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|Character:||High Precision||Display:||Color LCD Touch Screen|
|Instrument Feature:||Stable And Reliable||Titration Method:||Coulomb Analysis|
Karl Fischer Coulomb titration is the most reliable method to detect trace moisture for different substances, which was utilized successfully by TYHD-TMT2 trace moisture tester. What’s important, this instrument is able to work more reliably and conveniently by using the most advanced control circuit and 32 bit embedded microcontroller processor as the master control core and utilizing embedded mini operating system. Character with fast analyzing speed, simple operation, high precision and strong automatism, the trace moisture tester has been widely used in the industry of petroleum, chemical, power, railway, pesticide, medicine and environmental protection.
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.
Structure Characteristics :
Mainframe of instrument:
1. Color touch screen 2. Printer
3. Electrolytic electrode socket 4. Measuring electrode socket
5. Electrolytic tank socket 6.RS232 Interface 7. Power socket and integrated switch
Electrolytic tank schematic diagram:
(4)Sample cock (5)Measuring electrode (6)Electrolytic electrode
1)Reagent Adjustment Of And Blank Current Clearing；
2)Influence Of The Size Of Blank Current To Measuring Accuracy；
1.Electrode Open Circuit Measurement；
The following items should be checked if the status is open circuit when measuring the open circuit of electrode and alert to check measuring electrode and the CL value is displayed as 9999 ( the maximum value) at that time:
1) Whether there is a good contact between the measuring electrode plug and socket；
2)Whether the measuring electrode lead is disconnected.
2.Electrolytic electrode open circuit；
If the status of measuring interface was shown as excess water and alert that it is balancing automatically, the screen doesn’t count and DJ value is 0.00, it is necessary to check the following conditions
1) Whether the electrolytic electrode plug contact with socket good or not；
2) Whether the electrolytic lead in cathode chamber is open circuit.
3.Electrode Short Circuit Measurement；
In case short circuit is happened, the status is shown as short circuit and alert to check the measurement electrode, and CL is displayed as 0 at that time, it is necessary to inspect the following situations:
1)Whether there is short circuit happened in measuring plug or socket；
2) Whether the two metal balls at the ends of measuring electrode contact with each other；
3)Whether there is leakage of measuring electrode or it still can not arrive to the terminal point although the titration is beyond half hour. (It is necessary to change measuring electrode as it is not a problem of electrolytic solution).
There is type test report for it, test items as following:
Type Test Items
|1. appearance and structure 2.function 3. electrical device performance 4.low temperature performance 5.high temperature performance 6.alternating temperature humidity7.vibrationendurance 8.incline drop test 9. electrical device life 10. static electricity and elecro-discharge immunity test 11.radio frequency electromagnetic field radiated immunity test 12.surge impact immunity test 13. power frequency magnetic field immunity test. 14. Adjacent interference test 15.short-circuit withstand impact test 16. fire hazard test 17. power consumption test 18. protection grade test 19. gripping strength test of grip structure.|
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