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.
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CHI172-xxx is the generic ordering code for a set of electrode leads, where xxx is replaced by the instrument model number, for example 600 or 710B. CH Instruments publish one photograph for the CHI172 electrode leads covering the family. Separate part numbers exist where a particular series needs its own lead set.
The CHI151 is the mercury / mercurous sulfate reference electrode in the CH Instruments range, running on Hg2SO4 + 2e = 2Hg + SO4 2- at a published 0.64 V against NHE at 25 C. Saturated K2SO4 is the filling solution and a ceramic liquid junction carries the contact, with the published drawing showing a 9.0 mm diameter chamber 37 mm long above a 5.3 mm diameter stem 50 mm long. CH Instruments direct users to refill with saturated K2SO4 and to store the electrode standing in the same solution.
This is the electrode lead set CH Instruments list for CHI1000 Series model numbers. It is one of four series specific variants of the CHI172 lead family, the others covering the CHI1000A, the CHI1000B and the CHI684 multiplexer.