KROHNE H250 M10 Wiring diagram

Variable area flowmeter
Equipment category II 2G
Equipment category II 2GEquipment category II 2G
Equipment category II 2G
H250 M10
H250 M10H250 M10
H250 M10 Supplementary instructions
Supplementary instructionsSupplementary instructions
Supplementary instructions
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CONTENTS
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H250 M10
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............................................................................................................... 4
2.3 Marking............................................................................................................................. 5
2.4 Flammable products ........................................................................................................ 6
2.5 Equipment category .........................................................................................................6
2.6 Protection types................................................................................................................ 7
2.7 Ambient temperature / temperature classes.................................................................. 7
2.8 Electrical data................................................................................................................... 8
3 Installation 9
3.1 Installation........................................................................................................................ 9
3.2 Special conditions............................................................................................................. 9
4 Electrical connections 10
4.1 General notes ................................................................................................................. 10
4.2 Power supply .................................................................................................................. 10
4.3 Inputs / outputs .............................................................................................................. 11
4.4 Earthing and equipotential bonding............................................................................... 12
5 Operation 13
5.1 Start-up........................................................................................................................... 13
5.2 Operation ........................................................................................................................ 13
6 Service 14
6.1 Maintenance ................................................................................................................... 14
6.2 Dismantling .................................................................................................................... 14
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SAFETY INSTRUCTIONS 1
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Safety instructions
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 complement the standard documentation
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 standard documentation 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.
The EC Type Test Certificate of the Physikalisch Technische Bundesanstalt (PTB)
forms the basis of the EC Declaration of Conformity:
The EC type test certificate may be downloaded from the manufacturer's website as needed.
1.3 Safety instructions
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
PTB 01 ATEX 1154
PTB 01 ATEX 1154PTB 01 ATEX 1154
PTB 01 ATEX 1154
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
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2DEVICE DESCRIPTION
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Device description
2.1 Device description
Variable area flowmeters measure and display the volume flow of flammable and non-
flammable gases and liquids. The display unit contains a 4...20 mA signal output with optional
HART®communication, two programmable electronic switch outputs and a reset input.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
1 Materials / versions
RR - Stainless Steel
C - PTFE or PTFE/ceramics
HC - Hastelloy
Ti - Titanium
F - aseptic version (food)
2 Series of indicators
M10 - Converter M10
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DEVICE DESCRIPTION 2
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2.3 Marking
Type designation of the complete unit is shown on the indicator with the nameplates reproduced
below (see also description code).
Additional markings on the housing cover:
•SN - serial number
•SO - sales order / item
•P/A - order
•Vxxx - product configurator code
•AC - article code
1 Device type
2 Manufacturer
3 ATEX & DGRL certification agency code.
4 Year of manufacture
5 Production order No.
6 Ex data
7 Electrical connection data
8 Observe operating instructions
9 Manufacturer's website
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2DEVICE DESCRIPTION
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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. The following values define it
Tatm = -20...+60°C / -4...+140°F and Patm = 0.8...1.1 bar.
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Installation condititions:
Installation condititions:Installation condititions:
Installation condititions:
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 Equipment category
Variable area flowmeters are designed according to EN 60079-0:2009 and EN 60079-1:2007 in
Category II 2 G for use in zone 1. The parts inside the measuring unit are also approved for use in
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
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
-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 may occasionally occur as a result of the mixture of
flammable substances in the form of gas, steam or mist with air under normal operation.
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DEVICE DESCRIPTION 2
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2.6 Protection types
The variable area flowmeter is designed with protection type flameproof enclosure "d", acc. to
EN 60079-1.
The marking is: II 2G Ex d IIC T6
II 2G Ex d IIC T6II 2G Ex d IIC T6
II 2G Ex d IIC T6
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. Please see the following tables for the
assignments.
The tables take into account the following parameters:
•Maximum values Pv
•Ambient temperature Tamb.
•Product temperature Tm
•Heat resistance of the connecting cable
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.
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 d
Ex dEx d
Ex d Electronics compartment - protection type flameproof enclosure "d"
IIC
IICIIC
IIC Suitable for gas groups IIC, IIB and IIA
T6
T6T6
T6 Suitable for temperature classes T6 ... T1
Gb
GbGb
Gb EPL, suitable for zone 1
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 standard documentation.
• 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.
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2DEVICE DESCRIPTION
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Maximum permissible product and ambient temperatures per temperature class
The cable glands and line entries must have the same degree of thermal stability as the
connecting cable.
The minimum product temperature is -40°C / -40°F.
