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PH-Elektroden
#1
Hallo Zusammen!
Weiß jemand, ob PH-Elektroden wirklich nur eine Lebenserwartung von bis zu 3 Jahren haben? Muß meinem Chef <!-- sCry --><img src="{SMILIES_PATH}/icon_cry.gif" alt="Cry" title="Crying or Very sad" /><!-- sCry --> jetzt erklären, dass ich eine neue brauche und in der Gebrauchsanweisung steht die Lebensdauer von 3 Monaten bis 3 Jahren. Unsere Elektrode ist drei Jahre alt. <!-- sTongue --><img src="{SMILIES_PATH}/icon_razz.gif" alt="Tongue" title="Razz" /><!-- sTongue -->
Viele Grüße
Andrea
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#2
Hallo Andrea,

ich bin zwar bestimmt keine Expertin in Sachen pH-Elektroden, aber ich würde sagen, dass Du Deinen Chef mindestens davon überzeugen musst, dass Du eine Ersatzelektrode auflager haben solltest.

Es kommt auf die Bauart der Elektrode an, auf die Pflege, Verschmutzung, ganz allgemein die Behandlung.

Lässt sich das pH-Meter einwandfrei kalibrieren?? Stimmt die Steilheit? Das können Hinweise auf einen Verschleiß/Defekt der Elektrode sein.

In der Gebrauchsanleitung sollte ja auch was zum Reinigen, ggf. Tausch der Elektrolytlösung etc. stehen.

Die Elektroden können bestimmt länger leben als 3 Jahre wenn sie immer gut behandelt und gepflegt werden.



Ich hoffe ich konnte Dir ein wenig helfen!

Liebe Grüße
Saftschubse
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#3
die Dinger sind schon empfindlich und wenn sie eintrocknen, kann es schon mal sein, dass man sie nicht mehr richtig in Gang kriegt. Ich bin auf Indikatorpapier umgestiegen.

Anton
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#4
Danke dür die schnelle Antwort, aber was bitte ist die Steilheit? <!-- sIcon_question: --><img src="{SMILIES_PATH}/icon_question.gif" alt="Icon_question:" title="Question" /><!-- sIcon_question: -->
Gruß Andrea
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#5
Hallo Andrea,

da fragst Du die Richtige.... hier habe ich das folgende gefunden:

Zitat: Die Steilheit (temperaturabhängig) ist ein Maß, wie empfindlich eine Elektrode auf pH-Änderungen reagiert. Die Steilheit S in mV/pH von z.B. einer pH-Elektrode ist das Verhältnis von Spannungsdifferenz bei zwei verschiedenen pH-Werten zur Differenz dieser pH-Werte.

Bei 25°C liegt der theoretisch erreichbare Wert (die Nernstspannung) bei 59,16mV (100%). Zu niedrige Werte deuten auf ein Nachlassen der Elektrodenempfindlichkeit hin und können dann am pH-Messgerät nicht mehr eingestellt werden.


Hilft Dir das??
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#6
danke, man kann nur schlauer werden!
Gruß Andrea
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