KROHNE OPTIFLUX Series Wiring diagram

Ex addendum
OPTIFLUX
OPTIFLUXOPTIFLUX
OPTIFLUX Supplementary instructions
Supplementary instructionsSupplementary instructions
Supplementary instructions
© KROHNE 07/2010 - 7309482600 - AD EX IFC 300 R06 en

CONTENTS
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OPTIFLUX
1 Introduction 4
1.1 Safety instructions from the manufacturer ..................................................................... 4
1.1.1 Disclaimer ............................................................................................................................... 4
1.1.2 Product liability and warranty ................................................................................................ 5
1.1.3 Information concerning the documentation........................................................................... 5
1.1.4 Warnings and symbols used................................................................................................... 6
1.1.5 Manufacturer .......................................................................................................................... 6
1.2 Safety instructions for the operator................................................................................. 7
1.3 Approvals .......................................................................................................................... 8
1.4 OPTIFLUX 2000 / 4000 ...................................................................................................... 9
1.4.1 Compact versions ................................................................................................................... 9
1.4.2 Field versions........................................................................................................................ 10
1.5 OPTIFLUX 5000 ............................................................................................................... 11
1.5.1 Compact versions ................................................................................................................. 11
1.5.2 Field versions........................................................................................................................ 12
1.6 OPTIFLUX 6000 ............................................................................................................... 13
1.6.1 Compact versions ................................................................................................................. 13
1.6.2 Field versions........................................................................................................................ 14
1.7 OPTIFLUX 7000 ............................................................................................................... 15
1.7.1 Compact versions ................................................................................................................. 15
1.8 IFC 300 F ......................................................................................................................... 16
1.9 Marking labels................................................................................................................ 17
2 Temperature limits 18
2.1 OPTIFLUX 2000 / 4000 .................................................................................................... 18
2.1.1 Compact versions ................................................................................................................. 18
2.1.2 Field versions........................................................................................................................ 20
2.2 OPTIFLUX 5000 ............................................................................................................... 22
2.2.1 Compact versions ................................................................................................................. 22
2.2.2 Field versions........................................................................................................................ 23
2.3 OPTIFLUX 6000 ............................................................................................................... 24
2.3.1 Compact versions ................................................................................................................. 24
2.3.2 Field versions........................................................................................................................ 25
2.4 OPTIFLUX 7000 ............................................................................................................... 26
2.4.1 Compact versions ................................................................................................................. 26
2.5 IFC 300 F ......................................................................................................................... 26
3 Connection diagrams for field versions 27
3.1 Signal cable A ................................................................................................................. 27
3.2 Signal cable B ................................................................................................................ 28
3.3 Equipotential bonding..................................................................................................... 29
3.4 Signal cable connections................................................................................................ 30

CONTENTS
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OPTIFLUX
4 Electrical connections 31
4.1 Installation instructions ................................................................................................. 31
4.2 Connection of IFC 300..................................................................................................... 33
4.3 Input/output connections ............................................................................................... 35
5 Maintenance and service 37
5.1 Maintenance ................................................................................................................... 37
5.2 Before and after opening................................................................................................ 37
5.3 Replacement of mains fuse............................................................................................ 38
6 Notes 39

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1.1 Safety instructions from the manufacturer
1.1.1 Disclaimer
The manufacturer will not be liable for any damage of any kind by using its product, including,
but not limited to direct, indirect, incidental, punitive and consequential damages.
This disclaimer does not apply in case the manufacturer has acted on purpose or with gross
negligence. In the event any applicable law does not allow such limitations on implied warranties
or the exclusion of limitation of certain damages, you may, if such law applies to you, not be
subject to some or all of the above disclaimer, exclusions or limitations.
Any product purchased from the manufacturer is warranted in accordance with the relevant
product documentation and our Terms and Conditions of Sale.
The manufacturer reserves the right to alter the content of its documents, including this
disclaimer in any way, at any time, for any reason, without prior notification, and will not be liable
in any way for possible consequences of such changes.

