Mettler Toledo 465 Serie Operating instructions

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8 Type 465 pH Electrodes

59 905 937 Printed in Switzerland

Foralltype465combinationpHelectrodestobemounted

intothefollowinghousings:types763,764,776and796.

Werecommendthatthesensormayonlybeinoperation

withtheoriginalaccessoriesfromMETTLERTOLEDO.The

sensor may be operated and serviced only by personnel

familiarwiththeunit,andwhohavereadandunderstood

thisinstructionmanual.

1 Installation

 a Whenunpacking,checkelectrodeforpossiblemechanical

damage to the pH sensitive glass, the diaphragm or the

body.Electrodessubjecttocomplaintsmustbereturnedto

usortoouragentintheoriginalboxindicatingtheinvoice

number.

 b Takeoffwateringcapandwashtheelectrodetipwithdistilled

water.Afterrinsingwithdistilledwater,dabtheelectrodewith

atissue.Donotrubas anincreaseof theresponsetime

mightresult.

c Important: Reference electrolyte ller tube:The T-shaped

rubber stopper as well as the elastic securing band ha-

ve to be removed completely from the electrode,before

insertingtheelectrodeintothehousing.RemoveanyKCl

solutionresidinginthellingport.Re-assemblethehousing

asdescribedintheinstructionforthehousing.

 d EliminateanyairbubblestrappedbehindthepHsensitive

glassbysmoothlyswingingtheunitintheverticalplane.

Thelead-offelementoftheglasselectrodemustdipintothe

innerbuffersolutionwithoutairbubbles.

 e CombinationpHelectrodesstoreddryforseveraldayshave

tobesoakedintheappropriatestoragesolutionforseveral

hoursbeforeuse.Itisrecommendedtostorecombination

andreferenceelectrodesinthereferenceelectrolytesolution.

 f Afteralonganddrystorageperiod,thepHsensitiveglasscan

bereactivatedwithhydrouoricacid(orderno.51319053):

Theelectrodemembraneisdippedfor1min.inthissolution

followed by rinsing with distilled water and soaking for

12hoursinthestoragesolution.

 g Checkingelectrolytelevel:Combinationelectrodesofthetype

465containvariouselectrolytes.Forrellingalwaysusethe

typeofelectrolyteindicatedonthebodyoftheelectrode.The

imprint«rell9816»meanstorellwithViscolyt(orderno.

51340235);«rell9848»meanstorellwithFriscolyt-B

(orderno.51340053).

Theliquidlevelofaproperlylledelectrodeisabout1–2cm

belowthellingport.

2 Calibrating of electrode and pH transmitter

Thetransmitteriscalibratedusingtheelectrodeeitherready

formountingoralreadymountedintothehousing.Calibra-

tionismadeintwobuffersolutionsofaknownpHvalueby

dippingtheelectrode intothebufferandadjustingthepH

transmitter.ForfurtherstudiesinpHmeasurementthefollo-

wingbookletisavailablefreeofcharge:«pHTheoryGuide»

(orderno.30078149).Forotherlanguageversionsplease

contactyourMettler-Toledorepresentative.

en

en Instruction manual

General instructions

For all type 465 combination pH electrodes

Type 465 pH Electrodes 9

Type 465 pH Electrodes © 04 / 16 Mettler-Toledo GmbH

Printed in Switzerland 59 905 937

en

3 Maintenance

 a Aftereachmeasuringcycletheelectrodetipandtheliquid

junctionmustbethoroughlyrinsedwithdistilledwater.Under

nocircumstancemusttheelectrodebeallowedtodrywith

measuringsolutioncoatingit.This is very important.

 b On storage ofanassembledprobe, tip and liquid juncti-

onmustbeleftfullyimmersedinanalkalineKClsolution

(10partsof3MKClorViscolytplus2partsofbuffersolution

pH9.2).WithouttheadditionofbuffersolutionpH9.2the

housingmaycorrode.

 c Theliquidlevelofthereferenceelectrolytemustbechecked

regularly.Ifithassunkbelowthebulbousshaftsectionof

theelectrode,thereferenceelectrolytemustbereplenished.

Attention is drawn to the instructions given in 1.g. above.

d Rapid rise in resistance of reference electrode: A rapid rise

inresistanceofthereferenceelectrode(upto1MΩ)after2

to 3 measuring cycles may occasionally be noticed in media

whicharehighlyenrichedwithproteins.Mosttransmitters

areverysensitivetothisriseinresistance,whichmanifests

itselfthroughadrift.Ifthishappens,theelectrodeshouldbe

treatedwithourelectrodecleaner(orderno.51340068).

Apreventiveaction is tousecombinationelectrodes with

Friscolyt-Breferenceelectrolyte(sufx/9848inproductde-

signation).

e Black diaphragm (liquid junction):If the solution to be

measuredcontainssuldecompounds,theliquidjunction

maybecomeblack.Simultaneously,itsresistancewillrise

signicantly.Suchanelectrodedoesnotworkproperlyany

longerandtreatingwithourdiaphragmcleaner(orderno.

51340070)becomesnecessary.

Apreventivemeasureistheuseofcombinationelectrodest-

tedwithasilver-iontrap(code–SC–inproductdesignation).

4 Cables

Makecertainthattheshieldofthecoaxialcablecarryingthe

reference electrode signal of the combined electrode is

never connected to ground.

CombinationelectrodewithscrewcapS7suitabletocable

socketAS9.

CombinationelectrodewithscrewcapK9suitabletocable

socketAK9.

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38 Type 465 pH Electrodes

59 905 937 Printed in Switzerland

–

Notes

Type 465 pH Electrodes 39

Printed in Switzerland 59 905 937

–

Notes

Brazil Mettler-Toledo Ind. e Com. Ltda.

 AvenidaTamboré,418–Tamboré,

 BR-06460-000Barueri/SP,Brazil

 Phone+551141667400

 e-mailmettler@mettler.com.br;service@mettler.com.br

France Mettler-Toledo Analyse Industrielle S.A.S.

 30,Bld.deDouaumont,FR-75017Paris,France

 Phone+33147370600

 e-mailmtpro-f@mt.com

Germany Mettler-Toledo GmbH

 Prozeßanalytik,Ockerweg3,DE-35396Gießen

 Phone+49641507-444

 e-mailprozess@mt.com

Switzerland Mettler-Toledo (Schweiz) GmbH

 ImLangacher,CH-8606Greifensee

 Phone+41449444760

 e-mailProSupport.ch@mt.com

United States METTLER TOLEDO

Process Analytics

 900MiddlesexTurnpike,Bld.8,Billerica,MA01821,USA

 Phone+17813018800

 Freephone+18003528763(onlyUSA)

 e-mailmtprous@mt.com

FormoreaddressesofMETTLERTOLEDOMarketOrganizationspleasegoto:

www.mt.com/pro-MOs

Mettler-ToledoGmbH,ProcessAnalytics,ImHackacker15,CH-8902Urdorf

Phone+41447296211,Fax+41447296636

Subjecttotechnicalchanges

PrintedinSwitzerland.59905937 www.mt.com/pro

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