KROHNE DK32 Series Wiring diagram

Variable area flowmeters
without electrical built-ins
Type series DK32, DK34, DK37 M8M, DK37 M8MR, H250 M8MG, H250 M8MGR,
H250 M40, H250 M40R, DK46, DK47, DK48, DK800, GA24, VA40
Equipment category II 2G, II 2D
VA FLOWMETERS Supplementary Instructions
© KROHNE 09/2022 - 4000419908 - AD VA Mech Ex Gb-Db R08 en

CONTENTS
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VA FLOWMETERS
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EU conformity ................................................................................................................... 3
1.3 UK conformity................................................................................................................... 3
1.4 Safety instructions............................................................................................................ 4
2 Device description 5
2.1 Device description ............................................................................................................ 5
2.2 Designation code .............................................................................................................. 5
2.3 Marking............................................................................................................................. 8
2.4 Flammable products ...................................................................................................... 11
2.5 Equipment category ....................................................................................................... 12
2.6 Types of protection ......................................................................................................... 12
2.7 Ambient temperature / Product temperature ............................................................... 13
2.8 Surface temperature...................................................................................................... 15
2.9 Ignition hazard assessment / protective measures ...................................................... 16
3 Installation 17
3.1 Mounting......................................................................................................................... 17
3.2 Special conditions........................................................................................................... 17
3.3 Grounding and equipotential bonding............................................................................ 18
4 Operation 21
4.1 Start-up........................................................................................................................... 21
4.2 Operation ........................................................................................................................ 21
4.3 Static electricity.............................................................................................................. 21
4.3.1 Electrostatic charge caused by ambient conditions ............................................................ 21
4.3.2 Charging non-conductive external parts by cleaning .......................................................... 22
4.3.3 Process dependent charging................................................................................................ 22
5 Service 23
5.1 Dismantling .................................................................................................................... 23
5.2 Maintenance ................................................................................................................... 23
6 Notes 25

SAFETY INSTRUCTIONS 1
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1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with protection type "design safety c", category II 2G, category II 2D.
They complete 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 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 requirements of directive 2014/34/EU for use in hazardous areas with gas
and dust.
Conformity with the regulations was checked by the manufacturer in accordance with
ISO 80079-36:2016 und ISO 80079-37:2016.
Third party certification is not required in accordance with the conformity assessment procedure
for non-electrical equipment group II according item 13, section 1b (ii) of the directive
2014/34/EU (ATEX).
The technical documentation has been stored at the Physikalisch- Technische Bundesanstalt
(PTB), Braunschweig, Germany under the registration number:
The "X" after the registration number refers to special conditions for safe use of the device,
which have been listed in these instructions.
1.3 UK conformity
The manufacturer declares with the UK declaration of conformity on his own responsibility
conformity with the requirements of UKSI 2016:1107 (as amended by UKSI 2019:696 –
Schedule 3A, Part 6) for use in hazardous areas with gas and dust.
Conformity with the regulations was checked by the manufacturer in accordance with
ISO 80079-36:2016 und ISO 80079-37:2016.
Third party certification is not required in accordance with the conformity assessment procedure
for non-electrical equipment group II according amendment to regulation 39.
PTB 03 ATEX D127 X

1 SAFETY INSTRUCTIONS
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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.

DEVICE DESCRIPTION 2
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2.1 Device description
Variable area flowmeters measure and display the flow of flammable and non-flammable gases
and liquids.
2.2 Designation code
The safety designation code consists of the following elements *:
Figure 2-1: Safety designation code for the type series of DK32 / DK34
1 Type series of measuring unit DK
32 - with valve and horizontal connection
34 - without valve and vertical connection
2 Optional flow regulator
RE - for variable inlet pressure
RA - for variable outlet pressure
3 High-temperature version
HT - high-temperature version
4 Version
Ex - explosion-protected equipment
Figure 2-2: Safety designation code for the type series of DK37/M8M
1 Type series of DK37, optional with needle valve
2 Type series of M8M, mechanical indicator
3 Design of indicator housing
without - indicator housing in PPS
R - indicator housing in stainless steel
4 Optional flow regulator
RE - for variable inlet pressure
RA - for variable outlet pressure

