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AccuRef silver/silver chloride electrodes are not subject to contamination even in high chloride ion content soil due to the use of saturated KCI in the filling solution. The electrode potential is in the range 240mv +10mV versus SHE @ 25°C, rather than around 200mV versus SHE @ 25°C, as a consequence of the additives included in the filling solution. The additives are responsible for the strongly-hygroscopic nature of the electrodes (they do not dry out even in very dry soil conditions and for the depressed freezing temperature (-20°C).
If necessary, readings taken with AccuRef electrodes can be adjusted to either the accepted saturated silver/silver chloride potential or to the accepted copper/saturated copper sulfate solution electrode potential, based on the calibrated electrode potentials associated with the AccuRef electrodes (averaging around 240mV versus SHE, typically).
AccuRef 60 Contains:
· 8G of high purity Ag (99.99% pure). Diameter: 2.77 in
· 2g of high purity AgCL (99.99% pure). Length: 15 in
· 500mL of KCI solution. Weight: 3.9 lbs
AccuRef 20 contains:
· 3g of high purity Ag(99.99% pure). Diameter: 2.77 in
· 0.75g of high purity AgCL (99.99% pure). Length: 11 in
· 200mL of KCI solution. Weight: 1.9 lbs
Features:
· Electrode: Permanent Silver/SilverChloride Electrode.
· Applications: Direct burial in soil, with or without chloride ion contamination.
· Low Freezing Point: -20°C.
· Design Life: 20 years.
· High Purity: Ag/AgCL, calcium chloride and triple de-ionized H20.
· Cost: Less expensive than most Silver Chloride permanent electrodes.
· Tip: Moisture absorbent ceramic tip.
· Evaporation: Will not dry out a low humidity and/or high heat.
· Wire: 25 feet of AWG 12 lead wire; cross-linked Polyethylene jacket, direct burial, low leakage, 600V, 90°C.Rating, Use-12/RHH/RHW-2. Longer lengths of wire are available.
· Electrical Contact Surface Area: Approx. 16.4 square inches (a cylindrical surface, 1.5 inches in diameter and 3.5 inches in length).
