KROHNE DK 46 Wiring diagram

Variable area flowmeter
Equipment category II 2 G, EPL Gb
in protection type intrinsic safety "i"
DK46 - DK800
DK46 - DK800DK46 - DK800
DK46 - DK800 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 05/2019 - 4000430905 - AD DK46-800 Exi-II2G R06 en

CONTENTS
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DK46 - DK800
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 Safety instructions............................................................................................................ 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 4
2.3 Marking............................................................................................................................. 5
2.4 Flammable products ........................................................................................................ 6
2.5 Equipment category .........................................................................................................6
2.6 Types of protection ........................................................................................................... 7
2.7 Ambient temperature / temperature classes.................................................................. 7
2.8 Electrical data................................................................................................................... 9
3 Installation 10
3.1 Mounting ......................................................................................................................... 10
3.2 Special conditions........................................................................................................... 11
4 Electrical connections 12
4.1 General notes ................................................................................................................. 12
4.2 Power supply .................................................................................................................. 12
4.3 Inputs / outputs .............................................................................................................. 12
4.4 Grounding and equipotential bonding............................................................................ 13
5 Operation 14
5.1 Start-up........................................................................................................................... 14
5.2 Operation ........................................................................................................................ 14
5.3 Electrostatic charge .......................................................................................................15
6 Service 16
6.1 Maintenance ................................................................................................................... 16
6.2 Dismantling .................................................................................................................... 16
7 Notes 17

SAFETY INSTRUCTIONS 1
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1.1 General notes
This additional instruction applies to explosion-protected versions of variable area flowmeter
with electrical built-ins with protection type intrinsic safety "i", equipment category II 2 G or
EPL Gb.
It completes the manual for the non explosion-protected versions.
The information given in this instruction contains only the data relevant to explosion protection.
The technical details given in the manual for the non explosion-protected versions remain
unchanged unless they will be excluded or replaced by this supplementary instruction.
1.2 EU conformity
The manufacturer declares with the EU declaration of conformity, in which the applied standard
is also specified, on his own responsibility conformity with the protection goals of directive
2014/34/EU for use in hazardous areas with gas.
The EU declaration of conformity for the equipment category II 2 G is based on the EC type
examination certificate of the Physikalisch Technische Bundesanstalt (PTB):
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these instructions.
If needed the EC type examination certificate can be downloaded from the manufacturer's
website.
1.3 Safety instructions
If these instructions are not followed, there is a risk of explosion.
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
PTB 05 ATEX 2021 X
PTB 05 ATEX 2021 XPTB 05 ATEX 2021 X
PTB 05 ATEX 2021 X
CAUTION!
The operator or his agent is responsible for observing any additional standards, directives or
laws if required due to operating conditions or place of installation.
This applies in particular to the use of easily detachable process connections when measuring
flammable media.
CAUTION!
When an equipment fault is detected the device shall be de-energised and send back to the
manufacturer for repair.

2 DEVICE DESCRIPTION
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2.1 Device description
Variable area flowmeters measure the volume flow of flammable and non-flammable gases and
liquids. Up to two separately adjustable electrical limit switches can be mounted in the local
indication.
2.2 Description code
The safety description code consists of the following elements *:
* positions which are not needed are omitted (no blank positions)
Figure 2-1: Safety description code
1 R - with integrated inlet pressure regulator (DKR46 only)
2 Device type
Device typeDevice type
Device type
46 - Overall length of measuring cone 65 mm / 2.6"
47 - Overall length of measuring cone 150 mm / 5.9"
48 - Overall length of measuring cone 300 mm / 11.8"
800 - Overall length of measuring cone 100 mm / 3.9"
3 Material for top and bottom fittings
Material for top and bottom fittingsMaterial for top and bottom fittings
Material for top and bottom fittings
N - brass / R - stainless steel / PV - PVDF
4 Differential pressure regulators
Differential pressure regulatorsDifferential pressure regulators
Differential pressure regulators
RE - inlet pressure regulator / RA - outlet pressure regulator
5 Limit switches
Limit switchesLimit switches
Limit switches
K1 - one limit switch / K2 - two limit switches

