Mettler Toledo O2 Sensor InPro6950 Gas Mode d'emploi

Taper
Mode d'emploi
InPro 6950 Optical O2 Sensors
52 206 137 F
InPro 6950
Optical O2 Sensors
Instruction manual
Bedienungsanleitung
Instructions d’utilisation
INGOLD
Leading Process Analytics
2 InPro 6950 Series O2 Sensor 12 mm
InPro 6950 © 02 / 2023 METTLER TOLEDO
52 206 137 F Printed in Switzerland
English Page 3
Deutsch Seite 41
Français Page 78
InPro 6950 Series O2 Sensor 12 mm 3
© 02 / 2023 METTLER TOLEDO InPro 6950
Printed in Switzerland 52 206 137 F
InPro 6950
Series O2 Sensors
Instruction manual
InPro, InFit, InTrac and ISM are trademarks of the METTLER TOLEDO
Group.
4 InPro 6950 Series O2 Sensor 12 mm
InPro 6950 © 02 / 2023 METTLER TOLEDO
52 206 137 F Printed in Switzerland
1 Introduction ................................................................ 5
2 Important notes ..........................................................6
2.1 Notes on operating instructions .....................................6
2.2 Intended use ...............................................................6
2.3 Safety instructions ........................................................ 7
2.4 Environmental protection ..............................................9
2.5 Examples of some typical applications ........................... 9
2.6 Use in Ex-zones ..........................................................9
2.7 Ex-classicationATEX ................................................10
2.7.1 Introduction ............................................................... 10
2.7.2 Rated data ................................................................10
2.7.3 Special conditions .....................................................11
2.8 Ex-classication–FMapproved ..................................12
2.8.1 Introduction ............................................................... 12
2.8.2 Rated data ...............................................................13
2.8.3 Special conditions .....................................................13
2.8.4 Applied standards: .....................................................14
3 Product description ................................................... 15
3.1 General information ...................................................15
3.2 Principle ...................................................................15
3.3 Scope of delivery .......................................................16
3.4 Equipment features ....................................................17
4 Installation ............................................................... 18
4.1 Mounting the sensor ..................................................18
4.2 Connection ...............................................................19
4.2.1 Connecting the InPro 6950 to a VP cable .....................19
4.2.2 Connecting the VP cable to the transmitter ....................19
5 Operation .................................................................20
5.1 Start-up and polarizing ...............................................20
5.2 Calibration ................................................................21
5.2.1 Purpose of calibration ................................................21
5.2.2 What you have to know for calibration .........................21
5.2.3 Single point calibration ...............................................22
5.2.4 Dual point calibration .................................................22
6 Maintenance ............................................................23
6.1 Inspection of the sensor .............................................. 23
6.1.1 Visual inspection .......................................................23
6.1.2 Testing the METTLER TOLEDO
O2 sensor master InPro 6950 .....................................24
6.1.3 Testing the sensor via a transmitter ..............................25
6.2 Changing the electrolyte,
the membrane body or the interior body .......................26
7 Storage ....................................................................29
8 Productspecication ................................................30
8.1 Certicates ................................................................30
8.2 Specications ............................................................31
9 Ordering information ................................................32
9.1 Sensors ....................................................................32
9.2 Accessories ............................................................... 32
9.3 Spare parts ...............................................................32
9.4 Recommended transmitters ......................................... 33
9.5 Recommended housings ............................................33
10 Theory of the polarographic sensor ............................34
10.1 Introduction ............................................................... 34
10.2 Principle of the design of an oxygen electrode ...............35
10.3 Parameters determining current ...................................36
10.4 Polarization voltage ...................................................37
10.5 Temperature ..............................................................37
10.6 Dependenceonow ..................................................37
10.7 Oxygenpartialpressure–
oxygen concentration .................................................38
Contents
InPro 6950 Series O2 Sensor 12 mm 5
© 02 / 2023 METTLER TOLEDO InPro 6950
Printed in Switzerland 52 206 137 F
1 Introduction
Thank you for buying the InPro™ 6950 sensor from
METTLER TOLEDO.
