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DK32 - DK34 - DK37
Handbook
Variable area flowmeters
Electronic revision ESK3x: ER 1.1.x
© KROHNE 09/2020 - 4000287107 - MA DK32-34-37 R09 en
:
IMPRINT
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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.
2
Copyright 2020 by
KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany) www.krohne.com
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CONTENTS
1 Safety instructions 5
1.1 Electronic revision DK32/ESK, DK34/ESK ....................................................................... 5
1.2 Intended use ..................................................................................................................... 5
1.3 Certifications .................................................................................................................... 6
1.4 Pressure equipment directive.......................................................................................... 7
1.5 Safety instructions from the manufacturer ..................................................................... 8
1.5.1 Copyright and data protection ................................................................................................ 8
1.5.2 Disclaimer ............................................................................................................................... 8
1.5.3 Product liability and warranty ................................................................................................ 9
1.5.4 Information concerning the documentation........................................................................... 9
1.5.5 Warnings and symbols used................................................................................................. 10
1.6 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
3 Installation 16
3.1 General notes on installation ......................................................................................... 16
3.2 Storage ........................................................................................................................... 16
3.3 Transport ........................................................................................................................ 16
3.4 Installation conditions .................................................................................................... 16
4 Electrical connections 17
4.1 Safety instructions.......................................................................................................... 17
4.2 Electrical connection of limit switches .......................................................................... 18
4.2.1 Electrical connection DK32 / DK34....................................................................................... 18
4.2.2 Electrical connection DK37 M8M.......................................................................................... 19
4.2.3 Settings of NAMUR limit switches for DK32, DK34, DK37 M8M .......................................... 20
4.2.4 Settings of Reed limit switch ................................................................................................ 20
4.3 Electrical signal output ESK3x for DK32, DK34............................................................. 21
4.3.1 Power supply......................................................................................................................... 22
4.3.2 Load for HART communication............................................................................................. 22
4.3.3 Configuration......................................................................................................................... 22
4.4 Electrical signal output for DK37/M8E........................................................................... 23
4.4.1 Power supply......................................................................................................................... 24
4.4.2 Load for HART communication............................................................................................. 24
4.4.3 Configuration......................................................................................................................... 24
4.5 Grounding connections................................................................................................... 25
4.6 Ingress protection .......................................................................................................... 26
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CONTENTS
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5 Start-up 27
5.1 Start-up........................................................................................................................... 27
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
7.2.1 Temperatures for all device versions................................................................................... 37
7.2.2 Electrical connection data for indicator DK32, DK34, DK37/M8M with limit switch ........... 38
7.2.3 Electrical connection data for transmitter ESK3x for DK32, DK34 ..................................... 39
7.2.4 Electrical connection data for indicator DK37/M8E with electrical signal output .............. 40
7.2.5 Approvals .............................................................................................................................. 41
7.3 Dimensions and weight .................................................................................................. 42
7.3.1 DK32, DK34 ........................................................................................................................... 42
7.3.2 DK32, DK34 with transmitter housing ESK3x ...................................................................... 44
7.3.3 DK37/M8M............................................................................................................................. 45
7.3.4 DK37/M8E.............................................................................................................................. 46
7.3.5 Minimum distances when installing several measuring devices ........................................ 47
7.4 Measuring ranges........................................................................................................... 48
7.4.1 Float ...................................................................................................................................... 48
7.4.2 Valves (only DK32 and DK37) ................................................................................................ 49
7.5 Flow regulators for variable pressure (only DK32 and DK37)....................................... 50
7.5.1 Control ranges ...................................................................................................................... 51
7.5.2 Technical data for flow regulators ....................................................................................... 52
7.5.3 Dimensions with flow regulator ........................................................................................... 53
8 Notes 54 www.krohne.com
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SAFETY INSTRUCTIONS
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1.1 Electronic revision DK32/ESK, DK34/ESK
The electronic revision of the ESK3x indicates the respective hardware/software status of the electronics.
Electronic revision Explanation
ER 1.1.x
Basic version
Table 1-1: Description of the electronic revision
Documentation
MA DK32-37 R07, R08, R09
1.2 Intended use
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.
The variable area flowmeters are suitable for measuring gases and liquids.
•
•
•
•
INFORMATION!
• The product may not contain any ferromagnetic particles or solids.
The product must be sufficiently liquid and free of deposits.
Avoid pressure surges and pulsing flows.
Open valves slowly.
Do not use solenoid valves.
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SAFETY INSTRUCTIONS
DK32 - DK34 - DK37
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
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.
1.3 Certifications
CE marking
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 mark.
An EU declaration of conformity regarding the directives in question and the associated harmonised standards can be downloaded from our website.
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SAFETY INSTRUCTIONS
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1.4 Pressure equipment directive
A conformity assessment in accordance with pressure equipment directive has been carried out for the devices described.
The PED key describes the rating of the devices:
Example: PED/G1/4.3/SEP
G
1
4.3
SEP
Gases and vapours
Fluid group 1
Article 4.3 of the directive 2014/68/EU
Sound engineering practice
Table 1-2: Example of PED key
The PED key identification can be found on the nameplate of the device (for details refer to
Nameplate on page 14).
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).
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 flow regulator.
• Implement appropriate measures to counteract external fire hazards.
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SAFETY INSTRUCTIONS
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1.5 Safety instructions from the manufacturer
1.5.1 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.
1.5.2 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.
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SAFETY INSTRUCTIONS
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1.5.3 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.
1.5.4 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.
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SAFETY INSTRUCTIONS
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1.5.5 Warnings and symbols used
Safety warnings are indicated by the following symbols.
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.
• HANDLING
This symbol designates all instructions for actions to be carried out by the operator in the specified sequence.
i RESULT
This symbol refers to all important consequences of the previous actions.
1.6 Safety instructions for the operator
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.