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1.1.2 Product liability and warranty
The operator shall bear responsibility for the suitability of the device for the specific purpose.
The manufacturer accepts no liability for the consequences of misuse by the operator. Improper
installation and operation of the devices (systems) will cause the warranty to be void. The
respective "Standard Terms and Conditions" which form the basis for the sales contract shall
also apply.
1.1.3 Information concerning the documentation
To prevent any injury to the user or damage to the device it is essential that you read the
information in this document and observe applicable national standards, safety requirements
and accident prevention regulations.
If this document is not in your native language and if you have any problems understanding the
text, we advise you to contact your local office for assistance. The manufacturer can not accept
responsibility for any damage or injury caused by misunderstanding of the information in this
document.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device. Special considerations and precautions are also described in the
document, which appear in the form of underneath icons.

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1.1.4 Warnings and symbols used
Safety warnings are indicated by the following symbols.
• HANDLING
HANDLINGHANDLING
HANDLING
This symbol designates all instructions for actions to be carried out by the operator in the
specified sequence.
iRESULT
RESULTRESULT
RESULT
This symbol refers to all important consequences of the previous actions.
1.1.5 Manufacturer
This instrument is developed and manufactured by:
KROHNE Altometer
Kerkeplaat 12
3313 LC Dordrecht
The Netherlands
DANGER!
This information refers to the immediate danger when working with electricity.
DANGER!
This warning refers to the immediate danger of burns caused by heat or hot surfaces.
DANGER!
This warning refers to the immediate danger when using this device in a hazardous atmosphere.
DANGER!
These warnings must be observed without fail. Even partial disregard of this warning can lead to
serious health problems and even death. There is also the risk of seriously damaging the device
or parts of the operator's plant.
WARNING!
Disregarding this safety warning, even if only in part, poses the risk of serious health problems.
There is also the risk of damaging the device or parts of the operator's plant.
CAUTION!
Disregarding these instructions can result in damage to the device or to parts of the operator's
plant.
INFORMATION!
These instructions contain important information for the handling of the device.
LEGAL NOTICE!
This note contains information on statutory directives and standards.

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For information, maintenance or service please contact your nearest local KROHNE
representative.
1.2 Safety instructions for the operator
These additional instructions are an extension to the handbook. All technical information as
described in the handbook is applicable, when not specifically excluded, completed or replaced
by the instructions in these additional instructions.
WARNING!
• Do not change the device. Unauthorized changes affect the explosion safety of the devices.
• The prescriptions and regulations as well as the electrical data described in the EC type
examination certificate must be obeyed.
• Beside the instructions for electrical installations in non-hazardous locations according to
the applicable national standard (equivalent to HD 384 or IEC 60364, e.g. VDE 0100),
especially the regulations in EN 60079-14 "Electrical installations in hazardous locations",
equivalent national standard (e.g. DIN VDE 0165 Part 1) or dust hazardous areas such as EN
61241-14 must be complied with!
• Installation, establishment, utilization and maintenance are only allowed to be executed by
personnel with an education in explosion safety!

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1.3 Approvals
The flowmeter system consists of a flow sensor and a signal converter. The approval numbers
are:
compact versions:
•OPTIFLUX 2300 C (= OPTIFLUX 2000 + IFC 300):
KEMA 04 ATEX 2077 X
•OPTIFLUX 4300 C (= OPTIFLUX 4000 + IFC 300):
KEMA 04 ATEX 2077 X
•OPTIFLUX 5300 C (= OPTIFLUX 5000 + IFC 300):
KEMA 04 ATEX 2127 X
•OPTIFLUX 6300 C (= OPTIFLUX 6000 + IFC 300):
KEMA 05 ATEX 2214 X
•OPTIFLUX 7300 SW/C and FL/C (= OPTIFLUX 7000 + IFC 300):
KEMA 10 ATEX 0105 X
field versions:
•OPTIFLUX 2000 F + IFC 300 F:
KEMA 04 ATEX 2125 X + KEMA 04 ATEX 2166
•OPTIFLUX 4000 F + IFC 300 F:
KEMA 04 ATEX 2125 X + KEMA 04 ATEX 2166
•OPTIFLUX 5000 F + IFC 300 F:
KEMA 04 ATEX 2126 X + KEMA 04 ATEX 2166
•OPTIFLUX 6000 F + IFC 300 F:
KEMA 07 ATEX 0020 X + KEMA 04 ATEX 2166
INFORMATION!
All type examination certificates can be downloaded from the website.