The construction of the InPro 6950 sensors employs
leading edge tech nology and complies with safety
regulations currently in force. Notwithstanding this,
improper use could lead to hazards for the user
or a third-party, and/or adverse effects on the plant or
other equipment.
Therefore, the operating instructions must
be read and understood by the persons involv ed
before work is started with the sensor.
The instruction manual must always be stored close
at hand, in a place accessible to all people working
with the InPro 6950.
 Ifyouhavequestions,whicharenotorinsufciently
answered in this instruction manual, please contact
your METTLER TOLEDO supplier. They will be glad to
assist you.
6 InPro 6950 Series O2 Sensor 12 mm
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52 206 137 F Printed in Switzerland
2 Important notes
2.1 Notes on operating instructions
These operating instructions contain all the informa-
tion needed for safe and proper use of the InPro 6950
sensor.
The operating instructions are intended for personnel
entrusted with the operation and maintenance of the
sensors. It is assumed that these persons are familiar
with the equipment in which the sensor is installed.
Warning notices and symbols
 Thisinstructionmanualidentiessafetyinstructions
and additional information by means of the following
symbols:
This symbol draws attention to safety instructions
and warnings of potential danger which, if neglect-
ed, could result in injury to persons and/or damage
to property.
Thissymbolidentiesadditional information and
instructions which, if neglected, could lead to
defects,inefcientoperationandpossiblelossof
production.
2.2 Intended use
METTLER TOLEDO InPro 6950 sensors are intended
solely for inline measurement of the oxygen par-
tial pressure in liquids and gases, as described in
this instruction manual.
Any use of these sensors which differs from or ex-
ceeds the scope of use described in this instruction
manual will be regarded as inappropriate and incom-
patible with the intended purpose.
The manufacturer/supplier accepts no responsibility
whatsoever for any damage resulting from such
improper use. The risk is borne entirely by the user/
operator.
Other prerequisites for appropriate use include:
– compliancewiththeinstructions,notesand
requirements set out in this instruction manual.
– acceptanceofresponsibilityforregularinspection,
maintenance and functional testing of all asso ci-
ated components, also including compliance with
local operational and plant safety regulations.
– compliancewithallinformationandwarnings
given in the documentation relating to the products
used in conjunction with the sensor (housings,
transmitters, etc.).
– observanceofallsafetyregulationsgoverningthe
equipment in which the sensor is installed.
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– correctequipmentoperationinconformancewith
the prescribed environmental and operational con-
ditions, and admissible installation positions.
– consultationwithMETTLER TOLEDO Process Ana-
lytics in the event of any uncertainties.
2.3 Safety instructions
– Theplantoperatormustbefullyawareofthe
potential risks and hazards attached to operation
of the particular process or plant. The operator is
responsible for correct training of the workforce, for
signs and markings indicating sources of possible
danger, and for the selection of appropriate, state-
of-the-art instrumentation.
– Itisessentialthatpersonnelinvolvedinthe
commissioning, operation or maintenance of these
sensors or of any of the associated equipment
(e.g. housings, transmitters, etc.) be properly
trained in the process itself, as well as in the use
and handling of the associated equipment. This
includes having read and understood this
instruction manual.
– Thesafetyofpersonnelaswellasoftheplant
itself is ultimately the responsibility of the plant
operator. This applies in particular in the case of
plants operating in hazardous zones.
– Theoxygensensorsandassociatedcomponents
have no effect on the process itself and cannot
inuenceitinthesenseofanyformofcontrol
system.
– Maintenanceandserviceintervalsandschedules
depend on the application conditions, composi-
tion of the sample media, plant equipment and
signicanceofthesafetycontrolfeaturesofthe
measuring system. Processes vary considerably,
sothatschedules,wheresucharespecied,can
only be regarded as tentative and must in any
casebeindividuallyestablishedandveriedby
the plant operator.
– Wherespecicsafeguardssuchaslocks,labels,
or redundant measuring systems are necessary,
these must be provided by the plant operator.
– Adefectivesensormustneitherbeinstallednor
put into service.
– Onlymaintenanceworkdescribedinthisoperating
instruction may be performed on the sensors.