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DEVICE DESCRIPTION
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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)
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DEVICE DESCRIPTION
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 flow regulator for variable inlet pressure
• with flow regulator for variable outlet pressure
• 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
DK32 - DK34 - DK37
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
12
Figure 2-3: Versions with regulators
1 DK32 with flow regulator for variable inlet pressure
2 DK32 with flow regulator for variable outlet pressure www.krohne.com
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DEVICE DESCRIPTION
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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 NAMUR limit switches
2 DK32 with 4...20 mA/HART signal output
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DEVICE DESCRIPTION
DK32 - DK34 - DK37
2.3 Nameplate
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
4 Rating data: temperature & pressure rating
5 Data according to the pressure equipment directive
6 Marking according to the notified body
7 Electrical connection data
8 Data Matrix Code
9 Note to observe the documentation and for disposal
Additional markings on the measuring device:
• SO - sales order / item
• PA - production order
• Vx - product configurator code
• AC - article code
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DEVICE DESCRIPTION
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2.4 Description code
The description code consists of the following elements *:
Figure 2-8: Description code DK32, DK34
1 32 - with valve and horizontal connection
34 - without valve and vertical connection
2 RE - flow regulator for variable inlet pressure
RA - flow regulator for variable outlet pressure
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
* positions which are not needed are omitted (no blank positions)
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 - flow regulator for variable inlet pressure
RA - flow regulator for variable outlet pressure
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
* positions which are not needed are omitted (no blank positions)
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INSTALLATION
DK32 - DK34 - DK37
3.1 General notes on installation
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.
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 are: -40...+80 ° C / -40...+176 ° F
3.3 Transport
If possible, transport the device to the installation point in the original packaging.
3.4 Installation conditions
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.
•
•
•
•
•
•
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 each other, 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.
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ELECTRICAL CONNECTIONS
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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.
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ELECTRICAL CONNECTIONS
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4.2 Electrical connection of limit switches
4.2.1 Electrical connection DK32 / DK34
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 6 of the connector plug
• Pull out the plug.
• Remove the screw 6 completely 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 NAMUR limit switches
5 Lift slot
6 Fastening screw of connection box
Contact connection
1
2
3
4
Min minus
Min plus
Max minus
Max plus
Table 4-1: Contact connections
Stranded wire colour for cable assembly white yellow green brown
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ELECTRICAL CONNECTIONS
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Figure 4-2: Connection of 3-wire reed contact
1
2
3
Silicone-insulated wire - yellow/green / FEP-insulated wire - red
Silicone-insulated wire - brown / FEP-insulated wire - brown
Silicone-insulated wire - blue / FEP-insulated wire - blue
Table 4-2: Stranded wire colour for devices with cable assembly
4.2.2 Electrical connection DK37 M8M
Figure 4-3: Electrical connection of NAMUR limit switches
Contact
1
2
Kmin +
Kmin -
Kmax +
Kmax -
Table 4-3: Contact connections
Contact connection
Min plus
Min minus
Max plus
Max minus
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ELECTRICAL CONNECTIONS
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4.2.3 Settings of NAMUR limit switches for DK32, DK34, DK37 M8M
Set the pointers to the desired limit values as a min. contact 1 or max. contact 2 along the scale.
Figure 4-4: Settings of NAMUR limit switches for DK32, DK34, DK37 M8M
If the pointer vane goes into the slot, an alarm is triggered. An alarm is also triggered in the event of a cable break or short circuit if a suitable amplifier is used.
4.2.4 Settings of Reed limit switch
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Figure 4-5: Settings of Reed limit switch
• Loosen the nut 1 .
• Set the reed cartridge to the desired value.
• Fix the nut 1 .
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.
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ELECTRICAL CONNECTIONS
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4.3 Electrical signal output ESK3x for DK32, DK34
Figure 4-6: Electrical connection of ESK3x
1 Lock screw in case of Ex d/XP device version
2 Terminal block
3 Power supply 12...32 VDC
4 Measuring signal 4...20 mA
5 External load, HART ® communication
The following procedures are to be performed:
• Loosen the Ex d/XP lock screw 1 on the locking mechanism using an Allen key (WS3).
• Unscrew the cover.
• Connect the connecting cables to the device terminals in the terminal block 2 by ensuring the correct polarity.
• Screw on the cover.
• Tighten the Ex d/XP lock screw on the locking mechanism using an Allen key (WS3).
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.
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ELECTRICAL CONNECTIONS
DK32 - DK34 - DK37
4.3.1 Power supply
INFORMATION!
The supply voltage has to be between 12 VDC and 32 VDC. This is based on the total resistance of the measuring loop. To calculate this, the resistance of each component in the measuring loop
(not including the device) must be added up.
The required supply voltage can be calculated using the following formula:
U ext
= R
L
* 22 mA + 12 V with
U ext
= minimum supply voltage
R
L
= total measuring loop resistance
INFORMATION!
The power supply has to be able to supply a minimum of 22 mA.
4.3.2 Load for HART communication
INFORMATION!
For HART ® communication a load of at least 250 Ω is required.
The maximum load resistance is calculated as follows:
R
L
= (U ext
- 12 V) / 22 mA
DANGER!
Use a twisted two-core cable to prevent electrical interference from impeding the DC output signal.
In some cases a shielded cable may be necessary. The cable shield may only be grounded
(common ground connection) at one point (on the power supply unit).
4.3.3 Configuration
The ESK3x electrical signal output can be configured via HART ® communication. DDs (Device
Description) and DTMs (Device Type Manager) are available for the configuration.
They can be downloaded free of charge from our website.
The current flow rate can be transmitted using the integrated HART ® communication.
A flow counter can be configured. Two limit values can be monitored. The limit values are assigned either to flow values or to the counter overflow.
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4.4 Electrical signal output for DK37/M8E
ELECTRICAL CONNECTIONS
4
Figure 4-7: Electrical connection M8E
1 Terminal connection
2 Power supply 14.8...30 VDC
3 Measuring signal 4...20 mA
4 External load, HART ® communication
Wiring must be planned with great care when it comes to connecting other devices such as evaluation units or process control. Internal connections in these devices (e.g. GND with PE, mass loops) may lead to non-permitted voltage potentials which could negatively affect the function of the device itself or that of a device connected to it. In such cases a protected extralow voltage (PELV) is recommended.
Figure 4-8: Electrical connection with galvanic isolation
1 Terminal connection
2 Signal converter isolator with galvanic isolation
3 Power supply (refer to isolator information)
4 Measuring signal 4...20 mA
5 External load, HART ® communication
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ELECTRICAL CONNECTIONS
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4.4.1 Power supply
INFORMATION!
