KROHNE DK32 Series Wiring diagram

Variable area flowmeter
with electrical built-ins
Equipment category Ex nl
DK32 DK34
DK32 DK34DK32 DK34
DK32 DK34 Supplementary instructions
Supplementary instructionsSupplementary instructions
Supplementary instructions
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CONTENTS
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DK32 DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 Conformity ........................................................................................................................ 3
1.3 Safety information ............................................................................................................ 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 4
2.3 Marking............................................................................................................................. 4
2.4 Flammable products ........................................................................................................ 5
2.5 Device category ................................................................................................................ 5
2.6 Types of protection ........................................................................................................... 5
2.7 Ambient temperature / temperature classes.................................................................. 6
2.8 Electrical data................................................................................................................... 7
2.9 Installation........................................................................................................................ 7
3 Electrical connections 8
3.1 General notes ................................................................................................................... 8
3.2 Earthing and equipotential bonding................................................................................. 8
4 Operation 9
4.1 Start-up............................................................................................................................. 9
4.2 Operation .......................................................................................................................... 9
5 Service 10
5.1 Maintenance ................................................................................................................... 10
5.2 Dismantling .................................................................................................................... 10
6 Notes 11
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SAFETY INSTRUCTIONS 1
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Safety instructions
1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with electrical built-ins and the marking Ex nL IIC T1...T6. They complement the Installation and
Operation Instructions for the non-explosion protected versions.
The information given in these Instructions contains only the data relevant to explosion
protection. The technical details given in the Installation and Operation Instructions for the non-
explosion protected versions apply unchanged unless excluded or superseded by these
Instructions.
1.2 Conformity
The DK32, DK34 variable-area flowmeters series has been approved by NEPSI (National
Supervision and Inspection Center for Explosion Protection and Safety of Instrumentation in
China) under Certification No.
This certificate can be downloaded under www.krohne.com.
1.3 Safety information
Mounting, installation, (initial) start-up and maintenance work in connection with
hazardous-duty equipment may only be carried out by personnel who have received
training in explosion protection!
GYJ05318
GYJ05318GYJ05318
GYJ05318
CAUTION!
The operator respectively his agent is responsible to follow further standards, directives or laws
if required due to operating conditions or place of installation.
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2DEVICE DESCRIPTION
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Device description
2.1 Device description
Variable area flowmeters are used to measure and display volume flows of flammable and non-
flammable gases and liquids. Depending on the device version, electrical limit switches can be
built into the indicator part.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
2.3 Marking
The type marking of the instrument is realized visibly with the rating plate shown below. The
interior of the display has an additional marking with the serial number (P/A).
1 32 - with valve and horizontal connection / 34 without valve and vertical connection
2 RE - inlet pressure regulator / RA - outlet pressure regulator
3 K1 - one limit switch / K2 - two limit switches
4 L - cable gland incl. cable
5 HT - high-temperature version
6 Ex - Explosion-protected equipment
1 Device type
2 Manufacturer
3 Year of manufaction
4 PED data
5 Sizing data: temperature & pressure rating
6 Ex-data
7 Built-in equipment
8 Note manual
9 KROHNE website
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DEVICE DESCRIPTION 2
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2.4 Flammable products
Atmospheric conditions
An explosive atmosphere is defined as a mixture of air and flammable gases, vapours, mists or
dusts under atmospheric conditions with the values
Tatm = -20°C...+60°C / -4°F...140°F and Patm = 0,8...1,1bar.
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Operating conditions
Variable area flowmeters operate outside of atmospheric conditions, which means that
explosion protection according to Directive 94/9/EC (ATEX) –regardless of the zone assignment
–is fundamentally not applicable due to the lack of key safety data for the interior of the
measuring section.
2.5 Device category
The series is certified in type of protection Ex nL for use in Zone 2.
2.6 Types of protection
The variable area flowmeter is designed with type of protection intrinsic safety, level of
protection nL.
The marking is: Ex nL IIC T6
Ex nL IIC T6Ex nL IIC T6
Ex nL IIC T6
CAUTION!
Operation with flammable products is only permissible if no explosive fuel/air mixture is formed
on the interior of the flowmeter under operating conditions. The user is responsible for the safe
operation of the flowmeter with regard to the temperatures and pressures of the products used.
In case of operation with flammable products the measuring sections must be included in the
periodic pressure tests of the system.
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
The marking contains the following information:
nL
nLnL
nL Intrinsically safe, level of protection level "nL"
IIC
IICIIC
IIC Suitable for gas groups IIC, IIB and IIA
T6
T6T6
T6 Suitable for temperature classes T6 ...T1
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2DEVICE DESCRIPTION
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2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, variable area flowmeters with built-in electrical
equipment (electric variants) are not assigned to any fixed temperature class. The temperature
class of these devices is rather a function of the product temperature and ambient temperature
that is present and the specific device version. Please see the following tables for the
assignments.
The tables take into account the following parameters:
•Ambient temperature Tamb.
•Product temperature Tm
DK3./../.././../.–Ex permissible medium and ambient temperatures
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
• The measuring device is installed and operated in accordance with the installation
instructions in the installation and operating manual.
