KROHNE H250 M40 Series Wiring diagram

Equipment category II 2G and II 2D, EPL Gb and Db
in protection type intrinsic safety "i"
H250 M40
H250 M40H250 M40
H250 M40 Supplementary instructions
Supplementary instructionsSupplementary instructions
Supplementary instructions
© KROHNE 02/2015 - 4001481102 - MA H250/M40-Exi--II2GD-AD R02 en

CONTENTS
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H250 M40
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 Approval according to the IECEx scheme ........................................................................ 3
1.4 Security information......................................................................................................... 4
2 Device description 5
2.1 Device description ............................................................................................................ 5
2.2 Description code............................................................................................................... 5
2.3 Marking............................................................................................................................. 6
2.4 Flammable products ........................................................................................................ 7
2.5 Device category ................................................................................................................ 7
2.6 Protection types................................................................................................................ 8
2.7 Ambient temperature / temperature classes.................................................................. 9
2.8 Surface temperature for equipment category II 2D ...................................................... 15
2.9 Electrical data................................................................................................................. 16
3 Installation 17
3.1 Installation...................................................................................................................... 17
4 Electrical connections 18
4.1 General notes ................................................................................................................. 18
4.2 Power supply .................................................................................................................. 18
4.3 Inputs/outputs ................................................................................................................ 18
4.4 Grounding and equipotential bonding............................................................................ 18
5 Operation 19
5.1 Start-up........................................................................................................................... 19
5.2 Operation ........................................................................................................................ 19
5.3 Electrostatic charge .......................................................................................................19
6 Service 20
6.1 Maintenance ................................................................................................................... 20
6.2 Dismantling .................................................................................................................... 20
7 Notes 21

SAFETY INSTRUCTIONS 1
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1.1 General notes
These additional instructions apply to explosion-protected versions of variable area flowmeters
with electrical built-ins with protection type intrinsic safety "i", equipment category II 2 G and II 2
D, EPL Gb and Db. It completes the installation and operating instructions for the non-explosion
protected versions.
The information given in this instruction contains only the data relevant to explosion protection.
The technical details given in the manual 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, in which the applied standard
is also specified, on his own responsibility conformity with the protection goals of directive
94/9/EC for use in hazardous areas with gas and dust.
The EC declaration of conformity for the equipment category II 2 G and II 2 D is based on the EC
type examination certificate of the Physikalisch Technische Bundesanstalt (PTB):
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 EC type examination certificate can be downloaded from the manufacturer's
website.
1.3 Approval according to the IECEx scheme
Conformity of the variable area flowmeter for use in hazardous areas with gas was tested in
accordance with the IECEx Certification Scheme for Explosive Atmospheres acc. to IEC 60079-0:
2007 and IEC 60079-11: 2006. 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.
PTB 11 ATEX 2012 X
PTB 11 ATEX 2012 XPTB 11 ATEX 2012 X
PTB 11 ATEX 2012 X
IECEx PTB 11.0069 X
IECEx PTB 11.0069 XIECEx PTB 11.0069 X
IECEx PTB 11.0069 X

1 SAFETY INSTRUCTIONS
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1.4 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.

DEVICE DESCRIPTION 2
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2.1 Device description
Variable area flowmeters measure and display the volume flow of flammable and non-
flammable gases and liquids. Depending on the device version, electrical limit switch contacts, a
4...20 mA signal output with
HART
®
communication, a Foundation Fieldbus interface or a Profibus PA interface can be
installed in the indication unit.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
1 Type series 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
F - Food
3 Heating jacket version
blanc - without heating jacket
B - with heating jacket
4 Signal converter version
M40 - Aluminium housing, painted (standard)
M40S - Aluminium housing with increased corrosion protection
M40R - Stainless steel housing
5 High temperature version
blanc - without HT extension
HT - with HT extension
6 Electrical signal output
blanc - without transmitter
ESK - Electrical signal output 4...20mA (ESK4)
. . . - optionally available with counter, I/O module and display (ESK4-T) or
. . . - Foundation Fieldbus (ESK4-FF) or
. . . - Profibus PA (ESK4-PA)
7 Limit switches
blanc - without limit switches
K1 - One limit switch
K2 - Two limit switches
R1 - 1 reed switch
R2 - 2 reed switches
8 Version
Ex - Explosion-protected version
9 SIL Version
SE - SIL compliant electronic signal output
SK - SIL compliant limit switch

2 DEVICE DESCRIPTION
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2.3 Marking
The marking of the entire device is clearly visible on the indication unit, in accordance with the
designation code.
Additional markings on the housing cover:
•SN - serial number
•SO - sales order / item
•PA - 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.
Figure 2-1: Examples of identification plates
1 Meter Type
2 Manufacturer
3 Identification number of the notified body ATEX & PED
4 Rating data: temperature & pressure rating
5 PED data
6 Ex data
7 Electrical connection data
8 Note to observe the documentation
9 Manufacturer's website