DEVICE DESCRIPTION 2
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2.3 Marking
The marking of the entire device is on the indication unit, in accordance with the description
code.
Additional markings on the measuring device
•SN - serial number
•SO - sales order / item
•Tag No. - measuring point identifier
•MD - manufacturing date
•PA - order number
•Vx - product configurator code
•AC - article code
Figure 2-2: Example of an identification plate
1 Device type
2 Manufacturer
3 Notified body ATEX
4 Rating data: temperature & pressure rating
5 PED data
6 Ex data
7 Electrical connection data
8 Internet site
9 Type of limit switch

2 DEVICE DESCRIPTION
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2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
Atmospheric conditions:
The standard atmospheric conditions under which it may be assumed that Ex equipment can be
operated are:
•Temperature: -20...+60°C / -4...+140°F
•Pressure: 80...110 kPa (0.8...1.1 bar) / 11.6...15.9 psi
•Air with normal oxygen content, typically 21%v/v
Ex equipment operating outside the standard temperature range must be tested and certified
(e.g. for ambient temperature range -40...+65°C / -40...+149°F).
Ex equipment operating outside the standard atmospheric pressure range and standard oxygen
content is not permitted.
Operating conditions:
Operating conditions:Operating conditions:
Operating conditions:
The measuring unit of variable area flowmeters operate outside the standard atmospheric
pressure range, which means that explosion protection, regardless of the zone assignment, is
fundamentally not applicable for the measuring unit (piping).
2.5 Equipment category
Variable area flowmeters are designed according to EN 60079-0:2012 + A11:2013 and
EN 60079-11:2012 in category II 2 G or EPL Gb for use in zone 1.
The inside of the measuring unit is also approved for zone 1.
CAUTION!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up inside of the piping at the same time the atmospheric conditions are exceeded.
The operator is responsible to ensure that the flowmeter is operated safely in terms of the
temperature and pressure of the products used. In case of operation with flammable products
the measuring units must be included in the periodic pressure tests of the piping.
INFORMATION!
Definition of zone 1 according to EN 1127-1, Appendix B:
An area in which an explosive atmosphere, as a result of the mixture of flammable substances in
the form of gas, steam or mist with air, under normal operation may occasionally occur.

DEVICE DESCRIPTION 2
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2.6 Types of protection
The variable area flowmeter is designed with protection type intrinsic safety "i" according to
EN 60079-11.
The identification for equipment category II 2 G or EPL Gb is:
II 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 GbII 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 Gb
The marking contains the following information:
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.
The classification is outlined in the following tables.
The tables take into account the following parameters:
•Built-in equipment
•Maximum values I
i
and P
i
for K1, K2
•Ambient temperature T
amb
•Product temperature T
m
When using more than one built-in equipment, the data of the most unfavourable equipment
should be used.
II
IIII
II Explosion protection, group II
2
22
2Equipment category 2
G
GG
GGas explosion protection
Ex ia
Ex iaEx ia
Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIC
IICIIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
T6...T1
T6...T1T6...T1
T6...T1 Temperature class range, suitable for temperature classes T6...T1
Gb
GbGb
Gb EPL, suitable for zone 1
Table 2-1: Description of the marking
INFORMATION!
For the equipment category II 2 G or EPL Gb, connection to separate intrinsically safe circuits
with protection level "ib" is required.
When connecting the variable area flowmeter to separate intrinsically safe circuits with
protection level "ia", a higher protection level is given.

2 DEVICE DESCRIPTION
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These values may be limited by the data contained in the manual.
The maximum values listed in the manual must be taken into consideration.
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
• The measuring device is installed and operated in accordance with the manufacturer's
installation instructions.
• It must be ensured that the measuring device is not heated by the effects of additional heat
radiation (sunshine, adjacent plant parts) 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.
Type of limit
switch
Maximum permissible ambient / product temperature in °C
Supply
Type 1 Type 2 Type 3
Temperature class
T6 T5 T4...T1 T6 T5 T4...T1 T6 T5 T4...T1
RC10-14.-N0...
RC15-14.-N0... 65 65 65 65 65 65 50 65 65
RC10-14.-N3... 70 75 75 65 75 75 50 65 75
RC15-14.-N3... 70 70 70 65 70 70 50 65 70
I7R2010-N***
I7R2015-N*** 70 80 80 65 80 80 50 65 80
I7R2010-NL***
I7R2015-NL*** 70 80 80 70 80 80 65 80 80
The lowest permissible ambient temperature is -20°C
Table 2-2: Temperature table in °C
Type of limit
switch
Maximum permissible ambient / product temperature in °F
supply
Type 1 Type 2 Type 3
Temperature class
T6 T5 T4...T1 T6 T5 T4...T1 T6 T5 T4...T1
RC10-14.-N0...
RC15-14.-N0... 149 149 149 149 149 149 122 149 149
RC10-14.-N3... 158 167 167 149 167 167 122 149 167
RC15-14.-N3... 158 158 158 149 158 158 122 149 158
I7R2010-N***
I7R2015-N*** 158 176 176 149 176 176 122 149 176
I7R2010-NL***
I7R2015-NL*** 158 176 176 158 176 176 149 176 176
The lowest permissible ambient temperature is -4°F
Table 2-3: Temperature table in °F

