Mettler Toledo Mettler InFit761e/InFit�761e Static Housings, Mettler InFit�764e Static Housing Manual

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Page 1

Instruction Manual

InFit 761e / InFit 764e

Immersion Housing

Page 2

2 InFit 761/ 4e Series

© It is forbidden to reprint this instruction manual in whole or part. No part of this manual may be reproduced in any form, or modified, copied or distributed using electronic systems, in particular in the form of photocopies, photographs, magnetic or other recordings, without written consent of Mettler-Toledo GmbH, Process Analytics, CH - 8902 Urdorf, Switzerland.

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

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InFit 761/ 4e Series 3

InFit 761e / InFit 764e Immersion Housing

Instruction Manual

InFit and InPro are trademarks of the METTLER TOLEDO Group. Viton® and Kalrez® are registered trademarks of DuPont Performance Elastomers LLC. All other trademarks are the property of their respective owners.

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4 InFit 761/ 4e Series

How to use this Instruction Manual

This Instruction Manual is an integral part of the METTLER TOLEDO insertion housing InFit® 761/ 4e Series and contains notes and instructions that are important for safety and operation.

All persons working on or with the InFit 761/ 4e must have first read and understood the sections appropriate to the work in hand.

Please read this Instruction Manual carefully before using the housing. Keep this document close to the unit, so that operating personnel may easily be able to refer to it at any time.

Caution! Please first read Section 1 “Introduction“ and Section 2 “Important Notes“.

Proprietary designations:

• InFit and InPro are trademarks of the METTLER TOLEDO Group.

• Viton® and Kalrez® are registered trademarks of DuPont Performance Elastomers LLC.

Use of warnings and symbols:

Danger! Warning of a dangerous situation that can lead to death or severe injury, or cause

extensive material damage.

Caution! Warning of a possibly dangerous situation that can lead to light bodily harm and / or material damage.

Attention: Information referring to technical requirements. Non-adherence can lead to malfunction, uneconomic working and possibly also to loss of productivity.

Explanation of housing designations:

The generic term InFit 761/ 4e Series used in this document refers to:

• InFit 761e – Insertion housing for pH / Redox electrodes with gel-type or polymer electrolyte, O

, CO2, conductivity and turbidity sensors (with 12 mm diameter and Pg 13.5 thread);

• InFit 764e – Insertion housing for pressurized pH / Redox electrodes with liquid electrolyte (such as InPro® 2000 (i)).

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

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InFit 761/ 4e Series 5

Page

How to use this Instruction Manual ....................................................................................... 4

1 Introduction ....................................................................................................................... 8

1.1 Declaration of Conformity / Type Examinations ............................................................... 8

1.2 Housing Designations ................................................................................................ 9

1.3 Basic Principles ....................................................................................................... 12

1.4 Responsibilities, Organizational Measures .................................................................. 12

1.4.1 Responsibilities of the Operator ..................................................................... 12

1.4.2 Responsibilities of the Personnel ................................................................... 13

1.4.3 Selection and Qualification of Personnel – Basic Duties .................................. 13

1.5 Product-Specific Hazards ......................................................................................... 13

1.5.1 Removal of Electrode / Sensor ........................................................................ 13

1.5.2 Manipulation and Maintenance Work on the Housings ..................................... 14

1.5.3 Plastic Housings ......................................................................................... 14

1.5.4 Installation in Pressurized Systems ................................................................ 14

1.5.5 Installation in Potentially Explosive Areas (Hazardous Areas) ........................... 15

1.6 Residual Hazards .................................................................................................... 16

1.6.1 Leaky Connections ...................................................................................... 16

1.6.2 Medium Residues ........................................................................................ 16

1.6.3 Heat Protection ........................................................................................... 16

1.6.4 External Impacts ......................................................................................... 16

1.7 Emergency Measures ............................................................................................... 16

1.8 Safety Measures ...................................................................................................... 16

1.9 Modifications .......................................................................................................... 17

2 Important Notes ................................................................................................................ 17

2.1 Notes on Operating Instructions ................................................................................. 17

2.2 Intended Use .......................................................................................................... 18

2.3 Safety Instructions .................................................................................................... 18

2.4 Correct Disposal of the Housing ................................................................................. 19

2.5 Use in Ex zones ....................................................................................................... 19

2.6 Ex classification ATEX / IECEx .................................................................................... 20

2.6.1 Introduction ................................................................................................ 20

2.6.2 Special Conditions ....................................................................................... 20

2.7 Ex classification FM Approved .................................................................................. 21

2.7.1 Introduction ................................................................................................ 22

2.7.2 Special Conditions ....................................................................................... 22

2.7.3 Applied Standards ....................................................................................... 23

2.8 Hygienic Instruction .................................................................................................. 23

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6 InFit 761/ 4e Series

Page

3 Product Description ......................................................................................................... 24

3.1 Scope of Delivery ..................................................................................................... 24

3.2 Packing .................................................................................................................. 24

3.3 Checking the Shipment ............................................................................................. 24

3.4 Product Overview ..................................................................................................... 25

3.5 Functional Description of the Housing ........................................................................ 30

4 Installation and Start-Up .................................................................................................... 31

4.1 Preparation of the Equipment ..................................................................................... 31

4.2 Fitting and Installation Work ...................................................................................... 32

4.2.1 Fitting the Housing ...................................................................................... 32

4.2.1.1 Fitting with a Weld-in Socket .......................................................... 33

4.2.1.2 Fitting with a Flange ...................................................................... 33

4.2.1.3 Fitting via NPT External Thread ....................................................... 33

4.2.1.4 Fitting with Tri-Clamp and Varivent Flange Connection ....................... 34

4.2.1.5 Installation with NPSM Thread ........................................................ 34

4.2.2 Fitting the Electrode / Sensor .......................................................................... 34

4.2.2.1 InFit 761e .................................................................................... 34

4.2.2.2 InFit 764e .................................................................................... 35

4.3 Startup Procedures for Housings ................................................................................ 37

4.4 Dismantling Work ................................................................................................... 38

4.4.1 Removing the Insertion Housing ................................................................... 38

4.4.2 Removing the Electrode / Sensor .................................................................... 38

4.5 Sterilization ............................................................................................................ 40

5 Operation ........................................................................................................................ 41

5.1 Important Information for Everyday Operation .............................................................. 41

5.2 Inspection Work in Everyday Operation ...................................................................... 41

5.3 Cleaning the Electrode / Sensor .................................................................................. 41

5.4 Calibrating the Measuring System .............................................................................. 42

6 Maintenance .................................................................................................................... 42

6.1 Important Information on Maintenance ........................................................................ 42

6.2 Topping up Reference Electrolyte ................................................................................ 43

6.3 Replacement of Medium-Wetted Seals ........................................................................ 43

7 Trouble Shooting .............................................................................................................. 45

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InFit 761/ 4e Series 7

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8 Product Specifications ....................................................................................................... 46

8.1 Technical Data ......................................................................................................... 46

8.1.1 Technical Specifications InFit 761e ................................................................ 46

8.1.2 Technical Specifications InFit 764e ................................................................ 48

8.2 Spare Parts and Accessories ..................................................................................... 49

9 Terms of Warranty ............................................................................................................ 53

10 Decommissioning, Storage, Disposal .................................................................................. 54

10.1 Decommissioning ................................................................................................... 54

10.1.1 Proceed as Described in Section 4.4 ”Dismantling Work”. ................................ 54

10.1.2 Repair ........................................................................................................ 54

10.2 Storage .................................................................................................................. 54

10.3 Disposal ................................................................................................................ 54

11 Appendices ...................................................................................................................... 55

11.1 Electrode / Sensor Selection ........................................................................................ 55

11.2 Product Key ............................................................................................................. 57

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8 InFit 761/ 4e Series

1 Introduction

• The insertion housing InFit 761/ 4e is safe to operate and has been tested by METTLER TOLEDO and dispatched ready for installation.

• Before starting to use the housing, carefully read this Instruction Manual: the safety precautions and warnings con tained in it must be observed.

In addition to this Instruction Manual please also note the following:

• All local safety regulations;

• All instructions and warning remarks in the publications of the products that are used in conjunction with the insertion housing (electrodes, sensors, etc.);

• All safety precautions for the plant into which the housing InFit 761/ 4e will be installed;

• All instructions and warnings labeled on the housing InFit 761/ 4e;

• All safety information relative to operation in potentially explosive atmosphere / ha zardous areas (Ex classified zones).

The Instruction Manual contains the most important information for using the InFit 761/ 4e housings efficiently and in accordance with regulations. A basic condition for safe handling and operation without malfunctions is the knowledge of these safety instructions and the observance of the further warnings in the Instruction Manual.

This Instruction Manual, and in particular the safety regulations, are intended for personnel entrusted with the operation and maintenance of the housings. It is assumed that these persons are familiar with the equipment in which the housing is installed. Therefore, before any work is started with the housing, this Instruction Manual must be read and understood by those persons involved.

The Instruction Manual must be stored where it is constantly accessible and available to any person working with the InFit 761/ 4e housing.

On receipt of the shipment, check immediately:

• The housing and accessories for any sign of transport damage. Report any damage immediately to the carrier and to your supplier;

• The type designation on the housing body;

• For completeness of the supply. Please notify your supplier immediately if the shipment is incomplete or in any way incorrect (see Section 3.1 “Scope of Delivery”).

1.1 Declaration of Conformity / Type Examinations

Attention: The “Declarations of Conformity and Type Examinations“ are dependent on the

design and the individual type of housing, and have no general validity for the complete InFit product range.

Declarations of conformity and certificates specific to particular products are included in housing delivery (when applicable).

1. Housings with CE marking with Notied Body according PED directives and according to

Exdirectives: medium-wetted parts made of metallic material > DN25.

2. Housings with CE marking with Notied Body according to EX directives: mediumwetted

parts made of metallic material > DN25.

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InFit 761/ 4e Series 9

3. Housings with CE marking without Notied Body according to PED directives (Module A,

Category I): medium-wetted parts made of plastic ≤ DN25.

4. Housings without CE marking: mediumwetted parts made of plastic ≤ DN25.

1.2 Housing Designations

Housing designations as well as part and serial numbers can be noted from the type plate and used for clear identification when communicating with the manufacturer.

Attention: The specifications shown on the type plate are dependent on the design and the individual type of housing and have no general validity for the complete InFit product range.

Example of InFit 761/ 4e label:

Note: The label shown only as an example. Depending on appropriate compliances (i.e. ATEX,

FM, PED or others), the final label may be different.