– Whenchangingfaultycomponents,useonly
original spare parts obtainable from your
METTLER TOLEDO supplier (see spare parts list,
“Section 9.3”).
8 InPro 6950 Series O2 Sensor 12 mm
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– Nomodicationstothesensorsandtheaccesso-
ries are allowed. The manufacturer accepts no re-
sponsibility for damages caused by unauthorised
modications.Theriskisborneentirelybythe
user.
– Whenusingcablesforsensorconnectionnotsup-
plied and recommended by the manufacturer the
following standards need to be considered:
US National Electrical Code® (ANSI/NFPA 70
[NEC®]), where applicable.
Canadian Electrical (CE) Code® (CEC Part 1,
CAN/CSA-C22.1), where applicable.
− ForguidanceonUSinstallations,seeANSI/ISA-
RP12.06.01, Installation of Intrinsically Safe
SystemsforHazardous(Classied)Locations.
− Controlroomequipmentconnectedtointrinsically
safe associated apparatus in the US should not
useorgeneratemorethanthespeciedUmofthe
associated apparatus.
− Caremustbetakenduringinstallationtoavoid
impacts or friction that could create an ignition
source.
− Tamperingandreplacementwithnon-factorycom-
ponents may adversely affect the safe use of the
system.
− Insertionorwithdrawalofremovableelectrical
connectors or modules is to be accomplished only
whentheareaisknowntobefreeofammable
vapors.
− WARNING !
INTRINSICALLY SAFE APPARATUS CAN BE A
SOURCE OF IGNITION IF INTERNAL SPACINGS ARE
SHORTED OR CONNECTIONS OPENED.
− WARNING !
 DONOTOPENWHENANEXPLOSIVEATMO-
SPHERE IS PRESENT.
− WARNING !
SUBSTITUTION OF COMPONENTS MAY IMPAIR
INTRINSIC SAFETY.
− WARNING !
SUBSTITUTION OF COMPONENTS MAY IMPAIR
SUITABILITY OF THE EQUIPMENT.
− WARNING !
FOR CONNECTION ONLY TO NON-FLAMMABLE
PROCESSES.
− WARNING !
TO MAINTAIN THE ENCLOSURE IP66 RATING,
THE CONNECTOR MUST BE FULLY ENGAGED.
InPro 6950 Series O2 Sensor 12 mm 9
© 02 / 2023 METTLER TOLEDO InPro 6950
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2.4 Environmental protection
Waste electrical products sh ould not be
disposed of with household waste. Please
recycle where facilities exist. Check with
your Local Authority or retailer for recycling
advice.
2.5 Examples of some typical applications
 Belowisalistofexamplesoftypicaleldsof
application for the oxygen sensors. This list is
not exhaustive.
Measurement in liquids:
– Brewing
– Beverageltration
– Fillingstations
– Springwaterconditioning
Measurement in gases:
– CO2 recovery
– CO2 purity
– Productstorage
– Inertproduction
2.6 Use in Ex-zones
Attention!
For an installation in Ex-zones please read the
guidelines following hereafter:
1258 2503
 Ex-classicationATEX:
x II 1/2G Ex ia IIC T6...T3 Ga/Gb
x II 1/2D Ex ia IIIC T69 °C...T161 °C Ga/Db
 Numberofthetestcerticate:
SEV14ATEX0169X
 IECExSEV14.0026X
CML22UKEX2212X
 Ex-classicationFMapproved:
IS / I, II, III / 1 / ABCDEFG / T6 Ta = 60 °C
- 53 800 002; Entity
Project ID: 3021227
 FMcerticatenumber:FM16US0034X
FM18CA0021X
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2.7 Ex-classicationATEX
2.7.1 Introduction
According to Directive 2014/34/EU (ATEX114)1)
Appendixl,lnPro6XXX*/*/*/*/*oxygensensorsare
devices group ll, category 1/2G and according to
RL99/92/EG(ATEX137)2) may be used in zones
0/1 or 1/2 or 1 or 2 and gas groups llA, llB and llC
that are potentially explosive due to combustible
substances in above stated temperature classes.
For use / installation, the requirements of EN 60079-
14 must be observed.