DEVICE DESCRIPTION 2
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2.8 Electrical data
Built-in equipment for the variable area flowmeter may only be connected to separate
intrinsically safe circuits with the following maximum values:
Electrical equipment Nominal voltage Nominal current
Electrical data for limit switches K1 / K2 8VDC ≤1 / ≥3mA
Table 2-4: Electrical data for limit switches K1 / K2
Maximum values
Built-in equipment U
i
[V] I
i
[mA] P
i
[mW] C
i
[nF] L
i
[μH]
RC10-14.-N0.../RC15-14.-N0...
I7R2010-N***/I7R2015-N*** 16 25 34 210 100
25 64
52 169
RC10-14.-N3...
I7R2010-NL*** 16 25 34 150 120
25 64
52 169
RC15-14.-N3...
I7R2015-NL*** 16 25 34 150 70
25 64
52 169
Table 2-5: Maximum values for intrinsically safe circuits
WARNING!
Also, when operating the variable area flowmeter outside of the hazardous area, the connection
must be made to intrinsically safe circuits.
When connecting to non-intrinsically safe circuits, there is a risk of damage to the safety-
defining components.

3 INSTALLATION
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3.1 Mounting
Mounting and setup must be carried out according to the applicable installation standards
(e.g. EN 60079-14) by qualified personnel trained in explosion protection. The information given
in the manual and the supplementary instructions must always be observed.
Panel mounting
After installing and adjusting the electrical equipment and/or mounting of the protective cover,
tighten the screws with 0.7 Nm on the front 1and back 2of the variable area flowmeter.
Variable area flowmeters must be installed in such a way that
•there is no danger from mechanical impact effects.
•there are no external forces affecting the indicator part.
•the device is accessible for any necessary visual inspections and can be viewed from all sides.
•the nameplate is clearly visible.
•it can be operated from a location with secure footing.
Figure 3-1: Position of screws for panel mounting
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use other than the
intended purpose. This applies in particular to hazards due to insufficient corrosion resistance
and suitability of the materials in contact with product.
DANGER!
Components made of titanium in oxygen applications
Components made of titanium in oxygen applicationsComponents made of titanium in oxygen applications
Components made of titanium in oxygen applications
Variable area flowmeters with titanium components are NOT
NOTNOT
NOT suitable for use in explosion-
protected areas in conjunction with oxygen applications (products with an oxygen content which
is significantly above the oxygen content in the earth's atmosphere)!

INSTALLATION 3
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3.2 Special conditions
Flammable products
Observe the information regarding flammable products.
For further information refer to
Flammable products on page 6.
Thermal data
Observe the maximum ambient and product temperatures.
For further information refer to
Ambient temperature / temperature classes on page 7.
Electrostatics
To avoid electrostatic charging, connect the variable area flowmeters to the equipotential
bonding system of the hazardous area.
Observe additional information regarding electrostatics. For further information refer to
Electrostatic charge on page 15.

4 ELECTRICAL CONNECTIONS
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4.1 General notes
The built-in equipment is connected electrically in the connection box. The circuits are designed
in protection type "intrinsically safe" and galvanically isolated from ground (test voltage
≥500 V
eff
).
The connecting cables should be selected according to the applicable installation standards
(e.g. EN 60079-14) and the maximum operating temperature. Ensure that no residual current
can form between separate intrinsically safe signal circuits.
•The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
•Not used cores must be securely connected to the earth potential of the hazardous area or
carefully insulated against each other and against earth (test voltage ≥500 V
eff
).
•Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring unit and the connecting cable.
•Supplied blind plugs / cable entries guarantee protection against foreign objects and water
(ingress protection) IP65 according to EN 60529.
•The outer diameter of the connecting cable must be within the sealing range of the cable
entry (3...7 mm / 0.12...0.27").
Ensure that the gaskets and incised gasket ring are tight.
4.2 Power supply
The variable area flowmeter does not require a separate power supply.
4.3 Inputs / outputs
The terminal assignment of the built-in electrical equipment is described in the standard
documentation. The signal circuits of the variable area flowmeters may only be connected to
certified intrinsically safe slave units or circuits. For more information refer to chapter
"Electrical data".

