CHI152 Alkaline/Mercury Oxide Reference Electrode
Brand: CH Instruments | Category: Nanotechnology
Built as Hg/HgO/1M NaOH, the CHI152 is the reference electrode CH Instruments publish for highly alkaline electrolytes, quoted at 0.098 V against NHE at 25 C for HgO + H2O + 2e = Hg + 2OH-. Its outer body is Teflon, which CH Instruments state keeps it strong in high alkaline solution, and users may swap the 1M NaOH for 6M NaOH or 6M KOH provided the concentration stays at or below 6M. The chamber ships filled with distilled water for transport safety and must be refilled before first use, and the published drawing gives an 11 to 15 mm diameter head 40 to 45 mm long over a 6.4 mm diameter stem 60 to 65 mm long ending in a white ceramic junction.
Selected manufacturer specifications
| Parameter | Value |
|---|---|
| Reference system | Hg/HgO in 1 M NaOH |
| Published reference potential | 0.098 V versus NHE at 25 °C |
| Body material | Teflon |
The stated potential applies to the specified 1 M NaOH reference system; changing the electrolyte changes the reference conditions. Follow the manufacturer’s preparation, compatibility and handling instructions. Checked 2026-09-29.
Manufacturer reference document (opens in a new tab)
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