2.8 Electrical data
Temperature
class
Ambient
temperature
Product temperature at permanent service temperature
of connecting cable
70°C / 158°F80°C / 176°F90°C / 194°F
[°C] [°F] [°C] [°F] [°C] [°F] [°C] [°F]
T6 -40...+60 -40...+140 85 185 85 185 85 185
T5 -40...+50 -40...+122 100 212 100 212 100 212
-40...+60 -40...+140 85 185 100 212 100 212
T4 -40...+50 -40...+122 135 275 135 275 135 275
-40...+60 -40...+140 85 185 135 275 135 275
T3...T1 -40...+40 -40...+104 180 356 200 392 200 392
-40...+50 -40...+122 135 275 190 374 200 392
-40...+60 -40...+140 85 185 145 293 200 392
Electrical equipment Rated voltage Nominal current
Signal output M10 24 VDC ±30% 4...20 mA
with HART®communication
Binary outputs B1 and B2 8...30 VDC max. 100 mA
Reset input 5...30 VDC ≤1 mA
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INSTALLATION 3
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Installation
3.1 Installation
Installation and setup must be carried out according to the applicable installation standards (e.g.
EN 60079-14) by qualified personnel trained in explosion protection. The information given in the
manuals and the supplementary instructions must be observed at all times.
Variable area flowmeters must be installed in such a way that
•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.
3.2 Special conditions
Equipotential bonding
Variable area flowmeters must be included in the equipotential bonding of the hazardous area.
Electronics compartment lock
The variable area flowmeter's flameproof electronics compartment must be locked during
operation. The cover of the electronics compartment is secured by a lock. An SW3 Allen screw is
used for the safety screw. With temperature classes T6 and T5, a waiting time of 8 minutes must
be observed prior to opening. For temperature classes T4...T1 the waiting time is not needed.
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.
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4ELECTRICAL CONNECTIONS
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Electrical connections
4.1 General notes
Rated values for insulation
•The insulation of the H.../..../M10 - Ex variable area flowmeters is rated in compliance with
IEC 60 664-1. The following rating parameters are taken into account:
•Overvoltage category for signal and instrument loops: II
•Pollution degree of the insulation: 2
Terminal compartment
The electrical connections for the power supply and I/O functions are located in the signal
converter's electronics compartment. The protection type of the electronics compartment is "d".
Unused openings shall be closed in compliance with EN 60079-1. The cables can be routed into
the flameproof electronics compartment in two different ways.
•Direct entry of the connecting cables by way of approved flameproof cable glands (M20x1.5)
into the flameproof terminal compartment (V ≤2000cm³). The cable glands require a
separate test certificate in accordance with EN 60079-1. Observe the requirements of the test
certificate for the cable glands.
•Direct entry of the connecting cables by way of conduits into the flameproof enclosed
terminal compartment of the device. Once the conduit has been screwed in, it must form a
flameproof joint with the housing with a minimum thread length of 8 mm. A suitable
mechanical stopping box must be provided in accordance with installation provisions. The
conduit must be installed in compliance with its separate test certificate.
Connecting cables
Connecting cables shall comply with relevant installation standards (e.g., EN 60079-14 / VDE
0165). The outer diameter of the connecting wires shall conform to the cable clamping area for
the supplied cable entries.
The wiring for the variable area flowmeter's electrical connection shall be fixed.
4.2 Power supply
The variable area flowmeter does not require a separate power supply. The required supply for
the built-in electronics is provided via the 4...20mA current output.
CAUTION!
The IP protection category of the signal converter housing is largely determined by the cable
gland used and the installation.
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ELECTRICAL CONNECTIONS 4
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4.3 Inputs / outputs
The signal circuits of the variable area flowmeter may only be connected to downstream devices
or circuits that satisfy the requirements of protective extra-low voltage (PELV).
Connecting power and I/O functions
•Before connecting or disconnecting the electrical connection cables of the device, make sure
that all cables leading to the converter are isolated from the ground of the hazardous area.
This also applies to protective ground (PE) and equipotential bonding conductors (PA).
•All connecting cable conductors and shields that are not securely connected to the
equipotential grounding system of the hazardous area shall be carefully isolated from one
another and from ground (1500Vrms test voltage for non-intrinsically safe cables)
•Connect all shields by the shortest route possible to the press fitted U-clamp (PE) terminal
located in the terminal compartment. If shields are to be grounded at both ends (e.g., for EMC
reasons), adequate equipotential bonding is required between the two shields to avoid
unacceptable equalizing currents.
•The converter shall be incorporated into the equipotential bonding system of the hazardous
area. Connect the conductor to the press-fitted U-clamp mounted on the outside of the
converter housing.
