Siemens SITRANS FX300 Wiring diagram

Answers for industry.
05/2015Edition
Supplementary instructions
SITRANS F
Vortex flowmeters
SITRANS FX300

CONTENTS
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SITRANS FX300
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 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 Types of protection ........................................................................................................... 7
2.7 Ambient temperature / temperature classes.................................................................. 7
2.8 Electrical data................................................................................................................. 10
3 Installation 11
3.1 Installation...................................................................................................................... 11
3.2 Special Conditions .......................................................................................................... 12
4 Electrical connections 13
4.1 General notes ................................................................................................................. 13
4.2 Power supply .................................................................................................................. 13
4.3 Inputs / outputs .............................................................................................................. 13
4.4 Earthing and equipotential bonding............................................................................... 14
4.5 Sensor circuits (remote version only)............................................................................ 15
5 Operation 16
5.1 Start-up........................................................................................................................... 16
5.2 Operation ........................................................................................................................ 16
6 Service 17
6.1 Maintenance ................................................................................................................... 17
6.2 Dismantling .................................................................................................................... 17
7 Notes 19

SAFETY INSTRUCTIONS 1
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1.1 General notes
These additional "Ex" instructions apply to explosion-protected versions of vortex flowmeters
with 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 Examination Certificate of the Physikalisch Technische Bundesanstalt (PTB) forms
the basis of the EC Declaration of Conformity:
The "X" after the certificate number refers to special conditions for safe use of the device, which
have been listed in these Instructions.
The EC Type Examination Certificate may be downloaded from the manufacturer's website as
needed.
1.3 Approval according to the IECEx scheme
Conformity with IECEx standards was tested in accordance with the IECEx Certification Scheme
for Explosive Atmospheres acc. to IEC 60079-0 and IEC 60079-11. The number of the IEC
certificate is:
1.4 Safety instructions
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
PTB 08 ATEX 2022 X
PTB 08 ATEX 2022 XPTB 08 ATEX 2022 X
PTB 08 ATEX 2022 X
IECEx PTB 12.0019X
IECEx PTB 12.0019XIECEx PTB 12.0019X
IECEx PTB 12.0019X
CAUTION!
Should operating conditions and locations require the observance of further standards,
guidelines and laws, this is the responsibility of the operator and/or those commissioned by him.

2 DEVICE DESCRIPTION
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2.1 Device description
Vortex 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 and a separate pulse/status output.
2.2 Description code
The safety description code * consists of the following elements:
* positions which are not needed are omitted (no blank positions)
The remote version consisting of the SITRANS FX300 S measuring sensor and the SITRANS
FX300 C signal converter is called the SITRANS FX300 R.
1 SITRANS vortex flowmeter
2 Type series FX300
3 System components
not connected: compact device
C: Converter remote system
S: Sensor remote system
4 Marking without influence on the explosion safety protection

DEVICE DESCRIPTION 2
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2.3 Marking
The marking key is used to mark the devices using the nameplates as illustrated here. On both
the compact devices and the remote versions, the main plate is located on the converter
housing. On the remote versions there is an additional marking on the sensor.
Compact devices with two converters for dual measurement (Dual Version) are each marked
with a nameplate, which is affixed to each of the converter housings. The details relevant to
explosion protection are identical on both nameplates.
1 Device version
2 Materials sensor and sealing
3 Serial number
4 Year of manufacture
5 Marking as per PTB 08 ATEX 2022X or IECEx PTB 12.0019X
6 Permissible ambient temperature range
7 Maximum values intrinsically safe circuits
8 Safety instructions
9 Observe operating instructions

2 DEVICE DESCRIPTION
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2.4 Flammable products
Atmospheric conditions
An explosive atmosphere is defined as a mixture of air and flammable gases, vapours, mists or
dusts under atmospheric conditions with the values
T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar.
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Operating conditions
Vortex 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
unit.
2.5 Equipment category
Vortex flowmeters are designed according to EN 60079-0, EN 60079-1 and EN 60079-11 in
category II 2 G for use in zone 1. The inside of the measuring unit is also approved for zone 1.
For more information see the chapter entitled "Flammable products".
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.
INFORMATION!
Definition of zone 1 as per EN 1127-1, Annex 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.

