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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 instructions Supplementary instructions
© KROHNE 09/2013 - 4000760402 MA DK37 M8 AD II2G R02 en
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CONTENTS
DK37/M8 - H250/M8
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............................................................................................................... 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 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.
PTB 01 ATEX 2202
PTB 01 ATEX 2202
PTB 01 ATEX 2202PTB 01 ATEX 2202
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2 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 bzw. PTFE mit Keramik-Auskleidung
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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2 DEVICE DESCRIPTION
2.3 Marking
The marking of the entire device is on the display, where the following identification plate can be
found. An additional marking is located on the inside of the display with the serial number (P/A).
DK37/M8 - H250/M8
1 Device type
2 Manufacturer
3 Notified ATEX (PED body)
4 Sizing data: temperature & pressure rating
5 PED data
6 Ex data
7 Electrical connection data
8 Note manual
9 KROHNE website
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DK37/M8 - H250/M8
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. The following values define it
= -20...+60°C / -4...+140°F and P
T
atm
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Installation conditions:
Installation conditions:
Installation conditions:Installation 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.
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
for ensuring that the flowmeter is operated safely as regards 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
avoid the electrostatic charge.
= 0.8...1.1 bar.
atm
DEVICE DESCRIPTION 2
-8
S/m, in order to
2.5 Device category
The flowmeters are designed in Category II 2G according to EN 60079-0 and EN 60079-11 for use
in Zone 1.
2.6 Types of protection
The variable area flowmeter is designed with type of protection intrinsic safety, level of
protection "ia" as per EN 60079-11.
The marking II 2G Ex ia IIC T6 Gb
II
II Explosion protection Group II
IIII
2222 Device category 2
GGGG Gas explosion protection
ia
ia Intrinsically safe, level of protection "ia"
iaia
IIC
IIC Suitable for gas groups IIC, IIB and IIA
IICIIC
T6
T6 Suitable for temperature classes T6 ...T1
T6T6
Gb
Gb EPL, suitable for zone 1 or zone 2
GbGb
II 2G Ex ia IIC T6 Gb contains the following information:
II 2G Ex ia IIC T6 GbII 2G Ex ia IIC T6 Gb
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2 DEVICE DESCRIPTION
2.7 Ambient temperature / temperature classes
Because of the influence of the temperature of the product, no fixed temperature class is
assigned to variable area flowmeters. In fact, the temperature class of a device is a function of
the temperature of both the product and the environment. A distinction is made between devices
with signal output 4...20 mA and limit switches. There is no distinction between devices with one
or two contacts. The classification is outlined in the following tables.
The tables take into account the following parameters:
• Ambient temperature T
• Product temperature T
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 installation
instructions in the installation and operating manual.
•
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.
amb.
m
DK37/M8 - H250/M8
DK37/M8./../.. permissible medium and ambient temperatures
Temperatureclass
T6 +40 +104 +60 +140 +85 +185
T5 +40 +104 +100 +212 +100 +212
T4 +40 +104 +135 +275 +135 +275
T3...T1 +40 +104 +145 +293 +200 +392
1 Temperature resistance of the cable ≥ +80°C / +176°F
2 Temperature resistance of the cable ≥ +70°C / +158°F
Ambient temperature
Maximum permissible medium temperature
up to
Type DK37/M8E/.. Type DK37/M8M/..K.
[°C] [°F] [°C] [°F] [°C] [°F]
+50 +122 - - +85 +185
+60 +140 - - +70 +158
+50 +122 +85 +185 +100 +212
+60 +140 +65 +149 +100 +212
+50 +122 +130 +266 +135 +275
+60 +140 +115 1 +239 1 +135 +275
+90 2 +194 2
+50 +122 +130 +266 +200 +392
+60 +140 +115 1 +239 1 +200 1 +392 1
+90 2 +194 2 +140 2 +284 2
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DK37/M8 - H250/M8
H250/../M8.G/.. permissible product and ambient temperatures
DEVICE DESCRIPTION 2
Temperatureclass
Ambient temperature
up to
Maximum permissible medium temperature
Type H250/../M8EG/.. Type H250/../M8MG/../..
[°C] [°F] [°C] [°F] [°C] [°F]
T6 +40 +104 +75 +167 +85 +185
+50 +122 - - +85 +185
+60 +140 - - +85 +185
T5 +40 +104 +100 +212 +100 +212
+50 +122 +100 +212 +100 +212
+60 +140 +70 +158 +100 +212
T4 +40 +104 +135 +275 +135 +275
+50 +122 +135 +275 +135 +275
+60 +140 +135 1 +275 1 +135 +275
+90 2 +194 2
T3...T1 +40 +104 +200 1 +392 1 +200 +392
+190 2 +374 2
+50 +122 +185 1 +365 1 +200 +392
+145 2 +293 2
+60 +140 +145 1 +293 1 +200 +392
+90 2 +194 2
1 Temperature resistance of the cable ≥ +80°C / +176°F
2 Temperature resistance of the cable ≥ +70°C / +158°F
The minimal permissible ambient temperature depends on the display and the built in limit
switches:
Type Electrical built in Minimum ambient temperature
H250/../M8EG
DK37/M8E/../..
H250/../M8MG
DK37/M8M/../..
H250/../M8MG
DK37/M8M/../..
Signal output 4...20 mA -40°C / -40°F
SJ2-S1N
SC2-N0
I7S2002-N
SJ2-SN
-25°C / -13°F
-40°C / -40°F
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2 DEVICE DESCRIPTION
2.8 Electrical data
The electronic signal output may only be connected to intrinsically safe circuits. Depending on
the instrument design, the following maximum values apply per circuit:
Version DK37/M8E/.. and H250/../M8EG
DK37/M8 - H250/M8
U
i
I
i
P
i
30 VDC
100 mA
1000 mW
Irrespective of the instrument design the following values are to be observed for each
intrinsically safe circuit in case of interconnection:
C
i
Li ≈ 0
≈ 0
Version DK37/M8M/../K. and H250/../M8MG/K.