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

5 OPERATION
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5.1 Start-up
Make the following checks before starting up the device:
•Suitability of the materials used for the measuring unit and for the gaskets for adequate
resistance to corrosion from the product.
•Correct connection of the built-in electrical equipment.
•Visual inspection for damage of the exposed wire lines of the ring initiator inside of the
indicator.
•Observe the additional mounting information for the panel mounting versions.
For further information refer to
Mounting on page 10.
5.2 Operation
Variable area flowmeters must be operated in such a way that they remain within the maximum
and minimum permissible temperatures and pressures and the electrical limit values.
Variable area flowmeters may only be operated if the equipment parts necessary for safety are
effective in the long run, and are not rendered inoperable during operation.
Adjusting the limit switch during operation is permitted. To do so, first remove the protective
cover. Use the two clamping screws 1to fasten the limit switch 2to the back rail 3of the
variable area flowmeter.
Close the protective cover immediately after adjusting the limit switch.
Observe the additional mounting information for the panel mounting versions.
For further information refer to
Mounting on page 10.
Figure 5-1: Fastening the limit switch
CAUTION!
Avoid pinching or damaging the wire line of the limit switches when setting the switches and
closing the cover. It should be laid in the grooves of the back rail. In case of damage, the variable
area flowmeter must be replaced!

OPERATION 5
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5.3 Electrostatic charge
In variable area flowmeters, it is possible under field conditions for charge separation to occur in
the measuring tube due to the transport of non-conductive fluids and / or when the flow comes
into contact with non-conductive built-ins.
In glass devices, it is basically possible for the electrostatic field generated inside the measuring
tube to "punch through" to the outside of the device.
For that reason, variable area flowmeters need to be permanently grounded by the operator via
the process connections in order to allow discharge of electrostatic build-up.
The operator is also responsible for continuing the complete grounding of the process line.
If grounding cannot be made via the process connections, e.g. top and bottom fittings are made
of plastic, the flowmeter should be connected to the local ground potential via the connection to
ground. The connection only ensures electrostatic grounding of the device and does not comply
with the requirements of an equipotential bonding connection.
When dust-free gases or liquids are measured, the flow rate should not exceed 20 times the
nominal flow rate. The max. allowable operating pressure PS printed on the nameplate is to be
considered.
In order to avoid ignition hazards due to electrostatic charge, variable area flowmeters
may not be used in areas with:
•processes that generate strong charges,
•mechanical friction and cutting processes,
•spraying of electrons (e.g. in the vicinity of electrostatic painting systems) or
•pneumatically conveyed dust is exposed.
WARNING!
Electrostatic charging of the housing surface by friction must be avoided. The devices must not
be dry cleaned.

6 SERVICE
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6.1 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular tests are required in order to maintain the proper
condition.
The following checks are recommended:
•Check the housing, the cable entry and the feed lines for corrosion or damage.
•Check the measuring unit and the piping connections for leakage or damages of the glass
cone.
•Include the flowmeter in the scheduled periodic inspection the process line and fittings.
6.2 Dismantling
Exchanging the entire device
The dismantling and installation is within the responsibility of the operator.
Before disconnecting the electric connecting cable of the device, make sure that all cables
leading to the indication unit are isolated from the ground of the hazardous area.
This also applies to functional earth conductors (FE) and equipotential bonding conductors (PA).
Preventive 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.
WARNING!
• Pressurised pipes have to be depressurised before removing the measuring unit.
• In the case of environmentally critical or hazardous products, appropriate safety precautions
must be taken with regard to residual liquids in the measuring unit.
• New gaskets have to be used when re-installing the device in the pipeline.

NOTES 7
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7 NOTES
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NOTES 7
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• Flow
• Level
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• Process Analysis
• Services
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.: [phone]
Fax: [phone]
[email protected]
© KROHNE 05/2019 - 4000430905 - AD DK46-800 Exi-II2G R06 en - Subject to change without notice.
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