The supply voltage has to be between 14.8 VDC and 30 VDC. This is based on the total resistance of the measuring loop. To calculate this, the resistance of each component in the measuring loop
(not including the device) must be added up.
The required supply voltage can be calculated using the following formula:
U ext
= R
L
* 22 mA + 14.8 V with
U ext
= minimum supply voltage
R
L
= total measuring loop resistance
INFORMATION!
The power supply has to be able to supply a minimum of 22 mA.
4.4.2 Load for HART communication
INFORMATION!
For HART ® communication a load of at least 250 Ω is required.
The maximum load resistance is calculated as follows:
R
L
= (U ext
- 14.8 V) / 22 mA
DANGER!
Use a twisted two-core cable to prevent electrical interference from impeding the DC output signal.
In some cases a shielded cable may be necessary. The cable shield may only be grounded
(common ground connection) at one point (on the power supply unit).
4.4.3 Configuration
The M8E electronic indicator can be configured via HART ® communication. DDs (Device
Description) and DTMs (Device Type Manager) are available for the configuration.
They can be downloaded free of charge from our website.
The current flow rate can be transmitted using the integrated HART ® communication.
A flow counter can be configured. Two limit values can be monitored. The limit values are assigned either to flow values or to the counter overflow. The limit values are not depicted on the display.
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ELECTRICAL CONNECTIONS
4
4.5 Grounding connections
The measuring unit is grounded on the top fitting 1 (M4 threaded holes).
Alternatively, the DK32 and DK34 with ESK3x transmitter can be grounded at the transmitter housing.
Figure 4-9: Grounding connections
1 Grounding connection at measuring unit
DANGER!
The grounding wire may not transfer any interference voltage.
Do not use this grounding cable to ground any other electrical devices.
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4
ELECTRICAL CONNECTIONS
DK32 - DK34 - DK37
4.6 Ingress protection
The variable area flowmeters DK32 / DK34 / DK37 have been tested for IP protection in accordance with EN 60529 and NEMA 250.
The following protection categories have been achieved:
Device variant
DK32, DK34 mechanical
DK32, DK34 with limit switches K1/K2
DK32, DK34 with limit switch R1
DK32, DK34 with transmitter ESK3x
DK37 with PPS indicator
DK37 with stainless steel indicator
Table 4-4: Ingress protection
Ingress protection according to
EN 60529
IP66/IP68
IP65
IP65
IP66/IP68
IP66
IP66/IP67
NEMA 250
NEMA 4X
NEMA 4X
-
NEMA 4X
-
NEMA 4X
DANGER!
After all servicing and maintenance work on the measuring device, the specified ingress protection category must be ensured again.
Therefore it is essential to observe the following points:
• Use only original gaskets. They must be clean and free of any damage. Defective gaskets must be replaced.
• The electrical cables used must be undamaged and must comply with regulations.
• The cables must be laid with a loop 3 upstream of the measuring device to prevent water from getting into the housing.
• The cable feedthroughs 2 must be tightened.
• Close the unused cable feedthroughs with blanking plugs 1 .
• Do not remove the required cable bushing from the cable feedthrough.
26
Figure 4-10: Cable feedthrough
1 Use blanking plugs if no cable is routed through
2 Tighten the protection cap
3 Lay the cable in a loop www.krohne.com
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START-UP
5
5.1 Start-up
CAUTION!
When starting up the device, the following points must be observed:
• Compare the actual operating pressure and the product temperature of the system with the specifications on the nameplate (PS and TS). These specifications may not be exceeded.
•
•
•
•
•
Make sure materials are compatible.
Slowly open the shut-off valve.
When measuring liquids ensure that the pipelines are carefully evacuated.
When measuring gases, increase pressure slowly.
Avoid float impact (e.g. caused by solenoid valves), as this is likely to damage the measuring unit or float.
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6
SERVICE
DK32 - DK34 - DK37
6.1 Maintenance
Within the scope of routine maintenance of the system and pipelines, the flowmeter should also be inspected for signs of fouling, corrosion, mechanical wear and leaks, as well as damage to the measuring tube and the indicator.
We advise that inspections are carried out at least once per year.
The device must be removed from the pipeline before cleaning.
CAUTION!
Pressurised pipes have to be depressurised before removing the device.
In the case of devices used for measuring aggressive or hazardous media, 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.
Figure 6-1: Valve lock
CAUTION!
The packing seal for the valve may have to be adjusted during the service life. The union nut 1 must be tightened for this. It may be necessary to push the locking pin 2 back against its internal spring.
Comply with a maximum torque of 4 Nm.
CAUTION!
Valves that have not been used for a longer period of time may exhibit a higher actuating torque.
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SERVICE
6
6.2 Spare parts availability
The manufacturer adheres to the basic principle that functionally adequate spare parts for each device or each important accessory part will be kept available for a period of 3 years after delivery of the last production run for the device.
This regulation only applies to spare parts which are subject to wear and tear under normal operating conditions.
6.3 Availability of services
The manufacturer offers a range of services to support the customer after expiration of the warranty. These include repair, maintenance, technical support and training.
INFORMATION!
For more precise information, please contact your local sales office.
6.4 Returning the device to the manufacturer
6.4.1 General information
This device has been carefully manufactured and tested. If installed and operated in accordance with these operating instructions, it will rarely present any problems.
WARNING!
Should you nevertheless need to return a device for inspection or repair, please pay strict attention to the following points:
• Due to statutory regulations on environmental protection and safeguarding the health and safety of the personnel, the manufacturer may only handle, test and repair returned devices that have been in contact with products without risk to personnel and environment.
• This means that the manufacturer can only service this device if it is accompanied by the following certificate (see next section) confirming that the device is safe to handle.
WARNING!
If the device has been operated with toxic, caustic, radioactive, flammable or water-endangering products, you are kindly requested:
• to check and ensure, if necessary by rinsing or neutralising, that all cavities are free from such dangerous substances,
• to enclose a certificate with the device confirming that it is safe to handle and stating the product used.
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6
SERVICE
DK32 - DK34 - DK37
6.4.2 Form (for copying) to accompany a returned device
CAUTION!
To avoid any risk for our service personnel, this form has to be accessible from outside of the packaging with the returned device.