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1.4 OPTIFLUX 2000 / 4000
1.4.1 Compact versions
OPTIFLUX 2300 C / 4300 C is certified as a group II, category 2 GD equipment, if fitted with an IFC
300 signal converter without Ex ia signal in/outputs or as a group II, category 2 (1) GD equipment,
if fitted with a signal converter with Ex ia signal in/outputs.
It is therefore suitable for installation in gas hazardous areas zone 1 or 2, gas group IIC,
temperature class T6 (or T5)...T3 and dust hazardous areas zone 21 or zone 22, surface
temperature T85...150°C. Additionally, the Ex ia signal inputs/outputs of the signal converter
may run or originate from a Zone 0 Gas hazardous area.
Converter housing, connection compartment:
Converter housing, connection compartment:Converter housing, connection compartment:
Converter housing, connection compartment: with power supply (terminals L, N / L+, L-) and I/O
connections (terminals A, A+, A-, B, B-, C, C-, D and D-):
Ex e (Increased safety), optionally: Ex d (Flameproof Enclosure). For certain versions of the
signal converter the terminals A, A+, A-, B, B-, C, C-, D and D- are additionally Ex ia (Intrinsic
safety). Consult the table with the CG numbers for more details.
Converter housing, electronics compartment:
Converter housing, electronics compartment:Converter housing, electronics compartment:
Converter housing, electronics compartment: Ex d (Flameproof enclosure).
EEx marking OPTIFLUX 2300 C / 4300 C:
Nominal
NominalNominal
Nominal
diameter
diameterdiameter
diameter
EEx e connection compartment,
EEx e connection compartment,EEx e connection compartment,
EEx e connection compartment,
II 2 GD or II 2(1) GD
EEx d connection compartment,
EEx d connection compartment,EEx d connection compartment,
EEx d connection compartment,
II 2 GD or II 2(1) GD
2.5...15 ("me")
10...20 ("me") EEx dme [ia] IIC T6...T3 T85...150°CEEx dme [ia] IIC T6...T3 T85...150°C
25...150 ("d") EEx de [ia] IIC T6...T3 T85...150°CEEx d [ia] IIC T6...T3 T85...150°C
200...300 ("qe") EEx dqe [ia] IIC T6...T3 T85...150°CEEx dqe [ia] IIC T6...T3 T85...150°C
350...3000 ("e") EEx de [ia] IIC T6...T3 T85...150°CEEx de [ia] IIC T6...T3 T85...150°C
Optional:
Optional:Optional:
Optional:
25...150 ("qe") EEx dqe [ia] IIC T5...T3 T85...150°CEEx dqe [ia] IIC T5...T3 T85...150°C

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1.4.2 Field versions
OPTIFLUX 2000 F / 4000 F is certified as group II, category 2 GD equipment for gas hazardous
areas zone 1 and 2, gas group IIC, temperature classes T6 (or T5) ... T3 and dust hazardous areas
zone 21 and 22, surface temperature T85…150/160/180°C.
The connection box contains terminals for the connection of the field current and electrode
circuits:
Field current circuit
Field current circuitField current circuit
Field current circuit, in type of protection "Increased safety" (Ex e), terminals 7, 8 and 9:
U < 40 V (switched DC voltage, alternately +40 and -40 V), I = 125 mA (injected square wave
current),
Electrode terminals
Electrode terminalsElectrode terminals
Electrode terminals, in type of protection "Intrinsic safety" (Ex ia), terminals 1, 2, 3 and 4:
Ui = 20 V, Ii= 175 mA, Ci≈0 nF, Li≈0 mH.
The before mentioned intrinsically safe circuits shall, from the safety point of view, be
considered to be connected to ground.
The cable gland
cable glandcable gland
cable gland for the electrode circuit is - as intrinsic safe circuit - marked with a blue O-ring.
EEx marking OPTIFLUX 2000 F / 4000 F:
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter II 2 GD
10...20 ("me") EEx me ia IIC T6...T3 T85...150°C
25...150 ("d") EEx de ia IIC T6...T3 T85...180°C
200...300 ("qe") EEx qe ia IIC T6...T3 T85...150°C
350...3000 ("e") EEx e ia IIC T6...T3 T85...160°C
Optional:
Optional:Optional:
Optional:
25...150 ("qe") EEx qe ia IIC T5...T3 T85...180°C

