Reference Electrode Series
1. Introduction
Reference electrode is an electrode which has a stable and well-known electrode potential. The high stability of the electrode potential is usually reached by employing a redox system with constant (buffered or saturated) concentrations of each participants of the redox reaction.
Reference electrodes are used to build an electrochemical cell in conjunction with an electrode the potential of which is to be determined. Each electrode represents a half cell; both are required to complete the circuit and measure the unknown potential.
2. Electrode model and main technique parameter
NO. | Model | Name | Electrode resistance ¼ˆkΩ¼‰ | Figure size D×L¼ˆmm¼‰ | Potential difference(with standard calomel electrode) (mV, 25oC) | Salt-bridge solution | Application |
1. | 212 | Calomel electrode (Porous ceramic junction) | ≤10 | 9×160 | ±3 | Saturated KCl solution (or equivalent KCl solution) | Reference electrode (In neutral medium) |
2. | 222 | Calomel electrode (Porous ceramic junction) | ≤10 | 9×90 | ±3 | Reference electrode (In neutral medium) |
3. | 232 | Calomel electrode (Porous ceramic junction) | ≤10 | 9×130 | ±3 | Reference electrode (In neutral medium) |
4. | 801(217) | Double liquid-junction calomel electrode (Porous ceramic junction) | ≤10 | 9×120 | ±3 | Reference electrode (In neutral medium) |
5. | 802 | Calomel electrode (Porous ceramic junction) | ≤10 | 9×140 | ±3 | Reference electrode (In neutral medium) |
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