Phenanthroline Spectrophotometric Method Total Iron Analyzer with 0-20mg/L Range and RS-232 4-20mA RS-485 Output for Iron Online Water Quality Analyzer

This method is applicable to wastewater with total iron concentrations within the range of 0–20 mg/L.

• Data retention during abnormal alarms or power outages.
• Touchscreen display and command input.
• Automatic discharge of residual reactants and resumption of operation after power restoration or system reset.

Unique Design: This product features a distinctive design that ensures lower failure rates, reduced maintenance requirements, minimal reagent consumption, and higher cost-effectiveness compared to similar products.

1. Selector Valve Assembly
   • Enables flexible reagent sampling timing and diverse channel configurations.
   • Minimizes dead volume for easy maintenance and extended service life.
2. Micro-Dosing Unit
   • Utilizes a visual photoelectric system for precise reagent measurement, eliminating quantitative errors caused by peristaltic pump tube wear.
   • Achieves accurate micro-dosing with 0.7 mL per dose, significantly reducing reagent usage.
3. Sample Introduction Unit
   • Employs a peristaltic pump with negative pressure suction, creating an air buffer zone between reagents and the pump tube to prevent corrosion.
   • Simplifies and enhances flexibility in reagent mixing.
4. Sealed Digestion Unit
   • Operates under high-temperature and high-pressure conditions to accelerate reactions.
   • Eliminates corrosion risks from volatile gases in open systems.
5. Reagent Tubing
   • Uses imported modified PTFE (polytetrafluoroethylene) transparent tubing with an inner diameter >1.5 mm to minimize clogging by particulate matter in water samples.

The ferric iron (Fe³⁺) in the water sample is reduced to ferrous ions (Fe²⁺) by hydroxylamine. Under the action of a buffer solution, the ferrous ions react with 1,10-phenanthroline to form a colored complex. The analyzer detects this color change, converts the variation into a total iron concentration value, and outputs the result. The amount of colored complex formed corresponds to the total iron content in the sample.