Mettler Toledo InPro 7250 Instruction Manual

InPro®7250 52 002 799

InPro®7250 Series

Inductive Conductivity Sensors Induktive Leitfähigkeitsmesszellen Sondes de conductivité inductive

Instruction Manual Bedienungsanleitung Instructions d’utilisation

1258

2 InPro®7250 Series

English Page 3

Deutsch Seite 25

Français Page 49

InPro®7250 Series 3

InPro®7250 Series

Instruction Manual

© 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.

4 InPro®7250 Series

Contents

1 Introduction ..................................................5

2 Important notes ............................................6

2.1 Notes on operating instructions................................6

2.2 Intended use..........................................................6

2.3 Safety instructions ..................................................7

2.4 Use in hazardous zones..........................................8

2.5 Ex-classification ATEX............................................8

2.5.1 Introduction ..........................................................8

2

.5.2 Rated data ............................................................8

2.5.3. Special conditions for safe use ................................9

2.5.4 ATEX certificate ....................................................10

2.5.5 IECEx Certificate of Conformity ..............................12

2.6 Ex-classification FM Approved ..............................14

2.7 Declaration of conformity ......................................15

3 Product description ....................................16

3.1 General information..............................................16

3.2 Principle ............................................................16

3.3 Sensor identification ............................................16

3.4 Sensor applications..............................................17

4 Installation, operation and maintenance ......18

4.1 Sensor installation................................................18

4.2. Connection of the sensor ......................................20

4.3 Flange installation................................................20

4.4 Bushing installation..............................................21

4.5 Immersion installation with an InDip 550 Ind ..........21

4.6 Sanitary installation..............................................22

4.7 Disposal ............................................................22

5 Product specifications ................................23

5.1. Sensor specifications............................................23

6 Ordering information ..................................24

6.1. Sensors ..............................................................24

6.2 Spare parts..........................................................24

6.3 Process Connections and Accessories ....................24

6.4 Transmitter M700(x), module Cond Ind 7700(x) ....25

6.5 Transmitter M400, (4-wire Transmitter) ..................25

InPro®7250 Series 5

1 Introduction

T

hank you for buying the InPro 7250 Series sensor from

METTLER TOLEDO.

The construction of the InPro 7250 Series sensors employs leading edge technology and complies with safety regulations currently in force. Notwithstanding this, improper use could lead to hazards for the user or a third-party, and/or adverse effects on the plant or other equipment. Therefore, the operating instructions must

be read and understood by the persons involved before work is started with the sensor.

The instruction manual must always be stored close at h

and, in a place accessible to all people working with

the sensor.

If you have questions, which are not or insufficiently answered in this instruction manual, please contact your METTLER TOLEDO supplier. They will be glad to assist you.

6 InPro®7250 Series

2 Important notes

2.1 Notes on operating instructions

T

hese operating instructions contain all the information needed for safe and proper use of the InPro 7250 Series sensor.

T

he operating instructions are intended for personnel entrusted with the operation and maintenance of the sensors. It is assumed that these persons are familiar with the equipment in which the sensor is installed.

Warning notices and symbols

This instruction manual identifies safety instructions and additional information by means of the following symbols:

This symbol draws attention to safety instructions and warnings of potential danger which, if 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.

2.2 Intended use

The sensors InPro 7250 Series are intended to be used to measure conductivity and concentration of liquids, in accordance with the data in this instruction manual. Any use of these sensors 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 require-

ments set out in this instruction manual.

– acceptance of responsibility for regular inspection,

maintenance and functional testing of all associated components, also including compliance with local operational and plant safety regulations.

– compliance with all information and warnings given

in the documentation relating to the products used in conjunction with the sensor (housings, transmitters, etc.).

– observance of all safety regulations governing the

equipment in which the sensor is installed.

InPro®7250 Series 7

– correct equipment operation in conformance with the

p

rescribed environmental and operational conditions,

and admissible installation positions.

