Permanent Ag/AgCl Reference Electrode For Soil

For direct installation into moist soils, or in dry areas to be installed prepackaged in Gypsum / Bentonite backfill.

The silver/silver chloride (Ag/AgCl) elements in all electrodes are manufactured using a “unique” and advanced technique that results in a porous silver matrix. The matrix is then coated with precise quantities of silver/chloride to ensure:

1). High Reliability;
2). High Stability;
3). Greater Accuracy;
4). Increased Life Performance.

Note:

The WE200 reference electrode consists of a highly stable silver/silver chloride element enclosed in an acetal housing and surrounded by a solid electrolyte (with 0.5M chloride ion concentration), an enlarged micro porous ceramic plug allows contact with the electrolyte and ionic conduction.

These electrodes can be directly installed into moist soil but in dry soils the electrode impedance and that can be very high in relation to the impedance of the measuring circuit. Thus, it would be essential that the reference electrode is bagged in a conductive backfill i.e. bentonite, gypsum and sodium sulphate and the measuring circuit has a high impedance, preferably 30MegOhm or greater.

OUTER CASING

MATERIAL : Acetal body with porous ceramic cylinder and nylon cable gland

DIMENSIONS : Length: 260mm (283mm w/ gland); Diameter: 35mm

CERAMIC CYLINDER DIAMETER: 19mm

WEIGHT (W/O CABLE) : 400g

SILVER CHLORIDE ELEMENT

MATERIALS : Silver compounds are 99.90% pure

DIMENSIONS : Length: 50mm (+/- 2mm); Section: 5mm x 5mm

SURFACE AREA : Geometric: 10cm2; Real: 500cm2

ELECTROLYTE : Inert electrolyte with 0.5 Molar KCl

PERFORMANCE DATA

STABILITY (POTENTIAL DRIFT AT CONSTANT TEMP AND ENVIRONMENT): +/- 1mV (24 Hrs) @ 5μA load