The HI4115 is a combination electrode for measuring silver (Ag⁺) and sulfide (S²⁻). The electrode contains both the measuring and reference electrode in one body. The reference is a silver/silver chloride (Ag/AgCl) electrode and the sensor uses a silver/sulfide membrane. The body is made of durable PEI plastic and is filled with potassium nitrate electrolyte.
It has a cone-style junction, which provides a stable reference potential and a steady flow of electrolyte into the sample. The electrolyte can be easily emptied and refilled from the top of the electrode.
The HI4115 measures silver from 1 µM to 1 M and sulfide from 0.1 µM to 1 M. For accurate measurements, keep the ionic strength constant using an ISA solution for silver and a SAOB buffer for sulfide. SAOB keeps the pH above 12 and prevents sulfide oxidation, ensuring stable results.
Specifications
| Code | HI4115 |
| Type | 1.0 M to 1 × 10⁻⁶ M, 107900 to 0.11 ppm |
| Measurement range Ag | 1.0 M to 1 × 10⁻⁶ M, 107900 to 0.11 ppm |
| Measurement range S | 1.0 M to 1 × 10⁻⁷ M, 32100 to 0.003 ppm |
| Optimal pH range Ag | 2 to 8 |
| Optimal pH range S | 12 to 14 |
| Temperature range | 0 to 80 °C |
| Average deviation Ag | +56 Ag+ |
| Average deviation S | -28 S |
| Housing outer diameter | 12 mm |
| Immersion length | 120 mm |
| Housing material | PEI |
| Cable | 1 m coaxial |
| Connector | BNC |
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