DEVICE DESCRIPTION 2
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2.4 Flammable products
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
Atmospheric conditions:
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions. It is defined by the following values T
atm
= -20...+60°C /
-4...+140°F and P
atm
= 0.8...1.1 bar. Outside of this range, for most mixtures no key figures are
available for the ignition behaviour.
Operating conditions:
Operating conditions:Operating conditions:
Operating conditions:
Variable area flowmeters operate outside of atmospheric conditions, which means that
explosion protection according to directive 94/9/EC (ATEX) –regardless of the zone assignment
–is fundamentally not applicable due to the lack of key safety data for the interior of the
measuring section.
2.5 Device category
Variable area flowmeters are designed in accordance with EN 60079-0 and EN 60079-11 in
category II 2 G and EPL Gb for use in zone 1.
Depending on the device version, variable area flowmeters are also designed in
category II 2 D and EPL Db for use in zone 21.
The inside of the measuring unit is also permitted for zone 1.
WARNING!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. The operator is responsible
to ensure that the flowmeter is operated safely in terms of the temperature and pressure of the
products used. In case of operation with flammable products the measuring units must be
included in the periodic pressure tests of the system. When using the device version H250/C...
(PTFE-liner, nonconductive) the min. conductivity of the medium must be 10
-8
S/m, in order to
avoid the electrostatic charge.
INFORMATION!
Definition of zone 1 acc. to EN 1127-1, Appendix B:
An area in which an explosive atmosphere, as a result of the mixture of flammable substances in
the form of gas, steam or mist with air, under normal operation may occasionally occur.
Definition of zone 21 acc. to EN 1127-1, Appendix B:
An area in which an explosive atmosphere may occasionally occur in the form of a cloud of
flammable dust in the air under normal operation.

2 DEVICE DESCRIPTION
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2.6 Protection types
The variable area flowmeter is designed with protection type intrinsic safety "i" acc. to EN 60079-
11.
The identification for equipment category II 2 G and EPL Gb is:
II 2G Ex ia IIC T6...T2 Gb or II 2G Ex ia IIB T6...T2 Gb
II 2G Ex ia IIC T6...T2 Gb or II 2G Ex ia IIB T6...T2 GbII 2G Ex ia IIC T6...T2 Gb or II 2G Ex ia IIB T6...T2 Gb
II 2G Ex ia IIC T6...T2 Gb or II 2G Ex ia IIB T6...T2 Gb
The additional identification of the version for the equipment category II 2 D and EPL Db is:
II 2D Ex ia IIIC T85
II 2D Ex ia IIIC T85II 2D Ex ia IIIC T85
II 2D Ex ia IIIC T85°C Db
C DbC Db
C Db
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
The marking contains the following information:
II
IIII
II Explosion protection, group II
2
22
2Equipment category 2
G
GG
GGas explosion protection
Ex ia
Ex iaEx ia
Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIC
IICIIC
IIC Gas group, suitable for gas groups IIC, IIB and IIA
IIB
IIBIIB
IIB Gas group, suitable for gas groups IIB and IIA
T6...T2
T6...T2T6...T2
T6...T2 Temperature class range, suitable for temperature classes T6 ... T1
Gb
GbGb
Gb EPL, suitable for zone 1
INFORMATION!
For the equipment category II 2 G and EPL Gb, connection to an intrinsically safe circuit with
protection level "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with protection level
"ia", a higher protection level is given.
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
The marking contains the following information:
II
IIII
II Explosion protection, group II
2
22
2Equipment category 2
D
DD
DDust explosion protection
Ex ia
Ex iaEx ia
Ex ia Explosion protection through intrinsic safety, protection level "ia"
IIIC
IIICIIIC
IIIC Dust group, suitable for groups IIIC, IIIB and IIIA
T85
T85T85
T85°C
CC
CMaximum surface temperature at 65°C ambient temperature
Db
DbDb
Db EPL, suitable for zone 21
INFORMATION!
For the equipment category II 2 D and EPL Db, connection to an intrinsically safe circuit with
protection level "ib" is required.
When connecting the variable area flowmeter to an intrinsically safe circuit with protection level
"ia", a higher protection level is given.

DEVICE DESCRIPTION 2
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2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, variable area flowmeters with built-in electrical
equipment (electric variants) are not assigned to any fixed temperature class. The temperature
class of these devices is rather a function of the product temperature and ambient temperature
that is present and the specific device version. The classification is outlined in the following
tables.
The tables take into account the following parameters:
•installed equipment
•Maximum values I
i
and P
i
for K1, K2
•Ambient temperature T
amb
•Product temperature T
m
•Nominal DN
•Standard or high temperature version (HT)
•Standard or heating jacket version
•Heat resistance of the connecting cable
When using more than one installed equipment, the data of the most unfavourable equipment
should be used.
For certain device version, lower values apply due to differing boundary conditions (e.g. lining
materials). Here the user should consult the technical data sheet.
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
• The measuring device is installed and operated in accordance with the manufacturer's
installation instructions.
• It must be ensured that the flowmeter is not heated by the effects of additional heat radiation
(sunshine, neighbouring system components) and thus operated above the permissible
ambient temperature range.
• Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.
For this purpose, the variant with a projecting indicator (HT version) is preferable.
• For device versions with a heating jacket the temperature of the heating medium does not
exceed the maximum permissible product temperature.

2 DEVICE DESCRIPTION
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Using a heat resistant connecting cable
1Maximum value of the product temperature for the use of a standard connecting cable. For
higher product temperatures a connecting cable with a temperature resistance of 90°C / 194°F is
required.
HT version - high-temperature version with projecting indicator
The permitted ambient temperature range is indicated on the nameplate; depending on the
device version it is Tamb = -40...+65°C / -40...+149°F or Tamb = -25...+65°C / -13...+149°F.
The minimum product temperature is -40°C / -40°F.
Temperature table in °C
Heating jacket T
m
1
without with HT-version T
amb
≤40 T
amb
≤60 T
amb
≤65
DN15, DN25, DN50 DN15, DN25 220 105 75
x - 175 95
DN80, DN100 DN50, DN80 165 90 75
x - 155 90
Temperature table in °F
Heating jacket T
m
1
without with HT-version T
amb
≤104 T
amb
≤140 T
amb
≤149
DN15, DN25, DN50 DN15, DN25 428 221 167
x - 347 203
DN80, DN100 DN50, DN80 329 194 167
x - 311 194