Company:
Department:
Address:
Name:
Telephone number:
Fax number:
Manufacturer order number or serial number:
Email address:
The device has been operated with the following medium:
This medium is: radioactive water-hazardous toxic caustic flammable
We checked that all cavities in the device are free from such substances.
We have flushed out and neutralized all cavities in the device.
We hereby confirm that there is no risk to persons or the environment caused by any residual media contained in this device when it is returned.
Signature: Date:
Stamp:
6.5 Disposal
LEGAL NOTICE!
Disposal must be carried out in accordance with legislation applicable in your country.
According to the directive 2012/19/EU, the monitoring and control instruments marked with the
WEEE symbol and reaching their end-of-life must not be disposed of with other waste
The user must dispose of the WEEE to a designated collection point for the recycling of WEEE or send them back to our local organisation or authorised representative.
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SERVICE
6
6.6 Disassembly and recycling
This section describes how to handle and disassemble the device in order to dispose of it following end of use. The information provided enables the end user to identify and separate the main components of the device for the purpose of recycling.
INFORMATION!
• Wear personal protective equipment
• Make sure to use a stable workstation / bench to disassemble
6.6.1 Description of the device components
Figure 6-2: Description of the device components
1 Measuring unit
2 Indicator housing
The variable area flowmeter consists of a mechanical, metallic measuring unit 1 and an indicator housing attached to it 2 , which may contain electronic components.
The metallic measuring unit can be sent to metal recycling after the indicator housing has been removed. Depending on the version, the measuring unit may weigh between 0.5...5 kg /
1.1...11 lb.
CAUTION!
Check and ensure that the measuring units, including all cavities, are free of hazardous substances by rinsing or neutralising if required. This should be done especially in the case of devices that have been operated with toxic, corrosive, radioactive, flammable or watercontaminating products to protect both the environment and the health and safety of staff.
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6
SERVICE
DK32 - DK34 - DK37
6.6.2 Indicator versions
The following discusses the indicator housing and optional electronics in more detail.
Indicator DK37/M8x and DK37/M8x/R
The indicator housing consists of the following components:
Approx. information Weight / size
DK37/M8x/R
Stainless steel housing
Glass panel
PPS (housing including cover)
Stainless steel (housing including cover)
Other metal parts as scale, pointer system, screws
Insert profile made of PA
45 cm
-
Table 6-1: Indicator DK37/M8x and DK37/M8x/R
² / 6.98 in
1550 g / 3.42 lb
50 g / 0.1 lb
40 g / 0.09 lb
²
DK37/M8x
Plastic housing
45 cm ² / 6.98 in ²
300 g / 0.66 lb
-
50 g / 0.1 lb
-
The indicator housing can be equipped either with an electronic transmitter DK37/M8E or with one or two limit switches DK37/M8/K1 or DK37/M8/K2. They become visible after opening the cover. These can be removed from the housing in order to send them to electronics recycling/disposal.
The electronic components consist of the following main components:
Approx. information Weight / size
DK37/ … /M8E
PCB-CPU potted
PCB-I/O not potted
PCB connection board
Potting (silicone)
Batteries
Electrolytic capacitors
LC-display
67 cm
45 cm
17 cm ² / 2.64 in ²
95 g / 0.21 lb
-
-
24 cm
²
²
²
/ 10.39 in
/ 6.98 in
/ 3.72 in
Table 6-2: Main components of the electronic components
²
²
²
DK37/ … /M8M/K.
< 1 cm
²
/ < 0.16 in
²
-
-
-
5 / 10 cm ² / 0.78 / 1.55 in ²
5 g / 0.01 lb
-
INFORMATION!
The PCBs are partially potted with silicone. It is thus not easy to separate the components by hand.
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SERVICE
6
Indicator DK32, DK34
The indicator housing consists of the following components:
Approx. information Weight / size
DK3./K.
Glass panel
Aluminium housing
Other metal parts as scale, pointer system, screws
Table 6-3: Indicator DK3./K. and DK3./ESK
9 cm ² / 1.40 in ²
170 g / 0.37 lb
50 g / 0.1 lb
DK3./ESK
9 cm ² / 1.40 in ²
460 g / 1.01 lb
50 g / 0.1 lb
The indicator housing can be equipped either with an electronic transmitter DK3./ESK or with one or two limit switches DK3./K. These can be removed from the housing in order to send them to electronics recycling/disposal.
The electronic components consist of the following main components:
Approx. information Weight / size
DK3./K.
PCB
Potting (silicone)
Batteries
Electrolytic capacitors
LC-display
1 cm
5 g / 0.01 lb
-
-
-
² / 0.16 in ²
Table 6-4: Main components of the electronic components
DK3./ESK
-
-
25 cm ² / 3.88 in ²
28 g / 0.06 lb
-
INFORMATION!
The PCBs are potted with silicone. It is thus not easy to separate the components by hand.
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7
TECHNICAL DATA
DK32 - DK34 - DK37
7.1 Functional principle
The flowmeter operates in accordance with the float measuring principle.
The measuring unit consists of a metal cone in which a float can move freely up and down.
The medium flows through the flowmeter from bottom to top.
The float adjusts itself so that the buoyancy force A acting on it, the form resistance W and its weight G are in equilibrium: G = A + W
Figure 7-1: Functional principle
For DK32, DK34 and DK37/M8M 1 the flow-dependent height of the float in the measuring unit is transmitted by means of a magnetic coupling on a scale.
With DK37/M8E, DK32/ESK and DK34/ESK 2 the flow-dependent height position of the float in the measuring unit is electronically detected with the magnetic field sensors S1 and S2.
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TECHNICAL DATA
7
7.2 Technical data
INFORMATION!
• The following data is provided for general applications. If you require data that is more relevant to your specific application, please contact us or your local sales office.
• Additional information (certificates, special tools, software,...) and complete product documentation can be downloaded free of charge from the website (Downloadcenter).
Measuring system
Application range
Function / Measuring principle
Measured value
Primary measured value
Secondary measured value
Measuring accuracy
Maximum measuring error DK32 / DK34
Maximum measuring error DK37
Operating conditions
Max. operating temperature TS
Flow measurement of liquids or gases
Float measuring principle
Float position
Operating volume flow, nominal volume flow or mass flow
3.0% of full scale range
4.0% of measured value according to VDI/VDE 3513-2 (q
G
= 50%)
2.0% of full scale range
2.5% of measured value according to VDI/VDE 3513-2 (q
G
= 50%)
Max. operating pressure PS
Max. test pressure PT
Depending on the version (refer to nameplate)
Standard version: up to +150 ° C / +221 ° F
HT version: up to +200 ° C / +392 ° F
For detailed information on product and ambient temperatures refer to Temperatures for all device versions on page 37.
