Nonpolarizing electrodes

Dr. Simon Andras's Home page                             

 

Welcome!

I am senior geophysicist, Ph.D. of Earth Sciences. From 1964 to 2005 I had been working at the Eötvös  Lorand Geophysical Institute of Hungary (ELGI), in Budapest. In 2012 ELGI and Geological Institute of Hungary (GIH ) were merged and the new institute was named Geological and Geophysical Institute of Hungary (GGIH). With merging of Hungarian Office for Mining and Geology and the Geological and Geophysical Institute of Hungary in 2017 was established the Mining and Geological Survey of Hungary. 

From 2005 to 2012 I had been working at the ELGI as contractor (geophysicist and quality assurance manager).

In 1995 I started to work as geophysicist-entrepreneur as well. 

• WHAT I DO AS ENTREPRENEUR

Started in 1995 I develope and distribute (in abroad and Hungary) nonpolarizing electrodes PbPbCl (also known as non polarizing electrode, non polarizable electrode, "sensor", E-field probe") of high quality, manufactured by Wolf Ltd Hungary.

NONPOLARIZING ELECTRODES

Nonpolarizing electrodes are used in geoelectrical and electromagnetic surveying especially in magnetotelluric (MT), resistivity, induced polarization (IP) and spontaneous potential (SP) measurements.

Our nonpolarizing electrodes are compatible with many recorder instruments including ADU (Metronix Geophysics), MTU (Phoenix Geophysics), ZEN (Zonge International), Syscal (IRIS Instruments), etc.

On Figure 1. you can see the sketch of our nonpolarizing electrodes.  They are free of potentials caused by electrochemical action between the electrodes and the ground. Their cylindrical body is made of PE, the top of PA. The body is filled up with lead chloride saturated gypsum hard gel and a lead spiral is cemented in it. 

NONPOLARIZING ELECTRODE, MEDIUM (WM) TYPE (Figure 2)
Main features
Self (DC) potential of a couple: a few mV (shortly after manufacture)
Contact+internal resistance of a couple: 100-300 Ohm (shortly after manufacture, on normal ground)
Surface of the bottom: 58 cm²
Mass: about 0,8 kg
Diameter (D): 90 mm
Height (H): 80 mm

NONPOLARIZING ELECTRODE, LONG (WL) TYPE (Figure 2)
Main features
Self (DC) potential of a couple: a few mV (shortly after manufacture)
Contact+internal resistance of a couple: 100-300 Ohm (shortly after manufacture, on normal ground)
Surface of the bottom: 27 cm²
Mass: about 0,5 kg
Diameter (D): 64 mm
Height (H): 90 mm

NONPOLARIZING ELECTRODE, SMALL (WS) TYPE (Figure 2)
Main feataures
Self (DC) potential of a couple: a few mV (shortly after manufacture)
Surface of the bottom: about 7 cm²
Diameter (D): 30 mm
Height (H): 50 mm

This type is advised usually for laboratory measurements.

NONPOLARIZING ELECTRODE, LONG CERAMIC SLAB (WLC) TYPE (Figure 3)
Main fetures
Self (DC) potential of a couple: roughly 10 mV (shortly after manufacture)
Contact+internal resistance of a couple: 100-400 Ohm (shortly after manufacture, on normal ground)
Surface of the cheramic slab at the bottom of electrode: 7 cm²
Mass: about 0.6 kg
Diameter (D): 60 mm
Height (H): 100 mm

The body-block of  this electrode has been manufactured from a monolithic PP rod trough turning, and the holder of the ceramic slab (made of the same material as the block) join the block of the electrode by screw-thread and sealed by O-ring.The cable outlet-body join the block also by screw-tread and sealed by O-rings.

So this electrode is usable in the very wet environment moreover under water until pressure 10 at (for example in wells in depth about 100 m).

Frost tolerant electrodes:

All types can be manufactured as frost tolerant and works properly from minus 20 to plus 50 C degree. The details see in Last developed electrodes.



For all types of the electrodes:

Flat response: from DC to 10 000 Hz

Self-noise level: 0.001 - 0.01 mV .

Temperature effect koefficient for a couple: 0,04-0,2 mV/C^o, using at around 20 C^o, on normal ground (see under results of test measurements, temperature effect)

Working life:

For WM, WL, WS types: 15-20 month (in case of careful using on the ground with normal conditions), not depending on the number of real mesuring days.

For WLC types: 24-36 month (in case of careful using on the ground with normal conditions), not depending on the number of real measuring days.

Connection: insulated copper or tinned copper wire (length 1- 2.5 m or more - according to the order, core 0.75 mm²).
 

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Safety regulations: according to laws and regulations concerning to the manipulations of lead compaunds. Additional information see by clicking Direction for use, transport, storage, maintenance.

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For detailed study of long time behaviour of electrodes see "Results of test measurements; (Long time variation of self potential, resistance. Contact (liquid junction)  and diffusion effect").

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Manufacturer (developer): 

WOLF Chemical Ltd, H-1195 Budapest, Hofherr Albert u. 3-15 
Hungary 
Phone/Fax: (+36 1) 282 8881
Email:wolf@wolf.hu                                                            

www.wolf.hu

Distributor and developer: 

Dr. Simon András senior geophysicist, entrepreneur  H-1221 Budapest, Ringló út 39
Hungary 
Phone: (+36 1) 2261870, Mobile: +36 30 2123517                      Email: simandras@t-online.hu or simandras350@gmail.com    

www.nonpolarizingelectrode.com  

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The direction for use, transport, storage and maintenance of nonpolarizing electrodes (sensors); threatment of waste electrodes you can read by clicking to Direction for use, transport, storage, maintenance.

 Figure 1: The sketch of nonpolarizing electrodes

Figure 2: Nonpolarizing electrodes medium (WM), long (WL), small (WS) types and its carrying containers.

 

Figure 3: Nonpolarizing electrode long chearmic slab (WLC) type.

                                                                                                                                                                   

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PURCHASING INFORMATION

Basic unite prices of the electrodes from 01 January 2023, EURO/piece: medium type 114, long type 103, small type 87, long ceramic slab type 145.*

All type can be manufactured as frost tolerant (to minus 20 degrees). The basic unite prices are with 15 % higher then the related basic prices.

Ordering less then 24 pieces we have to increase the basic unite prices with 10 -15 %.

Orderable minimum quantities: for medium, long and long ceramic slab type 12 pieces, for small type 8 pieces.

We deliver always newly manufactured electrodes. The buyer usually can receive the electrodes at their address within 3-4 weeks after receipt of the order by the distributor.

Please place your order or inquiry directly to email address of the distributor simandras@t-online.hu, or simandras350@gmail.com  or use the "Contact us" above

For sending you a detailed quotation please give by email:

- the delivery address (including zip code), to where the electrodes can be delivered,

- the  invoicing address (including zip code), to where the quote and the invoice can be submitted,

- the type and quantity of the requested electrodes.

* We had to increase the unit prices due to significant increase of prices of import ingredients, subcontractor services. and the obligate increase of the salary of employees.