Compact online analyzer for continuous sulfide ion measurement

The ECD CA900 Sulfide Ion Analyzer is an all-in-one analyzer for continuous measurement of sulfide ions in aqueous media. Sulfide is present in well water, municipal wastewater, and wastewaters from refineries, tanneries, chemical plants, and paper and pulp facilities.

The CA900 uses a sulfide ion selective electrode (ISE) to measure total sulfide in the sample. Potassium hydroxide raises the sample pH to around 13 for the sulfide measurement, then the sample is neutralized with hydrochloric acid to a safe pH near 8.

• Measurement range: 0.02 – 500 mg/L (0.02 – 500 ppm)
• Principle of operation: Sequential sampling, sulfide ISE, pH-compensated measurement, sample neutralization
• Cycle response time: 6, 12, or 30 minutes, user selectable
• Accuracy: +/- 20 ppb or 5% of reading, whichever is greater
• Repeatability: +/- 2% of reading
• Outputs: Four 4-20 mA outputs
• Alarms: Four configurable relays, SPDT 15A 250VAC

The compact measurement system conditions the sample, measures sulfide, neutralizes the sample, measures pH, drains, and rinses the cell. The touchscreen interface provides user-friendly menus and configuration access.