–

consultation with METTLER TOLEDO Process Ana lytics in the event of any uncertainties.

2.3 Safety instructions

– The plant operator must be fully aware of the potential

risks and hazards attached to operation of the particular process or plant. The operator is responsible for correct training of the workforce, for signs and markings indicating sources of possible danger, and for the selection of appropriate, state-of-the-art instrumentation.

– It is essential that personnel involved in the commis-

sioning, operation or maintenance of these sensors or of any of the associated equipment (e.g. housings, transmitters, etc.) be properly trained in the process itself, as well as in the use and handling of the associated equipment. This includes having read and understood this instruction manual.

– The safety of personnel as well as of the plant itself is

ultimately the responsibility of the plant operator. This applies in particular in the case of plants operating in hazardous zones.

– The conductivity sensors and associated components

have no effect on the process itself and cannot influence it in the sense of any form of control system.

– Maintenance and service intervals and schedules

depend on the application conditions, 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 sensor must neither be installed nor put

into service.

– Only maintenance work described in this operating in-

struction may be performed on the sensors.

– No modifications to the sensors and the accessories

are allowed. The manufacturer accepts no respon sibility for damages caused by unauthorised modi fications. The risk is borne entirely by the user.

8 InPro®7250 Series

2.4 Use in hazardous zones

F

or an installation in hazardous zones please read the guidelines following hereafter:

Ex-classification ATEX:

II 1/2G Ex ia IIC T6/T5/T4/T3 Ga/Gb

Number of the test certificate:

SEV 15 ATEX 0123 IECEx SEV 15.0011X

2.5 Ex-classification ATEX

2.5.1 Introduction

According to Directive 94/9/EC (ATEX 95) Appendix I, InPro 725X/*/*/* conductivity sensors are devices of equipment group II, category 1/2G which can be used in zone 0/1 or 1/2 or 1 or 2 as well as gas groups IIA, IIB and IIC, which are potentially explosive due to combustible substances in the temperature classes T3 to T6.

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

The conductivity measuring circuit and temperature measuring circuit are part of a common intrinsically safe system and are for operation connected to a separately certified transmitter.

The conductivity measuring circuit and temperature measuring circuit as part of an intrinsically safe system are isolated from conductive housing parts up to a maximum rated voltage of 30 V.

The sensors can be installed with different process adapters (flange, threaded bushes) permanently in pipes or tanks.

2.5.2 Rated data

Conductivity measuring circuit, and temperature measuring circuit1:

In type of protection intrinsic safe Ex ia IIC, only for connection to a certified intrinsically safe circuit.

Maximum values: U

i

≤ 16 V, Ii≤ 150 mA, Pi≤ 155 mW

Li= 0 (the internal inductance is ineffective towards the

outside)

C

i

= 900 pF (effective internal capacitance)

The above values are each the total of all individual circuits of the associated intrinsically safe power supply and transmitter.

InPro®7250 Series 9

2.5.3. Special conditions for safe use

1. The maximum permissible process temperatures are

in accordance with the temperature classes shown in the table below:

Temperature class Maximum permissible

process temperature

T6 68 °C T5 80 °C T4 108 °C T3 130 °C

2

. The InPro 725X/*/*/* conductivity sensors may only

be used in suitable process terminals of METTLER TOLEDO or other manufacturers in potentially explosive atmospheres.

3. The capacitance and inductance of the connecting

cable must be taken into account in the design.

4. The independent process terminal used for installa -

tion of the conductivity sensors must be connected to the equipotential bonding system of the installation.

5. The independent process terminal used for installa-

tion of the conductivity sensors must be included in the recurring pressure test of the installation if necessary.

6. The minimum conductivity of the media for safe

working in potentially explosive atmospheres must be higher than 1 nS/cm.