Depending on the version (refer to nameplate)
Standard version: 130 barg / 1885 psig
Higher pressures on request
Depending on the version (refer to nameplate)
Standard version: 202 barg / 2930 psig
Higher pressures on request
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7
TECHNICAL DATA
DK32 - DK34 - DK37
DK32, DK34 mechanical
DK32, DK34 with limit switches K1/K2
DK32, DK34 with limit switch R1
DK32, DK34 with transmitter ESK3x
DK37 with PPS indicator
DK37 with stainless steel indicator
Installation conditions
Inlet and outlet sections
Protect devices from vibration and highfrequency oscillation
Materials
Top fitting, bottom fitting, cone
Lock screw
Float, standard
Dosing unit
Valve stem
Gasket of lock screw
Gasket of dosing unit
Indicator housing of DK32, DK34
Indicator housing of DK37/M8_/
Indicator housing of DK37/M8_/R/
Special materials
Options
Process connections
Standard
Option
Table 7-1: Technical data
IP66/IP68 and NEMA 4X
IP65 and NEMA 4X
IP65
IP66/IP68 and NEMA 4X
IP66
IP66/IP67 and NEMA 4X
None
Use in accordance with IEC 61298-3 in control room or field with medium vibration level.
Stainless steel 1.4404 / 316 L
Stainless steel 1.4404 / 316 L
Stainless steel 1.4404 / 316 L or titanium
Stainless steel 1.4571 / 316 Ti
Stainless steel 1.4404 / 316 L
PTFE
FPM/PTFE, PTFE, FFKM
Other gasket materials on request
Die-cast aluminium with powder coating
PPS
Stainless steel 1.4408/CF8M e.g. Titanium Grade 2, Hastelloy ® C276/2.4819, Monel ® /2.4360,
Inconel ® /2.4856,...
Surface passivation of all metallic, wetted parts e.g. SilcoNert ® 2000 or Dursan ®
1/4 NPT female
G1/4, Ermeto, Serto, Gyrolok, Swagelok, flanges
Other connections on request
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TECHNICAL DATA
7
7.2.1 Temperatures for all device versions
DANGER!
For devices to be used in hazardous areas, special temperature ranges apply. These can be found in the Ex supplementary instructions.
Device variant
Max. medium temperature
Permissible ambient temperatures
[ ° C]
150 100
DK32, DK34, DK37/M8M without electrical built-ins
DK32, DK34, DK37/M8M with limit switch I7S2002-N or SJ2-SN
DK32, DK34, DK37/M8M with limit switch SC2-N0
DK32, DK34 with transmitter ESK3x
DK37/M8E
-40
-40
-25
…
…
…
+70
+40
+40
-40 … +40
-40 … +40
-40
-40
-40
-40
-40
…
…
…
…
…
+90
+90
+90
+70
+70
Table 7-2: Permissible ambient temperatures for electronics variants in ° C and ° F
[ ° F]
302
-40...+158
-40...+104
-25...+104
-40...+104
-40...+104
212
-40...+194
-40...+194
-40...+194
-40...+158
-40...+158
Device variant Permissible medium temperatures
[ ° C]
DK34, DK32, DK37 without valve
DK32, DK37 with valve FPM/PTFE
DK32, DK37 with valve FFKM
DK32, DK37 with valve PTFE
-80
-25
-20
-40
…
…
…
…
+150
+150
+150
+150
Table 7-3: Permissible medium temperatures for gasket variants in ° C and ° F
[ ° F]
-112...+302
-13...+302
-4...+302
-40...+302
Device variant Permissible medium and ambient temperatures
[ ° C] [ ° F]
Max. ambient temperature 150 180 302 356
DK32 HT with FPM/PTFE, DK34 HT
(optional Reed contact)
DK32 HT with FFKM
(optional Reed contact)
-25
-20
…
…
+150
+200
-
-20
…
+180
-13...+302
-4...+392
-
-4...+356
Table 7-4: Permissible medium and ambient temperatures for high-temperature version DK32 HT/DK34 HT in ° C and ° F
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7
TECHNICAL DATA
DK32 - DK34 - DK37
7.2.2 Electrical connection data for indicator DK32, DK34, DK37/M8M with limit switch
DK32 - 34 /K./S
DK37/M8M
DK32 - 34 /K./S
DK37/M8M
DK32 - 34/K./L
Cable gland: M16 x 1.5
Terminal connection: 1.5 mm
2
Clamping range: 4.5...10 mm / 0.18...0.4"
Clamping range: 3...7 mm / 0.12...0.28"
Ø Connecting cable: 6.3 mm / 0.25"; 0.75 mm ²
Cable length: approx. 1.7 m / 5.6 ft (other lengths on request)
Limit switch
SIL2-compliant according to IEC 61508
Connection type NAMUR
Switching element function
Nominal voltage U
0
Pointer vane not detected
Pointer vane detected
DK32 - DK34 with Reed contact no
2-wire
Normally closed
8 VDC yes
2-wire
Normally closed
8 VDC yes
2-wire
Normally closed
8 VDC
≥ 3 mA
≤ 1 mA
≥
≤
3 mA
1 mA
≥
≤
3 mA
1 mA
Type: SPDT (3-wire, normally closed and normally open)
Switching reproducibility: < 5% of full scale range
Switching capacity: 12 VA 1
Max. switching capacity: 30 VDC 1
Max. switching current: 0.5 A 1
Table 7-5: Electrical connection data for indicator with limit switch
1 Reduced values for Ex
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TECHNICAL DATA
7
7.2.3 Electrical connection data for transmitter ESK3x for DK32, DK34
Cable entry
Clamping range of cable gland
Terminal connection
Measuring signal
Power supply
Power supply influence
Dependence on load impedance
Temperature influence
Max. external resistance / load
Min. load for HART ®
NAMUR type test acc. to NE 95
M16 x 1.5 or 1/2" NPT
3...7 mm / 0.12...0.28" (PA gland) or 5...10 mm / 0.2...0.39" (stainless steel gland)
1.5 mm
2
4...20 mA = 0 … 100% flow value in 2-wire technology
12...32 VDC (non-Ex)
< 0.1%
< 0.1%
<0.3%/10 K
500 Ω (24 VDC), 800 Ω (32 VDC)
250 Ω
Fulfills NE 21, NE 43, NE 107
ESK3x - electrical characteristics
Process variable flow rate
Upper range limit
Device error identification
Maximum
Multidrop operation
Min. U ext.