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1.5 OPTIFLUX 5000
1.5.1 Compact versions
OPTIFLUX 5300 C is certified as group II, category 2 GD equipment if fitted with an IFC 300 signal
converter without Ex ia signal in/outputs or as a group II, category 2 (1) GD equipment, if fitted
with a signal converter with Ex ia signal in/outputs. It is therefore suitable for installation in gas
hazardous areas zone 1 and 2, gas group IIC, temperature class T6…T3 and dust hazardous
areas zone 21 or zone 22, surface temperature T85...180°C. Additionally, the Ex ia signal
in/outputs of the signal converter may run or originate from a Zone 0 gas hazardous area.
The sensor is available in "sandwich" and in "flange" version.
Converter housing, connection compartment:
Converter housing, connection compartment:Converter housing, connection compartment:
Converter housing, connection compartment:
with power supply (terminals L, N / L+, L-) and I/O connections (terminals A, A+, A-, B, B-, C, C-,
D and D-): Ex e (increased safety), optionally: Ex d (Flameproof enclosure). For certain versions
of the signal converter the terminals A, A+, A-, B, B-, C, C-, D and D- are additionally Ex ia
(Intrinsic safety). Consult the table with CG numbers for details.
Converter housing, electronics compartment:
Converter housing, electronics compartment:Converter housing, electronics compartment:
Converter housing, electronics compartment:
Ex d (Flameproof enclosure).
EEx marking OPTIFLUX 5300 C "sandwich":
EEx marking OPTIFLUX 5300 C "flange":
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter EEx e connection compartment,
EEx e connection compartment,EEx e connection compartment,
EEx e connection compartment,
II 2 GD or II 2(1) GD
EEx d connection compartment,
EEx d connection compartment,EEx d connection compartment,
EEx d connection compartment,
II 2 GD or II 2(1) GD
2.5...15 EEx dme [ia] IIC T6...T3 T85...150°CEEx dme [ia] IIC T6...T3 T85...150°C
25...100 EEx de [ia] IIC T6...T3 T85...150°CEEx d [ia] IIC T6...T3 T85...150°C
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter EEx e or EEx d connection compartment,
EEx e or EEx d connection compartment,EEx e or EEx d connection compartment,
EEx e or EEx d connection compartment,
II 2 GD or II 2(1) GD
15...100 EEx d e [ia] mb IIC T6...T3 T85...150°C

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1.5.2 Field versions
OPTIFLUX 5000 F is certified as group II, category 2 GD equipment for gas hazardous areas zone
1 and 2, gas group IIC, temperature classes T6…T3 and dust hazardous areas zone 21 and 22,
surface temperature T85...180°C.
The connection box contains terminals for the connection of the field current and electrode
circuits:
Field current terminals
Field current terminalsField current terminals
Field current terminals, in type of protection "Increased safety" (Ex e), terminals 7, 8 and 9:
U < 40 V (switched DC voltage, alternately +40 and -40 V), I = 125 mA (injected square wave
current).
Electrode terminals
Electrode terminalsElectrode terminals
Electrode terminals, in type of protection "Intrinsic safety" (Ex ia), terminals 1, 2, 3 and 4:
Ui= 20 V, Ii= 175 mA, Ci≈0 nF, Li≈0 mH.
The before mentioned intrinsically safe circuits shall, from the safety point of view, be
considered to be connected to ground.
The cable gland for the electrode circuit is - as intrinsic safe circuit - marked with a blue O-ring.
EEx marking OPTIFLUX 5000 F "sandwich":
EEx marking OPTIFLUX 5000 F "flange":
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter II 2 GD
2.5...15 EEx me ia IIC T6...T3 T85...180°C
25...100 EEx de ia IIC T6...T3 T85...180°C
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter II 2 GD
15...100 EEx e ia mb IIC T6...T3 T85...180°C