10 InPro®7250 Series

2.5.4 ATEX certificate

Page 1 of 3

Page 2 of 3

InPro®7250 Series 11

Page 3 of 3

12 InPro®7250 Series

2

.5.5 IECEx Certificate of Conformity

Page 1 of 4

Page 2 of 4

InPro®7250 Series 13

P

age 3 of 4

Page 4 of 4

14 InPro®7250 Series

2.6 Ex-classification FM Approved

I

S/ I, II, III /1/ABCDEFG /T6 Ta = 60 °C

FM control drawing:

Non-Hazardous Location

Hazardous (Classiﬁed) Location

Class I, Division 1, Groups A, B, C and D

Class II, Division 1, Groups E, F and G

Class III, Division 1

T6 Ta= 60 C

Any FMRC A ppro ved Sin gle

Mult i-Chan nel Barrier or App aratus

Prob e

Mettl er-Toledo GmbH

Proce ss Ana lytics

CH-89 02 Urd orf

10/02 /2005 M. Bles sing

15/07 /2005 F. Trefz

FM control drawing Cond Ind

Wir b ehalte n uns a lle Rec hte an diesem Dokume nt und an alle n Beila gen vo r. Der Em pfänge r anerk ennt

diese Recht e und w ird die genann ten Unt erlage n nicht ohne u nsere v orgäng ige sch riftlic he Erm ächtigu ng

Dritt en zug änglich machen oder a usserha lb des Zwecke s verwe nden, z u dem sie ihm überge ben wor den sin d.

Enti ty Par amet ers:

V

t

=16 V, I

t

=150 mA, P

max

= 155 mW

C

i

= 900 pF, L

i

0.3 mH

Note s:

WARN ING: subst itut ion of compon ents may inpai r in trinsic safet y.

1. No rev isio n to th is draw ing is per mitted withou t FM RC appr oval

2. V

max

> V

t

; I

max

> I

t

; (C

i

of all lo ops + C cab le) < C

a

; (L

i

of all lo ops + L cab le) < L

a

; P

max

or P

i

> P

0

3. Single Mul ti-Chan nel IS Barrie r or Appara tus mu st b e FMRC Approv ed

5. Instal lati on must be in accord ance with A rticle 500 of the NEC

®

(ANS I/NFPA 70)

and A NSI/ ISA RP1 2.6.

4. Single Mul ti-Chan nel IS Barrie r or Appara tus ma nufa cturer' s cont rol draw ings

must be f ollowed when i nstall ing the Sys tem. I S Ba rrier o r Equi pmen t ma y be

insta lled within the Ha zardou s (C lassiﬁe d) loc atio n for w hich i t is app roved.

InPro®7250 Series 15

2.7 Declaration of conformity

I

nPro 725X HT

InPro 725X ST

16 InPro®7250 Series

3 Product description

3.1 General information

T

he conductivity sensors InPro 7250 Series with inte grated temperature sensor are intended to be used to measure conductivity and concentrations of liquids. The sensor is designed for the measurement of medium and h

igh conductivity values.

3.2 Principle

The sensors InPro 7250 Series measure an induced current in a loop of solution.

Two toroidally wound coils are encapsulated in close proximity within the sensor which is immersed in the solution. An AC signal, applied to one toroidal coil, in duces a current in the second coil which is directly proportional to the conductance of the solution.

3.3 Sensor identification

Type designation

A sensor can be identified by the article number and the model name on the label located on the cable.

InPro 7250xx/yy/zz xx: Type of sensor

ST = Sensor for temperature up to 100 °C

(212 °F), without EX approval HT = Sensor for temperature up to 180 °C,

(356 °F) with EX approval PFA = Sensor in PFA* for Temperatures up to

125°C (257°F)

yy: type of the integrated temperature sensor zz: cable length

Serial number

The serial number is located on the end of the mounting thread.

Sensor certificate number

The labels located on the sensor cable provide the information about the sensor certifications.