2 DEVICE DESCRIPTION
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Figure 2-3: Safety designation code for the type series of H250/M8MG
1 Type series of measuring unit H250
2 Materials / versions
RR - stainless steel
C - PTFE or PTFE with ceramic liner
HC - Hastelloy®
Ti - Titanium
MO - Monel
IN - Inconel
F - Food
3 Type series of indicators - M8
4 Design of indicator M8
MG - mechanical indicator
5 Design of indicator housing
without - indicator housing in PPS
R - indicator housing in stainless steel
6 Version
Ex - explosion-protected version
Figure 2-4: Safety description code for the type series of H250 M40
1 Type series of measuring unit H250
H250 - standard version, vertical upwards
H250H - horizontal orientation
H250U - vertical downwards
2 Measuring unit materials / versions
RR - stainless steel
C - PTFE or PTFE/ceramics
HC - Hastelloy® C
Ti - Titanium
MO - Monel
IN - Inconel
F - Food
3 Heating jacket version
blank - without heating jacket
B - with heating jacket
4 Signal converter version
M40 - aluminium housing, painted (standard)
M40R - stainless steel housing
5 High-temperature version
blank - without HT extension
HT - with HT extension
6 Version
Ex - explosion-protected version

DEVICE DESCRIPTION 2
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* positions which are not needed are omitted (no blank positions)
Figure 2-5: Safety designation code for the type series of DK glass
1 R - with integrated inlet pressure regulator (DKR46 only)
2 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
N - brass
R - stainless steel
PV - PVDF
4 Flow regulator
RE - flow regulator for variable inlet pressure
RA - flow regulator for variable outlet pressure
Figure 2-6: Safety designation code GA24
1 Material of connection
R - stainless steel
PTFE - stainless steel with PTFE
Figure 2-7: Safety designation code VA40
1 Connection type
V - screw connection
S - tube socket
F - flange connection
A - aseptic connection, conforming to food standards
2 Material of connection
R - stainless steel 1.4404 (316 L)
ST - steel, electroplated and chromised
PV - plastic PVDF

2 DEVICE DESCRIPTION
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2.3 Marking
The flowmeters are identified by the following nameplates (examples are not to scale):
Nameplate DK32, DK34, DK32 .. HT, DK34 .. HT
Figure 2-8: Example of a nameplate for DK32 HT (ATEX)
Nameplate DK32, DK34, DK32 .. HT, DK34 .. HT
Figure 2-9: Example of a nameplate for DK32 HT (UKCA)
DK32 ... HT
P/A: 123456789.001
S/N: D################
TS: 200°C
PS: ... bar Ptmax: ... bar
PED/G1/4.3/SEP
Luft / air
0.0181 mPa s 1.013 bar abs.
1.293 kg/Nm3
20°CTag-No: ###################
Reg.No.PTB03ATEXD127X
II2G Ex h IIC T6...T3 Gb
II2D Ex h IIIC T200°C Db
Tamb -25°C ... +200°C
IP: 66/68
MD: 20##
PESR/G1/8/SEP

DEVICE DESCRIPTION 2
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Nameplate H250/M40, DK37/M8M, DK37/M8M/R, H250/M8MG, H250/M8MG/R
Figure 2-10: Example of a nameplate for H250 M40 (ATEX)
Nameplate H250/M40, DK37/M8M, DK37/M8M/R, H250/M8MG, H250/M8MG/R
Figure 2-11: Example of a nameplate for H250 M40 (UKCA)

2 DEVICE DESCRIPTION
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•SN - serial number and/or PA - production order number
•MD - manufacturing date
•PS - max. operating pressure (Pressure Specified)
•PT max. - max. test pressure (Pressure Test max.)
•TS - max. operating temperature (Temperature Specified)
•PED / PESR - Pressure Equipment Directive / Pressure Equipment Safety Regulation
•Tag-No. - tag identifier
•Reg.No. - registration number
•Tamb. - max. ambient temperature
•VG - V number, Germany
•SO - order number
•PA - production order number
•AC - article code
Nameplate VA40, GA24, DK46, DK47, DK48, DK800
Figure 2-12: Example of a nameplate for VA40 (ATEX)
Nameplate VA40, GA24, DK46, DK47, DK48, DK800
Figure 2-13: Example of a nameplate for VA40 (UKCA)
XXXXXXXXX
XXXXXXXXX/XXX XXXXXXXXX XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
XX
XXXXXXXXXX /XX/XX/XX
XXXXXX XXX
10020
CAUTION!
The values stated on the nameplates (indicated with XXX) vary according to the individual device
versions and can be found on the respective nameplate or standard manual for the device.