+103.125
< -2.5 or >106.25
112.5
-
12 VDC
ESK3x HART Device
Manufacturer name (code)
Model name
KROHNE Messtechnik (0x0045)
ESK3x (0x45BA)
Revision 7.6
HART ® protocol
Device revision
Equipment category
1
Transmitter
Table 7-6: Electrical connection data for transmitter ESK3x
20.5
< 3.6 or > 21
22.0
4.0
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7
TECHNICAL DATA
DK32 - DK34 - DK37
7.2.4 Electrical connection data for indicator DK37/M8E with electrical signal output
Cable gland
Clamping range
Terminal connection
Measuring signal
Power supply
Min. power supply for HART ®
Power supply influence
Dependence on load impedance
Temperature influence
Max. external resistance / load
Min. load for HART ®
Software firmware version
Identification number
NAMUR type test acc. to NE 95
M16 x 1.5
3...7 mm / 0.12...0.28"
2.5 mm
2
4...20 mA = 0 … 100% flow value in 2-wire technology
14.8...30 VDC
20.5 VDC
<0.1%
<0.1%
<10
µ
A/K
640 Ω (30 VDC)
250 Ω
01.15
3204090400
Fulfills NE 21, NE 43
M8E HART
®
configuration
Manufacturer name (code)
Model name
HART ® protocol
Device revision
Physical Layer
Equipment category
KROHNE Messtechnik (69)
M8E (230)
Revision 5.1
1
FSK
Transmitter
M8E process variable
Process variable flow rate
Upper range limit
Device error identification
Maximum
Multidrop operation
Min. U ext.
+102.5 ( ± 1%)
>106.25
112.5
-
14.8 VDC
Table 7-7: Electrical connection data for indicator with electrical signal output
20.24...20.56
≥ 21.00
22
4.5
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TECHNICAL DATA
7
7.2.5 Approvals
Standard Device version Marking
ATEX / IECEx
QPS (US/C)
Mechanical, without electrical built-ins II2G Ex h IIC T6...T3 Gb
II2D Ex h IIIC T150
°
C Db
NAMUR limit switch K1/K2 II2G Ex ia IIC T6 Gb
II2D Ex ia IIIC T75 ° C Db
II3G Ex nA/ec IIC T6 Gc
Reed limit switch R1
4...20 mA / HART signal output ESK3x
NAMUR limit switch K1/K2
II2G Ex ia IIC T6 Gb
II2G Ex d IIC T6 Gb
II2G Ex ia IIC T6 Gb
II2D Ex ia IIIC T75 ° C Db
II3G Ex nA/ec IIC T6 Gc
II2D Ex tb IIIC 75 ° Db
IS Class I,II,III Div 1 / Zone 1/21 AEx ia/Ex ia
NI Class I Div 2 / Zone 2 AEx nA/Ex nA
Reed limit switch R1
4...20 mA / HART signal output ESK3x
IS Class I Div 1 / Zone 1 AEx ia/Ex ia
IS Class I,II,III Div 1 / Zone 1/21 AEx ia/Ex ia
NI Class I Div 2 / Zone 2 AEx nA/Ex nA
XP Class I Div 1 / Zone 1 AEx db/Ex db
DIP Class II, III Div 1 / Zone 21 AEx tb/Ex tb
Other approvals as NEPSI, INMETRO, KCS, CCOE, EAC on request.
Table 7-8: Approvals for DK32, DK34
Standard Device version Marking
ATEX / IECEx
QPS (US/C)
Mechanical, without electrical built-ins II2G Ex h IIC T6...T3 Gb
II2D Ex h IIIC T150 ° C Db
Electrical II2G Ex ia IIC T6 Gb
II2D Ex ia IIIC T75 ° C Db
Electrical IS/I/1/ABCD; T6
Other approvals as NEPSI, INMETRO, KCS, CCOE, EAC on request.
Table 7-9: Approvals for DK37
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TECHNICAL DATA
DK32 - DK34 - DK37
7.3 Dimensions and weight
7.3.1 DK32, DK34
DK32 with top/bottom valve and rear process connection DK34 without valve and vertical process connection
1
Version with limit switch with connector
DK32 with bottom valve /
DK34 without valve
DK32 with top valve
2 a
[mm] ["]
1
2
DK32
DK34
42
42
Table 7-10: Dimensions and weight
1.66
1.66
Dimensions
[mm]
118
110 b
["]
4.65
4.33
[mm]
90
c
["]
3.55
-
[mm]
100
75 d
["]
3.94
3.07
g
700
600
Weight approx.
Version with limit switch with cable end
DK32 with bottom valve /
DK34 without valve
DK32 with top valve lb
1.54
1.32
3 a
[mm] ["]
3 DK32
DK34
46
Table 7-11: Dimensions and weight
1.81
b
Dimensions
[mm] approx.
90
["] approx.
3.55
[mm]
1500 c
Weight for DK32 with flow regulator: 2500 g / 5.51 lb
["]
59 d
[mm] approx.
50
["] approx.
1.97
g
700
600
Weight approx.
lb
1.54
1.32
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Version with flange adapter
DK32 with bottom valve DK32 with top valve
TECHNICAL DATA
7
DK34 without valve
4
Dimensions
4 DK32
[mm]
-
DK34 -
Table 7-12: Dimensions and weight a
["]
-
-
[mm]
250
250 b
["]
10.2
10.2
[mm]
90
c
["]
3.55
-
[mm] approx.
195
d
["] approx.
