Mettler Toledo InPro 6000G Series Manuel utilisateur

Taper
Manuel utilisateur
© 12 /15 Mettler-Toledo GmbH InPro 6000 G – Series
Printed in Switzerland 52 206 477
InPro®6000G Series
Gas Phase Oxygen Sensors
Instruction manual
Bedienungsanleitung
Instructions d’utilisation
2 InPro 6800G/6850i G/6900iG/6950i GO
212 mm
InPro 6000 G – Series © 12 /15 Mettler-Toledo GmbH
52 206 477 Printed in Switzerland
English Page 3
Deutsch Seite 42
Français Page 82
© It is forbidden to reprint this Instruction Manual in whole or part. No part of this
manual may be repro duced in any form, or modified, copied or distributed using
electronic systems, in particular in the form of photo copies, photographs, magnetic
or other recordings, without written consent of Mettler-Toledo GmbH, Process Analytics,
CH-8902 Urdorf, Switzerland.
All rights reserved, in particular reproduction, translation and patenting/registration.
InPro 6800G/6850i G/6900iG/6950i G O212 mm 3
© 12 /15 Mettler-Toledo GmbH InPro 6000 G – Series
Printed in Switzerland 52 206 477
InPro 6800G/6850i G/6900iG/6950i G O212 mm 3
1 Introduction.....................................................................4
2 Important notes ...............................................................5
2.1 Notes on operating instructions ..........................................5
2.2 Intended use ....................................................................5
2.3 Safety instructions.............................................................6
2.4 Examples of some typical applications................................7
2.5 Use in Ex-zones ...............................................................7
2.6 Ex-classification ATEX .......................................................8
2.6.1 Introduction......................................................................8
2.6.2 Rated data .......................................................................8
2.6.3 Special conditions.............................................................9
2.7 Ex-classification FM approved..........................................10
3 Product description........................................................11
3.1 General information ........................................................11
3.2 Principle ........................................................................11
3.3 Enhanced diagnostics (only for ISM types available) ..........13
3.4 Scope of delivery ............................................................14
3.5 Equipment features .........................................................15
4 Installation....................................................................16
4.1 Mounting the sensor........................................................16
4.2 Connection ....................................................................16
4.2.1 Connecting the sensor to a AK9 cable ...............................16
4.2.2 Connecting the cable to the transmitter ..............................17
5 Operation ......................................................................18
5.1 Start-up and polarizing....................................................18
5.2 Calibration .....................................................................19
5.2.1 Purpose of calibration .....................................................19
5.2.2 What you have to know for calibration ..............................19
5.2.3 Single point calibration....................................................20
5.2.4 Dual point calibration......................................................20
6 Maintenance .................................................................21
6.1 Inspection of the sensor...................................................21
6.1.1 Visual inspection ............................................................21
6.1.2 Using the METTLER TOLEDO O2sensor master ...................22
6.1.3 Testing the sensor via a transmitter...................................23
6.1.4 ISM design.....................................................................24
6.2 Changing the electrolyte,
the membrane body or the interior body ............................25
7 Storage.........................................................................28
8 Product specification .....................................................29
8.1 Certificates .....................................................................29
8.2 Specifications.................................................................30
9 Ordering information .....................................................32
9.1 Sensors .........................................................................32
9.2 Transmitter.....................................................................32
9.3 Accessoires....................................................................32
9.4 Spare parts ....................................................................33
9.5 Cables...........................................................................33
9.6 Recommended housings .................................................33
10 Theory of the polarographic sensor.................................34
10.1 Introduction....................................................................34
10.2 Principle of the design of an oxygen electrode....................34
10.3 Parameters determining current ........................................38
10.4 Polarization voltage ........................................................38
10.5 Temperature...................................................................39
10.6 Dependence on flow........................................................39
10.7 Oxygen partial pressure – oxygen concentration.................39
Contents
4 InPro 6800G/6850i G/6900iG/6950i GO
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InPro 6000 G – Series © 12 /15 Mettler-Toledo GmbH
52 206 477 Printed in Switzerland
1 Introduction
Thank you for buying the InPro 6800G/6850 iG/
6900 iG/6950 iG sensor from METTLER TOLEDO.
The construction of the InPro series employs leading
edge tech nology and complies with safety regula-
tions currently in force. Notwithstanding this, improp-
er 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 sensor.
If you have questions, which are not or insufficiently
answered in this instruction manual, please contact
your METTLER TOLEDO supplier. He will be glad to
assist you.
