Coulometric Titration Method Coulometric Karl Fischer Titrator
Coulometric Titration Method is for Precise Measurement.
The Coulometric Karl Fischer Titrator is mainly usd for measuring very low water content (less than 2%) in liquid and gaseous samples. It is used to accurately test trace water content in various liquid, solid and gases. And it is widely applied to petroleum, chemical engineering, pharmacy, electricity, scientific research, education department and so on.
| Display mode |
English color LCD display |
| Measurement range |
3 micrograms of water to 200 milligrams of water. Water content range: 1 ppm to 100% |
| Resolution |
0.01 micrograms of water |
| Electrolysis speed |
up to 2.4 mg water/min |
| Electrolytic current |
0 ~ 430 mA |
| Ambient temperature |
Recommended room temperature ~ 40 °C Ambient humidity: ≤ 85% |
| Power |
AC 220V ± 10%. |
1.Intelligent Determination
2. Easy Operation
3. Background Compensation
4. Rotating Speed Control
5. End Point Indication
6. Perfect Calculating Function
7. Automatic Date Data Storage
The measuring principle used in this instrument is the Karl-Fischer Coulomb method. The principle is based on the fact that when water is present, iodine is reduced by sulphur dioxide, and in the presence of pyridine and methanol, pyridine iodine and methyl pyridine thioate are formed. The reaction formula is:
I2+SO2+3C5H5N+H20→2C5H5N·HI+C5H5N·SO3 ......................(1)
C5H5N·SO3+CH3OH→C5H5N·HSO4CH3 ....................................(2)
During the electrolysis process, the electrode reaction is as follows:
Anode: 2I--2e→I2 .......................................................................(3)
Cathode: 2H++2e→H2↑.............................................................(4)
The reagent solution used is a mixture of predominant iodine and pyridine-doped pyridine, methanol, etc., and iodine is formed on the anode by electrolysis, and iodine is reacted with water to form hydroiodic acid until all the water has been reacted. The end of the reaction was detected with a platinum electrode.
According to Faraday's law, the formula for calculating the moisture content in the sample is obtained:
.....................................................................................................(5)
Where: W - moisture content in the sample, in micrograms
Q--Electrolysis power, unit: millicoulomb
Calculated by the instrument, the moisture content of the tested sample is directly displayed on the display. The instrument uses an electrolysis current automatic control system. The size of the electrolysis current can be determined according to the moisture content of the sample, up to 430 mA.
This instrument uses Karl Fischer (Coulomb method) reagent
Electrolysis Cell Structure and Assembly:
(1) Large pool bottle (anode chamber) (2) Measuring electrode (3) Drying tube (4) Electrolytic electrode (cathode chamber) (5) injection plug (6) magnetic stir bar (7) electrolytic cell sealing plug
Accessories:
| No. |
Name |
Quantity |
| 1 |
Main Unit |
1 Set |
| 2 |
Electrolytic cell |
1 PC |
| 3 |
Electrolytic electrode |
1 PC |
| 4 |
Measuring electrode |
1 PC |
| 5 |
Drying pipe |
1 PC |
| 6 |
Gasket |
10 PCS |
| 7 |
Vacuum grease |
1 Box |
| 8 |
Power wire |
1 PC |
| 9 |
Magnetic stirring rod |
1 PC |
| 10 |
0.5 Microliter sample injector |
1 PC |
| 11 |
50 Microliter sample injector |
1 PC |
| 12 |
100 Microliter sample injector |
1 PC |
| 13 |
1mL sample injector |
1 PC |
Our product packaging has been proven over the long term and we usually have plywood boxes or cartons with trays. We will arrange the appropriate packaging according to the weight and size of the goods. Of course, you can also choose the packaging form.
| Packaging |
The product will be packed in wooden case, and also can be packed by others ways as your request. |
| Both neutral and customized packing are available. |
| Shipping |
We can ship the goods to you by international express,such as DHL, UPS, TNT and so on. |
| And you can choose the appropriate way based on your timeline and budget. Besides, you can choose to use your own shipping agent. |
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