7.68
-
Extra weight for flange adapter dependent on pressure rating of flange: approx. 1.5...9 kg /
3.3...19.8 lb
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TECHNICAL DATA
7.3.2 DK32, DK34 with transmitter housing ESK3x
DK32 with ESK transmitter housing with top/bottom valve
DK32 - DK34 - DK37
1 a b
[mm]
1 DK32
Table 7-13: Dimensions
100
["]
3.94
[mm]
118
Total length of flange connection adapter:
DK32/ESK with top or bottom valve: 250 mm / 9.8"
["]
4.65
DK32 with transmitter ESK3x
DK34 with transmitter ESK3x
Table 7-14: Weight approx. g
1100
1000
[mm]
90 c
["]
3.55
approx. lb
2.43
2.21
[mm]
140 d
["]
5.51
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DK32 - DK34 - DK37
TECHNICAL DATA
7
7.3.3 DK37/M8M
With bottom valve and rear process connection
With top valve and rear process connection
Without valve and vertical process connection
1 a b
1
2
With valve
Without valve
[mm]
56
56
["]
2.21
2.21
[mm]
153
145
Table 7-15: Dimensions
Total length of flange connection adapter:
DK37/M8M with top/bottom valve: 250 mm / 9.8"
["]
6.03
5.71
DK37/M8M
DK37/M8M with flow regulator
DK37/M8M/R
DK37/M8M/R with flow regulator
Table 7-16: Weight approx. g
800
2600
2100
3900
2
[mm]
125
145 c
["]
4.92
5.71
[mm] approx.
144 approx.
144 d
["] approx.
5.67
approx.
5.52
approx. lb
1.76
5.73
4.63
8.60
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7
TECHNICAL DATA
DK32 - DK34 - DK37
7.3.4 DK37/M8E
With bottom valve and rear process connection
With top valve and rear process connection
Without valve and vertical process connection
1
DK37/M8E
DK37/M8E with flow regulator
DK37/M8E/R
DK37/M8E/R with flow regulator
Table 7-18: Weight
2 a b
1
2
3
With bottom valve
With top valve
Without valve
[mm]
56
56
56
["]
2.21
2.21
2.21
[mm]
153
183
145
Table 7-17: Dimensions
Total length of flange connection adapter:
DK37/M8E with bottom valve: 250 mm / 9.8"
DK37/M8E with top valve: 300 mm / 11.8"
["]
6.03
7.21
5.71
approx. g
1000
2800
2300
4100
3
[mm]
125
155
145 c
["]
4.92
6.11
5.71
[mm] approx.
144 approx.
144 approx.
121 d
["] approx.
5.67
approx.
5.67
approx.
4.77
approx. lb
2.21
6.18
5.07
9.04
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DK32 - DK34 - DK37
TECHNICAL DATA
7
7.3.5 Minimum distances when installing several measuring devices
When installing several measuring devices side by side, a minimum distance between them has to be observed.
Figure 7-2: Minimum distances when installing several measuring devices
Device [mm]
1
2
3
3
DK32, DK34
DK32/ESK, DK34/ESK
DK37/M8M
DK37/M8E
Table 7-19: Minimum distances in mm and inch
60
140
100
120
["]
2.36
5.51
3.94
4.73
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7
TECHNICAL DATA
DK32 - DK34 - DK37
7.4 Measuring ranges
7.4.1 Float
Measuring span:
Flow values:
10 : 1
Values = 100%; Water: +20 ° C / +68 ° F; Air: +20 ° C / +68 ° F, 1.013 bara / 14.7 psia
Cones Float
K 040
K 080
K 080
K 125
K 125
K 200
K 300
K 005
K 005
K 005
K 010
K 010
K 015
K 015
K 040
K 340
K 340
K 340 2
K 340 2
Table 7-20: Measuring ranges for floats
N3 titanium 1
N1 titanium 1
N1 stainless steel
N1 titanium 1
N1 stainless steel
N1 titanium 1
N1 stainless steel
N2 titanium 1
N2 stainless steel
N2 titanium 1
N2 stainless steel
N2 titanium 1
N2 stainless steel
N2 stainless steel
N2 stainless steel
N2 stainless steel
N2 Triamet
Special stainless steel
Special Triamet
Flow, water
[l/h]
40
60
80
10
16
25
25
100
150
200
250
5
7
3
3
-
-
-
1.5
[GPH]
11
16
21
2.6
4.2
6.6
6.6
26
40
53
66
0.8
0.8
1.3
1.8
-
-
-
0.4
Flow, air
[Nl/h]
400
550
800
-
1250
2000
2500
3400
4800
6000
8000
100
100
150
250
16
25
50
70
[SCFH]
50
75
100
15
20
30
-
125
180
225
300
6
10
4
4
0.6
1
2
2.6
Pressure loss
[mbar]
17
42
85
117
27
32
55
45
166
210
462
722
31
31
38
17
19
17
[psi]
0.25
0.39
0.47
0.8
0.65
0.61
1.23
1.7
0.45
0.45
0.55
0.25
0.28
0.25
2.4
3.01
6.7
10.5
1 Titanium components are not suitable for use in oxygen applications (media with an oxygen content that is significantly higher than the oxygen content in the earth's atmosphere)!
2 DK37 only
INFORMATION!
The operating pressure should be at least double the pressure loss for liquids and five times for gases. The indicated pressure losses are valid for water and air at maximum flow rate. Other flow ranges on request. Conversion of other media or operating data is performed using the calculation method in accordance with VDI/VDE directive 3513.
Flow measurements for gases are attributed to:
- Nl/h or Nm
3
/h: Volume flow at standard (norm.) conditions 0 ° C / +32 ° F, 1.013 bara / 14.7 psia
(DIN 1343)
- SCFM or SCFH: Volume flow at standard (std.) conditions +15 ° C / +59 ° F, 1.013 bara / 14.7 psia
(ISO 13443)
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TECHNICAL DATA
7
7.4.2 Valves (only DK32 and DK37)
Measuring span:
Flow values:
10 : 1
Values = 100%; Water: +20 ° C / +68 ° F; Air: +20 ° C / +68 ° F, 1.013 bara / 14.7 psia
Cones
Valve stem
Ø [mm] Ø ["] [l/h]
K 005 - K 010
K 015 - K 040 - K 080
K 125 - K 340
1
2.5
4.5
0.039
0.98
0.177
5
50
160
Table 7-21: Measuring ranges for valves (only DK32 and DK37)
Water
[GPH]
1.32
13.2
42.3
Max. flow Qv
[Nl/h]
100
1000
4300
Air
[SCFH]
3.72
37.2
160
Valve characteristic value
Kv Cv
[GPM]
[m
3
/h]
0.018
0.15
0.48
0.021
0.175
0.552
Table 7-22: Valve characteristics
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1 Flow, air
2 Flow, water
3 Spindle revolution n
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TECHNICAL DATA
DK32 - DK34 - DK37
7.5 Flow regulators for variable pressure (only DK32 and DK37)
Flow regulators are used (only DK32 and DK37) to guarantee constant flow during fluctuating inlet and outlet pressure. Minimum pressures are required to operate the regulators (refer to regulator characteristics).
