Product category:
Liquid Analysis: pH, Conductivity, ISE
News Release from: Jumo Instrument Company | Subject: Jumo tecLine
Edited by the Processingtalk Editorial
Team on 08 October 2004
tecLine - pH electrodes with a solid
electrolyte
Jumo has developed a new pH electrode especially for applications in heavily polluted media, emulsions, dispersions, or for use in media containing proteins and sulphides
pH sensors are frequently subjected to a considerable amount of continuous stress in industrial measurement technology In such situations, the user needs reliable sensors of high quality
This article was originally published on Processingtalk on 20 May 2004 at 8.00am (UK)
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For more than 30 years, Jumo have been manufacturing electrochemical sensors that testify their quality and Jumo expertise day in and day out.
Jumo has developed a new electrode especially for applications in heavily polluted media, emulsions, dispersions, or for use in media containing proteins and sulphides, as an alternative to electrodes incorporating a ceramic or PTFE diaphragm, also for heavily contaminated municipal or industrial wastewater.
The electrodes use a polymer-based solid electrolyte.
Further reading
High resistance platinum chip temperature sensors
With the higher resistance of Jumo PT 2000 and PT 5000 sensors, a greater resolution can be achieved since changes in temperature can be better tracked by the measuring or control equipment
Bimetal temperature switches with slow-action
Jumo has expanded its range of bimetal temperature switches: in addition to the versions with a snap-action contact, models with a slow-action contact are now available
In addition, they feature an annular gap diaphragm that is characterised by a high degree of immunity to interference.
The annular gap construction and use of a solid electrolyte ensure that the diaphragm cannot become clogged.
The measurement remains stable over a lengthy period, even in heavily polluted media.
For application in general aqueous solutions (swimming pool monitoring, drinking water treatment, aqueous media without any dirt charges, media containing few ions), pH sensors with gel filling and ceramic diaphragm can continue to be used.
As a result of the direct contact between the electrolyte and the medium, an increased thinning effect has to be expected in such media with solid-electrolyte electrodes, which would considerably reduce the operational life of the electrode.
The solid electrolyte is free from silver chloride, which makes it insensitive to sulphide ions.
Black diaphragms associated with it are now a thing of the past.
In order to increase the operational life of the electrode, the electrolyte has additionally been provided with solid potassium chloride (KCl) that is finely distributed in the gel.
As a result, the usage of the electrode can be recognised by the electrolyte clearing up.
The Jumo Ag/AgCl conductive system - tried and tested for many years - is used as a reference system.
The solid electrolyte securely encloses the reference system.
The trusted Jumo U glass permits operation at temperatures ranging from -5 to +80C.
The electrode withstands pressures in the range up to 6 bar.
If requested, a Pt100 or Pt1000 temperature probe can be integrated.
The electrodes can be installed in existing fittings via a Pg13.5 gland.
The new solid-electrolyte electrodes are distinguished by low maintenance and long life.
They ensure that pH measurement in heavily polluted media can now be performed economically.
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