PartNo.: Part number SNR: Serial number PS: Permissible pressure TS: Permissible temperature

InFit 761/ 4e with ATEX / cFMus approval for use in Ex classified area.

InFit 761/ 4e housing for use in non ex classified area.

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1.3 Basic Principles

The insertion housing InFit 761/ 4e is built in accordance with state-of-the-art technology and recognized technical safety regulations.

However, the housing can be a source of risk and danger:

• If the housing is operated by insufficiently trained persons;

• If the housing is not used in compliance with regulations and / or stipulations for appropriate use.

InFit 761/ 4e housings must be used only in perfect technical condition and for the purpose intended by the manufacturer. It is assumed that the user is fully aware of safety / danger issues and respects the Instruction Manual and all local safety regulations.

Malfunction and damage that can affect safety and function of the housing must immediately be remedied by the operator or an expert, and notified to the manufacturer in writing!

Danger! Defective insertion housings must neither be installed nor put into operation. Leakage and inappropriate installation may lead to the escape of medium or to pressure surges (explosion), potentially harmful both to persons and to the environment.

1.4 Responsibilities, Organizational Measures

1.4.1 Responsibilities of the Operator

• The operator must restrict permission to work with InFit 761/ 4e insertion housings to persons who are familiar with the basic requirements of work safety and accident prevention, and who have been instructed in the handling of the housing. This Instruction Manual serves as the basic document;

• In addition to the Instruction Manual there are also generally applicable legal and other binding regulations for work safety and accident prevention as well as for environmental protection, and these must be provided by the operator and instructed to personnel using the housings;

• The operator / user must periodically check that the personnel is fully aware of regu lations on safety and risk prevention;

• Measures must be taken to ensure that the insertion housings are only operated in a safe and fully functional condition;

• If the housings are employed in hazardous areas, compliance with prevailing regu lations must be ensured.

Caution! Before the insertion housing is put into operation, the operator has to make sure that use of the housing in conjunction with the other associated equipment and resources is fully authorized.

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1.4.2 Responsibilities of the Personnel

• All persons operating the insertion housings must have read Sections 1 “Introduction” and 2 “Important Notes” as well as the warning notices in this Instruction Manual;

• In addition to the Instruction Manual, generally applicable legal and other binding regulations for work safety and accident prevention must be adhered to;

• Avoid any kind of working that is doubtful from a safety perspective or which exceeds the admissible scope of use;

• Do not use high-pressure cleaning equipment for polymer / plastic components of the housing.

Attention: Before every start-up, the insertion housing must be checked for:

• Damage to the connections, fastenings, etc.;

• Leakage;

• Proper functioning;

• Authorization for use in conjunction with other plant equipment and resources.

1.4.3 Selection and Qualication of Personnel – Basic Duties

• Work on or with the insertion housings may only be carried out by authorized and appropriately trained or instructed per sonnel. The personnel must have read this Instruction Manual in advance;

• Clear responsibilities must be established for the personnel entrusted with operation, service, repair, etc. of the housings;

• It must be ensured that only specifically assigned personnel may operate the housings.

Danger! Incorrect manipulation or operation of the housings or non-observance of safety regulations can lead to malfunction of the housing and to the escape of process medium, thus presenting a potential hazard to the environment, personnel and material.

1.5 Product-Specic Hazards

1.5.1 Removal of Electrode / Sensor

Danger! The electrode or sensor must be removed only after the piping / vessel has been

depressurized and emptied. Otherwise, the removed electrode / sensor may cause the process medium to escape thus presenting a severe danger to persons, material and the environment. Any toxic or aggressive medium may cause severe poisoning or causticization.

Note: Any broken sensor or defective / cut O-ring must be replaced without delay.

Danger! Broken sensors prevent accurate measurings and thus adversely affect process

safety.

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14 InFit 761/ 4e Series

1.5.2 Manipulation and Maintenance Work on the Housings

Attention: Before dismantling an insertion housing or commencing any maintenance work on it,

ensure that the equipment in which the insertion housing is installed is in a safe condition (depressurized, explosion-proof, emptied, rinsed, vented, etc.). Insertion housings may only be stripped down after having been completely dismounted.

Manipulation of the sensor and the housing may only take place after it is has been ensured that no process medium can escape through the housing in the event of incorrect manipulation. For this reason, the complete system must be emptied and vented in advance (safe condition).

It is mandatory to wear personal protective outfit such as protective goggles and clothing.

Only maintenance and repair work specified in this Instruction Manual may be performed on the insertion housing.

Exclusively use genuine spare parts from METTLER TOLEDO when replacing defective components (see Section 8.2 “Spare Parts and Accessories”).

Danger! Non-compliance with the prescribed maintenance instructions may endanger personnel and the environment.

1.5.3 Plastic Housings

Attention:

• Insertion housings made of plastic do not have the same mechanical resistance as steel housings;

• Insertion housings made of plastic require more frequent servicing than steel housings;

• Defective components may be replaced by an authorized service center only.

Danger! Plastic housings may not be used in applications subject to high mechanical stress as this could break the protective cage.

1.5.4 Installation in Pressurized Systems

Attention: The specified maximum tempera ture and pressure must not be exceeded. The

respective specifications depend on the design and type of housing and are given on the individual type plates.

Danger! If temperature and pressure limits are exceeded, there is a risk to the integrity of the system, thus presenting a potential threat to human life and to the environment.

Attention: Ample specifications of maximum admissible temperature and pressure are given in Section 8.

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

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InFit 761/ 4e Series 15

1.5.5 Installation in Potentially Explosive Areas (Hazardous Areas)

Attention:

• It should be considered to include the METTLER TOLEDO insertion housing InFit 761/ 4e and the process connections in your recurring pressure test program for the complete plant as a whole;

• The operator must ensure that the housing can be used safely in conjunction with other associated plant resources;

• The insertion housing and the process connections must be connected to the main potential equalization system of the plant (see drawing below).

Erdung / Grounding /

Mise à terre

Connection of the housing to the potential equalization system of the plant.

A. Installation from top InFit 761/ NY / * / * / P01/ * / 2- B. Installation from top InFit 761/ NY / * / * / P02 / * / -- C. Lateral installation InFit 761/ WS / * / * / D00 / * / 9- D. Installation in piping InFit 761/ NS / * / * / D00 / * / 9-

Danger! Non-observance of legal regulations concerning use in hazardous areas can endanger

human life and the environment.

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16 InFit 761/ 4e Series

1.6 Residual Hazards

Attention: Despite all precautionary measures taken, residual hazards still remain.

1.6.1 Leaky Connections

• Connections can become loose through the effects of vibration;

• The connection between housing and process adaptor is a potential source of leakage.

Attention: The connections between the housing and the process adaptor must be checked regularly by the customer / operator, and kept in full working condition.

Danger! Leaky connections can cause the process medium to escape to the environment, presenting a hazard for persons and the environment.

1.6.2 Medium Residues

Danger! When retracting / replacing an electrode/ sensor, small quantities of process me dium will

remain at the electrode / sensor. If the medium is a toxic or environmentally harm ful substance, or contains pathogenic germs, then such contamination must be removed and disposed of in accordance with the applicable regulations!

1.6.3 Heat Protection

Danger! The housing is not equipped with heat protection. During steam-sterilization procedure,

the surface of the housing can reach high temperatures and cause burns.

1.6.4 External Impacts

Attention: Objects falling on the housing can damage or destroy the unit, or cause leaks etc.

1.7 Emergency Measures

Attention: Always observe and comply with local regulations!

1.8 Safety Measures

Attention: Always observe and comply with local laws and regulations! These are not an

integral part of this Instruction Manual.

Danger! It is mandatory to wear protective equipment such as protective goggles and protective clothing. Aggressive process medium escaping from the system may be hazardous to persons or the environment.

Attention: The operator is responsible for the instruction of personnel. Additional copies of this Instruction Manual can be ordered from the equipment supplier. As an integral part of the insertion housing, this Instruction Manual must at all times be readily accessible to users at the point of operation of the housing.

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InFit 761/ 4e Series 17

The operator must inform the supplier / manufacturer of the insertion housing immediately about any safety-relevant incidents, or observations made, during use of the housing.

Danger! Incorrect manipulation and / or instruc tion errors can lead to potential hazards for persons and for the environment.

Attention: Before every start-up, the insertion housing must be checked for:

• Damage to the connections, fastenings, etc.;

• Leakage;

• Defective cables and lines etc.;

• Authorization for use of the housing in conjunction with the associated plant resources.

Danger! Defective insertion housings must neither be installed nor put into operation. Leakage and inappropriate installation may lead to the escape of medium and cause a potential threat to life (including the risk of explosion).

1.9 Modications

Attention: No attachments or modifications to the insertion housings are allowed.

Danger! The manufacturer / supplier accepts no responsibility for any damage caused by

unauthorized attachments and alterations or for the incorporation of spare parts which are not of METTLER TOLEDO provenance. The risk is borne entirely by the operator.

2 Important Notes

2.1 Notes on Operating Instructions

These operating instructions contain all the information needed for safe and proper use of the housing.

The operating instructions are intended for personnel entrusted with the operation and maintenance of sensors and housings. It is assumed that these persons are familiar with the equipment in which the sensors and housings are 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 neglected, 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.

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18 InFit 761/ 4e Series

2.2 Intended Use

The insertion housings InFit 761/ 4e are intended solely for measurement tasks in conjunction with the specified METTLER TOLEDO electrodes / sensors, namely pH and redox (ORP) combination electrodes as well as oxygen, CO2, conductivity or turbidity sensors. Use the housings only for this purpose.

Housings with the or symbol on the type plate have received approval for operation in potentially explosive / hazardous areas.

Any use of these housings which differs from or exceeds the scope of use described in this instruction manual will be regarded as inappropriate and incompatible 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;

• Correct maintenance of the housings;

• Acceptance of responsibility for regular inspection, maintenance and functional testing of all associated components, also including compliance with local operational and plant safety regulations;

• Operation in compliance with prevailing regulations concerning the environmental and operating conditions as well as with the admissible mounting positions;

• Compliance with all information and warnings given in the documentation relating to the products used in conjunction with the housings;

• Correct equipment operation in conformance with the prescribed environmental and operational conditions, and admissible installation positions;

• Consultation with METTLER TOLEDO Process Analytics in the event of any uncertainties.

Danger! The housing must be operated only with the specified electrodes / sensors. The absence or the installation of an inappropriate electrode / sensor may adversely affect the resistance to pressure and temperature, the chemical resistance and the protection against explosion. Consequently, there can be leakage from the housing and / or risk of explosion that may endanger persons and the environment.

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 housings or of any of the associated equipment (e.g. sensors, 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 housings and associated components have no effect on the process itself and cannot influence it in the sense of any form of control system.