*PFA: Perfluoralkoxy-Copolymer

InPro®7250 Series 17

Figure 1: Sensor identification

3.4 Sensor applications

InPro 7250 ST

This sensor may be used for most routine applications like conductivity measurement in industrial wastewater systems. For applications at higher temperatures and for use in hazardous areas the sensor InPro 7250 HT is the preferred alternative.

InPro 7250 HT

The InPro 7250 Series sensor is suitable for the majority of all electrodeless conductivity applications. Its compact size enables it to be mounted in a multitude of methods, including insertion (flange, bushing), and immersion. Typical applications include salinity and brine measurements, steel pickling, scrubbing towers, ion exchange regeneration, plating baths, rinse water, caustic metal cleaning, and textile measurements in scouring, mercerizing, and carbonizing baths.

InPro 7250 PFA

This sensor is particularly suited for heavy-duty chemical applications such as Oleum (highly concentrated sulfuric acid), as well as applications in the pharmaceutical and biopharmaceutical industry (CIP skids, acid and base concentration).

Notes:

– PEEK is a thermoplastic material with excellent

strength and chemical resistance properties over a wide range of process temperatures and pressures.

– PEEK material displays excellent chemical resis-

tance to most aqueous solutions of acids, bases, and salts. It is also excellent for organic solvents such as toluene, ethyl acetate, acetone, gasoline, and carbon tetrachloride. It is not recommended for sulfuric or nitric acid solutions above 70 %, nor is it recommended for Oleum applications.

– PFA is a type of fluorcarbons with similar properties

as PTFE. PFA is resistant against nearly all chemicals and has a high temperature resistance. The PFA quality used here does not contain glass fibres (virgin PFA).

S

erial number

A

rticle number and

model name

S

ensor

certificate number

18 InPro®7250 Series

4 Installation, operation

and maintenance

4.1 Sensor installation

The sensor shaft is equipped with a conical G3/4" mounting thread. The installation of the sensor is made by threaded bushes or flanges. The process area is sealed perfectly with flat gasket and an O-ring.

Note: When mounted in-line, the sensor should be in stalled centered to avoid pipe wall effects. If there is less than 30 mm (1.18 inch) spacing between sensor and pipe, a product calibration with a sensor built in the process is re commended to meet the specified accuracies.

Figure 2: Sensor overview

Note: Proper installation of the sensor is important for

efficient and accurate operation. For all applications and sensor configurations, mounting arrangements must be located so that: – Sample at the sensing area is representative of the

solution.

– Solution circulates actively and continuously past the

sensing area.

– Position and orientation of the sensor does not trap

air bubbles within sensing area.

– Deposits of sediment or other foreign material do not

accumulate within the sensing area. If cable is in stalled in a conduit (recommended), either flexible conduit should be used or some other provision made for removal of sensor from the process.

Bore

Arrow for the sensor direction

Cable cap

Sensor doughnut

Flat gasket and O-ring for safe process sealing

A

InPro®7250 Series 19

Notes:

–

The sensors of the InPro 7250 Series are marked with

an arrow, which indicates the flat (upstream) face of the sensor, for correct installation in a pipe or a tank. The marking is at the upper end of the sensor mount

ing thread (see Figure 2).

W

arning!

Incorrect O-ring position or a damaged O-ring could result in process leakage, causing injury to personnel.

Figure 3:

Installation examples of the InPro7250 sensor

Air entrapment Solid deposits

Recommended

Not recommended!

20 InPro®7250 Series

4.2. Connection of the sensor

C

able configuration

InPro 7250 ST / PFA InPro 7250 HT

receive hi black red receive lo red yellow send lo brown violet send hi blue black RTD green green R

TD white white RTD sense grey grey shield green/yellow green/yellow

Transmitter connection

The sensors InPro 7250 Series are suitable for connection to the following METTLER TOLEDO transmitters:

M 700(X), Module Cond Ind 7700(X):

«Premium line» transmitter, modular measuring system

M400, Type 1 Cond Ind:

«Advanced Line» transmitter, 4-wire

Note: In order to connect the sensor with the transmitter, please consider the instruction manual of the METTLER TOLEDO transmitter.