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© 12 /15 Mettler-Toledo GmbH InPro 6000 G – Series
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2 Important notes
2.1 Notes on operating instructions
These operating instructions contain all the information
needed for safe and proper use of the InPro 6800G /
6850iG/6900iG/6950 iGsensor.
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 identifies 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 identifies additional information and
instructions which, if neglected, could lead to
defects, inefficient operation and possible loss of
production.
2.2 Intended use
METTLER TOLEDO InPro 6800G/6850 iG/6900 iG/
6950 iG sensors are intended solely for inline
measurement of the oxygen partial 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 Analytics
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 equip-
ment (e.g. housings, transmitters, etc.) be proper-
ly 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
influence 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 ficance of the safety control features of the
measuring system. Processes vary considerably,
so that schedules, where such are specified, can
only be regarded as tentative and must in any
case be individually established and verified by
the plant operator.
Where specific 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 operat-
ing 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 9.4”).
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No modifications to the sensors and the acces-
sories are allowed. The manufacturer accepts no
responsibility for damages caused by unautho-
rised modifications. The risk is borne entirely by
the user.
2.4 Examples of some typical applications
Below is a list of examples of typical fields of
application for the oxygen sensors. This list is
not exhaustive.
Measurement in liquids:
Biotech
Chemical applications
Brewing
Beverage filtration
Filling stations
Measurement in gases:
CO2recovery
CO2purity
Product storage
Inert production
Offgas monitoring
2.5 Use in Ex-zones
Attention!
For an installation in Ex-zones please read the
guidelines following hereafter:
1258
Ex-classification ATEX:
Ex ia IIC T6/T5/T4/T3 Ga/Gb
Ex ia IIIC T69°C/T81°C/T109°C/T161°C Da/Db
Number of the test certificate:
SEV 14 ATEX 0169 X
IECEx SEV 14.0026X
Ex-classification FM approved:
IS/I, II, III/1/ABCDEFG / T6 Ta = 60 °C
- 53 800 002; Entity
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2.6 Ex-classification ATEX
2.6.1 Introduction
According to Directive 94/9/EC (ATEX 95) Appendix I,
the O2oxygen sensors type InPro 6XXX is a devices
of equipment group II, category 1/2G which, accord-
ing to Directive 99/92/EC (ATEX 137) can be used in
zones 0/1 or 1/2 or 1 or 2 as well as gas groups IIA,
IIB and IIC, which are potentially explosive due to
combustible substances in the temperature T3 to T6.
The requirements specified in EN 60079-14 must be
observed during use / installation.
According to Directive 94/9/EC (ATEX 95) Appendix
I, the O2oxygen sensors type InPro 6XXX is a de-
vices of equipment group II, category 1/2D which,
according to Directive 99/92/EC (ATEX 137) can be
used in zones 20/21 or 21/22 or 21 or 22, which
are potentially explosive due to combustible dust.
The requirements specified in EN 60079-14 must be
observed during use / installation.
For the analog version of the O2oxygen electrode, the
O2measurement circuit, temperature measurement
circuit and data chip circuit are part of the common
intrinsically safe system and are jointly connected to
and operated by a separately certified transmitter.
The digital version of the O2oxygen sensor is con-
nected to and operated by two-wire cable to the certi-
fied transmitter.
The intrinsically safe circuits are galvanically isolated
from the non-intrinsically safe circuits up to a nomi-
nal voltage peak value of 375 V and from the earthed
parts up to a nominal voltage peak value of 30 V.
2.6.2 Rated data
Analog O2Oxygen sensor
With type of protection: intrinsic safety to Ex ia IIC
O2measuring circuit, temperature measuring
circuit and data chip circuit
Only for connection to certified intrinsically safe cir-
cuits. Maximum values:
Ui16 V, Ii190 mA, Pi200 mW
Li= 0 (effective internal inductance)
Ci= 900 pF (effective internal capacitance)
The values above apply, each as the sum of all the
individual circuits of the associated intrinsically safe
supply and evaluation unit (transmitter).
Digital O2Oxygen sensor
With type of protection: intrinsic safety to Ex ia IIC
Two-wire current circuit
Only for connection to certified intrinsically safe cir-
cuits. Maximum values:
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Ui16 V, Ii30 mA, Pi50 mW
Li= negligible
Ci= negligible
2.6.3 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 tempera-
ture 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 fittings InFit 76*-*** or InTrac
7**-***, or in / with other suitable fittings in poten-
tially explosive areas.