DEVICE DESCRIPTION 2
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2.6 Types of protection
The following types of protection are used:
•Electronics compartment - type of protection flameproof enclosure "d"
•Terminal compartment - type of protection intrinsic safety "i"
•Input/output circuits in type of protection intrinsic safety, level of protection "ia" operation on
intrinsically safe circuits level of protection "ib" permitted.
•Sensor circuits remote version (compact device only internally) in type of protection intrinsic
safety, level of protection "ia"
2.7 Ambient temperature / temperature classes
The permissible range of ambient temperatures for vortex flowmeters is noted on the nameplate
and is
T
amb
= -40°C...+60°C / -40°F...+140°F and
T
amb
= -25°C...+60°C / -13°F...+140°F (until year of manufacture 2008).
Because of the influence of the temperature of the product, no fixed temperature class is
assigned to vortex flowmeters. In fact, the temperature class of a device is a function of the
temperature of both the product and the environment, as well as the size of the measuring units.
The classification for the respective version is outlined in the following tables.
Regardless of the temperature class, the lower limit value for the product temperature is T
M
= -
40°C / -40°F for all versions.
The marking on the compact device as per ATEX is: II 2G Ex d ia [ia] IIC T6...T1 Gb
II 2G Ex d ia [ia] IIC T6...T1 GbII 2G Ex d ia [ia] IIC T6...T1 Gb
II 2G Ex d ia [ia] IIC T6...T1 Gb
The marking on the remote converter as per ATEX is II 2G Ex d ia [ia] IIC T6 Gb
II 2G Ex d ia [ia] IIC T6 GbII 2G Ex d ia [ia] IIC T6 Gb
II 2G Ex d ia [ia] IIC T6 Gb
The marking on the remote sensor as per ATEX is: II 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 GbII 2G Ex ia IIC T6...T1 Gb
II 2G Ex ia IIC T6...T1 Gb
The marking on the compact device as per IECEx is: Ex d ia [ia] IIC T6 Gb
Ex d ia [ia] IIC T6 GbEx d ia [ia] IIC T6 Gb
Ex d ia [ia] IIC T6 Gb
The marking on the remote converter as per IECEx is: Ex d ia [ia] IIC T6 Gb
Ex d ia [ia] IIC T6 GbEx d ia [ia] IIC T6 Gb
Ex d ia [ia] IIC T6 Gb
The marking on the remote sensor as per IECEx is: Ex ia IIC T6 Gb
Ex ia IIC T6 GbEx ia IIC T6 Gb
Ex ia IIC T6 Gb
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.

2 DEVICE DESCRIPTION
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Permissible product and ambient temperatures with converter or connection box sensor
installed above the measuring section
As shown in the figure below, the measuring device should be installed so that it is protected
from direct sunlight.
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures per temperature class in °F
Temperature class T6 T5 T4 T3 T2 …T1
T
amb
in °C60 60 50 60 40 50 60 40 50 60
Nominal size
DN15 …25 60 75 110 110 175 175 1 125 1 235 1 180 1 125 1
DN40 …50 60 75 110 110 175 165 115 215 165 115
DN65 …100 60 75 110 110 175 155 110 200 155 110
DN150 ... 300 60 75 110 110 175 175 130 1 240 1 190 1 130 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T6 T5 T4 T3 T2 …T1
T
amb
in °F140 140 122 140 104 122 140 104 122 140
Nominal size
DN15 …25 140 167 230 230 347 347 1 257 1 455 1 356 1 257 1
DN40 …50 140 167 230 230 347 329 239 419 329 239
DN65 …100 140 167 230 230 347 311 230 392 311 230
DN150 ... 300 140 167 230 230 347 347 266 1 464 1 374 1 266 1
1Permanent service temperature of connecting cable and cable entry min. 176°F

DEVICE DESCRIPTION 2
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Permissible product and ambient temperatures with converter / connection box
sensor installed laterally or below the measuring section
Maximum permissible product and ambient temperatures per temperature class in °C
Maximum permissible product and ambient temperatures for temperature class in °F
Maximum permissible product and ambient temperatures for devices with painted
measuring sections (all sizes)
Temperature class T6 T5 T4 T3 T2 …T1
T
amb
in °C60 60 50 60 40 50 60 40 50 60
Nominal size
DN15 …25 60 75 110 110 175 175 1 145 1 240 1 205 1 145 1
DN40 …50 60 75 110 110 175 175 1 135 1 240 1 205 1 135 1
DN65 …100 60 75 110 110 175 175 1 130 1 240 1 195 1 130 1
DN150 ... 300 60 75 110 110 175 175 1 150 1 240 1 235 1 150 1
1Permanent service temperature of connecting cable and cable entry min. 80°C
Temperature class T6 T5 T4 T3 T2 …T1
T
amb
in °F140 140 122 140 104 122 140 104 122 140
Nominal size
DN15 …25 140 167 230 230 347 347 1 293 1 464 1 401 1 293 1
DN40 …50 140 167 230 230 347 347 1 275 1 464 1 401 1 275 1
DN65 …100 140 167 230 230 347 347 1 266 1 464 1 383 1 266 1
DN150 ... 300 140 167 230 230 347 347 1 302 1 464 1 455 1 302 1
1Continuous operating temperature of the connecting cable and cable entry min. 176°F
Temp. Class T6 T5 T4 …T1
T
amb
in 60°C140°F60°C140°F60°C140°F
T
M
60°C140°F75°C167°F90°C194°F