According to Directive 2014/34/EU (ATEX114)1)
Appendixl,lnPro6XXX*/*/*/*/*oxygensensorsare
devices group ll, category 1/2D and according to
RL99/92/EG(ATEX137)2) may also be used in zones
20/21 or 21 or 22 that contain combustible dusts.
The digital sensor circuit is part of a common intrinsi-
cally safe system and is for operation connected to a
separatelycertiedtransmitter.
The digital sensor circuit as part of an intrinsically
safe system is isolated from the not-intrinsically safe
electric circuits up to a maximum rated voltage of
375 V and from grounded parts up to a maximum
rated voltage of 30 V.
2.7.2 Rated data
Measuring circuit
Intrinsically safe ignition protection class Ex ia IIC on-
lyforconnectiontoacertiedintrinsically safe circuit.
Analog O2 oxygen sensor maximum values
Ui≤16V
Ii ≤190mA
Pi≤200mW
Li = 0 (effective internal inductance)
Ci = 900 pF (effective internal capacitance)
h Note: The above maximum values are each the total
of all individual circuits of the associated intrinsically
safe power supply and transmitter.
1) For UK statutory Requirements SI 2016 No. 1107
2) For UK regulations 7 and 11 of the Dangerous Substances and
Explosive Atmospheres Regulations 2002 (DSEAR)
InPro 6950 Series O2 Sensor 12 mm 11
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2.7.3 Special conditions
– Therelationshipbetweenthemaximumpermissi-
ble ambient or media temperature and tempera-
ture class, for category 1G applications, zone 0, is
shown in the following table:
Temperature class Max. ambient or
media temperature
T 6 68 °C
T 5 80 °C
T 4 108 °C
T 3 160 °C
– Therelationshipbetweenthemaximumpermissi-
ble ambient or media temperature and temperature
class, for category 1D applications, zone 20, is
shown in the following table:
Temperature class Max. ambient or
media temperature
T 69 °C 68 °C
T 81 °C 80 °C
T 109 °C 108 °C
T 161 °C 160 °C
– Thecapacitanceandinductanceoftheconnecting
cable has to be considered.
– TheO2OxygensensortypeInPro6XXXcanbe
usedin/withthettingsInFit76*-***orIn-
Trac™7**-***,orin/withothersuitablettings
in potentially explosive areas.
– ThemetalbodyoftheO2 Oxygen sensors, or the
ttingsInFit76*-***orInTrac7**-***,orother
appropriatettingisoptionallyincludedintherou-
tine pressure test of the system.
– TheindependentttingusedforinstallationofO2
Oxygen sensor must be conductively connected to
the equipotential bonding system.
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2.8 Ex-classication–FMapproved
2.8.1 Introduction
The following FM control drawing and the standards
listed in section 2.8.4 must be observed, where ap-
plicable:
METTLER TOLEDO
Drawn Schinhammer, Bernhard 13-Feb-2018
Format A3
Change Zaugg, Lukas 14-Mar-2022
Title Refer to protection notice ISO 16016
FM control drawing
ERP Number ERP Revision
Design Rev I Status WIP Units MM 1/1
AApppprroovveedd
5533880000000022
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2.8.2 Rated data
For rated data please observe section 2.7.2.
2.8.3 Special conditions
In type of protection intrinsically safe apparatus, the
analyticalprobes(InPro6000SerieswithInFit76X/Y
andInTrac7XX/YYSerieshousings)equipmentis
designatedwiththefollowingspecicconditionsof
use.
1. The dissolved oxygen sensor shall be installed in
compliance with the enclosure, mounting, spac-
ing and segregation requirements of the ultimate
application, including a tool removable cover, and
issuitableforusewithFMApprovedInFit76X/Y
andInTrac7XX/YYSerieshousings.
2. Process temperature no greater than +130 ºC.
3. Maximum permissible working pressure is
12 barg (174 psig).
4. PotentialElectrostaticChargingHazard–
To prevent the risk of electrostatic sparking, the
non-metallic surface should only be cleaned with
a damp cloth.
5. Enclosures containing titanium constitute a poten-
tial risk of ignition by impact or friction. Care must
be taken into account during installation and use
to prevent impact or friction.
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2.8.4 Applied standards:
United States Standards
Title Number Issue
Date
Approval Standard for
Electrical Equipment
for Use in Hazardous
(Classied)Locations–
General Requirements
FM Class 3600 2022
Approval Standard for
Intrinsically Safe Appa-
ratus and Associated
Apparatus for Use in
Class I, II & III, Division 1,
Hazardous(Classied)
Locations
FM Class 3610 2021
Approval Standard for
Electrical Equipment for
Measurement, Control
and Laboratory Use
FM Class 3810 2021
ExplosiveAtmospheres–
Part0:Equipment–Ge-
neral Requirements
ANSI/UL
60079-0:2020
2020
ExplosiveAtmospheres–
Part 11: Equipment
Protection by Intrinsic
Safety “i”
ANSI/UL
60079-11:2018
2018
Safety Requirements for
Electrical Equipment for
Measurement, Control,
andLaboratoryUse–
Part 1: General Require-
ments
ANSI/UL
61010-1:2018
2018
Canadian Standards
Title Number Issue
Date
ExplosiveAtmospheres–
Part0:Equipment–Ge-
neral Requirements
CAN/CSA-C22.2
No. 60079-0:2019
2019
ExplosiveAtmospheres–
Part 11: Equipment
Protection by Intrinsic
Safety “i”
CAN/CSA-C22.2
No. 60079-11-
14:R2018
R2018
Safety Requirements for
Electrical Equipment for
Measurement, Control,
andLaboratoryUse–
Part 1: General Require-
ments
CAN/CSA-C22.2
No. 61010-1-
12:R2017
R2017
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3 Product description
3.1 General information
The oxygen sensor InPro 6950 with integrated tem-
perature probe is used for meas ure ment of oxygen at
low concentrations.
The sensor is sterilizable and compatible with CIP
(cleaning in place).
InPro 6950 sensors with ISM functionality offer
Plug and Measure as well as enhanced diagnostics
features.
3.2 Principle
The InPro 6950 is a Clark polarographic O2 sensor
that has been expanded with a separate reference
and guard ring electrode. This 4-electrode system is
characterized as follows:
a) The measurement system of this InPro 6950
sensor consists of a working electrode (cathode),
a counter electrode (anode), a reference electrode
and a guard ring electrode. The measurement
system is separated from the process medium by
an oxygen permeable membrane.
b) The transmitter supplies a constant voltage to
the cathode and the guard ring electrode so that
oxygen can be reduced on both electrodes.
c) The oxygen molecules migrate from the measure-
ment medium through the membrane to the
cathode to which the voltage is supplied and are
reduced. At the same time, oxidation takes place
at the anode and oxygen and water are released
intotheelectrolyte.Thiscausesacurrenttoow
between the anode and cathode which is directly
proportional to the partial pressure of oxygen
(pO2) in the process medium.
d) The guard ring electrode built into the sensor
reduces the oxygen that migrates to the side of the
cathode and can distort the measurement.
The guard ring electrode therefore enables traces
of oxygen to be precisely determined at even the
lowest concentrations.
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The 4-electrode system of the InPro 6950 guarantees
a high degree of precision, rapid response and a low
detection limit.
Cathode (Pt)
4-electrode Measurement Technology
Guard (Pt)
Reference (Ag/AgCl)
Anode (Pt)
Pleasereferto“Section10–Theoryofthepolaro-
graphic sensor” for further information.
3.3 Scope of delivery
Each InPro 6950 sensor is supplied fully assembled
and factory-tested for correct function together with:
– aqualitycontrolcerticate
– inspectioncerticates3.1
(complying with EN 10204)
METTLER TOLEDO DO sensors are supplied with
ttedmembranebodylledwithelectrolyte
and covered with the watering cap and have been
checked for proper function.
See electrolyte order details at section „Spare Parts“,
9.3.