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1.6 OPTIFLUX 6000
1.6.1 Compact versions
OPTIFLUX 6300 C is certified as group II, category 2 GD equipment, if fitted with an IFC 300 signal
converter without Ex ia signal in/outputs or as a group II, category 2 (1) GD equipment, if fitted
with a signal converter with Ex ia signal in/outputs. It is therefore suitable for installation in gas
hazardous areas zone 1 and 2, gas group IIC, temperature classes T6…T3 and dust hazardous
areas zone 21 and 22, surface temperature T150°C. Additionally, the Ex ia signal in/outputs of the
signal converter may run or originate from a Zone 0 gas hazardous area.
Converter housing, connection compartment:
Converter housing, connection compartment:Converter housing, connection compartment:
Converter housing, connection compartment: with power supply (terminals L, N / L+, L-) and I/O
connections (terminals A, A+, A-, B, B-, C, C-, D and D-):
Ex e (Increased safety), optionally: EEx d (Flameproof Enclosure).
For certain versions of the signal converter, the terminals A, A+, A-, B, B-, C, C-, D and D- are
additionally Ex ia (Intrinsic safety). Consult the tables with CG numbers for details.
Converter housing, electronics compartment:
Converter housing, electronics compartment:Converter housing, electronics compartment:
Converter housing, electronics compartment: Ex d (Flameproof Enclosure)
EEx marking OPTIFLUX 6300 C:
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter EEx e connection compartment,
EEx e connection compartment,EEx e connection compartment,
EEx e connection compartment,
II 2 GD or II 2 (1) GD
EEx d connection compartment,
EEx d connection compartment,EEx d connection compartment,
EEx d connection compartment,
II 2 GD or II 2 (1) GD
2.5...15
25...80 EEx d mb e [ia] IIC T6...T3 T150°C

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1.6.2 Field versions
OPTIFLUX 6000 F is certified as group II, category 2 GD equipment for gas hazardous areas zone
1 and 2, gas group IIC, temperature classes T6…T3 and dust hazardous areas zone 21 and 22,
surface temperature T180°C.
The connection box contains terminals for the connection of the field current and electrode
circuits:
Field current circuit
Field current circuitField current circuit
Field current circuit, in type of protection "Increased safety" (Ex e), terminals 7, 8 and 9:
U < 50 V (switched DC voltage, alternately +40 and -40 V), I = 125 mA (injected square wave
current),
Electrode circuit
Electrode circuitElectrode circuit
Electrode circuit, in type of protection "Intrinsic safety" (Ex ia), terminals 1, 2, 3 and 4:
Ui = 20 V , Ii= 175 mA, Ci≈0 nF, Li≈0 mH.
The before mentioned intrinsically safe circuits shall, from the safety point of view, be
considered to be connected to ground.
The cable gland for the electrode circuit is - as intrinsic safe circuit - marked with a blue O-ring.
Ex marking OPTIFLUX 6000 F:
Nominal diameter
Nominal diameterNominal diameter
Nominal diameter II 2 GD
25...80 Ex e ia mb IIC T6...T3 T180°C

