High quality Karl Fischer titrators,trace moisture tester, oil water ppm tester,coulometric volumetric karl fischer mois

 

●Utilizing 32 bit embedded microcontroller processor as the master control core and embedded mini operating system.

●Be stable and reliable because of constant pressure detection, high precision and rapid measuring speed.

●Simple operation and convenient digital calculation due to color touch screen and full digital keyboard.

●Four calculation formulas are included, which can meet the different requirement of customer.

●Miniature thermal printer with time record make searching more convenient.

● New profile is designed according to the ergonomics.

●Creative and optimal operating software will bring a different touch experience for you.

 

Working principle

The equation of Karl Fischer reagent and water is as following:

I2 + SO2 + 3C5 H5 N + H2O -→ 2C5 H5 N•HI + C5 H5 N•SO3 .................. (1)

C5 H5 N•SO3 + CH3OH -→ C5 H5 N•HSO4CH3 ................................. (2)

All the reagent solution used is mixed by dominant iodine and pyridine & methanol that filled with sulfur dioxide. The iodine is formed in anode through electrolysis, which is proportional to the quantity of electric charge as per Faraday's law and can be shown as the below formula.

2I¯+ 2e -→ I2 ............................................................ (3)

From formula (1), the mole number of iodine participated in reaction is same as that of water. The moisture will take part in reaction immediately after the sample was injected into electrolyte solution, the consumption of iodine during reaction can be reflected by this instrument, moreover, consumption of iodine can be calculated according to the using quantity of electricity and the moisture amount will be shown in the LCD screen directly. Electrolytic current automatic control system is adopted in this instrument and the size of electrolytic current can be automatically controlled as per the quantity of moisture in sample, which can reach at 400mA. During the process of electrolytic, the moisture will be decreased gradually and the electrolytic rate will be also reduced according to the proportion until the control circuit is open at the end of electrolytic. This system enables to guarantee the high precision, sensitive valve and speed in the process of analysis. Additionally, some interference factors have to be introduced in the measurement, for instance, the moisture intruded from air make the electrolytic tank absorb moisture and occur blank current. However, the displayed number shown on screen is the real moisture content of sample since the blank current can be stored in this instrument.