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Cu/CuSO₄ reference electrodes

The maintenance and control of cathodic protection systems requires a reliable reference electrode. Our reference electrodes have a number of favorable features as the suitable porosity of the ceramic body and the special filling material assuring very long lifetime and stable potential.

Main parameters of RÉZ-1 type:

Expected lifetime: 15 years

Application fields: permanent deposition, controlling of automatic CP-station, active drainage (in the presence of varying stray current sources).

*Measured against the standard hydrogen electrode

Main parameters of RÉZ-3 type:

Expected lifetime: 15 years

Application fields: permanent deposition for system control.

*Measured against the standard hydrogen electrode

Deposition of the electrodes

Permanently deposited electrodes have to be laid near to the cathodically protected objects, e.g. oil or gas steel pipes. The distance between the pipe and the electrode must be about 10 cm (4 in), but the electrode should not be in contact with the pipe. In desert soils a vertically placed plastic pipe (diameter 2-3 in.) perforated at the bottom has to be placed beside the electrode and ca. 10 l water should be poured onto the area of the electrode through the pipe every 3 month. In case of a continuously working automatic CP control system the pilot electrode should be embedded in about 20-40 kg (44-88 lb) bentonite (the upper limit refers to very dry soils) and it has to be watered regularly through the plastic pipe. This way the electrodes can be used for a long time.

Quotation (valid to year 2015):

The quotations do not contain the cost of transportation.

VEKOR manufactured RÉZ-4AE reference electrode

When stray current cannot cut off on the steel structure, then potential of the pipeline can be measured only with the widespread auxiliary electrode method. The theory of this method is a suppose. If an auxiliary electrode (piece of a steel) made of the pipe’s material is connected to the pipe, then the potential of this auxiliary electrode demonstrates the effective functioning of the protection at a given point. The stray current can be ended if we disconnect the metal connection between the pipe and the auxiliary electrode, thus the switch-off potential of the electrode can be measured.

The electrodes are installed with 3 m long three-wire copper cable. There is a different wire for potential measuring, and other two wires connect to the auxiliary electrode. One of these two wires can be used for current measuring with ammeter shunt inserted, other can be used for low resistance connection to the auxiliary electrode.

At installation, before burying, carefully covering of auxiliary electrode with soil is practical.

	Diameter	90 mm (3.54 in.)
	Height	250 mm (9.8 in.)
	Weight	2.4–2.5 kg (5.3–5.5 lb.)
	Expected lifetime	15 years
	Material of Auxiliary Electrode	L485 steel
	Potential	316±10 mV
	Max. load	30 µA
	Thermal coeff.	0.8 mV/K
	Potential set-up time	20–30 min.
	Surface of Auxiliary Electrode	10 cm2

Application fields: control measuring with auxiliary electrode.

Quotation: 125 €/pcs.
The quotation does not contain the cost of transportation
The quotation is valid for December 31, 2015.

VEKOR manufactured RézAE2 reference electrode

When stray current cannot cut off on the steel structure, then potential of the pipeline can be measured only with the widespread auxiliary electrode method. The theory of this method is a suppose. If an auxiliary electrode (piece of a steel) made of the pipe’s material is connected to the pipe, then the potential of this auxiliary electrode demonstrates the effective functioning of the protection at a given point. The stray current can be ended if we disconnect the metal connection between the pipe and the auxiliary electrode, thus the switch-off potential of the electrode can be measured. The protection can be evaluated better, if the formed protective current free and stray current free structural potential of the steel structure is known at the given point at the moment of the measuring. For modeling this, one more iron piece (non connected to the protected structure) is located on the reference electrode.

The electrodes are installed with 5 m long five-wire copper cable. There is a different wire for potential measuring, and other two-two wires connect to the auxiliary electrode. One of these two wires can be used for current measuring with ammeter shunt inserted, other can be used for low resistance connection to the auxiliary electrode.

At installation, before burying, carefully covering of auxiliary electrode with soil is practical.

	Diameter	90 mm (3.54 in.)
	Height	250 mm (9.8 in.)
	Weight	2.4–2.5 kg (5.3–5.5 lb.)
	Expected lifetime	15 years
	Material of Auxiliary Electrodes	L485 steel
	Potential	316±10 mV
	Max. load	30 µA
	Thermal coeff.	0.8 mV/K
	Potential set-up time	20–30 min.
	Surface of Auxiliary Electrodes	10 cm2 and 1 cm2

Application fields: control measuring with auxiliary electrode.

