KROHNE DK37/M8 Wiring diagram

Variable area flowmeter
Equipment protection level Gb
in type of protection Intrinsic Safety "i"
DK37/M8 - H250/M8
DK37/M8 - H250/M8DK37/M8 - H250/M8
DK37/M8 - H250/M8 Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
Supplementary Instructions
© KROHNE 11/2017 - 4002616802 - AD DK37 NEPSI Ex ia R02 en

CONTENTS
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DK37/M8 - H250/M8
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 NEPSI 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............................................................................................................... 6
2.3 Marking............................................................................................................................. 8
2.4 Flammable products ........................................................................................................ 9
2.5 Device category ................................................................................................................ 9
2.6 Protection types.............................................................................................................. 10
2.7 Ambient temperature / temperature classes / product temperature .......................... 11
2.8 Electrical data................................................................................................................. 13
3 Installation 14
3.1 Mounting ......................................................................................................................... 14
3.2 Special conditions and requirements ............................................................................ 14
4 Electrical connections 15
4.1 General notes ................................................................................................................. 15
4.2 Power supply .................................................................................................................. 16
4.3 Inputs/outputs ................................................................................................................ 16
4.4 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 .................................................................................................................... 19

SAFETY INSTRUCTIONS 1
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DK37/M8 - H250/M8
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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 DK37/M8 and H250/M8 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.
1.3 Approval according to the IECEx scheme
Conformity for use in hazardous areas with gas and dust 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:
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 IEC certificate can be downloaded from the manufacturer's website.
GYJ17.1417X
GYJ17.1417XGYJ17.1417X
GYJ17.1417X
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.
IECEx KIWA 15.0020 X
IECEx KIWA 15.0020 XIECEx KIWA 15.0020 X
IECEx KIWA 15.0020 X

1 SAFETY INSTRUCTIONS
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DK37/M8 - H250/M8
www.krohne.com 11/2017 - 4002616802 - AD DK37 NEPSI Ex ia R02 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.

DEVICE DESCRIPTION 2
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DK37/M8 - H250/M8
www.krohne.com11/2017 - 4002616802 - AD DK37 NEPSI Ex ia R02 en
2.1 Device description
Variable area flowmeters measure and display the volume flow of flammable and non-
flammable gases and liquids.
The M8E. 1indicator has a signal output 4...20 mA with a bargraph indicator.
The M8M. 2indicator has up to two separately adjustable electrical limit switches.