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1.7 OPTIFLUX 7000
1.7.1 Compact versions
OPTIFLUX 7300 SW/C or FL/C is certified as group II, category 2 G equipment if fitted with an
IFC 300 signal converter without Ex ia signal in/outputs or as group II, category 2 (1) G Equipment
if fitted with an IFC 300 signal converter with Ex ia signal in/outputs. It is therefore suitable for
installation in gas hazardous areas zone 1 and 2, gasgroup IIC, temperature class T6...T4.
OPTIFLUX 7300 SW/C or FL/C is also certified as group II, category 2 D equipment and is
therefore suitable for installation in dust hazardous areas zone 21 and 22, maximum surface
temperature T115°C.
Converter housing, connection compartment:
Converter housing, connection compartment:Converter housing, connection compartment:
Converter housing, connection compartment: With power supply (terminals L, N / L+, L-) and I/O
connections (terminals A, A-, A+, B, B-, C, C-, D, D-):
Ex e (Increased safety), optionally Ex d (Flameproof enclosure).
For certain versions of the signal converter, the terminals A, A-, A+, B, B-, C, C-, D, D- are
additionally Ex ia (Intrinsic safety).
Converter housing, electronics compartment:
Converter housing, electronics compartment:Converter housing, electronics compartment:
Converter housing, electronics compartment: Ex d (Flameproof enclosure)
Ex marking OPTIFLUX 7300 SW/C:
Ex marking OPTIFLUX 7300 FL/C:
Nominal diameter Ex e connection compartment Ex d connection compartment
25...100 II 2 G Ex d e IIC T6...T4 II 2 G Ex d IIC T6...T4
II 2(1) G Ex d e [ia] IIC T6...T4 II 2(1) G Ex d [ia] IIC T6...T4
II 2 D Ex tD A21 IP67 T115°CII 2 D Ex tD A21 IP67 T115°C
Nominal diameter Ex e connection compartment Ex d connection compartment
25...100 II 2 G Ex d e mb IIC T6...T4 II 2 G Ex d mb IIC T6...T4
II 2(1) G Ex d e mb [ia] IIC T6...T4 II 2(1) G Ex d mb [ia] IIC T6...T4
II 2 D Ex tD A21 IP67 T115°CII 2 D Ex tD A21 IP67 T115°C

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1.8 IFC 300 F
The IFC 300 F is certified as a group II, category 2 GD equipment, if fitted without Ex ia signal
in/outputs or as a group II, category 2 (1) GD equipment, if fitted with Ex ia signal inputs/outputs.
It is therefore suitable for installation in gas hazardous areas zone 1 or 2, gas group IIC,
temperature class T6 and dust hazardous areas zone 21 or 22, surface temperature T85°C.
Additionally, The Ex ia signal in/outputs of the converter may run or originate from a zone 0 gas
hazardous area.
In the IFC 300 F signal converter the following types of protections are used:
Converter housing, connection compartment:
Converter housing, connection compartment:Converter housing, connection compartment:
Converter housing, connection compartment: with power supply (terminals L, N / L+, L-) and I/O
connections (terminals A, A+, A-, B, B-, C, C-, D and D- ): Ex e (Increased safety). Optionally
compact flowmeters have Ex d (Flameproof Enclosure). For certain versions of the signal
converter the terminals A, A+, A-, B, B-, C, C-, D and D- are additionally Ex ia (Intrinsic safety).
Consult the table with CG numbers for details.
Converter housing, electronics compartment:
Converter housing, electronics compartment:Converter housing, electronics compartment:
Converter housing, electronics compartment: Ex d (Flameproof enclosure)
Field current circuit
Field current circuitField current circuit
Field current circuit, in type of protection "Increased safety" (Ex e), terminals 7,8 and 9:
U < 40 V (switched DC voltage, alternately +40 and -40 V), I = 125 mA (injected square wave
current). The field current source is protected by 2 TR5 fuses, rated value 160 mA. The maximum
prospective short circuit current is restricted to 35 A.
Electrode terminals
Electrode terminalsElectrode terminals
Electrode terminals, in type of protection "Intrinsic safety" (Ex ia), terminals 1, 2, 20, 3, 30, 4 and
40:
Uo = 14 V , Io= 70 mA, Po= 300 mW (lineair), Co= 430 nF, Lo= 2 mH.
The Ex marking is II 2 GD EEx de [ia] IIC T6 T85°C for converters with non Ex ia signal in/outputs
or II 2 (1) GD EEx de [ia] IIC T6 T85°C for converters with Ex ia signal in/outputs.