4.3 Flange installation

METTLER TOLEDO flanges are used for permanent installations in pipelines and tanks. Flanges are used with electrodeless conductivity sensors in systems using DN50 or 2-inch and larger process piping. Flanges are provided complete with locknut.

Figure 4: Flange installation

Flange with locknut

InPro®7250 Series 21

4.4 Bushing installation

S

upplied METTLER TOLEDO bushings are used for in stallations in pipelines and tanks and are provided complete with locknut.

Figure 5: Bushing installation

4.5 Immersion installation with an InDip 550 Ind

For open tanks or inlet channel the sensor can be installed in an immersion housing InDip 550Ind.

Figure 6: Installation with an immersion housing «InDip 550Ind»

Bushing with locknut

4.6 Sanitary installation

M

ETTLER TOLEDO offers a dairy adapter according to DIN 11851 (DN50) as well as an aseptic adapter DIN 11864-1 (DN50) for the inductive sensors of the InPro 7250 series.

Figure 7: Installation with sanitary adapters

4.7 Disposal

The sensors described in this manual usually cannot be repaired. Their disposal is to the responsability of the user. Sensors contain electronic components (coils, cables) that require special disposal without any health hazard for humans, and with no risk of harm for the environment.

Disposal (Directive 2002/96/EC of January 27, 2003): Please observe the applicable local or national regu lations concerning the disposal of "waste electrical and electronic equipment".

22 InPro®7250 Series

Adapter with

accessories

Locknut

Ringnut

Adapter

5 Product specifications

5.1. Sensor specifications

InPro 7250 ST/HT InPro 7250 PFA

Measuring principle inductive inductive

Sensor data

Measuring range 0…2000 mS/cm 0…2000 mS/cm Measurement ST: ± (0.5 % of meas. ± (0.5% of meas. value deviation value + 25 µS) value + 25 µS) HT: ± (0.5% of meas. value + 1 µS) Cell factor nominal

1

)

2.175 2.30 Transfer ratio 120 120 Temperature sensor Pt 1000 Pt 1000 Temperature response (t90) approx. 5 min approx. 5 min

Ambient conditions

2

)

Process temperature ST: –20 °C…+100 °C –20 °C…+125 °C (general purpose) (–4 °F…+212 °F) (–4…+257 °F) HT: –20 °C…+180 °C (–4…+356 °F) Process temperature ST: – –20 °C…+125 °C (In Ex-classified HT: –20 °C…+130 °C (–4…+257 °F) area installation) (–4…+266 °F) Process ST: max. 8 bar max. 16 bar pressure

3

)

(max. 116 psi) (max. 232 psi) HT: max. 20 bar (max. 290 psi)

Sensor materials

Sensor PEEK PFA (medium wetted) 4) glass-fiber reinforced not glass-filled (GF30) Sensor mounting thread (G 3/4") stainless steel stainless steel O-ring Viton® FEP Flat gasket Viton® PTFE

Cable

Type ST: single coaxial cable simple coaxial cable HT: double coaxial cable Cable jacket ST: PVC PVC HT: silicone Available cable lengths 3, 5 and 10 m 3, 5 and 10 m (9.8, 16.4 (9.8, 16.4 and 32.8 ft) and 32.8 ft)

Approvals and certificates

ATEX ST: – – HT: • • FM ST: – – HT: • • Quality/End control • •

1)

This value depends on the installation. The exact value must be determined with a calibration.

2)

The combination of high pressure, high temperature and/or aggressive process medium reduces the sensor life span.

3)

Depending on the installation.

4)

This material is not FDA listed.

InPro®7250 Series 23

Mettler Toledo InPro 7250 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual