DK37/M8 - H250/M8
DK37/M8 - H250/M8
DK37/M8 - H250/M8DK37/M8 - H250/M8
Variable area flowmeter
with electrical built-ins
Equipment category II 2 G
Supplementary Instructions
Supplementary Instructions
Supplementary InstructionsSupplementary Instructions
© KROHNE 01/2016 - 4000760404 - AD DK37 M8 Ex II2G R04 en
CONTENTS
DK37/M8 - H250/M8
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 Safety instructions............................................................................................................ 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 6
2.4 Flammable products ........................................................................................................ 7
2.5 Device category ................................................................................................................ 7
2.6 Types of protection ........................................................................................................... 7
2.7 Ambient temperature / temperature classes.................................................................. 8
2.8 Electrical data................................................................................................................. 10
3 Installation 11
3.1 Installation...................................................................................................................... 11
4 Electrical connections 12
4.1 General notes ................................................................................................................. 12
4.2 Earthing 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
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DK37/M8 - H250/M8
1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with electrical built-ins and the marking II 2 G. They complete the installation and operation
instructions for the non-explosion protected versions.
The information given in these instructions contains only the data relevant to category 2
explosion protection. The technical details given in the installation and operation instructions for
the non-explosion protected versions apply unchanged unless excluded or superseded by these
instructions.
1.2 EC conformity
Under his sole responsibility, the manufacturer hereby declares conformity with the protection
goals of Directive 94/9/EC for use in hazardous areas.
The EC Type Examination Certificate of the Physikalisch Technische Bundesanstalt (PTB) forms
the basis of the EC Declaration of Conformity:
SAFETY INSTRUCTIONS
1
If required the EC Type Test Certificate can be downloaded under www.krohne.com.
1.3 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.
PTB 01 ATEX 2202
PTB 01 ATEX 2202
PTB 01 ATEX 2202PTB 01 ATEX 2202
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DEVICE DESCRIPTION
2.1 Device description
Variable area flowmeters are used to measure and display volume flows of flammable and nonflammable gases and liquids.
The M8E 1 indicator houses a signal output 4...20 mA with a bar graph indicator.
The M8M 2 indicator houses two separately adjustable electrical limit switches.
DK37/M8 - H250/M8
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DK37/M8 - H250/M8
2.2 Description code
Type series H250
Type series H250
Type series H250Type series H250
The safety description code * consists of the following elements:
1 Type series measuring unit H250
2 Materials / versions
RR - Stainless Steel
C - PTFE or PTFE with ceramic liner
HC - Hastelloy
Ti - Titanium
F - aseptic version (food)
3 Series of indicators
M8 - Indicator M8
DEVICE DESCRIPTION
2
4 Design of indicator M8
MG - Mechanical indicator
EG - Electronic indicator with signal output 4...20 mA
5 Limit switch - M8MG design
K1 - Design with a limit switch (upper or lower)
K2 - Design with two limit switches
Type series measuring unit DK37
Type series measuring unit DK37
Type series measuring unit DK37Type series measuring unit DK37
The safety description code * consists of the following elements:
1 Type series measuring unit DK37
2 M8 indicator type series
3 Design of indicator
M - Mechanical indicator
E - Electronic indicator with signal output 4...20 mA
4 Differential pressure regulators
RE - inlet pressure regulator
RA - outlet pressure regulator
5 Limit switch (only M8M indicator)
K1 - One limit switch
K2 - Two limit switches
* positions which are not needed are omitted (no blank positions)
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