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borna godaz

manufacturer of cathodic protection anodes

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Zinc Reference Electrode

Monday, 14 May 2018 00:00
  • Reference electrodes

The potential of underground pipelines and buried installations in soil or immersed in water is measured relative to reference electrodes (hallfcells). Reference electrodes are divided into three main categories depend on application such as: oil, gas and petrochemica and marine:

v Copper / Copper sulfate reference electrode (portable & permanent) for using in soils including Cl-

v Zinc / Zinc sulfate reference electrode (portable & permanent) for using in soils including Cl-

v Silver / Silver chloride reference electrode (portable & permanent) for using in marine environments

v Zinc Reference electrode for using in marine environment

The potential difference of different reference electrodes relation to hydrogen standard electrode at 25 ° C is as follows According to BS 7361:

 

Electrode potential (V)
Cu/CuSO4 +0.32
Ag/AgCl/KCl saturated +0.2
Ag/AgCl/Seawater +0.25
Calomel/KCl saturated +0.25
Zn/Seawater -0.78

 

 

  • Zinc reference electrodes

Perhaps using a metal reference electrode does not seem logical with aim of measuring potential differences in direct contact with electrolyte around the structure, While Zinc reference electrode is suitable for many applications specially in sea water. This reference electrode is more economical than Ag/AgCl reference electrode. So it can be used instead of Ag/AgCl electrode unless a high degree of stability is required.
high purity zinc ingot (at least 99.9% Zinc with 0.0014% iron as maximum content) is used in manufacture of zinc reference electrodes. KYNAR cable (HMWPE/PVDF) is used as a resistant material to chloride and sulfate ion for connection with a cross-section of 10 mm2 or 16 mm2. Also, this cable is welded to steel core inside the electrode. The connection point between the copper cable and steel rod is coated with epoxy resin. It should be noted that accuracy of the potential measurement by using Ag/AgCl electrode in sea water is about ± 5 mV while it is about ± 30 mV by using Zinc reference electrode in sea water
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 Zinc reference electrodes bornagodaz.jpg

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02156233930-02156233929
02156232587-02156236590
02156230236
 Info@bornagodaz.com
Tehran Province, Shamsabad Industrial City, Golbarg Number 2

     

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Bornagodaz

BORNA Godaz Company was established on the path of development of BORNA Electronic activities in the field of cathodic protection in 2004. ...

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