KROHNE DK32 Series Wiring diagram

Variable area flowmeter with electrical built-ins
Equipment category II 2 G / II 2 D, EPL Gb / Db
in protection type intrinsic safety "i"
DK32 - DK34
DK32 - DK34DK32 - DK34
DK32 - DK34 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en

CONTENTS
2
www.krohne.com 12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
DK32 - DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 Approval according to the IECEx scheme ........................................................................ 3
1.4 Safety instructions............................................................................................................ 4
2 Device description 5
2.1 Device description ............................................................................................................ 5
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 6
2.4 Flammable products ........................................................................................................ 8
2.5 Equipment category .........................................................................................................8
2.6 Types of protection ........................................................................................................... 9
2.7 Ambient temperature / temperature classes................................................................ 10
2.8 Surface temperature for equipment category II 2 D...................................................... 13
2.9 Electrical data................................................................................................................. 13
3 Installation 14
3.1 Mounting ......................................................................................................................... 14
4 Electrical connections 15
4.1 General notes ................................................................................................................. 15
4.2 Grounding and equipotential bonding............................................................................ 17
5 Operation 18
5.1 Start-up........................................................................................................................... 18
5.2 Operation ........................................................................................................................ 18
5.3 Electrostatic charge .......................................................................................................18
6 Service 19
6.1 Maintenance ................................................................................................................... 19
6.2 Dismantling .................................................................................................................... 20
7 Notes 21

SAFETY INSTRUCTIONS 1
3
DK32 - DK34
www.krohne.com12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
1.1 General notes
This additional instruction applies to explosion-protected versions of variable area flowmeters
with electrical built-ins and the marking II 2 G and II 2 D or EPL Gb and Db.
It completes the standard manual for the non explosion-protected versions.
The information given in this instruction contains only the data relevant to explosion protection
of category 2.
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 on his own responsibility
conformity with the protection goals of directive 2014/34/EU for use in hazardous areas.
Conformity with harmonised standards was checked in accordance with EN 60079-0:2012 and
EN 60079-11:2012.
The EU declaration of conformity is based on the EU type examination certificate of the KIWA
ExVision:
If necessary, the EU type examination certificate can be downloaded from the manufacturer's
website.
1.3 Approval according to the IECEx scheme
Conformity with IECEx standards was tested in accordance with the "IECEx Certification Scheme
for Explosive Atmospheres" according to IEC 60079-0:2011 and IEC 60079-11:2011.
The number of the IEC certificate is:
KIWA 18ATEX0008 X
KIWA 18ATEX0008 XKIWA 18ATEX0008 X
KIWA 18ATEX0008 X
IECEx KIWA 18.0007X
IECEx KIWA 18.0007XIECEx KIWA 18.0007X
IECEx KIWA 18.0007X

1 SAFETY INSTRUCTIONS
4
DK32 - DK34
www.krohne.com 12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
1.4 Safety instructions
If these instructions are not followed, there is a risk of explosion.
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
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.

DEVICE DESCRIPTION 2
5
DK32 - DK34
www.krohne.com12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
2.1 Device description
Variable area flowmeters measure and display the flow of flammable and non-flammable gases
and liquids. Depending on the device version, one or two individually adjustable electrical limit
switch contacts can be installed in the indication unit.
The indication unit can also be equipped with a Reed contact or a 4...20 mA signal output with
HART
®
communication.
2.2 Description code
The safety description code consists of the following elements *:
* positions which are not needed are omitted (no blank positions)
Figure 2-1: Safety description code
1 32 - with valve and horizontal connection / 34 - without valve and vertical connection
2 RE - inlet pressure regulator / RA - outlet pressure regulator
3 K1 - one limit switch / K2 - two limit switches /
ESK - version with current output / R1 - version with Reed contact
4 S - plug connector / L - cable entry including cable
5 HT - high-temperature version
6 Marking without influence on the explosion safety protection
7 Ex - explosion-protected equipment
8 SK - SIL conformity according to IEC 61508 of the limit switch

2 DEVICE DESCRIPTION
6
DK32 - DK34
www.krohne.com 12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
2.3 Marking
The marking of the entire device is on the indication unit, where the following identification plate
can be found. An additional marking with the production number (P/A) is located inside of the
indication.
Figure 2-2: Example of a nameplate with limit switches
1 Device type
2 Manufacturer
3 Notified body ATEX
4 Rating data: temperature & pressure rating
5 Ex data according to KIWA 18ATEX0008 X or IECEx KIWA 18.0007X
6 Built-in equipment
7 Note to observe the documentation and for disposal
8 PED data

