KROHNE DK32 Series Wiring diagram

Variable area flowmeter with electrical built-ins
DK32 - DK34
DK32 - DK34DK32 - DK34
DK32 - DK34 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 02/2018 - 4002598202 - AD DK32/34 NEPSI Exi R02 en

CONTENTS
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DK32 - DK34
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 NEPSI conformity ............................................................................................................. 3
1.3 Approval according to the IECEx scheme ........................................................................ 4
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 ........................................................................................................ 7
2.5 Device category ................................................................................................................ 7
2.6 Protection types................................................................................................................ 8
2.7 Ambient temperature / temperature classes.................................................................. 9
2.8 Electrical data................................................................................................................. 10
3 Installation 11
3.1 Installation...................................................................................................................... 11
3.2 Special conditions and requirements ............................................................................ 11
4 Electrical connections 12
4.1 General notes ................................................................................................................. 12
4.2 Connection assignment.................................................................................................. 13
4.3 Grounding and equipotential bonding............................................................................ 13
5 Operation 14
5.1 Start-up........................................................................................................................... 14
5.2 Operation ........................................................................................................................ 14
6 Service 15
6.1 Maintenance ................................................................................................................... 15
6.2 Dismantling .................................................................................................................... 15

SAFETY INSTRUCTIONS 1
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1.1 General notes
These supplementary instructions apply to explosion-protected versions of variable area
flowmeters with electrical built-ins and the marking Ex i. It completes the standard
documentation 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 standard instructions for the non-explosion
protected versions apply unchanged unless excluded or superseded by these supplementary
instructions.
1.2 NEPSI conformity
Variable area flowmeters, type DK32 series and DK34 series have been approved by NEPSI
(National Supervision and Inspection Center for Explosion Protection and Safety of
Intrumentation). This product is in accordance with the following standards:
•GB 3836.1-2010 Explosive atmospheres - Part 1: Equipment - General requirements
•GB 3836.4-2010 Explosive atmospheres - Part 4: Equipment protection by intrinsic safety "i"
The certificate number is:
This certification together with its boundary conditions is required to be observed without fail.
GYJ17.1478X
GYJ17.1478XGYJ17.1478X
GYJ17.1478X
INFORMATION!
The Ex marking is NOT according to the ATEX directive. Placing the product on the market of the
EU for purpose of distribution and/or use in the EU is NOT permitted.

1 SAFETY INSTRUCTIONS
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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 and IEC 60079-11. The number of the IEC
certificate is:
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!
IECEx PTB 09.0025
IECEx PTB 09.0025IECEx PTB 09.0025
IECEx PTB 09.0025
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.

DEVICE DESCRIPTION 2
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2.1 Device description
Variable area flowmeters measure and display the volume flow of flammable and non-
flammable gases and liquids. The display houses one or two separately adjustable electrical
limit switches.
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
4 S - plug connector / L - cable gland incl. cable
5 HT - high-temperature version
6 A - limit switch tested for EC type approval or IECEx tested
7 Ex - Explosion-protected equipment

2 DEVICE DESCRIPTION
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2.3 Marking
The type marking of the device is realised visibly with the nameplate shown below. The interior of
the display has an additional marking with the serial number (P/A).
Figure 2-2: Example of nameplate
1 Manufacturer name and address
2 Product designation
3 Sizing data: temperature & pressure rating
4 PED data
5 Marking according to NEPSI and permissible ambient temperature range
6 Built-in equipment
7 Data matrix
8 Safety instructions, disposal symbol and China RoHs symbol

DEVICE DESCRIPTION 2
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2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
Atmospheric conditions:
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions. The following values define it:
T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar / 11.6...15.9 psi.
Outside of these ranges, for most mixtures no key figures are available for the ignition
behaviour.
Operating conditions:
Operating conditions:Operating conditions:
Operating conditions:
Variable area flowmeters operate outside of atmospheric conditions, which means that
explosion protection, 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
Variable area flowmeters are designed in accordance with GB 3836.1-2010 and GB 3836.4-2010
for use in zone 1.
The inside of the measuring unit is also approved for zone 1.
WARNING!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. 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 system. When using the device version H250/C...
(PTFE version, non-conductive) the minimum conductivity of the medium must be 10
-8
S/m, in
order to avoid danger from electrostatic charge.
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.

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2.6 Protection types
The variable area flowmeter is designed in the type of protection "intrinsic safety", protection
level "ia".
The marking for equipment protection level Gb is:
Ex ia IIC T1-T6 Gb
Ex ia IIC T1-T6 GbEx ia IIC T1-T6 Gb
Ex ia IIC T1-T6 Gb
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
The marking contains the following information:
Ex ia
Ex iaEx ia
Ex ia Explosion protection type "intrinsic safety", level of protection "ia"
IIC
IICIIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
T1-T6
T1-T6T1-T6
T1-T6 Temperature class range, suitable for temperature classes T1 to T6
Gb
GbGb
Gb EPL, suitable for zone 1 and zone 2
INFORMATION!
For the equipment protection level (EPL) Gb, connection to an intrinsically safe circuit with level
of protection "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with level of
protection "ia", a higher protection level is given.

DEVICE DESCRIPTION 2
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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. In fact, the
temperature class of these devices is a function of the present product temperature and ambient
temperature, as well as the specific device version.
The classification is outlined in the following tables
The tables take into account the following parameters:
•Ambient temperature T
amb
•Product temperature T
m
DK3./../.././../A-Ex permissible product 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 manufacturer's
installation instructions.
• 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.
Temperature
class
Ambient temperature Maximum permissible product temperature
with connector (S) or cable gland (L)
Type DK32 Type DK34
[°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
-20...+90 -4...+194 90 194 90 194
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
-20...+90 -4...+194 90 194 90 194

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2.8 Electrical data
The electronic signal output may only be connected to intrinsically safe circuits. Depending on
the device design, the following maximum values apply per circuit:
Design DK3./../.././../A-Ex
Irrespective of the device design, the following values are to be observed for each intrinsically
safe circuit in case of interconnection:
U
i
16 VDC
I
i
25 mA
P
i
64 mW
C
i
150 nF
L
i
150 µH