The metal body of the O2Oxygen sensors, or the
fittings InFit 76*-*** or InTrac 7**-***, or other
appropriate fitting is optionally included in the rou-
tine pressure test of the system.
The independent fitting used for installation of O2
Oxygen sensor must be conductively connected to
the equipotential bonding system.
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2.7 Ex-classification FM approved
Non-Hazardous Location Hazardous (Classified) Location
Class I, Division 1, Groups A, B, C and D
Class II, Division 1, Groups E, F and G
Class III, Division 1
T6 Ta=60 °C
Any FMRC Approved Single
Multi-Channel Barrier or Apparatus
Probe
Mettler-Toledo GmbH
Process Analytics
CH-8902 Urdorf
11/12/2003 F. Kogelmann
15/07/2005 F. Trefz
FM control drawing
Wir behalten uns alle Rechte an diesem Dokument und an allen Beilagen vor. Der Empfänger anerkennt
diese Rechte und wird die genannten Unterlagen nicht ohne unsere vorgängige schriftliche Ermächtigung
Dritten zugänglich machen oder ausserhalb des Zweckes verwenden, zu dem sie ihm übergeben worden sind.
Entity Parameters:
Vt=15V, It=30 mA, Pmax =0.25W
Ci=0.1 µF, Li= 0 mH
Notes:
WARNING: substitution of components may inpair intrinsic safety.
1. No revision to this drawing is permitted without FMRC approval
2. Vmax > Vt; Imax > It; (Ci of all loops + C cable) < Ca; (Li of all loops + L cable) < La; Pmax or Pi > P0
3. Single Multi-Channel IS Barrier or Apparatus must be FMRC Approved
5. Installation must be in accordance with Article 500 of the NEC® (ANSI/NFPA 70)
and ANSI/ISA RP12.6.
4. Single Multi-Channel IS Barrier or Apparatus manufacturer's control drawings
must be followed when installing the System. IS Barrier or Equipment may be
installed within the Hazardous (Classified) location for which it is approved.
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3 Product description
3.1 General information
The oxygen sensor series InPro 6800G/6850iG/
6900iG/6950iG with integrated temperature probe
are used for meas ure ment of oxygen at low and
medium concentrations.
InPro 6xxxiG sensors with ISM functionality offer
Plug and Measure as well as enhanced diagnostics
features.
3.2 Principle
Amperometric oxygen sensors:
The amperometric oxygen sensors of METTLER
TOLEDO base all on the same mearuring principle
according to Clark. However different series are of-
fered, which clearly differ in the number and arrange-
ment of their electrodes and thus in their specifica-
tions:
The measurement system of the InPro sensors
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.
The measuring technique in principle is alike with
all sensors.
The transmitter supplies a constant voltage be-
tween cathode and anode.
The electrolyte creates a conductive connection
between the electrodes.
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.
This causes a current to flow between the anode
and cathode which is directly proportional to the
partial pressure of oxygen (pO2) in the process
medium. With digital ISM sensors, the sensor it-
self converts the current into oxygen concentration
and communicates the value to the transmitter.
The guard ring electrode of the InPro 6900i G and
6950i G built into the sensor reduces the oxygen
that migrates to the side of the cathode and can
affect the measurement. The guard ring electrode
therefore enables traces of oxygen to be precisely
determined at even the lowest concentrations.
Note: Please refer to “Section 10 Theory of the po-
larographic sensor” for further information.
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ISM Sensors:
All oxygen sensors with the index “i” (6850i G,
6900i G, 6950i G) are equipped with ISM, Intelligent
Sensor Management.
Principle: In the sensor head a chip is integrated,
which takes over the entire monitoring and control of
the sensor and, beyond that, stores all sensor data.
This chip is responsed via the transmitter.
The following data are available permanently in the
sensor:
type of sensor
serial no.
software version
hardware version
order no.
operating time
calibration time and calibration date
calibration table
To check the system, the following indicators are
monitored:
temperature
slope
zero current
air current
polarization voltage
cathode current and voltage
Based on these informations, the transmitter calcu-
lates a wear monitor and displays it depending upon
transmitter type differently. (see the respective in-
struction manuals)
ISM enables the connection of the digital sensor to
the iSense™ Asset Suite. The user-friendly software
allows to manage all sensor information and store it
in a data base. Furthermore, the sensor can be cali-
brated via the iSense™ software.
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3.3 Enhanced diagnostics
(only for ISM types available)
DLI Dynamic Lifetime Indicator The dynamic lifetime
indication allows an estimation, when the sensor in-
ner body is at the end of his lifetime, based on the
actual stress it is exposed to. The sensor permanent-
ly takes the averaged stress of the past days into
consideration and is able to increase/decrease the
lifetime accordingly.