U
i
I
i
P
i
Depending on the built in limit switches the following values are to be observed for each
intrinsically safe circuit in case of interconnection:
16 VDC
25 mA
64 mW
Type of limit switch I7S2002-N
C
i
Li 150 µH 100 µH
The values specified for C
SC2-N0
165 nF 45 nF
and Li also take into account the capacities and inductances of the
i
SJ2-SN
SJ2-S1N
internal EMC filter.
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DK37/M8 - H250/M8
3.1 Installation
Installation and setup must be carried out according to the applicable installation installation
standards (e.g. EN 60079-14) by qualified personnel trained in explosion protection. The
information given in the Installation and Operation Instructions and the Supplementary
Installation and Operation Instructions must always be observed.
Variable area flowmeters must be installed in such a way that
• There is no danger from mechanical impact effects.
• There are no external forces affecting the indicator part.
• The device is accessible for any visual inspections that are necessary, and can be viewed from
all sides.
• The nameplate is clearly visible.
• It can be operated from a location with secure footing.
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use other than the
intended purpose. This applies in particular to hazards due to insufficient corrosion resistance
and suitability of the materials in contact with product.
INSTALLATION 3
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4 ELECTRICAL CONNECTIONS
4.1 General notes
The limit switch or electronic signal output with protection level "ia" or "ib" is electrically
connected in the terminal compartment of the display housing. Permissible maximum values
(electrical data) must be observed. Observe the specified polarities.
Connecting cable
The connecting cables must be selected according to prevailing installation standards (e.g.
EN 60079-14).. The outer diameter of the connecting cable must be within the sealing range of
the cable entry. The connecting cables must be fixed and laid so they are sufficiently protected
against damage.
All cores that are not used must be securely connected to the earth potential of the hazardous
area or carefully insulated against each other and against earth (test voltage ≥ 500 V
Connection diagrams
Indicator M8M - M8MG
DK37/M8 - H250/M8
).
eff
1 Terminal Kmin
2 Terminal Kmax
Indicator M8E - M8EG
1 Terminal signal output 4...20 mA
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DK37/M8 - H250/M8
Cable entries / Blanking plugs
The variable area flowmeter is equipped as standard with a blanking plug and a cable entry.
These elements guarantee protection from foreign bodies and water (protection type) IP65 as
per EN 60529.
The cable entries provided also ensure protection from foreign bodies and water. The nominal
diameter range of the cable entries is 3...7 mm.
Suitable blanking plugs and seals are to be used for unused cable entries. Ensure that the seals
are tight.
4.2 Earthing and equipotential bonding
If the device is not sufficiently electrostatically grounded via the process cables, an additional
earth connection must be established using the earth screw 1. The position of the ground
terminal is illustrated below. The connection guarantees only an electrostatic connection of the
device and does not comply with the requirements of an equipotential bonding connection.
ELECTRICAL CONNECTIONS 4
For the H250/../M8.G/.. designs also ensure proper fit of the mounting screws 2.
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5 OPERATION
5.1 Start-up
Start-up is only permitted when the variable area flowmeter:
• is correctly installed in the system and connected.
• has been checked for the proper state with regard to its installation and connection
requirements.
The user of the system must have it checked before start-up in compliance with the national
regulations for checks before startup.
5.2 Operation
Setting of the limit switches may be carried out during operation. Remove the housing cover to
this purpose. The housing cover has to be closed immediately after the limit switches have been
set.
DK37/M8 - H250/M8
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DK37/M8 - H250/M8
6.1 Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorised representative or under the supervision
of authorised inspectors.
For systems in hazardous areas, regular tests are required in order to maintain the proper
condition.
The following checks are recommended:
• Inspection of the housing, the cable entries and the feed lines for corrosion and damage.
• Checking the piping connections and the measuring unit as well as the needle valve, if
necessary, for leaks.
• Include the flowmeter in the regular pressure testing of the process line.
The cover is to be closed following maintenance work on the signal converter.
SERVICE 6
6.2 Dismantling
Replacing the display part
Replacing the display part
Replacing the display partReplacing the display part
Due to the modular design of the variable area flowmeter, it is possible to replace a complete
display with an identical spare part in accordance with safety guidelines.
CAUTION!
There may be a loss of measuring accuracy!
Exchanging the entire device
Exchanging the entire device
Exchanging the entire deviceExchanging the entire device
Removal and installation are the responsibility of the operator.
Any replacement and removal should take place in a de-energized state if possible. If that is not
possible, the basic conditions for intrinsic safety (e.g. no grounding or connection of different
intrinsically safe circuits to one another) must be observed during dismantling.
CAUTION!
•
Pressurized pipes to be depressurized before removing the flowmeter.
•
In the case of environmentally critical or hazardous products, appropriate safety precautions
must be taken with regard to residual liquids in the measuring unit.
•
New seals must be used when re-installing the device in the piping.
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KROHNE product overview
• Electromagnetic flowmeters
• Variable area flowmeters
• Ultrasonic flowmeters
• Mass flowmeters
• Vortex flowmeters
• Flow controllers
• Level meters
• Temperature meters
• Pressure meters
• Analysis products
• Products and systems for the oil & gas industry
• Measuring systems for the marine industry
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.:+49 (0)203 301 0
Fax:+49 (0)203 301 10389
info@krohne.de
© KROHNE 09/2013 - 4000760402 MA DK37 M8 AD II2G R02 en - Subject to change without notice.
The current list of all KROHNE contacts and addresses can be found at:
www.krohne.com
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