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8 Type 465 pH Electrodes
© 04 / 16 Mettler-Toledo GmbH Type 465 pH Electrodes
59 905 937 Printed in Switzerland
Foralltype465combinationpHelectrodestobemounted
intothefollowinghousings:types763,764,776and796.
Werecommendthatthesensormayonlybeinoperation
withtheoriginalaccessoriesfromMETTLERTOLEDO.The
sensor may be operated and serviced only by personnel
familiarwiththeunit,andwhohavereadandunderstood
thisinstructionmanual.
1 Installation
a Whenunpacking,checkelectrodeforpossiblemechanical
damage to the pH sensitive glass, the diaphragm or the
body.Electrodessubjecttocomplaintsmustbereturnedto
usortoouragentintheoriginalboxindicatingtheinvoice
number.
b Takeoffwateringcapandwashtheelectrodetipwithdistilled
water.Afterrinsingwithdistilledwater,dabtheelectrodewith
atissue.Donotrubas anincreaseof theresponsetime
mightresult.
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
insertingtheelectrodeintothehousing.RemoveanyKCl
solutionresidinginthellingport.Re-assemblethehousing
asdescribedintheinstructionforthehousing.
d EliminateanyairbubblestrappedbehindthepHsensitive
glassbysmoothlyswingingtheunitintheverticalplane.
Thelead-offelementoftheglasselectrodemustdipintothe
innerbuffersolutionwithoutairbubbles.
e CombinationpHelectrodesstoreddryforseveraldayshave
tobesoakedintheappropriatestoragesolutionforseveral
hoursbeforeuse.Itisrecommendedtostorecombination
andreferenceelectrodesinthereferenceelectrolytesolution.
f Afteralonganddrystorageperiod,thepHsensitiveglasscan
bereactivatedwithhydrouoricacid(orderno.51319053):
Theelectrodemembraneisdippedfor1min.inthissolution
followed by rinsing with distilled water and soaking for
12hoursinthestoragesolution.
g Checkingelectrolytelevel:Combinationelectrodesofthetype
465containvariouselectrolytes.Forrellingalwaysusethe
typeofelectrolyteindicatedonthebodyoftheelectrode.The
imprint«rell9816»meanstorellwithViscolyt(orderno.
51340235);«rell9848»meanstorellwithFriscolyt-B
(orderno.51340053).
Theliquidlevelofaproperlylledelectrodeisabout1–2cm
belowthellingport.
2 Calibrating of electrode and pH transmitter
Thetransmitteriscalibratedusingtheelectrodeeitherready
formountingoralreadymountedintothehousing.Calibra-
tionismadeintwobuffersolutionsofaknownpHvalueby
dippingtheelectrode intothebufferandadjustingthepH
transmitter.ForfurtherstudiesinpHmeasurementthefollo-
wingbookletisavailablefreeofcharge:«pHTheoryGuide»
(orderno.30078149).Forotherlanguageversionsplease
contactyourMettler-Toledorepresentative.
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 Aftereachmeasuringcycletheelectrodetipandtheliquid
junctionmustbethoroughlyrinsedwithdistilledwater.Under
nocircumstancemusttheelectrodebeallowedtodrywith
measuringsolutioncoatingit.This is very important.
b On storage ofanassembledprobe, tip and liquid juncti-
onmustbeleftfullyimmersedinanalkalineKClsolution
(10partsof3MKClorViscolytplus2partsofbuffersolution
pH9.2).WithouttheadditionofbuffersolutionpH9.2the
housingmaycorrode.
c Theliquidlevelofthereferenceelectrolytemustbechecked
regularly.Ifithassunkbelowthebulbousshaftsectionof
theelectrode,thereferenceelectrolytemustbereplenished.
Attention is drawn to the instructions given in 1.g. above.
d Rapid rise in resistance of reference electrode: A rapid rise
inresistanceofthereferenceelectrode(upto1MΩ)after2
to 3 measuring cycles may occasionally be noticed in media
whicharehighlyenrichedwithproteins.Mosttransmitters
areverysensitivetothisriseinresistance,whichmanifests
itselfthroughadrift.Ifthishappens,theelectrodeshouldbe
treatedwithourelectrodecleaner(orderno.51340068).
Apreventiveaction is tousecombinationelectrodes with
Friscolyt-Breferenceelectrolyte(sufx/9848inproductde-
signation).
e Black diaphragm (liquid junction):If the solution to be
measuredcontainssuldecompounds,theliquidjunction
maybecomeblack.Simultaneously,itsresistancewillrise
signicantly.Suchanelectrodedoesnotworkproperlyany
longerandtreatingwithourdiaphragmcleaner(orderno.
51340070)becomesnecessary.
Apreventivemeasureistheuseofcombinationelectrodest-
tedwithasilver-iontrap(code–SC–inproductdesignation).
4 Cables
Makecertainthattheshieldofthecoaxialcablecarryingthe
reference electrode signal of the combined electrode is
never connected to ground.
CombinationelectrodewithscrewcapS7suitabletocable
socketAS9.
CombinationelectrodewithscrewcapK9suitabletocable
socketAK9.
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38 Type 465 pH Electrodes
© 04 / 16 Mettler-Toledo GmbH Type 465 pH Electrodes
59 905 937 Printed in Switzerland
–
Notes
Type 465 pH Electrodes 39
Type 465 pH Electrodes © 04 / 16 Mettler-Toledo GmbH
Printed in Switzerland 59 905 937
–
Notes
Brazil Mettler-Toledo Ind. e Com. Ltda.
AvenidaTamboré,418–Tamboré,
BR-06460-000Barueri/SP,Brazil
Phone+551141667400
e-mailmettler@mettler.com.br;service@mettler.com.br
France Mettler-Toledo Analyse Industrielle S.A.S.
30,Bld.deDouaumont,FR-75017Paris,France
Phone+33147370600
e-mailmtpro-f@mt.com
Germany Mettler-Toledo GmbH
Prozeßanalytik,Ockerweg3,DE-35396Gießen
Phone+49641507-444
e-mailprozess@mt.com
Switzerland Mettler-Toledo (Schweiz) GmbH
ImLangacher,CH-8606Greifensee
Phone+41449444760
e-mailProSupport.ch@mt.com
United States METTLER TOLEDO
Process Analytics
900MiddlesexTurnpike,Bld.8,Billerica,MA01821,USA
Phone+17813018800
Freephone+18003528763(onlyUSA)
e-mailmtprous@mt.com
FormoreaddressesofMETTLERTOLEDOMarketOrganizationspleasegoto:
www.mt.com/pro-MOs
Mettler-ToledoGmbH,ProcessAnalytics,ImHackacker15,CH-8902Urdorf
Phone+41447296211,Fax+41447296636
Subjecttotechnicalchanges
04/2016©Mettler-ToledoGmbH
PrintedinSwitzerland.59905937 www.mt.com/pro
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Mettler Toledo pH electrodes type 465 Operating instructions
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