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InFit 761/ 4e Series 19

• Maintenance and service intervals and schedules depend on the application conditions, composition of the sample media, plant equipment and significance 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 housing must neither be installed nor put into service.

• Only maintenance work described in these operating instructions may be performed on the housings.

• When changing faulty components, use only original spare parts obtainable from your METTLER TOLEDO supplier (see spare parts list, Section 8.2).

• No modifications to the housings and the accessories are allowed. The manufacturer accepts no responsibility for damage caused by unauthorized modifications. The risk is borne entirely by the user.

• Care must be taken during installation to avoid impacts or friction that could create an ignition source.

• Tampering and replacement with non-factory components 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 flammable vapors.

• W arning!

Intrinsically safe apparatus can be a source of ignition if internal spacings are shorted or connections opened.

• W arning!

Do not open when an explosive atmosphere is present.

• W arning!

Substitution of components may impair intrinsic safety.

• W arning!

Substitution of components may impair suitability of the equipment

• W arning!

For connection only to non-flammable processes.

2.4 Correct Disposal of the Housing

When the housing is finally removed from service, observe all local environmental regulations for proper disposal.

2.5 Use in Ex zones

Attention! For an installation in Ex zones please read the guidelines following hereafter:

1258

Ex classification ATEX / IECEx:

II 1/ 2G Ex h IIC T6 … T3 Ga/Gb

II 1/ 2D Ex h IIIC T69 °C … T141 °C Da/Db

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20 InFit 761/ 4e Series

Number of the test certificate:

SEV 13 ATEX 0161X IECEx SEV 19.0014X

Ex classification FM approved:

IS/I,II,III/1/ ABCDEFG/ T6 Ta = 60 ºC

– 53 800 002; Entity

Project ID: 3021227 FM certificate number: FM16US0034X

FM18CA0021X

2.6 Ex classication ATEX / IECEx

2.6.1 Introduction

According to RL 2014/34/EU (ATEX114) Appendix l, InFit 7XX/*1/*2/*3/*4/*5/*6*7*8 housings are devices group ll, category 1/ 2G and according to RL 99/92/EG (ATEX 137) may be used in zones 0 /1 or 0/2 and gas group IIC that are potentially explosive due to combustible substances in the temperatures classes T3 to T6.

For use / installation, the requirements of EN 60079-14 must be observed.

According to RL 2014/34/EU (ATEX114) Appendix l, InFit 7XX/*1/*2/*3/*4/*5/*6*7*8 housings are devices group Ill, category 1/ 2D and according to RL 99/92/EG (ATEX 137) may also be used in zones 20/21 resp. 20/22 that contain combustible dusts.

For use/installation, the requirements of EN 60079-14 must be observed.

2.6.2 Special Conditions

1. The housings with pneumatic actuation position of the sensors with electrical feedback signal may be operated in hazardous areas Zone 1 and Zone 2 or Zone 21 and Zone 22 with

separately certied intrinsically safe inductive proximity switches e.g. Pepperl + Fuchs types NCB2 ***– if the gas groups and temperature classes coincide with the used ammable substances and the special conditions of the Certicates are observed.

2. The maximum permissible ambient or process temperatures for Zone 0 (ammable gases or ammable liquids) shall be taken according to the following table:

Temperature class Max. environment resp. media temp.

T6 68 °C (154.4 °F)

T5 80 °C (176 °F)

T4 108 °C (226.4 °F )

T3 140 °C (284 °F)

The maximum permissible ambient or process temperatures must not exceed the aforementioned values and they will be found in this instruction manual Section 8.

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InFit 761/ 4e Series 21

3. The maximum permissible surface temperature for Zone 20 (combustible dust) shall be taken accordingly to the following table:

Temperature class Max. environment resp. media temp.

T 69 °C 68 °C (154.4 °F)

T 81 °C 80 °C (176 °F)

T 109 °C 108 °C (226.4 °F )

T 141 °C 140 °C (284 °F )

The maximum permissible ambient or process temperatures must not exceed the aforementioned values and they will be found in this instruction manual Section 8.

4. The metallic body of the housing type InFit 761/ 4e*/1/*2/*3/*4/*5/*6/*7/*8 has to be connected conductively to the equipotential system of the plant.

5. The housings type InFit 761/ 4e*/1/*2/*3/*4/*5/*6/*7/*8 are included in the periodic pressure testing of the system, where appropriate.

6. W arning! Potential electrostatic charging hazard – by installation, use and maintenance work, see instruction manual.

7. The housings made of titanium must be installed adequately protected against impact and friction sparks.

2.7 Ex classication FM Approved

IS/I,II,III/1/ABCDEFG/T6 Ta = 60 ºC

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22 InFit 761/ 4e Series

2.7.1 Introduction

The following FM control drawing and the standards listed in Section 2.7.3 must be observed, where applicable:

2.7.2 Special Conditions

See Section 2.6.2.

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2.7.3 Applied Standards

United States Standards

Title Number Issue Date

Approval Standard for Electrical Equipment for

Use in Hazardous (Classied) Locations –

General Requirements.

Approval Standard for Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II & III,

Division 1, Hazardous (Classied) Locations.

Approval Standard for Electrical Equipment for Measurement, Control and Laboratory Use.

Explosive Atmospheres – Part 0: Equipment – General Requirements.

Explosive Atmospheres – Part 11: Equipment Protection by Intrinsic Safety ”i”.

Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements.

Canadian Standards

Title Number Issue Date

Explosive Atmospheres – Part 0: Equipment – General Requirements.

Explosive Atmospheres – Part 11: Equipment Protection by Intrinsic Safety ”i”.

Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements.

FM Class 3600 2011

FM Class 3610 2015

FM Class 3810 2005

ANSI/ISA-60079-0 (12.00.01) 2005

ANSI/ISA-60079-11 (12.02.01) 2009

ANSI/ISA-61010-1 (82.02.01) 2004

FM Class 3600 CAN/CSA-C22.2 No. 60079-0

CAN/CSA-C22.2 No. 60079-11

CAN/CSA-C22.2 No. 61010 -1

2015

2014

2015

2.8 Hygienic Instruction

For the operation according EHEDG, please follow the instructions:

1. Use of instruments according EHEDG

The use of components with the EHEDG logo provides proof that the configuration was tested. The certificate always refers to a combination of sensor and process fitting.

2. Mounting

All parts of the measuring point must be certified according to EHEDG.

3. Installation position

The sensor has to be mounted that self-drainage of the sensor resp. housing is possible. If the sensor is mounted in a different position, the user must ensure the self-drainage of the sensor through suitable measures.

4. Socket

The height of the socket (h) can be at most twice as large as the difference between the sensor and the pipe inner diameter (D) The following formula is applicable:

h ≤ (D-d).

H Permissible socket height (sealing surface to tube inner diameter) D Socket inner diameter D Sensor diameter

Page 22

24 InFit 761/ 4e Series

3 Product Description

3.1 Scope of Delivery

Standard supply of the insertion housing is made up of the following:

Housing InFit 761e

• Protective sleeve with antikink protection;

• Cable grommet (for 5 mm or 7 mm cable);

• An instruction manual and a quick setup guide;

• Certificates depending on specifications.

Housing InFit 764e

• Protective sleeve with antikink protection;

• Manual air pump;

• Electrolyte recharge syringe;

• Pressure connection set;

• Cable grommet (for 5 mm or 7 mm cable);

• An instruction manual and a quick setup guide;

• Certificates depending on specifications.

3.2 Packing

The packing consists of cardboard with protective paddings.

Keep the packing for possible later use, such as for storage or transport of the housing. However, if you wish to dispose of the packing, please observe your local regulations on waste disposal.

Attention: Also see Section 10.3 “Disposal”.

3.3 Checking the Shipment

When unpacking the shipment, carefully examine for signs of damage. Any damage must be reported to the carrier and your supplier without delay. Check that the shipment meets the delivery papers and your order.

Attention: Damaged housings must not be installed or put into operation (see Section 2).

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 23

InFit 761/ 4e Series 25

52 900 277ME (150% vergrössert)

InFit 761/WS/*/*/D10/*2-

InFit 761/NY/*/*/P01/*2-

InFit 761/WY/*/*/P01/*2- InFit 761/NY/*/*/P02/*-- InFit 761/WY/*/*/P02/*--

G 11/4"

M26x1 M26x1

O-Ring

20.29 x 2.62

O-Ring

15.60 x 1.78

O-Ring

15.60 x 1.78

0.748

0.984

2.362

199

7.834

193

7.598

193

7.598

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

0.236

22.4

0.882

22.4

0.882

22.4

0.882

InFit 761/NY/*/*/P01/*2-

InFit 761/WY/*/*/P01/*2- InFit 761/NY/*/*/P02/*-- InFit 761/WY/*/*/P02/*--

M26x1 M26x1

O-Ring

15.60 x 1.78

O-Ring

15.60 x 1.78

3/4" R/NPSM 3/4" R/NPSM

0.748

2.362

193

7.598

193

7.598

193

7.598

a=H+50

a=H+1.968

22.4

0.882

22.4

0.882

3.4 Product Overview

The insertion housings are available in different versions, based on the “Product Key” on page 57):