The following parameters affect the lifetime indicator:
Dynamic parameters:
Temperature
Oxygen value
Static parameters:
Calibration history
Zero and Slope
The sensor keeps the information stored in the built-
in electronics and can be retrieved via a transmitter
or the iSense asset management suite.
The alarm will be resetted if the Lifetime Indicator is
not 0 days anymore (e.g. after connecting a new
sensor or changes on the measurement conditions)
For amperometric oxygen sensors, the lifetime indi-
cator is related to the inner-body of the sensor. After
exchanging the inner-body, reset the lifetime indicator
in the ISM setup menu (Menu Configure).
TTM Time to Maintenance:
This timer defines when the next electrolyte or mem-
brane replacement should be done to maintain the
best possible measurement performance. The timer
depends on the DLI parameters.
The sensors InPro 6850i G / 6950iG are equipped
additionally with an electrolyte level monitor, ELM.
The electrolyte level monitor, ELM, automatically
sets the TTM to zero as soon as a critical electrolyte
level in the sensor tip is reached.
The alarm needs to be reset in the menu ”ISM setup”.
For oxygen sensors, the time to maintenance indi-
cates a maintenance cycle for the membrane and
electrolyte.
Note: The recommended initial value for the mainte-
nance interval will be uploaded from the sensor to
the transmitter and can be adapted according to the
application experience of the user.
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ACT Adaptive Cal Timer:
This timer estimates when the next calibration should
be performed to keep the best possible measurement
performance. The timer is influenced by significant
changes on the DLI parameters.
Note: The recommended initial value for the calibra-
tion interval will be uploaded from the sensor to the
transmitter and can be adapted according to the ap-
plication experience of the user.
3.4 Scope of delivery
Each sensor is supplied fully assembled and factory-
tested for correct function together with:
a quality control certificate
inspection certificates 3.1
(complying with EN 10204)
Digital sensors must be filled with electrolyte before
use.
See electrolyte order details at section „Spare Parts“,
9.3.
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3.5 Equipment features
12 mm sensor
METTLER TOLEDO ISM O2sensors are supplied with
fitted membrane body but without electrolyte
and covered with the protection cap and have been
checked for proper function.
Anode (Pt)
Cathode and Guard Ring
Protection Cap
Cap Sleeve (N-type)
O-ring (silicone FDA/USP VI)
Membrane Body
Retainer Nut
Reference (Ag/AgCl)
Interior Body
O-ring
(9.0 3 1.0 mm, silicone FDA/USP VI)
Pg 13.5 Threaded Sleeve
AK9 Connector
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4 Installation
4.1 Mounting the sensor
Important! Remove the protection 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.
4.2 Connection
4.2.1 Connecting the sensor to a AK9 cable
Note: The sensor is connected to the transmitter via
a AK9 cable. The AK9 cable ensures a secure con-
nection between the transmitter and the sensor under
harsh industrial conditions. The robust watertight
IP68 connector housing guarantees maximum
process safety.
Do not touch the sensor at the AK9 connector plug!
Tightly screw the plug to fasten the two parts.
Admissible mounting position
Zulässige Einbaulage
Positionement de montage admis
Inadmissible angle
Unzulässiger Winkel
Angle non admissible
52910094ME
15° 1
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4.2.2 Connecting the cable to the transmitter
Note: For connecting the AK9 or VP cable to the ter-
minals of the transmitter, please refer to the instruc-
tions given in the METTLER TOLEDO transmitter man-
ual.
AK9 Connector
Plug
AK9 Cable for
Standard Use
O2 Transmitter
AK9 Cable or VP
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5 Operation
Important! Before using the sensors for the first time,
the electrolyte must be filled in (see “Chapter 6.2”).
5.1 Start-up and polarizing
Important! The protection cap must be removed be-
fore mounting the sensor in the process.
When the system is operated for the first time or if the
sensor has been disconnected from the voltage
source (transmitter or O2Sensor Master) for longer
than 5 min utes, the sensor has to be polarized
prior to calibration by connecting it to the operating
O2transmitter or to a sensor master. After 6 hours,
the sensor is fully polarized and ready for
operation.
Attention: The InPro 6950iG should never be polar-
ized at air!
During Polarization, we suggest to use the protection
cap filled with cleaning and conditioning solution al-
ways (Chapter 7: Storage).
A shorter polarization period is sufficient 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.