INFORMATION!
Flow regulators are not equivalent to pressure regulators / pressure reducing valves!
1
Flow regulator for variable inlet pressure, type RE, NRE
The regulators keep the flow rate constant in the case of a variable inlet pressure and a constant outlet pressure.
RE-1000 Current flow rate:
Outlet pressure p2 constant:
Table 7-23: Example for flow regulator for variable inlet pressure
1000 l/h air
1.013 bara / 14.7 psia
The flow rate in the device remains constant with a fluctuating inlet pressure greater than 0.5 bar / 7.25 psi.
2
Flow regulator for variable outlet pressure, type RA, NRA
The regulators keep the flow rate constant in the case of a constant inlet pressure and a variable outlet pressure.
There must be a pressure differential between the inlet and the outlet pressure for the flow regulators to function. The inlet pressure p1 must always be greater than the outlet pressure p2.
RA-1000 Current flow rate: 800 l/h air
Inlet pressure p1 constant: 6 bar / 87 psi
Table 7-24: Example for flow regulator for variable outlet pressure
The flow rate in the device remains constant with a fluctuating outlet pressure greater than 0...5.5 bar / 0...79.8 psi.
1 Flow regulators for variable inlet pressure, type
RE and NRE
2 Flow regulators for variable outlet pressure, type RA and NRA
50
Table 7-25: Regulator characteristics www.krohne.com
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DK32 - DK34 - DK37
TECHNICAL DATA
7
7.5.1 Control ranges
Measuring span:
Flow values:
10 : 1
Values = 100%; Water: +20 ° C / +68 ° F; Air: +20 ° C / +68 ° F, 1.013 bara / 14.7 psia
Max. flow rate
Water Air
[l/h] [GPH] [Nl/h] [SCFH]
RE-1000
RE-4000
NRE-100
NRE-800
...40
...80
...100
...160
...2.5
-
-
...25
...11
...20
...25
...42
...0.6
-
-
...6.6
...1000
...2000
…
…
-
3000
...4000
...100
… 250
800
Table 7-26: Control ranges for flow regulator for variable inlet pressure 1
...37
...75
...110
...150
...3.7
...9.0
...30
-
Min. inlet pressure p1 [bar]
0.1
0.1
0.2
0.4
0.5
1
1.5
2 p1 [psi]
7.25
14.5
21.8
29
1.45
1.45
2.9
5.8
Max. flow rate Min. inlet pressure Min. pressure diff.
*
Water Air
[l/h] [GPH] [Nl/h] [SCFH] p1 [bar] p1 [psi] Δ p [bar] Δ p [psi]
RA-1000
RA-4000
NRA-800
...40
...100
-
...160
...1
-
-
...25
...11
...25
-
...42
...0.25
-
-
...6.6
...1000
…
...3000
...4000
...250
...500
…
-
2000
800
...37
...75
...110
...150
...9.0
...19
...30
-
Table 7-27: Control ranges for flow regulator for variable outlet pressure 2
0.5
1.5
1.5
2
0.1
0.2
0.4
0.4
7.25
21.8
21.8
29
1.45
2.9
5.8
5.8
0.4
1.2
1.2
1.5
0.05
0.1
0.2
0.4
5.8
17.4
17.4
21.8
0.73
1.45
2.9
5.8
* Differential pressure between inlet and outlet pressure
Flow measurements for gases are attributed to:
- Nl/h or Nm
3
/h: Volume flow at standard (norm.) conditions 0 ° C / +32 ° F, 1.013 bara / 14.7 psia
(DIN 1343)
- SCFM or SCFH: Volume flow at standard (std.) conditions +15 ° C / +59 ° F, 1.013 bara / 14.7 psia
(ISO 13443)
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TECHNICAL DATA
DK32 - DK34 - DK37
7.5.2 Technical data for flow regulators
Connection, standard
Connection, option
Max. operating gauge pressure (at +20
°
C / +68
°
F)
Medium temperature
Material
Gasket
Diaphragm
O-ring
Table 7-28: Technical data
1/4 NPT
Serto, Ermeto 6 or 8, hose nozzle 6 mm or 8 mm, Dilo, Gyrolok,
Swagelok, G1/4
64 barg / 928 psig
+150 ° C / +302 ° F
Stainless steel 1.4404
PTFE
Carbon/graphite-filled PTFE
FPM or FFKM
INFORMATION!
Higher pressures and temperatures, other connections or materials on request.
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TECHNICAL DATA
7
7.5.3 Dimensions with flow regulator
DK32 with flow regulator for variable inlet pressure DK37/M8M and M8E flow regulator for variable inlet pressure
DK32 with flow regulator for variable outlet pressure
DK37/M8E flow regulator for variable outlet pressure
[mm]
DK32
DK37
DK37/M8E 1
Table 7-29: Dimensions in mm and inch
230
230
230 approx. a
["]
9.1
9.1
9.1
1 With flow regulator for variable outlet pressure approx. b
[mm]
163
200
230
["]
6.4
7.9
9.1
[mm]
70
70
70 c
["]
2.8
2.8
2.8
[mm]
23
23
23 d
["]
0.91
0.91
0.91
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NOTES
DK32 - DK34 - DK37
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DK32 - DK34 - DK37
NOTES
8
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KROHNE – Process instrumentation and measurement solutions
• Flow
• Level
• Temperature
• Pressure
• Process Analysis
• Services
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: +49 203 301 0
Fax: +49 203 301 10389 [email protected]
The current list of all KROHNE contacts and addresses can be found at: www.krohne.com
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