H = Immersion length, a = Sensor length

InFit 761/WS/*/*/D00/*9-

InFit 761/NS/*/*/D00/*9-

oder / or / ou

InFit 761/WS/*/*/D11/*9-

199

G 11/4"

a=H+50

a=H+1.968

0.984

O-Ring

20.29 x 2.62

1.141

0.236

InFit 761/NS/*/*/D11/*9-

2.362

7.834

a=H+50

oder / or / ou

G 11/4"

a=H+1.968

0.984

O-Ring

20.29 x 2.62

InFit 761/WS/*/*/D10/*2-

22.4

199

0.882

0.236

2.362

7.834

2.362

199

7.834

G 11/4"

a=H+50

1.141

H-6

H-0.236

0.944

a=H+1.968

0.984

O-Ring

20.29 x 2.62

Dim. mm (app.) inch

Page 24

26 InFit 761/ 4e Series

InFit 761/NY/*/*/P02/*-- InFit 761/WY/*/*/P02/*--

InFit 761/NY/*/*/N04/*--

oder / or / ou

InFit 761/NY/*/*/N01/*--

InFit 761/WY/*/*/N04/*--

oder / or / ou

InFit 761/WY/*/*/N01/*--

3/4" R/NPSM 3/4" R/NPSM

3/4" NPT oder 1" NPT

0.748

2.362

193

7.598

193

7.598

193

7.598

193

7.598

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

0.866

3/4" NPT oder 1" NPT

InFit 761/WY/*/*/P01/*2- InFit 761/NY/*/*/P02/*-- InFit 761/WY/*/*/P02/*--

InFit 761/NY/*/*/N04/*--

oder / or / ou

InFit 761/NY/*/*/N01/*--

InFit 761/WY/*/*/N04/*--

oder / or / ou

InFit 761/WY/*/*/N01/*--

M26x1

O-Ring

15.60 x 1.78

3/4" R/NPSM 3/4" R/NPSM

3/4" NPT oder 1" NPT

0.748

2.362

193

7.598

193

7.598

193

7.598

193

7.598

193

7.598

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

0.866

22.4

0.882

3/4" NPT oder 1" NPT

H = Immersion length, a = Sensor length

InFit 761/NY/*/*/P01/*2-

M26x1 M26x1

0.748

a=H+50

a=H+1.968

22.4

O-Ring

15.60 x 1.78

0.882

InFit 761/WY/*/*/P01/*2-

2.362

193

7.598

a=H+50

0.748

a=H+1.968

2.362

193

7.598

22.4

O-Ring

15.60 x 1.78

0.882

0.866

* For housings with immersion length H=70 and without protective cage

1.181

0.866

0.236

InFit 761/NY/*/*/P01/*2-

2.362

a=H+50

M26x1

0.748

a=H+1.968

22.4

O-Ring

15.60 x 1.78

193

7.598

0.882

Dim. mm (app.) inch

0.866

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 25

InFit 761/ 4e Series 27

InFit 761/WY/*/*/N04/*--

oder / or / ou

InFit 761/WY/*/*/N01/*--

0.748

2.362

193

7.598

a=H+50

a=H+1.968

0.236

0.866

3/4" NPT oder 1" NPT

H = Immersion length, a = Sensor length

InFit 761/NY/*/*/N04/*--

InFit 761/WY/*/*/P02/*--

oder / or / ou

InFit 761/NY/*/*/N01/*--

a=H+50

a=H+1.968

3/4" R/NPSM

0.748

0.866

193

2.362

7.598

a=H+50

a=H+1.968

0.748

3/4" NPT oder 1" NPT

0.866

193

2.362

7.598

InFit 761/WY/*/*/N04/*--

oder / or / ou

InFit 761/WY/*/*/N01/*--

3/4" NPT oder 1" NPT

a=H+50

a=H+1.968

0.748

0.236

2.362

193

7.598

0.866

0.236

Dim. mm (app.) inch

Page 26

28 InFit 761/ 4e Series

52 900 279ME_1_A (unverändert)

InFit761/NS/*/PVDF/D00/*9-

InFit761/WK/0040/*/N04/*--

3/4" NPT

0.905

231

9.094

H=ca. 40

H=approx. 2

2.362

InFit761/WK/0040/*/N04/*-

InFit 761/NC/*/*/D00/*9- InFit 761/NC/0033/*/V02/*--

O-Ring

20.29 x 2.62

a=4.724

a=120

a=4.724

2.362

3.307

1.299

2.047

202

7.952

H = Immersion length, a = Sensor length

oder / or / ou

InFit761/NS/*/PP/D00/*9-

2.362

231

9.094

3/4" NPT

H=ca. 40

H=approx. 2

a=H+50

a=H+1.968

O-Ring

20.29 x 2.62

0.984

2.362

199

7.834

G 1 1/4"

1.141

H-6

H-0.236

H = Immersion length, a = Sensor length

0.905

0.236

Dim. mm (app.) inch

InFit 761/NC/0025/*/V01/*--

60238

2.362

143

5.630

G 1 1/4"

0.984

a=H+50

a=H+1.968

1.141

H-5

H-0.196

0.984

InFit 761/NC/0033/*/V02/*--

2.362

7.952

202

3.307

a=120

68 84

a=120

a=4.724

1.299

2.047 52

Dim. mm (app.) inch

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 27

InFit 761/ 4e Series 29

InFit 761/NC/*/*/D00/*9- InFit 761/NC/0033/*/V02/*--InFit 761/NC/0025/*/V01/*--

InFit 761/NC/0033/*/T03/*--

G 1 1/4"

0.984

O-Ring

20.29 x 2.62

a=120

a=4.724

1.141

0.984

H-5

H-0.196

a=H+50

a=H+1.968

a=H+50

a=H+1.968

a=H+50

a=H+1.968

2.362

220

8.661

1.299

12.5

0.492

3.307

1 1/2"

1.299

2.047

202

7.952

143

5.630

60238

2.362

3.307

1.299

2.047

202

7.952

InFit764/NS/*/*/D11/*4-

oder / or / ou

InFit764/NS/*/*/D00/*4-

InFit764/WS/*/*/D11/*4-

oder / or / ou

InFit764/WS/*/*/D00/*4-

2.677

0.984

2.677

a=H+50

a=H+1.968

O-Ring

20.29 x 2.62

G11/4" G11/4"

O-Ring

20.29 x 2.62

O-Ring

20.29 x 2.62

G11/4"

a=H+50

a=H+1.968

a=H+50

a=H+1.968

24.5

1.141

0.944

345.5

13.602

345.5

13.602

345.5

13.602

2.362

1.023

0.197

InFit764/NC/*/*/D00/*9-

H = Immersion length, a = Sensor length

InFit 761/NC/*/*/T02/*-- InFit 761/NC/*/*/T01/*--

2.362

198

7.795

0.984

H-5

H-0.197

a=H+50

a=H+1.968

2.362

198

7.795

1 1/2"

0.984

H-5

H-0.197

0.984

H = Immersion length, a = Sensor length

InFit 761/NC/0033/*/T03/*--

a=H+50

a=H+1.968

1 1/2"

2.362

0.944

8.661

0.492

220

a=120

a=4.724

1.299 33

12.5

Dim. mm (app.) inch

Form / shape / forme A

Optionaler Schutzkorb Optional protective cage Cage de protection optionelle

24.5

H>=70

Pas de cage de protection

• Aufsteckbarer Schutzkorb; nur erhältlich für den unteren Teil Form B mit der Längen >=100mm

• Plug-type protective cage; available only for lower probes shape B with lengths >=100mm

• Cage de protection enfichable; seulement disponible pour les formes B avec longueurs >=100mm

H>=2.755

Kein Schutzkorb

No protective cage

Form / shape / forme B

24.5

H>=100

H>=3.937

Different shapes for the lower part of the immersion tube.

Dim. mm (app.) inch

Page 28

30 InFit 761/ 4e Series

Optionaler Schutzkorb Optional protective cage Cage de protection optionelle

Form / shape / forme A

Form / shape / forme B

Kein Schutzkorb

No protective cage

Pas de cage de protection

• Aufsteckbarer Schutzkorb; nur erhältlich für den unteren Teil Form B mit der Längen >=100mm

• Plug-type protective cage; available only for lower probes shape B with lengths >=100mm

• Cage de protection enfichable; seulement disponible pour les formes B avec longueurs >=100mm

H>=70

H>=2.755

H>=100

H>=3.937

24.5

H = Immersion length, a = Sensor length

InFit764/NC/*/*/D00/*9-

2.362

Form / shape / forme C

24.5

345.5

2.677

13.602

Korb Cage Cage

Form / shape / forme D Form / shape / forme E

H>=70

H>=2.755

a=H+50

a=H+1.968

G11/4"

0.984

O-Ring

20.29 x 2.62

1.141

0.944

Aufsteckbarer Schutzkorb; nicht erhältlich für die PVDF-Versionen

Plug-type protective cage; not available for PVDF types

Cage de protection enfichable; ne pas disponible pour les types PVDF

Different shapes for the lower part of the immersion tube.

3.5 Functional Description of the Housing

The housings act as a support for electrodes and sensors used in various industries for measuring pH, Redox, dissolved oxygen, CO2, turbidity and conductivity.

All housings made of steel are suitable for ”In Situ“ sterilization and may be mounted diagonally or vertically into reactors and pipings. For sterility reasons the InFit 761/ 4e with type ”C” sensor holder employs an optimally positioned O-ring to minimize the gap between the wet part of the housing and the socket. These versions are especially designed for advanced hygienic requirements.

For CIP cleaning InFit 761/ 4e versions are suitable. For autoclaving only InFit 761e versions are suitable. In both cases, only with sensorholder type ”C” (see “Product Key” on page 57). Insertion housings protect the electrodes/sensors from mechanical damage. The (black) antistatic protection sleeve protects the plug-type connector (allowing easy replacement of electrodes/ sensors) from humidity and mechanical damage. The plug-type electrodes facilitate electrode interchange and the electrode cable can be used repeatedly. Furthermore, most versions (except the InFit 761/ 4e with type ”C” sensor holder always without protective cage) are available with or without protective cage for electrode/sensor tip. The housings with type ”Y” sensor holder are designed for vertical installation.

24.5

Dim. mm (app.) inch

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 29

InFit 761/ 4e Series 31

Note: Housings suitable for operation in hazardous areas carry a respective or symbol on their type plate. Housings that do not carry this additional marking are not admissible for use in hazardous areas.

All medium wetted parts of the housing are available in stainless steel according to DIN

1.4435/316L, DIN 2.4602/Alloy C22 or titanium, or made of PVDF and PP plastics. The head (top piece) is made of antistatic PP and nickel-plated brass. The O-ring seals between the housing and the medium are made of Viton® (FKM), Kalrez® (FFKM), silicone (MVQ) or EPDM.

4 Installation and Start-Up

4.1 Preparation of the Equipment

The insertion housings are mounted and fixed on a vessel (reactor, tank, pipe, etc.) either by means of a cap nut in conjunction with a weld-in socket, by a flange connection, by a Tri-Clamp or Varivent adaption or via an external NPT thread.

Attention: Attachment of the weld-in socket, flange connection or Tri-Clamp or Varivent adaption or threaded bushing is the responsibility of the customer.

Attention: Weld-in sockets or safety weld-in sockets G 1¼" (inner Ø = 25 mm, straight or 15° inclined) made of various material are available from your supplier.

Danger! Our welding instructions (included in the supply of the original METTLER TOLEDO socket) for the weld-in socket must be fully complied with, as otherwise the process connection can be untight (leak) or the pressure resistance insufficient.

Caution! After welding, the bore of the weld-in socket is to be checked and if necessary reamed to the dimension 25-H7.

In order to ensure correct function of the in sertion housing, please observe the following installation instructions:

• The insertion housing can be mounted vertically or in an inclined position. In the case of inclined mounting, the angle of the housing must be equal to or greater than 15° above the horizontal.

Caution! Installation outside the admissible range of mounting positions is not allowed, otherwise correct operation of the electrodes / sensors may be impaired.

Page 30

32 InFit 761/ 4e Series

52910536

Admissible mounting position.

admissible mounting position

zulässige Einbaulage

positionement de montage admis

inadmissible (except for InPro 3100 UD)

unzulässig (ausser für InPro 3100 UD)

ne pas admissible (sauf pour l’InPro 3100 UD)

Installation options.

• The insertion housing is to be mounted in such a position that there is always enough clearance available for its correct functioning (correct measuring position in the process medium) as well as for mainte nance work (checks, fitting and removal of the electrodes/sensors or the housing). The respective dimensions can be found in the drawings in the appendix to this Instruction Manual, or in the specifications.

• Installation of the insertion housing in exposed positions should be avoided. If this is not possible, appropriate protective measures against damage or interference must be taken.

4.2 Fitting and Installation Work

Caution! For all installation work described below, make sure the equipment in which the

housing is to be installed is in a safe con dition (depressurized, emptied, rinsed, vented, etc.).

4.2.1 Fitting the Housing

Caution! Never place the housing on the front end of the centering spigot or on the immer sion

tube (risk of damage e.g. damage of the N5 surface). Make sure the housing is fitted to the designated, appro priate socket or flange as directed (see Section 3.5).

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 31

InFit 761/ 4e Series 33

4.2.1.1 Fitting with a Weld-in Socket

1. Clean the centering spigot of the insertion housing and the bore of the weld-in socket (25-H7) and check for damage.

Caution! Fitting of the insertion housing with a damaged spigot or into a damaged weld-in socket is not allowed and can present a hazard to persons and / or lead to material damage.

Caution! Make sure there are no obstacles in the insertion path that could hamper the motion of the immersion tube or damage the sensor / housing.

2. Check the O-ring on the spigot for dama ge and replace it if necessary. Sightly grease the O-ring. Ensure appropriate quality and positioning of the O-ring.

3. Position the housing on the weld-in socket and carefully insert the spigot into the bo re.

4. Finally, tighten the cap nut until the connection is completely sealed.

Caution! Checking the sealing / tightness of the process adaptor is the responsibility of the operator who must also guarantee same by adopting appropriate measures. Additional safety provisions are required if the connection is subject to stress caused by vibrations.

4.2.1.2 Fitting with a Flange

1. Clean the sealing surfaces of the ange (housing and ange connection on vessel) and check for damage.

Caution! If the process media / reaction products are considered to be dangerous, it is imperative that an embedded seal is used at the flange interface and / or a splash guard is mounted. Fitting of the insertion housing with damaged flange connections is not allowed and can present a hazard to persons and / or lead to material damage.

2. Use the appropriate ange gasket and check for damage. Replace if necessary.

Attention in the case of housings made of special alloy: Check that the seal is present on the flange of the insertion housing and that it is not damaged. Re place if necessary. Ensure correct quality and positioning of the seal.

3. Position the housing on the ange connection, align, and tighten evenly crosswise using the prescribed number of bolts and nuts.

4.2.1.3 Fitting via NPT External Thread

1. Wind PTFE tape around the external male thread.

2. Screw the housing carefully into the female socket.

3. Check the Installation for leaks.

Page 32

34 InFit 761/ 4e Series

4.2.1.4 Fitting with Tri-Clamp and Varivent Flange Connection

1. Clean the sealing surfaces of the ange (housing and ange connection on vessel) and check for damage.

Caution! Make sure there are no obstacles in the insertion path that could hamper the motion of the immersion tube or damage the sensor / housing.

2. Use the appropriate ange gasket and check for damage. Replace if necessary.

3. Position the housing on the ange connection, align, then thoroughly tighten the clamp fastener.

4.2.1.5 Installation with NPSM Thread

1. Carefully screw in the housing from the top.

2. First tighten by hand, then securely tighten with fork wrench (36 mm size).

3. Check the installation for leaks.

4.2.2 Fitting the Electrode / Sensor

4.2.2.1 InFit 761e

Caution! Damaged electrodes / sensors must never be installed.

Attention: To ensure tightness of the housing it is mandatory to use the antikink cable gland ”A”.

In this case, lead the cable from the bottom through the antikink cable gland ”A” before connecting it to the transmitter.

Attention: If the cable is already in place and the antikink cable gland ”A” is not required you may lead the cable from the top through the protective sleeve ”C”. In this case, the supplied slotted cable grommet ”F” (5 or 7 mm) must be used. However, in this scenario the tightness of the housing is not ensured.

1. Make sure the white PTFE sliding disk ”D” is located directly below the electrode / sensor head, with the chamfered part facing the bottom, followed by the O-ring ”E”.

2. Check sliding disk and O-ring for damage and replace, as required.

3. Remove watering cap from the electrode / sensor tip and rinse electrode/sensor tip (membrane) with water.

4. Carefully insert the electrode / sensor into the tube and screw in by hand to the stop.

5. Push cable with connector ”B” through protective sleeve ”C” .

6. Screw connector ”B” to pH/Redox electrode or O2 sensor. Tighten protective sleeve ”C” on housing by hand.

7. Tighten antikink cable gland ”A” or mount slotted cable grommet ”F” to cable and push into protective sleeve ”C”.

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 33

InFit 761/ 4e Series 35

D E

Fitting of electrode / sensor to InFit 761e.

Attention: The protective sleeve efficiently guards the plug-type connection between electrode and cable against dirt, humidity and mechanical stress. Therefore it is mandatory to use the

protective sleeve for any instal lation.

4.2.2.2 InFit 764e

Caution! Damaged electrodes / sensors must never be installed.

Attention: To ensure tightness of the housing it is mandatory to use the antikink cable gland ”A”. In

this case, lead the cable from the bottom through the antikink cable gland ”A” before connecting it to the transmitter.

Caution! It is mandatory to follow the sequence outlined below when fastening the cap nut ”E” and the plastic adapter ”D” (see illustration on page 39), otherwise the pH/Redox electrode may break.

Page 34

36 InFit 761/ 4e Series

1. 1Remove protective sleeve ”C”, plastic adapter ”D”, and nally undo cap nut ”E”.

2. Make sure you have chosen the appro priate type of pH/Redox electrode (see Section 11).

3. Remove watering cap from electrode tip, then undo the lling plug and the rubber band. Rinse the electrode tip (membrane) with water. The rubber band must always be removed

before the electrode is tted.

Danger! Do not tilt the electrode once the filling plug has been removed as this could cause the reference electrolyte to drain from the filling orifice.

4. Check the level of the reference electrolyte inside the electrode, and top up as re quired (see Instruction Manual of the respective electrode).

5. Carefully insert the electrode into the immersion tube until it is properly seated on the PTFE saddle.

Attention: For lateral installation make sure the marking ”Position electrode this side up” is on top. Assuming the level is correct, no reference electrolyte can drain from the filling orifice in this position.

6. Check at gasket of upper part for damage and replace, as required. Locate upper part and fasten the cap nut ”E” by hand.

Caution! Cap nut ”E” must be fastened only after the plastic adapter ”D” has been removed.

7. Check seal of plastic adapter ”D” and replace, as required. Locate plastic adapter and tighten by hand.

8. Remove cap of the plug-type connector from the electrode.

9. Push connector of cable through the protective sleeve ”C” and fasten connector to plug-type head of the sensor.

10. Mount protective sleeve ”C” and tighten by hand. Secure cable gland ”A” or mount slotted cable grommet ”F” to cable and push into protective sleeve ”C” .

11. Adjust compensation pressure: The compensation pressure may be adjusted at the valve insert of the pressure gauge using the supplied air pump, or by con necting a permanent, oil-

free and ltered pressure supply (use pressure connection set included in the delivery).

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 35

InFit 761/ 4e Series 37

Fitting of electrode/sensor to InFit 764e.

Attention: The protective sleeve efficiently guards the plug-type connection between electrode and cable against dirt, humidity and mechanical stress. Therefore it is mandatory to use the

protective sleeve for any instal lation.

4.3 Startup Procedures for Housings

Attention: Before startup, all fitting and in stallation work (see Section 4.2) must have been

completed!

• Each time before startup, check the mea suring system;

• Inspect the electrode / sensor assembly and examine housing and system for leaks;

• Do not commence operation until the measuring system has been checked and any necessary corrective action taken.

Before startup of an Ex-proof housing in a hazardous area, it is to be clarified beyond doubt that it is permitted to use the housing in question in conjunction with the other asso ciated plant resources.

Caution! Be careful when manipulating the housing after is has been set into operation. It is mandatory to observe the information given in Section 5.1.

Pressure compensation is required only when using an electrode with liquid electrolyte.

In order to clearly define the flow direction of the reference electrolyte, there must always be an overpressure (0.5 to 2 bar / 7.25 to 29 psig) in the reference electrode relative to the medium (pressure in the stirrer vessel).

Page 36

38 InFit 761/ 4e Series

Note that the hydrostatic pressure of the me dium must be taken into account. The pressure required for the pressure compensation of the reference electrode is either supplied by the air pump included in the delivery or by a separate oil-free and dust-free pressure supply. If you wish to connect a separate pressure supply replace the valve insert with the pressure connection set. The actual pressure can be read from the pressure gauge.

Attention: If the pressure is supplied by the pump the actual pressure must be checked and re-adjusted on a regular schedule.

To relieve the system from the compensation pressure slightly loosen the valve insert or disconnect and purge the pressure supply.

4.4 Dismantling Work

4.4.1 Removing the Insertion Housing

Put the system into which the housing is incorporated in a safe state (depressurized, emptied, rinsed, purged, vented, etc.).

Then, loosen the appropriate connection and withdraw the housing.

4.4.2 Removing the Electrode / Sensor

Caution! Installation and removal of electrodes / sensors must be carried out only in safe conditions.

InFit 761e:

1. Undo antikink cable gland ”A” or remove slotted cable grommet ”F” from protective sleeve ”C” and from cable.

2. Remove protective sleeve ”C” from housing. Remove connector ”B” from electrode cable and withdraw it from protective sleeve ”C” .

3. Carefully unscrew electrode / sensor and smoothly remove it from tube.

4. Check sliding disk and O-ring of electrodes / sensors for damage and replace, as required.

Attention: Specific information on the electrode (matching to the measuring system, storage of electrodes, etc.) is found in the documentation supplied with the electrode or the measuring system.

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 37

InFit 761/ 4e Series 39

D E

Removal of electrode / sensor from InFit 761e housing.

InFit 764e

Caution! It is mandatory to follow the sequence outlined below when removing the plastic

adapter ”D” and the cap nut ”E”, otherwise the pH / Redox electrode may break.