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3.4 Equipment features
12 mm sensor
Washer
Anode (Pt)
Cathode and Guard Ring
Watering Cap
Cap Sleeve (N-type)
O-ring
(silicone FDA/USP VI)
Membrane Body InPro 6950 (gas)
Retainer Nut
Reference (Ag/AgCl)
Interior Body
O-ring
(10.77 2.62 mm, silicone FDA)
O-ring
(9.0 1.0 mm, silicone FDA/USP VI)
Pg 13.5 Threaded Sleeve
VP Connector
(straight version)
18 InPro 6950 Series O2 Sensor 12 mm
InPro 6950 © 02 / 2023 METTLER TOLEDO
52 206 137 F Printed in Switzerland
4 Installation
4.1 Mounting the sensor
Important! Remove the watering cap before
mount ing the sensor.
Mounting the sensor in a housing
Please refer to the instruction manual of your housing
explaining on how to mount the sensor in place.
Mounting the sensor directly on a pipe or a vessel
The 12 mm sensors can be mounted directly through
a socket with inside thread Pg 13.5 and securely
tightened via the Pg 13.5 threaded sleeve.
Admissible mounting position
Zulässige Einbaulage
Positionement de montage admis
Inadmissible angle
Unzulässiger Winkel
Angle non admissible
52910094ME
15°1
InPro 6950 Series O2 Sensor 12 mm 19
© 02 / 2023 METTLER TOLEDO InPro 6950
Printed in Switzerland 52 206 137 F
4.2 Connection
4.2.1 Connecting the InPro 6950 to a VP cable
h The sensor is connected to the transmitter via a VP
cable. The VP cable ensures a secure connection
between the transmitter and the sensor under harsh
industrial conditions. The robust watertight IP 68 con-
nector housing guarantees maximum process safety.
Do not touch the sensor at the VP connector plug!
To connect the VP cable to the sensor align the slit of
the VP connector with the pin in the plug. Then tightly
screw the plug to fasten the two parts.
VP-Connector
Slit
Pin
Plug
VP-6 Cable for
Standard Use
4.2.2 Connecting the VP cable to the transmitter
O2 Transmitter
VP Cable
h Note: Cable assignment can be found in the
METTLER TOLEDO VP cable instruction manual.
h Note: For connecting the cable to the terminals of
the transmitter, please refer to the instructions given in
the METTLER TOLEDO transmitter manual.
20 InPro 6950 Series O2 Sensor 12 mm
InPro 6950 © 02 / 2023 METTLER TOLEDO
52 206 137 F Printed in Switzerland
5 Operation
Important! Beforeusingthesensorsforthersttime,
the electrolyte should be replaced (see “Chapter
6.2”). Due to possible adverse conditions during
transport and storage (e.g. airfreight; pressure and
temperature variations), the quality of the electrolyte
may become impaired. Poor electrolyte quality can
lead to erroneous measurement values.
5.1 Start-up and polarizing
Important! The watering cap must be removed before
mounting the sensor in the process.
 Whenthesystemisoperatedforthersttimeorif
the sensor has been disconnected from the voltage
source (transmitter or O2 sensor master) for longer
than 5 min utes, the sensor has to be polarized prior
to calibration by connecting it to the operating O2
transmitter or to a sensor master. After 6 hours, the
sensor is fully polarized and ready for operation.
During this time, it is recommended to keep the
wateringcaplledwithconditioningsolutiononthe
sensor(see“Section7–Storage”),especiallyifthe
sensor is being polarized for longer than 6 hours.
 Ashorterpolarizationperiodissufcientifthesensor
has been disconnected for only a few minutes. The
following table serves to establish the correct polar-
ization time in relation to the depolarization time.
Depolarization time1 Minimum required
tdepol [Min.] polarization time2 [Min.]
tdepol > 30 360
30 > tdepol > 15 6 tdepol
15 > tdepol > 5 4 tdepol
tdepol < 5 2 tdepol
1 Depolarization time: Time span in which the pola-
rization voltage is cut off from the sensor. This is
the case during:
– change of electrolyte
–change of membrane body
– the time the cable is disconnected or no
transmitter or sensor master is connected
to the cable.
2 Polarization time: Time span during which the
sensor is under a polarization volta
g
e.
Important! Setting of the polarization voltage on the
transmitter for correct measurements:
– Standardapplications:–675mV
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Mettler Toledo O2 Sensor InPro6950 Gas Mode d'emploi

Taper
Mode d'emploi