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