1. Depressurize the upper part by slightly undoing the valve insert of the pressure gauge, or by disconnecting the external pressure supply. Fasten the valve insert again.

2. Undo antikink cable gland ”A” or remove slotted cable grommet ”F” from protective sleeve ”C” and from cable.

3. Remove protective sleeve ”C” from housing. Remove connector ”B” from electrode cable and withdraw it from protective sleeve ”C” .

4. Undo and remove plastic adapter ”D”.

5. Undo cap nut ”E” and remove upper part.

6. Carefully withdraw electrode from the immersion tube.

Attention: Specific information on the electrode (matching to the measuring system, storage of electrodes, etc.) is found in the documentation supplied with the electrode or the measuring system.

Page 38

40 InFit 761/ 4e Series

Removal of electrode / sensor from InFit 764e housing.

4.5 Sterilization

The InFit 761e housing equipped with the appropriate electrodes / sensors are suitable for sterilization and autoclaving.

Caution! Pay attention to the specifications of electrodes / sensors.

Caution! Do not sterilize or autoclave the InFit 761/ 4e housing with wetted parts made of

plastic!

Attention (InFit 761e): Prior to autoclaving the (black) protection sleeve and the connection cable must be removed. Wait until the reactor has cooled down before re-installing these parts!

The InFit 764e insertion housing allows for sterilization of the built-in electrode.

Caution! Pay attention to the specifications of electrodes / sensors.

Caution (InFit 764e)! Autoclaving and heating of the entire housing is prohibited!

Retractable Housing InFit 761/ 4e Series © 06/2021 METTLER TOLEDO 52 403 547 K Printed in Switzerland

Page 39

InFit 761/ 4e Series 41

5 Operation

5.1 Important Information for Everyday Operation

During operation:

• Never remove fastening components (screws / bolts of flange, cap nut, etc.);

• If any malfunction occurs during ope ration, the equipment in which the housing is installed

must first be made safe before any corrective measures are taken;

• For all work on the equipment during everyday operation, wear the stipulated protective clothing

(protective goggles, gloves, breathing apparatus, etc.).

5.2 Inspection Work in Everyday Operation

The following inspection work should be performed in everyday operation:

• Check fastenings (cap nut, flange, NPT thread) of the housing at the vessel for firm seating

and possible leaks.

• Check the condition of the electrode / sensor. A faulty or damaged electrode / sensor must be

replaced without delay.

Housings with pressure compensation (InFit 764e):

• Check functioning of pressure gauge;

• Check air pressure in upper part (read pressure gauge). The air pressure must be at least

0.5bar / 7.25 psig (2 bars / 29 psig maximum) above that of the sample medium (take

hydro static pressure of the sample medium into account) to ensure the flow of electrolyte from the reference electrode to the sample medium.

Attention: The desired overpressure is set with the supplied air pump via the valve insert at the pressure gauge or established by means of a compressed air supply.

• Check level of the reference electrolyte. The level of the reference electrolyte steadily sinks due

to outflow through the diaphragm. If the liquid level has sunk to a level below the mouth of the bulb (re servoir) of the pH / Redox electrode, then the reference electrolyte must be topped up (see Section 6 “Maintenance”).

5.3 Cleaning the Electrode / Sensor

The electrode / sensor must be cleaned before removal, before calibration of the mea surement system or at regular intervals during operation (depending on the process medium).

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42 InFit 761/ 4e Series

5.4 Calibrating the Measuring System

It is not mandatory to remove the electrode from the housing for calibration. The same applies to the pressure compensation of the InFit 764e housing which does not need to be disconnected. The installed electrode may be directly immersed in the buffer solutions.

For further details on the calibration procedure please refer to the Instruction Manuals of the electrode and the pH / mV transmitter.

Attention: After installation of the housing check for possible leaks.

Important! Further information on the ope ration of pH / Redox electrodes and O2, CO2, turbidity

and conductivity sensors is found in the respective Instruction Manuals.

6 Maintenance

6.1 Important Information on Maintenance

Caution! The process medium may be harmful to your health and / or the environment (toxic,

caustic, etc.). For this reason you have to put the system into a safe state before starting any maintenance work.

Always keep electrode / sensor, housing and socket clean.

Replace defective seals and other components without delay.

The information and instructions given in Section 1 and Section 2 must be fully adhered to.

Maintenance and service work on the housings may be carried out by appropriately trained personnel only.

Only genuine spare parts from METTLER TOLEDO must be used, otherwise all guarantees become automatically invalid.

Only the maintenance and repair work des cribed in the following sections may be per formed on the insertion housings.

Information on the maintenance of electrodes and sensors are found in the respective Instruction Manuals.

Attention: Service carried out by authorized METTLER TOLEDO technicians: Your local distributor will be pleased to offer professional service and care. Please contact your local supplier for more information.

Page 41

InFit 761/ 4e Series 43

6.2 Topping up Reference Electrolyte

The work described below applies only to pH / Redox electrodes with liquid reference electrolyte. In order to top up the reference electrolyte, proceed as follows:

1. Remove electrode (see Section 4.4).

Attention: The reference electrolyte may not be topped up with the electrode in stalled.

2. Top up reference electrolyte (Electrolyte no. see “Rell“ marking on the electrode).

Caution! Take care not to exceed the maximum filling level.

3. Re-install the electrode (see Section 4.2.2).

Do not allow any spillage of reference electrolyte to remain in the housing. Wash down and dry the housing.

6.3 Replacement of Medium-Wetted Seals

All medium-wetted seals should be replaced at least every 6 months for reasons of safety. With aggressive media, the seals may need to be replaced at correspondingly shorter intervals. Medium-wetted seals must be examined at least once a month, as well as during normal maintenance procedures, to check for soiling or damage.

Attention: Seals are wearing parts which must be regularly examined by the operator of the housing, and replaced if necessary (dependent upon application).

Replacement of medium-wetted seals

All medium-wetted seals should under all circumstances be replaced at least every 6 months.

Check on medium-wetted seals

METTLER TOLEDO recommends that medium-wetted seals should under all circumstances be examined and checked every 3 months.

In the case of aggressive or abrasive media, the seals may need to be checked / replaced at shorter intervals.

Attention: Recommendations by METTLER TOLEDO concerning maintenance intervals are based solely on experience gained in standard applications and in no way binding or an admission of any guarantee liability whatso ever on the part of the manufacturer / supplier. Depending upon the degree of aggressiveness of the process medium, the necessary maintenance intervals to support smooth operation of the equipment may be correspondingly shorter.

Attention: All O-rings are made of FDA approved materials. In addition, Kalrez® O-rings are certified according to USP Class VI.

Page 42

44 InFit 761/ 4e Series

Caution!

• Insertion housings may only be stripped down for maintenance and repair work after having being completely dismounted from the equipment in which they were installed for operation;

• Only perform the dismantling work des cribed and instructed in this section and replace only the seals listed above. Check that the correct types of seals have been selected, examine for any signs of damage and for correct seating;

• Ensure that the seals are of the correct material quality (see Section 8).

Proceed as follows to replace the seals:

1. Set the housing out of service (see Section 4.4).

2. Remove electrode / sensor from the housing (see Section 4.4.2) and store as des cribed in

the electrode / sensor operating instructions.

3. Remove the housing from the equipment (reactor, vessel, pipe, etc.) in which it is installed

(see Section 4.4.1) and place it on a clean working surface.

Caution! Never place or support the housing on the front ends of the centering spigot or on the immersion tube (risk of damage).

4. Remove the indicated seals with a ne hook making sure not to scratch their contact surfaces.

5. Lightly grease new O-rings (set of seals) with lab grease!

Caution! No grease may be applied to the O-Ring ”B” in the immersion tube, as there is a danger that grease could contact and adhere to the electrode / sensor tip (diaphragm / glass membrane) when reinstalling the electrode / sensor, and have adverse effects on its function.

6. Carefully insert O-rings ”B” and ”A” using the assembly mandrel, (part no. 59 908 798).

Replacement of O-rings.

Page 43

InFit 761/ 4e Series 45

7 Trouble Shooting

In this section you will find an overview of possible malfunctions which could appear during operation of the insertion housings, their cause, as well as a guide to appropriate remedial measures.

Danger! It is essential to comply with the safety instructions given in Section 1 and Section 2.

M = Malfunction C = Cause R = Remedial action

M 1: Incorrect measuring / uctuations in measured data

C 1: Electrode / sensor defective, Transmitter defective.

R 1: Check electrode / sensor and transmitter. Repair or replace if necessary.

InFit 764e:

M 2: No pressure in upper part (pressure compensation) or drops rapidly

C 2a: Compensation pressure not set.

R 2a: Set compensation pressure with pump or check compressed air supply.

C 2b: Leak in upper part.

R 2b: Check screw ttings and seals.

C 2c: Electrode broken.

R 2c: Replace electrode.

M 3: Sample medium escapes through the NPT thread

C 3: Thread insuf ciently sealed.

R 3: Seal using PTFE tape.

M 4: Sample medium escapes at the ange connection

C 4a: Flange connection not or unevenly fastened.

R 4a: Check ange connection and/or tighten the fastenings.

C 4b: Flange gasket defective.

R 4b: Check gasket and replace if necessary.

M 5: Sample medium escapes between cap nut and weld-in socket

C 5: O-ring at centering spigot of insertion housing defective.

R 5: Remove housing and replace O-ring.

M 6: Housing leaks

C 6: O-ring ”A” or ”B” is defective (see page 49).

R 6a: The housing has to be tested for leaks with the electrode installed. Use the air pump to adjust the

pressure in the housing to 6 bars / 87 psig. An air-tight housing looses less than 0.5 bar / 7.25 psig within 10 hours.

R 6b: For testing the connection between the weld-in socket and the housing for leaks the reactor / pip-

ing / owthrough chamber must be pressurized. Air escaping from the system may be detected

using a leak detection spray.

Danger! Before carrying out any work on the housing make sure the system is in a safe state (depressurized, emptied, rinsed, purged, vented, etc.).

Page 44

46 InFit 761/ 4e Series

PVDF

0102030405060708090 100 110 120 130 140 150 160 Temp. in C

32 68 104 140 176 212 248 284 320 Temp. in F

14.5

43.5

72.5

Pressure in bar (10

Pa)

Pressure in psi

0102030405060708090 100 Temp. in C

32 68 104 140 176 212 Temp. in F

14.5

43.5

72.5

PP PVDF

Pressure in bar

Pressure in psi

8 Product Specications

8.1 Technical Data

8.1.1 Technical Specications InFit 761e

Note: The technical specifications of the installed electrode / sensor must be taken into consideration.

Ambient conditions

Temperature 0 … 70 °C (32 …158 °F)

Process conditions

Housing Material Max. permissible pressure

and temperature [PS] / [TS]: (linear relation with plastic housings)

InFit 761/*S DIN 1.44 3 5, 16 bar / 140 °C

DIN 2.4602/AISI Alloy C22, Ti

PP PVDF

(232 psig / 284 °F)

InFit 761/WK PP

PVDF

InFit 761/NC D I N 1.4 4 35 16 bar / 140 °C

DIN 2.4602/AISI Alloy C22

(232 psig / 284 °F)

Page 45

InFit 761/ 4e Series 47

InFit 761/*Y DIN 1.44 3 5, 6 bar / 140 °C

DIN 2.4602/AISI Alloy C22,

(87 psig / 284 °F)

Ti,

PVDF 6 bar / 20 °C

(87 psig / 68 °F) 1 bar / 100 °C

(14.5 psi g / 212 °F)

Immersion length

Immersion length ans appropriate sensor length see Section 11.

Wetted materials DIN 1.44 3 5,

DIN 2.4602/Alloy C22, titanium, PP, PVDF

Wetted seals Silicone (MVQ)-FDA USP Class VI,

Viton

(FKM)-FDA, EPDM-FDA, Kalrez® (FFKM)-FDA USP Class VI

Non-wetted materials Handle complete Polypropylene (PP antistatic)

Weight approx. 0.5 kg

Pressure information According to PED 97/23/EG-Article 1, Section 2.2 “Intended Use” is referenced to

atmospheric pressure, e.g. an overpressure. Accordingly, a pressure in the vacuum region will be expressed as a negative pressure.

Explosion protection

(Applicable for all housings with wetted parts made of metall)

According to ATEX directives (2014/34/EU):

II 1/2G Ex h IIC T6 … T3 Ga/Gb

II 1/2D Ex h IIIC T69 °C … T141 °C Da/Db SEV 13 ATEX 0161 X IECEx SEV 19.0014X

According to FM directives: IS CL I,II,III, Div 1, GR A,B,C,D,E,F,G

Tamb. = 0 °C to + 60 °C,

indoor and outdoor environments. FM control drawing: 53800002; Original project ID 3021227;

FM Certicate number: FM16US0034X

FM18CA0021X

Certicates / approvals Depending on housing model, following certicates / approvals are included:

• CE Declaration of Conformity

• Pressure Equipment directive

• Certicate of Conformit y according to EN10204 2.1, material certicate according

to 3.1B

• ATEX

• cFMus Approval

• MaxCert™

Appropriate types of

See Section 11.

electrodes

For more detailed information regarding electrodes and sensors please refer to the corresponding data sheets or contact your METTLER TOLEDO representative.

Page 46

48 InFit 761/ 4e Series

8.1.2 Technical Specications InFit 764e

Note: The technical specifications of the installed electrode / sensor must be taken into consideration.

Ambient conditions

Temperature 0 … 70 °C (32 …158 °F)

Process conditions

Housing Material Max. permissible pressure

and temperature [PS] / [TS]: (linear relation with plastic housings)

InFit 764 DIN 1. 4435, 16 bar / 130 °C

DIN 2.4602/AISI Alloy C22, Ti

PVDF 6 bar / 20 °C

(232 psig / 266 °F)

(87 psig / 68 °F) 1 bar / 110 °C

(14.5 psi g / 230 °F)

Immersion length

Immersion length and appropriate sensor length see Section 11.

Wetted materials DIN 1.44 3 5,

DIN 2.4602/Alloy C22, Titanium, PVDF

Wetted seals Silicone (MVQ)-FDA USP Class VI,

Non-wetted materials

Top piec e: Nickel-plated brass,

Cy li nder: Glass

Saddle: PTFE

Handle compl.: Polypropylene (PP) antistatic

Weight approx. 2 kg

Pressure information According to PED 97/23/EG-Article 1, Section 2.2

Viton

(FKM)-FDA, EPDM-FDA, Kalrez® (FFKM)-FDA USP Class VI

Polypropylene (PP) antistatic

“Intended Use” is referenced to atmospheric pressure, e.g. an overpressure. Accordingly, a pressure in the vacuum region will be expressed as a negative pressure.

Page 47

InFit 761/ 4e Series 49

Explosion protection

(Applicable for all housings with wetted parts made of metal and antistatic PVDF.)

According to ATEX directives (2014/34/EU):

II 1/2G Ex h IIC T6 … T3 Ga/Gb

II 1/2D Ex h IIIC T69 °C … T141 °C Da/Db SEV 13 ATEX 0161 X IECEx SEV 19.0014X

According to FM directives: IS CL I,II,III, Div 1, GR A,B,C,D,E,F,G

Tamb. = 0 °C to + 60 °C,

indoor and outdoor environments. FM control drawing: 53800002; Original project ID 3021227;

FM Certicate number: FM16US0034X

FM18CA0021X

Certicates/approvals Depending on housing model, following certicates / approvals are included:

• CE Declaration of Conformity

• Pressure Equipment directive

• Certicate of Conformit y according to EN10204 2.1, material certicate

according to 3.1B

• ATEX directive

• cFMus Approval

• MaxCert°C

Appropriate types of electrodes See Section 11.

For more detailed information regarding electrodes and sensors please refer to the corresponding data sheets or contact your METTLER TOLEDO representative.

8.2 Spare Parts and Accessories

Spare parts (see drawings).

No. and designation Order no.

O-ring replacement set Silicone USP 76Xe 52 403 459

O-ring replacement set Ethylene Propylene FDA 76Xe (both numbers need to be ordered!)

O-ring replacement set Viton

O-ring replacement set Kalrez® USP 76Xe (25 mm ø shaft) 52 403 462

O-ring replacement set Kalrez (19 mm shaft ø) 52 403 504

Retrot kit for InPro 6860i / 6970i 52 403 811

(100) Antikink cable gland Pg 16 52 403 470

(90) Cable grommet set 5 mm / 7 mm 52 403 463

(110) Cap nut G 1¼" (NPSM),

Ms, height = 18 mm 59 901 133

(120) Cap nut G 1¼" (NPSM),

Ms for sensor holder type ”C” 59 909 320

(130) Protective tube InFit 761/ 4e 52 403 465

FDA 76Xe 52 403 461

USP 76Xe

52 403 460

30 558 412

Spare parts only for InFit 761e:

(140) Protective tube long 761e 52 403 464

(150) Adapter InFit 761/ WK 52 403 466

Page 48

50 InFit 761/ 4e Series

10.78 x 2.62

20.29 x 2.62

110

140

100

130

150

10.77 x 2.62

100

90 90

140

10.78 x 2.62

20.29 x 2.62

100

10.78 x 2.62

15.60 x 1.78

140

10.78 x 2.62

20.29 x 2.62

110

140

100

130

150

10.77 x 2.62

100

90 90 90 90

Spare parts only for InFit 764e:

(10) Adapter cpl. with gasket 764e 52 403 468

(20) PTFE bushing 59 901 136

(30) Glass cylinder 59 901 147

(40) Flat gasket set 764e 52 403 523

(50) Top piece complete 7XX 52 403 524

(60) Pressure gauge 0 … 6 bar compl. 59 901 296

(70) Pressure connection set 59 905 552

(80) Valve insert 59 905 517

90 90

100

140

20.29 x 2.62

10.78 x 2.62

InFit 761/NS InFit 761/NY

100

130

100

140

15.60 x 1.78

10.78 x 2.62

17.12 x 2.62

20.29 x 2.62

10.78 x 2.62

10 50

60 60

917640016IG

17.12 x 2.62

120

20.29 x 2.62

10.78 x 2.62

110

InFit 764/NC InFit 764/WS

Page 49

InFit 761/ 4e Series 51

90 90

100

130

140

150

110

20.29 x 2.62

10.78 x 2.62

10.77 x 2.62

InFit 761/NC InFit 761/WK

Accessories

Designation Order no.

Weld-in socket

Weld-in socket L=40/DN25/inclined/1.4435

Weld-in socket L=48/DN25/inclined/1.4435

Weld-in socket L=55/DN25/inclined/1.4435 59 901 126

Weld-in socket L=40/DN25/straight/1.4435 59 901 127

Weld-in socket L=50/DN25/straight/1.4435 59 901 128

Weld-in socket L=60/DN25/straight/1.4435 59 901 129

Threaded socket L=40/DN19/1.4435 59 901 290

Safety weld-in socket L=47/DN25/straight/1.4435 52 400 518

Safety weld-in socket L=40/DN25/inclined/1.4435 52 400 462

Weld-in socket L=40/DN25/inclined/Alloy C22 59 901 245

Weld-in socket L=40/DN25/straight/Alloy C22 59 901 242

Weld-in socket L=40/DN25/straight/PVDF 59 901 206

Weld-in socket L=40/DN25/inclined/PVDF 59 901 208

59 900 903

59 901 125

Page 50

52 InFit 761/ 4e Series

Blind plug

Blind plug DN25 L=40/inclined/1.4435/Silicone USP 59 901 283

Blind plug DN25 L=48/inclined/1.4435/Silicone USP 59 901 284

Blind plug DN25 L=55/inclined/1.4435/Silicone USP 59 901 285

Blind plug DN25 L=40/straight/1.4435/Silicone USP 59 901 287

Blind plug DN25 L=50/straight/1.4435/Silicone USP 59 901 288

Blind plug DN25 L=60/straight/1.4435/Silicone USP 59 901 289

Blind plug DN19 L=42/straight/1.4435 59 901 294

Safety blind plug DN25/L=30/1.4435/Silicone USP 52 400 464

Blind plug DN25/L=40/straight/Alloy C22/Kalrez® USP 59 908 917

Blind plug DN25/L=40/inclined/PVDF/Viton

-FDA 59 901 318

Protective cage

Protective cage, for immersion length H>=100 mm/1.4435 59 901 132

Protective cage, for immersion length H>=100 mm/Alloy C22 52 402 858

Further accessories on request at your local METTLER TOLEDO representative.

Note: The replacement of other parts of the housing may be made only by a trained specialized person. Please contact your local METTLER TOLEDO distributor.

Note on accessories: Further information on particular accessories is found in the respective technical docu mentation. For more ample information please contact you local METTLER TOLEDO distributor.

Page 51

InFit 761/ 4e Series 53

9 Terms of Warranty

The housings employ state-of-the-art technology and are very reliable. They are permanently revised to meet the latest technical evolutions and leave the factory only after having passed thorough quality testing. The warranty period of 12 months starts from the date of delivery. The warranty covers all defects due to faulty material or manu facturing.

Normal wear or damage caused by inade-qua te use (such as chemical incompatibility, etc.). are not covered by the warranty. In any case, the warranty is limited to the replacement or repair of faulty products, depending on manufacturer’s choice. The warranty is void if the customer or any third party apply modifications to products supplied by METTLER TOLEDO. Any defect that may be subject to warranty must be reported to the supplier without delay or, at the latest, before the warranty period ends.

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54 InFit 761/ 4e Series

10 Decommissioning, Storage, Disposal

Caution: The safety notes in Section 2 “Important Notes” must be observed. Decommissioning

may only be carried out by persons with appropriate training or by skilled technicians.

10.1 Decommissioning

10.1.1 Proceed as Described in Section 4.4 ”Dismantling Work”.

10.1.2 Repair

If you cannot remedy a problem on the spot send the housing to your local distributor, together with an ample description of the problem.

Caution: To protect our service staff, housings that have been in touch with toxic or other wise dangerous substances must be thoroughly cleaned and clearly marked before dispatching.

10.2 Storage

Store the InFit 761/ 4e in a dry place. Before storage, the housing must properly cleaned and dry.

10.3 Disposal

It is mandatory that the operator disposes of the device in accordance with local regu lations. The operator must deliver the device either to a licensed private or public disposal company, or dispose of it himself in accor dance with prevailing regulations. Waste is to be recycled or disposed of without causing any risk to human health, and without using procedures or methods that might harm the environment.

Sorting

Sorting into waste groups takes place when dismantling the device. The groups are listed in the current European Waste Catalogue. This catalog is valid for all kinds of waste, whether intended for disposal or for recycling.

The packaging is made up of the following materials:

• cardboard;

• foam plastic.

The housing is made of the materials specified in the technical data.

Page 53

InFit 761/ 4e Series 55

11 Appendices

11.1 Electrode / Sensor Selection

Concise overview of electrode and sensor length in relation to the length of the housing (immersion length = H).

InFit 761e

H = Immersion length a-Length of the electrode / sensor

H = 25 mm, H = 33 mm, H = 40 mm, H = 70 mm

pH DPA/DPAS, DXK, InPro 3030, InPro 3100, InPro 3200, InPro 3250, InPro 3300,

Dissolved oxygen InPro 6050, InPro 6800, InPro 6900

Conductivity InPro 7001-VP

Turbidity InPro 8050, InPro 8100, InPro 8200

H = 100 mm 150 mm (pH)

pH DPA/DPAS, DXK, InPro 3030, InPro 3100, InPro 3200, InPro 3250, InPro 3300,

120 m m

InPro 4010, InPro 4250, InPro 4800

InPro 5000

InPro 4010, InPro 4250, InPro 4800

H = 175 mm 205 mm (turbidity), 220 mm (DO, CO

pH DPA/DPAS, DXK, InPro 3030, InPro 3100, InPro 3200, InPro 3250, InPro 3300,

InPro 4250, InPro 4800

Dissolved oxygen InPro 6800, InPro 6900

Conductivity InPro 7001-VP

Turbidity InPro 8100, InPro 8200

H = 275 mm 297 mm (turbidit y), 320 mm (DO, CO2) or 325 mm (pH)

pH DPA/DPAS, DXK, InPro 3030, InPro 3100, InPro 3200, InPro 3250, InPro 3300,

Dissolved oxygen InPro 6800, InPro 6900

Turbidity InPro 8100, InPro 8200

H = 375 mm 407 mm (turbidity), 420 mm (CO2) or 425 mm (pH)

pH DPA/DPAS, DXK, InPro 3030, InPro 3100, InPro 3200, InPro 3250, InPro 3300,

Dissolved oxygen InPro 6800, InPro 6900

Turbidity InPro 8100, InPro 8200

InPro 5000

InPro 4250, InPro 4800

InPro 5000

InPro 4250, InPro 4800

) or 225 mm (pH, conductivity)

Note: For more information on the wide range of available METTLER TOLEDO electrodes and sensors please contact your METTLER TOLEDO representative.

Page 54

56 InFit 761/ 4e Series

InFit 764e

H = Immersion length a-Length of the electrode / sensor

H = 70 mm 120 m m

pH (HA, HF, LoT) 465-50, InPro 2000

Redox Pt4865-50

H = 100 mm 150 mm

pH (HA, HF, LoT) 465-50, InPro 2000

Redox Pt4865-50

H = 150 mm 200 mm

pH (HA, HF, LoT) 465-50, InPro 2000

Redox Pt4865-50

H = 200 mm 250 mm

pH (HA, HF, LoT) 465-50, InPro 2000

Redox Pt4865-50

Page 55

InFit 761/ 4e Series 57

Electrode / sensor type

1 pH/Redox electrodes, O2, CO2, turbidity and conductivity sensors (Ø 12 mm and Pg 13.5 thread) 4 pH/Redox electrodes with liquid electrolyte

Protective cage

W Sensor holder with protective cage N Sensor holder without protective cage

Sensor holder

Y Ø 19 mm shaft S Ø 25 mm shaft C Ø 25 mm CIP shaft without protective cage K NPT shaft

Immersion length = H, (depending on version with/without protective cage ±5mm)

0 02525 mm immersion length (only for sensor holder type «C») 0 03333 mm immersion length (only for sensor holder type «C») 0 04040 mm immersion length 0 07070 mm immersion length 0 100100 mm immersion length 0 150150 mm immersion length 0 175175 mm immersion length 0 200200 mm immersion length 0 275275 mm immersion length 0 375375 mm immersion length

Material (wetted parts)

4 435DIN 1.4435 C22 − DIN 2.4602/Alloy C22 TI −−Titanium PP−−Polypropylene PVDF Polyvinylidene fluoride

Process connections

D00 Ingold DN25

D10 Ingold DN25

D11 Ingold DN25

D04Flange DN50-PN16 (Ø 25 mm shaft) P01Socket DN19 M26x1 P02

/4" R/NPSM (Ø 19 mm shaft) P29Socket DN25 groove pos. 43.6 (type «C») N04 NPT 3/4" N01NPT 1" T01Tri-Clamp flange 1.5" straight T02Tri-Clamp flange 2" straight T03Tri-Clamp flange 1.5" inclined V01 Varivent flange DN 50 straight V02 Varivent flange DN50 inclined

O-ring material

Vi FKM Viton

FDA EPEPDM FDA KaFFKM Kalrez®6230 FDA/USP Class VI Si MVQ Silicone FDA/USP Class VI

O-ring position

− no groove 2 22.4 groove distance 4 24.5 groove distance 9 29 groove distance S Special groove distance

Special

− Standard S Special

InFit 76 / ////

89101112131415161718192021222324252627282930

Appropriate sensor lengths for the immersion lengths, please refer to the Section 11 «Electrode/sensor selection».

Cap nut made of DIN 1.4435 (height=18), cap nut made of plastic, cap nut for safety socket and the sensor holder type «C» made of 1.4435 (height = 22)

Hexagon nut made of DIN 1.4305 (heigth=18)

Cap nut made of brass (height = 18)

For additional information refer to the dimensional drawings in the technical data.

11.2 Product Key

Page 56

58 InFit 761/ 4e Series

Notes

Page 57

InFit 761/ 4e Series 59

Notes

Page 58

For addresses of METTLER TOLEDO Market Organizations please go to:

www.mt.com/pro-MOs

METTLER TOLEDO Group

Process Analytics Local

contact: www.mt.com/pro-MOs

www.mt.com/pro

For more information

ISO

9001

certiﬁed

Management System certiﬁed according to ISO 9001 / ISO 1 4001

ISO

1 4001

certiﬁed

*52403547K*

Mettler Toledo Mettler InFit761e/InFit�761e Static Housings, Mettler InFit�764e Static Housing Manual

How to use this Instruction Manual

Contents

1 Introduction

1.1 Declaration of Conformity / Type Examinations

1.2 Housing Designations

1.3 Basic Principles

1.4 Responsibilities, Organizational Measures

1.4.1 Responsibilities of the Operator

1.4.2 Responsibilities of the Personnel

1.5.1 Removal of Electrode / Sensor

1.5.2 Manipulation and Maintenance Work on the Housings

1.5.3 Plastic Housings

1.5.4 Installation in Pressurized Systems

1.5.5 Installation in Potentially Explosive Areas (Hazardous Areas)

1.6 Residual Hazards

1.6.1 Leaky Connections

1.6.2 Medium Residues

1.6.3 Heat Protection

1.6.4 External Impacts

1.7 Emergency Measures

1.8 Safety Measures

2 Important Notes

2.2 Intended Use

2.3 Safety Instructions

2.4 Correct Disposal of the Housing

2.5 Use in Ex zones

2.6.1 Introduction

2.6.2 Special Conditions

2.7.1 Introduction

2.7.2 Special Conditions

2.7.3 Applied Standards

2.8 Hygienic Instruction

3 Product Description

3.1 Scope of Delivery

3.2 Packing

3.3 Checking the Shipment

3.4 Product Overview

3.5 Functional Description of the Housing

4 Installation and Start-Up

4.1 Preparation of the Equipment

4.2 Fitting and Installation Work

4.2.1 Fitting the Housing

4.2.1.1 Fitting with a Weld-in Socket

4.2.1.2 Fitting with a Flange

4.2.1.3 Fitting via NPT External Thread

4.2.1.4 Fitting with Tri-Clamp and Varivent Flange Connection

4.2.1.5 Installation with NPSM Thread

4.2.2 Fitting the Electrode / Sensor

4.2.2.1 InFit 761e

4.2.2.2 InFit 764e

4.3 Startup Procedures for Housings

4.4 Dismantling Work

4.4.1 Removing the Insertion Housing

4.4.2 Removing the Electrode / Sensor

4.5 Sterilization

5 Operation

5.1 Important Information for Everyday Operation

5.2 Inspection Work in Everyday Operation

5.3 Cleaning the Electrode / Sensor

5.4 Calibrating the Measuring System

6 Maintenance

6.1 Important Information on Maintenance

6.2 Topping up Reference Electrolyte

6.3 Replacement of Medium-Wetted Seals

7 Trouble Shooting

8.1 Technical Data

8.2 Spare Parts and Accessories

9 Terms of Warranty

10 Decommissioning, Storage, Disposal

10.1 Decommissioning

10.1.1 Proceed as Described in Section 4.4 ”Dismantling Work”.

10.1.2 Repair

10.2 Storage

10.3 Disposal

11 Appendices

11.1 Electrode / Sensor Selection

11.2 Product Key