•The measuring tube can be incorporated into the equipotential bonding system of the
hazardous area using the U-clamp mounted on the flange if present, or suitable conductive
connections (seals, etc.).
Terminal assignment
Function - signal output Terminal designation
Current output HART®(current loop) I+ I-
Status output (1)
(Binary output 1) NAMUR B+ BN
O/C-PNP B+ BOC
Status output (2)
(Binary output 2) NAMUR B+ BN
O/C-PNP B+ BOC
Status input (reset counter) R+ R-
Figure 4-1: Indicator M10 terminal connection
1 Power supply - analog output
2 Switching output B1
3 Switching output B2 or pulse output
4 Reset input R
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4ELECTRICAL CONNECTIONS
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4.4 Earthing and equipotential bonding
The signal converter shall be connected to the equipotential bonding system of the hazardous
area via the external grounding connection on the signal converter housing. The measuring unit
and the signal converter are electrically connected via an equipotential bonding conductor.
Any existing cable shields should be connected to earth according to applicable installation
regulations (EN 60079-14). A terminal connection in the terminal compartment permits a short
way earthing of the cable shields.
1 External grounding connection
2 Internal grounding connection
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OPERATION 5
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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.
•and the electronics compartment have been properly closed (pressure-resistant casing) and
the applicable special lock has been fitted.
The user of the system must have it checked before start-up in compliance with the national
regulations for checks before startup.
If the device needs to be configured due to the existence of an explosive atmosphere, this can be
done using the supplied programming magnets. There is no need to open the housing as it can
be done through the glass window of the electronics compartment or digitally via the signal
output (HART®interface).
5.2 Operation
Variable area flowmeters must be operated in such a way that they remain within the maximum
and minimum permissible temperatures and pressures and the electrical limit values.
Variable area flowmeters may only be operated if the equipment parts necessary for safety are
effective in the long run, and are not rendered inoperable during operation.
When it comes to flammable products, the measuring sections must be included in the periodic
pressure tests of the system.
Opening the housing of the electronics compartment (protection type flameproof enclosure) in
hazardous areas is only permitted in a de-energised state and after complying with the waiting
time. The waiting time (8 minute) only applies to temperature classes T6 and T5.
CAUTION!
Ignition risks caused by pressure surges, impact or friction must particularly be avoided when
titanium measuring units are used.
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6SERVICE
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Service
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.
To maintain proper condition, regular inspections are required for systems in hazardous areas.
The following checks are recommended:
•Checking the housing, the cable entries and the feed lines for corrosion and/or damage.
•Checking the measuring unit and the piping connections for leakage.
•Checking the measuring unit and the indicator for dust deposits.
•Including the flowmeter in the regular pressure test of the process line.
6.2 Dismantling
General notes
If it is absolutely necessary to open the flameproof enclosure of the electronics compartment in
the presence of a potentially explosive atmosphere, the device must be de-energised. For
temperature classes T6 and T5, be absolutely sure to wait until the time shown on the converter
nameplate has elapsed before opening the flameproof enclosure (8 minutes). The waiting period
is not necessary for any of the other temperature classes.
Before connecting or disconnecting the electrical connection cables of the device, make sure
that all cables leading to the converter are isolated from the ground of the hazardous area. This
also applies to protective earth (PE) or functional earth (FE) and equipotential bonding
conductors (PA).
After opening the converter, grease the converter's flashback resistant cover threads including
the cover seals if necessary. Use the multi-purpose grease NONTRIBOS®, type Li EP2.
Replacing the signal converter / display
The device should be de-energised before opening the flameproof enclosure.
The display can be exchanged once the flameproof enclosure of the electronics compartment
has been opened. When exchanging a complete display, refer to the section "Connecting power
and I/O functions". In both cases, the measuring tube of the variable area flowmeter can remain
in the pipeline, even when the product is flowing.
CAUTION!
Avoid electrostatic charges when cleaning the surfaces (e.g. sight window).
CAUTION!
Only displays that are identical in construction and complete signal converter housings may be
swapped. Individual device inserts may not be exchanged! When exchanging signal converters,
compare the type plates. Only signal converters that are identical in construction may be
exchanged
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SERVICE 6
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Exchanging the entire device
Observe the information above. Also, ensure that all process connections and the pipeline are
depressurized and free of product. Where environmentally critical products are concerned,
carefully decontaminate the wetted parts of the flange system after dismantling.
CAUTION!
Faulty prisms between the measuring tube and the display housing should be replaced.
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KROHNE product overview
•Electromagnetic flowmeters
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•Flow controllers
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•Products and systems for the oil & gas industry
•Measuring systems for the marine industry
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