2 DEVICE DESCRIPTION
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2.8 Electrical data
Signal circuits
Signal circuitsSignal circuits
Signal circuits
The vortex flowmeter signal circuits may only be connected to separate, intrinsically safe
circuits. The maximum permissible values considered safe are listed below. The connection may
only be made using separately certified intrinsically safe isolating amplifiers or zener barriers
with the following maximum values per circuit:
•U
i
=30V
•I
i
= 100 mA
•P
i
=1,0W
The following values are to be observed for each intrinsically safe circuit in case of
interconnection:
•C
i
=15nF
•L
i
≈600 µH
Sensor circuits
Sensor circuitsSensor circuits
Sensor circuits
With the compact device, the intrinsically safe sensor circuits are designed as internal circuits.
When it comes to the remote versions, the intrinsically safe sensor circuits are led through. The
maximum permissible values of the sensor circuits considered safe are listed below:
Piezo / Pt1000 circuit
•U
o
=30V
•I
o
=62mA
•P
o
= 340 mW
•C
o
=22nF
•L
o
= 0,35 mH
Pressure transmitter circuit
•U
o
=30V
•I
o
= 100 mA
•P
o
= 509 mW
•C
o
=44nF
•L
o
=0,4mH

INSTALLATION 3
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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.
Vortex 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.
Converter alignment
The converter may be aligned on the base in 90°increments up to a maximum of ±180°.
For this reason, the four M6 hexagon socket screws connecting the base and the converter must
be loosened. Once the converter has been turned, it must be screwed back on to the base again
(tightening torque 6 Nm).
•De-energise the converter.
•Loosen the 4 hexagon socket screws.
•Turn the converter.
•Screw base to converter once again.
1Screws used to assemble base and converter
CAUTION!
The manufacturer is not liable for any damage resulting from improper use or use for 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.

3 INSTALLATION
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3.2 Special Conditions
Equipotential bonding
Vortex flowmeter converters must be included in the equipotential bonding of the hazardous
area.
Electronics compartment lock
The vortex flowmeter's flameproof electronics compartment must be closed during operation.
The cover of the electronics compartment is secured by a lock. An SW3 hexagon socket screw is
used for the safety screw . With temperature classes T6 and T5, a waiting time of 1 minute must
be observed prior to opening. For temperature classes T4...T1 the waiting time is not needed.
INFORMATION!
Lock on terminal compartment
Lock on terminal compartmentLock on terminal compartment
Lock on terminal compartment
The terminal compartment may be opened in hazardous areas when measuring and carrying out
adjustments.

ELECTRICAL CONNECTIONS 4
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4.1 General notes
The separate intrinsically safe signal circuits are electrically connected in the terminal
compartment of the converter. The separate intrinsically safe sensor circuits are connected in
the terminal compartments on the wall bracket and sensors. The circuits are designed in type of
protection "Intrinsic safety".
The connecting cables for signal circuits must be selected and connected according to prevailing
installation standards (e.g. EN 60079-14). Ensure that no residual current can form between
separate intrinsically safe signal circuits. The connecting cable for the sensor is included in
delivery.
•The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
•Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring unit and the connecting cable.
•The outer diameter of the connecting cable must be within the sealing range of the cable
entry (10...14 mm / 0.4...0.55").
•Unused cable entries are to be closed (>IP67).
Ensure that the seals and cut seals are tight.
4.2 Power supply
Vortex flowmeters do not require a separate power supply. The required supply is provided via
the 4...20 mA current output.
4.3 Inputs / outputs
When connecting the vortex flowmeters, observe the following points:
•Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
•All cores and shields belonging to the connecting cables that are not securely fitted to the
equipotential bonding of the hazardous area are to be carefully isolated from each other and
from ground (test voltage 500 V
eff
).
•Any existing cable shields should be connected to earth according to applicable installation
standards (EN 60079-14). A terminal connection in the terminal compartment permits a short
way earthing of the cable shields.
•Only certified intrinsically safe equipment may be connected to the intrinsically safe signal
outputs, taking into account the maximum permissible values. The signal outputs must be
connected to separate, intrinsically safe circuits.
The current output and the pulse / status output is designed for connection to a certified,
intrinsically safe circuit, protection type: intrinsic safety Ex ia IIC or Ex ib IIC.
The current output is safely separated from the pulse / status output up to a peak value of 60V
rated voltage. Both circuits are galvanically isolated from the earth.

