 External load, HART
®
communication
DANGER!
For devices intended for use in hazardous areas with dust-resistant housing and/or secondary
pressure containment, the special conditions for sealing the electronic compartment and for the
cable entry are available in the supplementary instructions.