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2

 DEVICE DESCRIPTION 

16 

VA FLOWMETERS

www.krohne.com

09/2022 - 4000419908 - AD VA Mech Ex Gb-Db R08 en

2.9  Ignition hazard assessment / protective measures

Non-electrical variable area flowmeters were subject to an ignition hazard assessment in 

accordance with ISO 80079-36. The following table lists the ignition hazards considered and the 

protective measures carried out or to be carried out by the operator.

Device type

Ignition hazard Constructive protective 

measures

Construction site protective measures 

(note special conditions!)

All versions

Electrostatics

Electrostatic connection 

between conductive 

components, ground 

connection device

Include device in the equipotential bonding of 

the hazardous area.
For installations in hazardous areas of 

group IIC, observe the notes for the 

elimination of electrostatic charge.

Impact of 

sparking in 

measuring units

Float stop in measuring unit

Eliminate pressure surges in pipelines.

Impact of 

sparking on 

surfaces

Materials (without titanium)

None

Shock 

resistance

 

Glass cones

Tests with low energy

If the degree of mechanical risk is higher, 

protective measures on-site must be taken.

Shock 

resistance

 

Metal cones

Tests with high energy

None

Surface

 

temperatures

None, as no self-warming 

occurs

Note max. permissible product and ambient 

temperatures.

Oxygen in 

conjunction with 

titanium 

measuring units

None

Products with an oxygen content higher than 

21% V/V are not permitted.

H250 M40 / H250 

M8MG

Impact of 

sparking on 

titanium 

surfaces

Marking in the type marking 

(Ti)

Equipment with titanium surfaces may only 

be used in shock-resistant areas.

DK32 / DK34 / 

DK37

Marking with material code 

(e. g. 3.7025, 3.7035 or 3.7055) 

on the measuring unit

H250/C... 

Electrostatics

Minimum conductivity of the 
medium 

 10

-8

 S/m

Note the minimum conductivity of the 

medium.

VA40

Min. conductivity for liquids 

 10

-9

 S/m

Flow rate 

 5 * V

max

 with dust-

free gases and liquids

Note the minimum conductivity of the 

medium.

Note the maximum flow rate.

GA24

Flow rate 

 10 * V

max

 with 

dust-free gases and liquids

Note the maximum flow rate.

DK46 / DK47

 

DK48 / DK800

Flow rate 

 20 * V

max

 with 

dust-free gases and liquids

DK46PV / DK47PV

 

DK48PV / DK800PV

Min. conductivity for liquids 

 10

-9

 S/m

Flow rate 

 20 * V

max

 with 

dust-free gases and liquids

Note the minimum conductivity of the 

medium.

Note the maximum flow rate.

DK3x HT..

Corrosion

None

Exclude corrosive environmental conditions.

Table 2-6: Ignition hazard assessment / protective measures

Summary of Contents for DK 46

Page 1: ...ilt 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 2 G II 2 D VA FLOWMETERS Supplementary Instructions KROHNE...

Page 2: ...s 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 conditi...

Page 3: ...rer 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 ac...

Page 4: ...sembly 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...

Page 5: ...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 hig...

Page 6: ...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 vertic...

Page 7: ...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 f...

Page 8: ...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...

Page 9: ...0419908 AD VA Mech Ex Gb Db R08 en 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 H2...

Page 10: ...g 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 n...

Page 11: ...uring unit piping WARNING 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 ex...

Page 12: ...flammable dust in the air under normal operation Device type Gas range Dust range DK32 DK34 DK37 II 2G Ex h IIC T6 T3 Gb II 2D Ex h IIIC T150 C Db DK32 HT DK34 HT H250 M8MG II 2G Ex h IIC T6 T3 Gb II...

Page 13: ...ype Temp class Surface temperature Maximum permissible Ambient temperature in C Product temperature in C DK32 DK34 T6 T85 C 40 70 40 85 T5 T100 C 40 100 T4 T135 C 40 135 T3 T150 C 40 150 DK32 HT DK34...

Page 14: ...T275 F 25 275 25 275 T3 T392 F 25 392 25 392 DK37 M8M T6 T185 F 40 158 40 185 T5 T212 F 40 212 T4 T275 F 40 275 T3 T302 F 40 302 H250 M8MG T6 T185 F 40 158 40 185 T5 T212 F 40 212 T4 T275 F 40 275 T3...

Page 15: ...itself does not generate heat and for this reason the surface temperature is determined by the product temperature and in versions with heating jackets by the heating medium temperature as well The na...

Page 16: ...e must be taken Shock resistance Metal cones Tests with high energy None Surface temperatures None as no self warming occurs Note max permissible product and ambient temperatures Oxygen in conjunction...

Page 17: ...ers are tested on measuring units optional valves and controllers for shock resistance with 4 Joules in accordance with ISO 80079 36 for device group II with a low degree of mechanical risk The sight...

Page 18: ...n page 21 Unpainted indicators Unpainted DK3x HT indicators must not be used in corrosive environments 3 3 Grounding and equipotential bonding If the device is not sufficiently electrostatically groun...

Page 19: ...A Mech Ex Gb Db R08 en Figure 3 3 Ground terminal for DK37 M8M Figure 3 4 Ground terminal for H250 M8MG INFORMATION The indicator housing of M8M is made of conductive plastic Friction cannot cause ele...

Page 20: ...7 Ground terminal for GA24 INFORMATION The grounding and are equivalent INFORMATION The temperature at the electrostatic equalisation connector on the DK32 DK34 and DK37 measuring units corresponds to...

Page 21: ...sible temperatures and pressures 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 operatio...

Page 22: ...ctive built ins e g liners floats For all metal devices the measuring tube and the welded on process connections form a shield Faraday cage from which the electrical field cannot escape In glass devic...

Page 23: ...ommended Check the housing for corrosion or damage Check the measuring unit and the piping connections for leakage Check the measuring unit and the indicator for dust deposits Include the flowmeter in...

Page 24: ...suring unit in accordance with the standard manual for non explosion protected versions The measuring unit must be dismantled for cleaning This dismantling will need to be coordinated with operating c...

Page 25: ...NOTES 6 25 VA FLOWMETERS www krohne com 09 2022 4000419908 AD VA Mech Ex Gb Db R08 en...

Page 26: ...6 NOTES 26 VA FLOWMETERS www krohne com 09 2022 4000419908 AD VA Mech Ex Gb Db R08 en...

Page 27: ...NOTES 6 27 VA FLOWMETERS www krohne com 09 2022 4000419908 AD VA Mech Ex Gb Db R08 en...

Page 28: ...solutions Engineering commissioning calibration maintenance and training services Head Office KROHNE Messtechnik GmbH Ludwig Krohne Str 5 47058 Duisburg Germany Tel 49 203 301 0 Fax 49 203 301 10389...

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