Field Measurements 5:2
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Comparison of Potential Values of Typical Reference
Electrodes vs. Copper-Copper Sulfate Reference Electrode
Relative electrode values are shown in Table 5.1.
Table 5.1 Relative Values of Typical Reference Electrodes to Copper-Copper
Sulfate Reference Electrode
Electrode (Half-Cell) * Potential (Volt)
Copper-Copper Sulfate 0.000
Silver-Silver Chloride (saturated)
Saturated Calomel
–0.050
–0.070
Hydrogen (SHE) –0.320
Zinc –1.100
*Electrode used under standard conditions (from RP0169)
Stationary reference electrodes
A stationary copper-copper sulfate reference electrode is used for
installation underground. These electrodes are used to reduce IR drop in
potential measurements at inaccessible locations. Figure 5.1 shows a
stationary CSE unit.
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