DEVICE DESCRIPTION 2
7
DK32 - DK34
www.krohne.com12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
Figure 2-3: Example of a nameplate with current output
1 Device type
2 Manufacturer
3 Notified body ATEX
4 Rating data: temperature & pressure rating
5 Ex data according to KIWA 18ATEX0008 X or IECEx KIWA 18.0007X
6 Built-in equipment
7 Note to observe the documentation and for disposal
8 PED data
Figure 2-4: Example of a nameplate with Reed contact
1 Device type
2 Manufacturer
3 Notified body ATEX
4 Rating data: temperature & pressure rating
5 Ex data according to KIWA 18ATEX0008 X or IECEx KIWA 18.0007X
6 Built-in equipment
7 Note to observe the documentation and for disposal
8 PED data

2 DEVICE DESCRIPTION
8
DK32 - DK34
www.krohne.com 12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
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 and EN 60079-11 in
category II 2 G or EPL Gb for use in zone 1.
Depending on the device version, variable area flowmeters are also designed in
category II 2 D or EPL Db for use in zone 21.
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:
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.
Definition of zone 21:
An area in which an explosive atmosphere may occasionally occur in the form of a cloud of
flammable dust in the air under normal operation.

DEVICE DESCRIPTION 2
9
DK32 - DK34
www.krohne.com12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
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 or Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 Gb or Ex ia IIC T6...T1 GbII 2G Ex ia IIC T6...T1 Gb or Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 Gb or Ex ia IIC T6...T1 Gb
The marking contains the following information:
The additional identification of the version for the equipment category II 2 D and EPL Db is:
II 2D Ex ia IIIC T85
II 2D Ex ia IIIC T85II 2D Ex ia IIIC T85
II 2D Ex ia IIIC T85°C...T140
C...T140C...T140
C...T140°C Db or Ex ia IIIC T85
C Db or Ex ia IIIC T85C Db or Ex ia IIIC T85
C Db or Ex ia IIIC T85°C...T140
C...T140C...T140
C...T140°C Db
C DbC Db
C Db
The marking contains the following information:
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 an intrinsically safe circuit with
protection level "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with protection level
"ia", a higher protection level is given.
II
IIII
II Explosion protection, group II
2
22
2Equipment category 2
D
DD
DDust ignition protection
Ex ia
Ex iaEx ia
Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIIC
IIICIIIC
IIIC Dust group, suitable for groups IIIC, IIIB and IIIA
T85
T85T85
T85°C...T140
C...T140C...T140
C...T140°C
CC
CMaximum surface temperature at +65°C / +149°F ambient temperature
Db
DbDb
Db EPL, suitable for zone 21
Table 2-2: Description of the marking
INFORMATION!
For the equipment category II 2 D or EPL Db, connection to an intrinsically safe circuit with
protection level "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with protection level
"ia", a higher protection level is given.

2 DEVICE DESCRIPTION
10
DK32 - DK34
www.krohne.com 12/2019 - 4007138001 - AD DK32-34 Exi Gb-Db R01 en
2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, no fixed temperature class is assigned to
variable area flowmeters. The temperature class of these devices is rather a function of the
present product temperature and ambient temperature. There is no distinction between devices
with one or two contacts.
The classification is outlined in the following tables.
The tables take into account the following parameters:
•Ambient temperature T
amb
•Product temperature T
m
•Feed power for version K. depending on the limit switches
INFORMATION!
The lowest ambient temperature for the version with limit switch of the type SC2-NO or Reed
contact HT is -25
° C/-13 ° F, for all other versions it is -40 ° C/-40 ° F.
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 standard 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 product temperature T
m
[°C]
T6
T6T6
T6 T5
T5T5
T5 T4
T4T4
T4 T3...T1
T3...T1T3...T1
T3...T1
Ambient
temperature 40 50 55 50 65 70 40 60 65 70 40 60 65 70
DK3./../ESK/. 85 85 85 100 100
190 1135 1105 1100 190 1140 1105 1100 190 1
Table 2-3: DK3./../ESK/./..-Ex permissible product and ambient temperatures in °C
1Heat-resistant cable and cable entry ≥90°C
Maximum permissible product temperature T
m
[°F]
T6
T6T6
T6 T5
T5T5
T5 T4
T4T4
T4 T3...T1
T3...T1T3...T1
T3...T1
Ambient
temperature 104 122 131 122 149 158 104 140 149 158 104 140 149 158
DK3./../ESK/. 185 185 185 212 212
1194 1275 1221 1212 1194 1284 1221 1212 1194 1
Table 2-4: DK3./../ESK/./..-Ex permissible product and ambient temperatures in °F
1Heat-resistant cable and cable entry ≥194°F