Silver/Silver Chloride Electrodes

Silver Chloride Reference Electrodes

We manufacture three sizes of silver/silver chloride/0.5M KCL Reference Electrodes to manage cathodic protection systems in reinforced concrete or steel framed buildings. Please note that these electrodes are not suitable for submerged seawater or splash zones where we recommend using our RB15 manganese dioxide reference electrode.

Please take your pick from the selection below to find your required reference electrode based on your required service life and reference electrode size.

Data sheets and installation procedures for the electrodes can be found in the panel on the right of this page. If you order the units without cable tails please follow our instructions to connect your own cable tails.

LD10 Silver/Silver Chloride Electrode

  • Electrode: Silver/Silver Chloride/0.5M KCL
  • Model: LD10
  • Anticipated service life: 30 years
  • Unit dimensions: 80mm long x 10mm diameter
  • Interface >20mm2

The LD10 is a long life silver/silver chloride/0.5M KCL reference electrode for permanent installation in atmospherically exposed concrete structures. It is not suitable for submerged seawater or splash zones where we recommend using our RB15 manganese dioxide reference electrode. The essential components are silver metal, silver chloride, soluble silver ions and chloride ions.

Ag, AgC1(s), C1-, Ag+

A sparingly soluble salt, silver chloride, is in equilibrium with a saturated solution of this salt which precipitates in the course of electrolysis. The reversible electrode reaction consists of silver ions going into solution and then combining with the chloride ions to form silver chloride. Thus its potential is determined by the following reactions:

Ag ↔ Ag+ e-
Ag+ + Cl- ↔ AgC1(s)
Ag+ C1- ↔ AgC1(s) + e-

The potential is dependent on temperature and the concentration of chloride ions in accordance with the following equation:

E=E0-

RT

1n[C1-]

F

Where E0RF and T are the standard potential, gas constant, Faraday Constant and temperature respectively. The reaction has been proved to obey these equations in solutions with pH's of between 0 and 13.5. The potential is however very sensitive to traces of bromide ions which make it more negative.

The electrode element has been prepared by electrolytic precipitation of silver chloride onto silver metal. This has then been embedded in a mortar containing a known concentration of chloride ions and an anti-drying agent. The housing consists of a white nylatron barrel and inserts

Element Type:

Silver/silver chloride

Typical 1.2g pure silver

Potential:

-15mV wrt  saturated calomel electrode (SCE) at 200C

Drift:

 +/-3mV in 24 hours

Typically less than +/- 10mV expected in 20 years

Dimensions:

80mm long x 10mm diameter

Housing:

White nylatron barrel and inserts

Cable:

Raychem cable product code 44A0111-16-6

Expected Life:

More than 30 years at a leakage current of 1µA will result in the loss of 0.7 grams of silver. The functional life of the electrode will most likely to be determined by the life of the associated cables.

 

LD15 Silver/Silver Chloride Electrode

  • Electrode: Silver/Silver Chloride/0.5M KCL
  • Model: LD15
  • Anticipated service life: 30 years
  • Unit size: 75mm long x 15mm diameter

Castle Electrodes LD25 Electrode

The LD15 is a long life silver/silver chloride/0.5M KCL reference electrode for permanent installation in atmospherically exposed concrete structures. It is not suitable for submerged seawater or splash zones where we recommend using our RB15 manganese dioxide reference electrode. The essential components are silver metal, silver chloride, soluble silver ions and chloride ions.

Ag, AgC1(s), C1-, Ag+

A sparingly soluble salt, silver chloride, is in equilibrium with a saturated solution of this salt which precipitates in the course of electrolysis. The reversible electrode reaction consists of silver ions going into solution and then combining with the chloride ions to form silver chloride. Thus its potential is determined by the following reactions:

Ag ↔ Ag+ e-
Ag+ + Cl- ↔ AgC1(s)
Ag+ C1- ↔ AgC1(s) + e-

The potential is dependent on temperature and the concentration of chloride ions in accordance with the following equation:

E=E0-

RT

1n[C1-]

F

Where E0RF and T are the standard potential, gas constant, Faraday Constant and temperature respectively. The reaction has been proved to obey these equations in solutions with pH's of between 0 and 13.5. The potential is however very sensitive to traces of bromide ions which make it more negative.

The electrode element has been prepared by electrolytic precipitation of silver chloride onto silver metal. This has then been embedded in a mortar containing a known concentration of chloride ions and an anti-drying agent. The housing consists of a white nylon barrel, white nylon inserts, and a cable gland rated at IP68.

Element Type:

Silver/silver chloride                                                                                                                                                                                      Typical 1.2g pure silver

Potential:

-15mV wrt  saturated calomel electrode (SCE) at 200C

Drift:

 +/-3mV in 24 hours

Typically less than +/- 10mV expected in 20 years

Dimensions:

85mm long x 15mm diameter

Housing:

White nylatron barrel and inserts with IP68 cable gland

Cable:

  • XLPE/XLPE 2.5mm2
  • XLPE/PVC 2.5mm2

These electrodes can be supplied without cable for cable to be attached on site

Expected Life:

More than 30 years at a leakage current of 1µA will result in the loss of 0.7 grams of silver. The functional life of the electrode will most likely to be determined by the life of the associated cables.

 

LD25 Silver/Silver Chloride Electrode

  • Electrode: Silver/Silver Chloride/0.5M KCL
  • Model: LD25
  • Anticipated service life: 57 years
  • Unit size: 75mm long x 24mm diameter

The LD25 is a long life silver/silver chloride/0.5M KCL reference electrode for permanent installation in atmospherically exposed concrete structures. It is not suitable for submerged seawater or splash zones where we recommend using our RB15 manganese dioxide reference electrode. The essential components are silver metal, silver chloride, soluble silver ions and chloride ions.

Ag, AgC1(s), C1-, Ag+

A sparingly soluble salt, silver chloride, is in equilibrium with a saturated solution of this salt which precipitates in the course of electrolysis. The reversible electrode reaction consists of silver ions going into solution and then combining with the chloride ions to form silver chloride. Thus its potential is determined by the following reactions:

Ag ↔ Ag+ e-
Ag+ + Cl- ↔ AgC1(s)
Ag+ C1- ↔ AgC1(s) + e-

The potential is dependent on temperature and the concentration of chloride ions in accordance with the following equation:

E=E0-

RT

  1n[C1-]

F

Where E0RF and T are the standard potential, gas constant, Faraday Constant and temperature respectively. The reaction has been proved to obey these equations in solutions with pH's of between 0 and 13.5. The potential is however very sensitive to traces of bromide ions which make it more negative.

The electrode element has been prepared by electrolytic precipitation of silver chloride onto silver metal. This has then been embedded in a mortar containing a known concentration of chloride ions and an anti-drying agent. The housing consists of a white nylatron barrel, white nylatron inserts, and a cable gland rated at IP68.

Element Type:

Silver/silver chloride

Typical 3g pure silver

Potential:

-15mV wrt  saturated calomel electrode (SCE) at 200C

Drift:

 +/-3mV in 24 hours

Typically less than +/- 10mV expected in 20 years

Dimensions:

75mm long x 15mm diameter

Housing:

White nylatron barrel and inserts with IP68 cable gland

Cable:

  • XLPE/XLPE 2.5mm2
  • XLPE/PVC 2.5mm2

These electrodes can be supplied without cable for cable to be attached on site.

Expected Life:

More than 50 years at a leakage current of 1µA will result in the loss of 1.0 grams of silver. The functional life of the electrode will most likely to be determined by the life of the associated cables.

 


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