KROHNE H250 M9 Wiring diagram

Variable area flowmeter
Equipment category II 3 G and II 3 D with electrical components
in protection type non-sparking 'nA' and
in protection type equipment - dust ignition protection 't'
H250 M9
H250 M9H250 M9
H250 M9 Supplementary instructions
Supplementary instructionsSupplementary instructions
Supplementary instructions
© KROHNE 04/2015 - 4000646002 MA H250/M9-Ex-II3GD-AD-R06-en

CONTENTS
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H250 M9
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 Security information......................................................................................................... 3
2 Device description 4
2.1 Device description ............................................................................................................ 4
2.2 Description code............................................................................................................... 4
2.3 Marking............................................................................................................................. 5
2.4 Flammable products ........................................................................................................ 6
2.5 Equipment category .........................................................................................................6
2.6 Types of protection ........................................................................................................... 7
2.6.1 Type of protection for gas hazard areas................................................................................. 7
2.6.2 Type of protection for dust hazard areas ............................................................................... 7
2.7 Ambient temperature / temperature classes.................................................................. 8
2.8 Surface temperature equipment category II 3 D ........................................................... 11
2.9
Electrical data....................................................................................................... 11
3 Installation 12
3.1 Installation...................................................................................................................... 12
4 Electrical connections 13
4.1 General notes ................................................................................................................. 13
4.2 Power supply .................................................................................................................. 14
4.3 Inputs/outputs ................................................................................................................ 14
4.4 Earthing and equipotential bonding............................................................................... 14
5 Operation 15
5.1 Start-up........................................................................................................................... 15
5.2 Operation ........................................................................................................................ 15
5.3 Electrostatic charge .......................................................................................................15
6 Service 16
6.1 Maintenance ................................................................................................................... 16
6.2 Dismantling .................................................................................................................... 16
7 Notes 17

SAFETY INSTRUCTIONS 1
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H250 M9
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1.1 General notes
These additional Instructions apply to the explosion-protected versions of the variable area
flowmeters with electrical components and the marking II 3 G and II 3 D. 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 3
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
The manufacturer declares with the EC Declaration of Conformity on his own responsibility
conformity with the protection goals of Directive 94/9/EC for use in hazardous areas with gas and
dust.
The assessment was made according to Directive 94/9/EC, Annex VIII (module "Internal control
of production"), and is registered company-internal under KMT-TDZ-A041X. This registration
number is also provided on the nameplate.
1.3 Security information
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
CAUTION!
The operator respectively his agent is responsible to follow further standards, directives or laws
if required due to operating conditions or place of installation. This applies particularly for the
use of easy detachable process connections such as SMS or Clamp when measuring flammable
mediums.

2 DEVICE DESCRIPTION
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H250 M9
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2.1 Device description
Variable area flowmeters are used to measure and display volume flows of flammable and non-
flammable gases and liquids. Depending on the device version, electrical limit switches and a 4-
20 mA signal output or a Profibus PA interface can be built into the indicator part.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
The indicator M9 standard version and M9R stainless steel version is not available for equipment
categories II 3 G and II 3 D.
1 Direction of flow
H - horizontal orientation
U - vertical downwards
no identifier - standard upwards
2 Materials / versions
RR - Stainless steel
C - PTFE or PTFE/ceramics
HC - Hastelloy
Ti - Titanium
F - Sterile version (food)
3 Heating jacket version
B - with heating jacket
4 Indicator part series
M9 - Indicator M9 standard indicator
M9S - Indicator with increased protection
M9R - Indicator in stainless steel housing
M9T - Indicator in stainless steel housing with increased protection
5 High-temperature version
HT version with HT extension
6 Electrical signal output
ESK - Electronic transmitter
7 Limit switch
K1 - One limit switch
K2 - Two limit switches
8 Explosion protection
Ex - Explosion-protected equipment

DEVICE DESCRIPTION 2
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H250 M9
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2.3 Marking
The marking of the entire device is on the display, where the following identification plate can be
found.
Additional markings on the device:
•SN - serial number
•SO - sales order / item
•KO - KROHNE order
•Vxxx - product configurator code
•AC - article code
Additional plate
The association of the housing cover to the device is confirmed by an additional plate with the
serial number on the interior of the indicator part.
1 Device type according to description code
2 Manufacturer
3 Identification number of the notified body, Pressure Equipment Directive (PED)
4 Design data: temperature & pressure rating
5 DGRL data
6 Ex data
7 Electrical connection data
8 Note manual
9 KROHNE website