• It must be ensured that the flowmeter is not heated by the effects of additional
heat radiation (sunshine, neighbouring system components) and
thus operated above the permissible ambient temperature range.
• Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.
Maximum permissible medium temperature
Ambient temperature Type DK32 Type DK34
Temperature
class
[°C] [°F] [°C] [°F] [°C] [°F]
T6 -20...+40 -4...+104 75 167 80 176
-20...+50 -4...+122 70 158 70 158
-20...+60 -4...+140 60 140 60 140
T5 -20...+40 -4...+104 100 212 100 212
-20...+50 -4...+122 95 203 100 212
-20...+60 -4...+140 85 185 90 194
T4 -20...+40 -4...+104 135 275 135 275
-20...+50 -4...+122 130 266 135 275
-20...+60 -4...+140 120 248 130 266
T3...T1 -20...+40 -4...+104 135 275 150 302
-20...+50 -4...+122 130 266 140 284
-20...+60 -4...+140 120 248 130 266
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DEVICE DESCRIPTION 2
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2.8 Electrical data
Design DK3./../.././../A–Ex
Irrespective of the instrument design the following values are to be observed for each
intrinsically safe circuit in case of interconnection:
The terminal assignment is according to the standard Installation and Operating Instructions.
2.9 Installation
Installation and setup must be carried out according to the applicable installation, installation
standards (e.g. EN 60079-14), by qualified personnel trained in explosion protection. The
information given in the Installation and Operation Instructions and the Supplementary
Installation and Operation Instructions must always be observed.
Variable area flowmeters must be installed in such a way that
•There are no external forces affecting the indicator part.
•The device is accessible for any visual inspections that are necessary, and can be viewed from
all sides.
•The nameplate is clearly visible.
•It can be operated from a location with secure footing.
Ui20 VDC
Ii25 mA
Pi64 mW
Type of limit switch CiLi
SC2-N0 150 nF 150 µH
SJ2-SN / SJ2-S1N 30nF 100 µH
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use for other than
the intended purpose. This applies in particular to hazards due to insufficient corrosion
resistance and suitability of the materials in contact with product.
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3ELECTRICAL CONNECTIONS
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Electrical connections
3.1 General notes
For version DK3./../../S/../.-Ex (plug), the separate intrinsically safe signal circuits with level of
protection "ia", "ib" or "nL" are electrically connected in the terminal compartment of the plug
housing and for version DK3./../../L/../.-Ex (connecting cable) it is the connecting cable as
illustrated in the connection diagram. Permissible maximum values (electrical data) must be
observed.
Connecting cable
The connecting cables must be selected according to prevailing installation standards (e.g.
EN 60079-14). The outer diameter of the connecting cable must be within the sealing range of
the cable entry. The connecting cables must be fixed and laid in such a way as to be sufficiently
protected against damage.
All cores that are not used must be securely connected to the earth potential of the hazardous
area or carefully insulated against each other and against earth (test voltage ≥500 Veff).
Cable entries / Blanking plugs
The DK3./../../S/../.-Ex variable area flowmeter is equipped with a connector. The connector
guarantees protection from foreign bodies and water (protection category) IP65 as per EN 60529.
The cable entry is closed with a plug. The plug is to be replaced with a suitable connecting cable
(nominal diameter range 6...9mm).
Limit switch connections
3.2 Earthing and equipotential bonding
If the device is not sufficiently electrostatically grounded via the process cables, an additional
earth connection must be established using the earth screw 1. The position of the ground
terminal is illustrated below. The connection guarantees only an electrostatic connection of the
device and does not comply with the requirements of an equipotential bonding connection.
DK32 - DK34
Contact Cable colors of assembled cable
Min minus white
Min plus yellow
Max minus green
Max plus brown
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OPERATION 4
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Operation
4.1 Start-up
Start-up is only permitted when the variable area flowmeter:
•is correctly installed in the system and connected.
•has been checked for the proper state with regard to its installation and connection
requirements.
The user of the system must have it checked before start-up in compliance with the national
regulations for checks before startup.
4.2 Operation
Setting of the limit switches may be carried out during operation. Remove the housing cover to
this purpose. The housing cover has to be closed immediately after the limit switches have been
set.
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5SERVICE
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Service
5.1 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular tests are required in order to maintain the proper
condition.
The following checks are recommended:
•Inspection of the housing, the cable entries and the feed lines for corrosion and damage.
•Checking the measuring section and the piping connections for leaks.
The cover is to be closed following maintenance work on the signal converter.
5.2 Dismantling
Replacing the display part
Due to the modular design of the variable area flowmeter, it is possible to replace a complete
display with an identical spare part in accordance with safety guidelines.
Exchanging the entire device
Removal and installation is the user's responsibility.
Any replacement and removal should take place in a de-energized state if possible. If that is not
possible, the basic conditions for intrinsic safety (e.g. no grounding or connection of different
intrinsically safe circuits to one another) must be observed during dismantling.
CAUTION!
There may be a loss of measuring accuracy!
CAUTION!
• Pressurized pipes must be depressurized before removing the measuring section.
• In the case of environmentally critical or hazardous products, appropriate safety precautions
must be taken with regard to residual liquids in the measuring unit.
• New seals must be used when re-installing the device in the piping.
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