ZDL-9C Automatic Sulfur Determinator

Working Principle:

The test sample is combusted at a high temperature of 1050°C in a purified air stream. Various forms of sulfur in the coal are decomposed through combustion and carried by the air stream into the electrolytic cell, where they combine with water to form H₂SO₃. Since this disrupts the dynamic equilibrium of the original iodine-iodide pair in the electrolytic cell, the instrument immediately outputs an electric current to electrolyze the solution and generate iodine, thereby restoring the original dynamic equilibrium—a process known as coulometric titration as specified in GB/T 214-1996. The amount of current consumed to restore the original dynamic equilibrium is related to the sulfur decomposed from the test sample during combustion, which is measured and calculated by the microprocessor.

Compared to other sulfur analyzers, this instrument offers the following features:

[1] User-friendly interface, easy to operate, learn, and use.

[2] Furnace temperature is controlled using PID mode to regulate furnace current, ensuring high temperature control accuracy and effectively protecting the silicon carbide tube, thereby extending its service life.

[3] Furnace temperature settings and corrections can be directly input and modified via the screen.

[4] Automatic control of electrolysis on/off prevents over-electrolysis due to incorrect startup or shutdown sequences.

[5] During testing, furnace temperature, furnace current, indicator voltage, process time, and sulfur content can be viewed at any time, making the testing process clear and transparent.

[6] Automatic determination of the titration endpoint shortens experimental time and improves work efficiency.

[7] Input moisture value to calculate and print dry-basis sulfur content.

[8] Stores 40 historical records, which can be printed at any time.

Technical Parameters:

[1] Total sulfur measurement range: 0-40%

[2] Sample combustion and analysis time: 3-8 minutes; automatically determines the titration endpoint and returns.

[3] Temperature control: 500-1150°C, controllable within ±3°C. Temperature measurement: accuracy class 0.5; heating element is a silicon carbide tube, with a high-temperature zone length of 90 mm and temperature of 1050°C ±5°C (adjustable as needed).

[4] Heating rate: 25-30°C/min, reaching 1200°C in approximately 35 minutes.

[5] Electrolytic cell: capacity of 450 ml, with platinum electrodes.

[6] Instrument stability: stabilizes within 1 minute after startup.

[7] Rated power supply: 220V ±20%       50Hz.