4 ELECTRICAL CONNECTIONS
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4.4 Earthing and equipotential bonding
For compact measuring devices and measuring sections with flange connections, the connection
may be made via a conducting connection of the sensor to the pipe. For compact measuring
devices and "sandwich" type measuring sections, a separate wire must be provided to connect to
the equipotential bonding. This wire is connected to the outer PA terminal.
Remote systems can either be included in the equipotential bonding via the PA connection in the
converter's terminal compartment or via the external PA connection on the wall bracket.
CAUTION!
Equipotential bonding
Equipotential bondingEquipotential bonding
Equipotential bonding
Vortex flowmeter converters must be included in on-site equipotential bonding as per EN60079-
14! They are connected to the PA terminals.
1 Terminal compartment closed
2 Terminal compartment open
3 Connection A: Current output 4...20 mA (-)
4 Connection A+:Current output 4...20 mA (+)
5 Connection B: pulse / status output (-)
6 Connection B+: pulse / status output (+)
7 PA connection interior
8 PA connection exterior

ELECTRICAL CONNECTIONS 4
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4.5 Sensor circuits (remote version only)
Observe the following points when connecting the sensor to the converter:
•Use only the supplied connecting cable (max. length 30 m / 98 ft).
•Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
•Connect the connecting cable shield to the equipotential bonding of the hazardous area using
the stress resisting clamp in the wall bracket. Sensor-side, the shield must be carefully
isolated from the earth (Test voltage 500 V
eff
).
•The intrinsically safe pressure transmitter circuit (pressure, terminals 1-5) and the
intrinsically safe piezo / Pt1000 circuit (piezo, terminals 1-3 and Pt1000, terminals 1-2) are to
be galvanically isolated from one another and from the earth along the complete length up to
the connections in the wall bracket.
The separate sensor circuits are designed in type of protection intrinsic safety Ex ia IIC.

5 OPERATION
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5.1 Start-up
Start-up may only commence when the vortex 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 (flameproof enclosure) 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
Vortex 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.
Vortex 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 (type of protection: flameproof enclosure)
in hazardous areas is only permitted in a de-energised state and after complying with the waiting
time. The waiting time (1 minute) only applies to temperature classes T6 and T5.
Terminal compartments (type of protection: Intrinsic safety) may be opened even in an energised
state in hazardous area. Work on electrical connections (e.g. configuration via the HART
®
interface) is also permitted in an energised state. Terminal compartments must be closed
immediately upon completion of the work.

SERVICE 6
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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:
•Checking the housing, the conduit entry/entries and the feed lines for corrosion and/or
damage.
•Checking the measuring section and the piping connections for leaks.
•Checking the measuring section and the indicator for dust deposits.
6.2 Dismantling
General notes
The cover must be opened using a suitable tool (e.g. strap wrench) to avoid damage to the cover.
Any replacement or dismantling 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.
After opening the converter, grease the flameproof threaded joints of the converter´s cover
including the cover seals if necessary. Use the multi-purpose grease NONTRIBOS
®
, type Li EP2.
Display
The display can be freely rotated in 90°increments. It is connected to the connector pictured on
the next page. The device should be de-energised before opening the flameproof enclosure.
Observe warning without fail.
Exchanging the device insert
It is permitted to replace a complete device insert VFC070 / SITRANS FX300 with a version
constructed in the same way.
CAUTION!
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.
Strictly observe the 1 minute waiting time prior to opening the flameproof enclosure. This is
indicated on the nameplate of the converter for temperature classes T6 and T5.
The waiting period is not necessary for any of the other temperature classes.

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Take special note of the following figure and:
•ensure that the construction is the same by checking the nameplates.
•the connecting cable of the sensor circuits is to be laid in the cutout provided on the printed
circuit board. Avoid damage such as that caused by crushing.
•proper connection of the sensor 3and the display connector 1
•tighten the mounting screws M4 5evenly
The device shall be de-energised before opening the flameproof enclosure. Observe warning
without fail.
Exchanging the entire device
Removal and installation are the responsibility of the operator.
Before disconnecting the electric connecting cable of the device, it must be ensured that all of
the cables leading to the indicator part are de-energised relative to each other and to the
reference potential of the hazardous area. This also applies to functional earthing conductors
(FE) and equipotential bonding conductors (PA).
1 Display connection
2 Version number, software
3 Sensor connection
4 Mounting bolts, display
5 Mounting screw device insert
6 Nameplate device insert
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.

NOTES 7
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