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1.9 Marking labels
The data sticker on the connection box of the separate flow sensor typically contains the
following information.
The data sticker on the converter typically contains the following information.
Figure 1-1: Data sticker on sensor
1 Name and address of the manufacturer
2 CE sign with number(s) of notified body / bodies
3 Specific sign for explosion protection
4 Number of EC type examination certificate
5 General EEx notes and warnings
6 Specific EEx notes and warnings
7 Type designation of the flowmeter
Figure 1-2: Example of a nameplate for compact version
1 Name and address of the manufacturer
2 CE Sign with number(s) of notified body / bodies
3 Specific sign for explosion protection
4 Number of EC type examination certificate
5 General EEx notes and warnings
6 Specific EEx notes and warnings
7 Power supply data
8 Type designation of the flowmeter
123 4
5
6
7
OPTIFLUX 4300 C

2TEMPERATURE LIMITS
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The temperature limits apply under the following conditions:
•The instrument is installed and operated in accordance with the installation directions given
in the installation and operating instructions.
•The instrument is not heated up by any additional heat radiation (direct solar radiation, heat
from adjacent plant parts) so causing it to operate above the permissible ambient
temperature range.
•Insulation is not hindering free ventilation of the signal converter housing.
2.1 OPTIFLUX 2000 / 4000
2.1.1 Compact versions
•The OPTIFLUX 2300 C / 4300 C is suitable for an ambient temperature range of
-40…+60°C.
•For dust hazardous areas, the maximum surface temperature is equal to the process
temperature with a minimum of 85°C.
•The minimum process temperature for all DN sizes is -40°C.
•The maximum process temperature is determined by the temperature class T6/T5...T3 of the
gas hazardous area of concern, the maximum ambient temperature (Ta), and the nominal
diameter. The temperature range is often limited further by the liner type used (refer to the
Quick Start).
DN2.5...15 ("me")
DN10...20 ("me")
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 70 70 60
T5 85 85 60
T4 120 120 60
T3 150 140 60
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 70 60 -
T5 95 85 60
T4 130 130 60
T3 150 150 1 60
1140°C for versions with stainless steel converter housing

TEMPERATURE LIMITS 2
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DN25...150 ("d")
DN25...150 ("qe")
DN200...300 ("qe") and DN350...3000 ("e")
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 80 80 80 1
T5 95 95 80 1
T4 130 130 80 1
T3 150 150 2 80 1
160°C for versions with stainless steel converter housing
2140°C for versions with stainless steel converter housing
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T5 50 - -
T4 100 95 80 1
T3 150 150 2 80 1
160°C for versions with stainless steel converter housing
2140°C for versions with stainless steel converter housing
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 80 80 75 1
T5 95 95 80 1
T4 130 130 80 1
T3 150 150 2 80 1
T3 3 130 130 80 1
160°C for versions with stainless steel converter housing
2140°C for versions with stainless steel converter housing
3For some versions the process temperature is restricted to 130°C. This version is identified by extra text (/RT) on the
data sticker

2TEMPERATURE LIMITS
20
OPTIFLUX
www.krohne.com 07/2010 - 7309482600 - AD EX IFC 300 R06 en
2.1.2 Field versions
•In general the OPTIFLUX 2000 F / 4000 F flow sensors are suitable for an ambient
temperature range of -40...+60°C.
•For dust hazardous areas the maximum surface temperature is equal to the process
temperature Tpwith a minimum of 85°C.
•The minimum process temperature is -40°C.
•The maximum process temperature Tp is dependent on the required temperature class
T6/T5...T3, the diameter and the maximum ambient temperature Ta. The temperature range
is often limited further by the liner type used (refer to the Quick Start).
DN10...20 ("me")
DN25...150 ("d")
DN200...300 ("qe")
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 75 70 70
T5 95 90 75
T4 130 115 75
T3 150 115 75
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 70 70 70
T5 85 85 85
T4 120 120 120
T3 180 180 180
Use heat resistant
cables for Tpabove: 1
Not needed 155 105
1Cables must withstand a continuous operating temperature of 85°C.
Temperature class Max. process temperature Tp [°C]
Ta≤40°C40 < Ta≤50°C50 < Ta≤60°C
T6 75 70 70
T5 95 90 75
T4 130 115 75
T3 150 115 75