Important! Setting of the polarization voltage on the
transmitter for correct measurements:
Standard applications InPro 6800 G / 6850i G:
675 mV
Measurement of permanently low oxygen concen-
trations (<500 ppb in liquids or <10,000 ppm
[vol.] in gases) in the presence of volatile acidic
Depolarization time1 Minimum required
tdepol [Min.] polarization time2 [Min.]
t
depol > 30 360
30 > tdepol > 15 6 3 tdepol
15 > tdepol > 5 4 3 tdepol
t
depol < 5 2 3 tdepol
1 Depolarization time: Time span in which the pola-
rization voltage is cut off from the sensor. This is
the case:
– during the time the cable is disconnected or no
transmitter or sensor master is connected
to the cable, or the transmitter has been
disconnected from the current supply.
– after changing the electrolyte or membrane
body. In this case at least 6 houres of polariza-
tion must follow.
2 Polarization time: Time span during which the
sensor is under a polarization voltage.
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components (e.g. carbon dioxide during measure-
ments in breweries) e.g. InPro 6900i G/6950 i G:
500 mV
Note: To ensure the supply of the correct polari za tion
voltage the transmitter must be set according to the
transmitter manual.
5.2 Calibration
5.2.1 Purpose of calibration
Each oxygen sensor has its own individual slope and
own individual zero point. Both values are subject
to change, for example, through electrolyte consump-
tion or after exchange of electrolyte or membrane
body. To ensure high measurement accuracy of
the sensor, a calibration must be carried out regular-
ly, but at least after each change of electrolyte or
membrane. Prior to calibration, the sensor has to be
polarized for at least 6 hours.
Important: Please remove the protection cap from
the sensor, rinse the sensor with water and dry it
wait at least 10 minutes before starting calibra-
tion. Store sensor upright with membrane pointing
down.
Note: To check if your sensor needs a recalibra-
tion, you may dry it and take it in the air to check
that the reading is close to 100%. If not, then the
sensor needs a new calibration.
With ISM sensors all calibration data are stored in the
sensor.
5.2.2 What you have to know for calibration
General remarks:
For calibration in gas (e.g. air), the sensor
membrane must be dry outside, since adhering
water drops can falsify the measured oxygen value.
Make sure that the oxygen saturation index of
the calibration medium is correct and remains
constant during calibration.
For correct calibration, a minimum flow rate of the
calibration medium is necessary.
Make sure that all other parameters, such as
temperature and pressure, are constant.
For continuous applications, we recommend periodic
recalibration in line with your requirements on
accuracy, the type of process in operation and
your own experience. The frequency of the need for
re calibration depends very much on the specific
application, and therefore appropriate intervals can-
not be exactly defined here.
20 InPro 6800 G/6850i G/6900i G/6950i GO
212 mm
InPro 6000 G – Series © 12 /15 Mettler-Toledo GmbH
52 206 477 Printed in Switzerland
5.2.3 Single point calibration
For applications measuring more than 1% Vol. O2
gas a single point calibration is recommended. In
this case the zero point is set manually to 0 nA. For
measuring below 1% Vol. O2a zero point calibration
with e.g. nitrogen gas is recommended.
By carrying out a single point calibration, the slope
or offset of the sensor can be set. The calibration
medium can be gas with known water-vapor satura-
tion (e.g. water-vapor saturated air).
After the sensor signal has stabilized, the complete
meas uring system can be calibrated to the100 %
value of the desired measurable variable, e.g.100 %
air, 20.95% O2, or 8.26 ppm at 25°C (77 °F) and
normal pressure (see instruction manual of the
transmitter).
Zero-point calibration is recommended for the InPro
6950iG only when measuring less than 125 ppm
(by vol. O2) in gases.
Attention! Incorrect zero point calibration is a
frequent source for measurement error. For correct
calibration, we recommend the use of carbon
dioxide gas with a level of purity of at least
99.9995 % for measurements in CO2 applications.
For all other applications we recommend to use ni-
trogen (N2) gas.
After the sensor signal has stabilized (after 6…12
hours), the sensor can be calibrated through the
transmitter to zero % value of the desired measurable
variable, e.g. 0 % air, 0.0% O2, or 0.0ppm (see in-
struction manual for the transmitter).
5.2.4 Dual point calibration
By carrying out a dual point calibration both slope
and zero point of the sensor can be set.
Important! In case of a dual point calibration,
always start with the zero point calibration before
calibrating the slope.
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Mettler Toledo InPro 6000G Series Manuel utilisateur

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Manuel utilisateur