Quotation: 145 €/pcs.
The quotation does not contain the cost of transportation
The quotation is valid for December 31, 2015.

VEKOR manufactured RÉZ-6 reference electrode

This reference electrodes (which also can be used for calibration) have a number of favorable features like suitable porosity specially lathe-worked poplar bung and special filling material assuring very long lifetime and stable potential.

Main parameters of RÉZ-6 type:

	diameter:	40 mm (1.6 in.)	potential	312±2 mV
	height:	200 mm (7.9 in.)	maximum load	max. 3 µA
	weight:	0.5 kg (1.1 lb.)	thermal coefficient	0.8 mV/K
	application fields:	calibration of built-in reference electrodes, CIPS measuring
	electrode	body:	PVC pipe
		diaphragm:	poplar bung
		connection:	copper sleeve
		filling:	special, moisture-holding mass

Quotation: 68 €/pcs.
The quotation does not contain the cost of transportation
The quotation is valid for December 31, 2013.

Main parameters of RÉZ-7 type:

	There is claim for portable easy to use reference soil-electrodes beside other produced electrodes. The high purity copper-electrode diving into saturated copper-sulphate solution does not change its natural potential due to favourable high surface. The body of reference electrode is made of transparent plastic. Porosity of ceramic diaphragm is set as causes the smallest resistance in the measuring circuit but keeps the solution in. The incidental minimal dribble is stopped by cap. The solution witch is sold out can be renewable at maintenance through the filler. The measuring line can be connected by banana jack to the copper connector.
	diameter	100 mm (3.9 in.)	potential	316±5 mV
	height	60 mm (2.4 in.)	max load	max. 25 µA
	weight	1 kg (2.2 lb.)	thermal coeff.	0.8 mV/K
	expected lifetime	15 years	potential set-up time	5 min
	application fields	Calibrating of installed long life reference electrodes.
	Quotation: 200 €/pcs. The quotation does not contain the cost of transportation The quotation is valid for December 31, 2015.

Main parameters of RÉZ-8 type:

Beside the long lifetime and high stability reference electrodes a more simple and cheaper one is also needed. The new Réz-8 type has a plastic body and an appropriate porosity ceramic disc guaranties the contact with the soil. Special content load which is also used in more expensive electrodes gives long life operation and stable potential. The electrodes are installed with 3 m long MKH 4 mm² type copper cable. On request the cable can be longer.

Quotation: 56 €/pcs, the price does not contain tax.

The quotation is valid for December 31, 2013.

Auxiliary electrode for reference electrodes

Commissioning and controlling cathodic protection, application of reliable reference electrodes are needed. When stray current cannot cut off on the steel structure, then potential of the pipeline can be measured only with the widespread “Pritula” method.

The theory of this method is a suppose. If an auxiliary electrode (piece of a steel) made of the pipe’s material is connected to the pipe, then the potential of this auxiliary electrode models the potential of the structure formed on the coating fault location. The stray current can be ended if we disconnect the metal connection between the pipe and the auxiliary electrode, thus the switch-off potential of the electrode can be measured. In the practice, this is equal to the potential of the protected structure, thus cathodic protection can be evaluated.

Vekor Ltd. has been producing auxiliary electrodes for reference electrodes. This small, known surfaced steel sample can be stuck to the surface of the pipe, and can applied well for the “Pritula” method.

Technical data of the auxiliary electrode:

Quotation: 30 €/pcs.
(The price does not contain tax. The quotation is valid for December 31, 2013.)

VEREX Paste

CLEANING AND PASSIVATING COMPOSITION FOR AUSTENITIC STAINLESS STEELS

VEREX is a cleaning paste for removal of metallic and iron oxide impurities from austenitic stainless steel surfaces. After the cleaning the surface is in passiv state.

VEREX-49 - for steel surfaces

Registration number: 2571 OTH

VEREX-F21 FORTE - for welded seams

Registration number 2571 OTH

VEREX diminishes the corrosion danger by degreasing, descaling, cleaning and passivating in one step.

The prices are valid for 2013.