What are the debugging steps of the automatic trace moisture analyzer?

1. Precautions for debugging Karl Fischer reagent (electric power method):

Normally, the color of the pour when the reagent is unsealed is dark brown. If the color of the poured reagent is light yellow, the reagent is judged to be invalid.

Reagents should be sealed and protected from light when stored. The temperature should not exceed 30°C.

Debugging steps: 1: Take about 60 microliters of purified water with a microliter sampler.

2: Pause for 1-2 seconds per injection of 4 μl of purified water and wait for the chemical reaction of the reagent with the water.

3: When the reagent turns dark red, inject 2 microliters of water per injection and pause for about 3 seconds.

4: If the reagent turns pale yellow and shows excessive iodine, use a microliter sampler. Inject about microliters of purified water. When the normal count of the instrument reaches the end point.

Debugging the reagent in the electrolytic electrode:

If the reagent in the electrolytic electrode is still dark brown, it will cause the instrument to jump back and forth between water and iodine. This is normal. Just pour some purified water and adjust it to a light yellow color.

1: Take 2 μl of purified water, remove the drying tube above the electrolytic electrode, and inject the purified water into the reagent inside the electrolytic electrode.

2: Turn off the power and gently shake the cell.

3: If the reagent turns burgundy, inject 1 μl of purified water and shake the bottle. Until the reagent in the electrolytic electrode turns pale yellow, the instrument technology can reach the end.

Precautions: 1: If water is injected directly into the reagent without an interval when debugging the reagent, it will cause the reagent to change color rapidly, and the count will not stop. (The electrolytic electrode and the reagent in the large tank bottle turn pale yellow together).

2: Reagents that change color rapidly will cause the instrument to leak and fail to reach equilibrium. In the worst case, the electrolytic electrode is burned.

3: Pour the dark brown reagent into the electrolytic electrode, shake it gently, if the reagent turns light yellow, it proves that there is water in the electrolytic electrode, and it is not dried. Or the debugging reagent is injected too quickly and too much.

A trace moisture analyzer is an instrument that specializes in the detection of liquids, solids, and other trace amounts of water. Then we often encounter some problems in the process of using the trace moisture analyzer to work, if we do not understand these problems, it will cause us trouble, so it is very necessary to understand some common problems that will occur in the process of use, and can better complete the detection task.

Frequently Asked Questions about Trace Moisture Analyzer:

1. The color of the anode electrolyte does not show normal color, but is between dark yellow and brown. The reason for this phenomenon is that the electrolyte of the trace moisture analyzer is too dark, which is the ability of the electrode to influence the electrolyte is reduced. So how to solve these problems, you can use a paper towel to clean the stolen goods on the surface of the electrode, check whether the measuring electrode can be connected normally, it may be that the electrode is faulty.

2. Pre-titration of fresh anode electrolyte with high drift. It can be caused by the presence of some residual water in the titration. The silica gel and molecular sieve in the dryer can be replaced, and each electrode interface and plug of the titration table can be checked to see if they are tight, and some silicone grease can be added to some loose interfaces.

3. What is the reason why the finch deviation is too high in standby? It may be that the moisture in the anode pool penetrates into the anode pool, so the solution to this problem is also very common, you can directly replace the electrolyte in the anode pool, add a small amount of one-component capacity Carfischer reagent to the cathode electrolytic cell for drying, and keep the liquid level of the anode solution higher than the page height in the cathode pool.

4. The drift value of the sample is very high after titration. There is some reaction between the sample being tested and the anode electrode solution, resulting in water. There are three solutions to this situation, the first is to replace the anode electrode solution with another type of anode solution or to change to another sample pretreatment method, and the second is to cause a side reaction between some volatiles in the sample and the Karl Fischer reagent.

The third is to change the method of early processing of sample pre-wisdom and Zen.

5. If the titration is too long, the titration will not be suspended. It may be that the control parameters are not selected properly. You can use the relative drift termination as the ending parameter to increase the relative drift termination value. Another possibility is that the conductivity of the anode electrode fluid is too low, and the anode electrode fluid can be replaced directly.

The above 5 situations are some problems that will be encountered in the use of trace moisture analyzer, and the user must understand these situations, so when encountering these problems, they can quickly solve the problem, ensure the normal operation of the experiment, and also provide a guarantee for the accuracy of the final results.

Trace moisture analyzer.

Trace moisture analyzer use:The trace moisture analyzer is mainly used for moisture detection in some industries such as liquid, medicine, melting, coatings, inks, etc.?

Notes on the selection of trace moisture analyzers:Trace moisture analyzers are divided into different categories, different types and different uses, especially the moisture range and sample status of the test sample, etc.;

Trace moisture analyzer use:It is better to know some chemical knowledge among the users, the platform should be stable, and the temperature and humidity should also be noted;

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Pay attention to detail one: consider the popularity of the manufacturer.

** and quality is proportional to the relationship, during the daily purchase of trace moisture analyzer, can not just focus on a single product, at this time it is inevitable to ignore the quality, affecting the subsequent use. In the face of this series of problems, in order to ensure that the use of the effect of the fire to get a safe upgrade, it is still very necessary to consider the popularity of the manufacturer, choose a big brand to buy, although it is a little expensive, but the quality is guaranteed, so that consumers can use more at ease.

Attention to detail two: after-sales service***.

In the selection process of trace moisture analyzer, after-sales is still a very important part. In the selection stage, it is necessary to choose and face it in combination with the specific situation, which is to ensure that the treatment of a link in each hole section is more reflective, which facilitates the next operation and makes the after-sales service itself not worry too much. Considering these effective applications will make the selection of details more in place, and the quality of use will be more in line with the user's needs.

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SC-200B automatic trace moisture analyzer is designed and produced using the "Karl-Fischer Coulometric principle", which has the advantages of high measurement accuracy, good repeatability and low testing cost, and is widely used in petroleum, chemical, pharmaceutical, electric power, scientific research and education departments to accurately measure trace moisture in various liquids, solids and gases.

1. During the use of the instrument, the stirring key must be kept open, and if it is closed, the electrolyte can be forced to periodine. When iodine is perused, a small amount of distilled water can be injected into a microsampler and adjusted to the equilibrium point before the sample is measured.

2. The reagent must fully reach the equilibrium point before the sample can be measured.

3. Avoid using the same injector for multiple samples, which will affect the measurement error.

4. Do not pull out the push-pull rod of the microsampler, if it is pulled out, the injector will be damaged and can no longer be used.

7. Precautions when using reagents.

1.The newly replaced reagent is dark brown and appears to be periodine when it enters the sample measurement. At this time, it is not possible to measure, and an appropriate amount of pure water needs to be added to adjust the reagent equilibrium point.

You can first use a 50 microliter injector to draw 5 microliters of pure water and inject it, repeat it several times, and when the color of the reagent becomes significantly lighter, pay attention to controlling the injection volume until it enters the overwater state.

2.In order to make the measurement results more realistic and valid, we recommend that the new reagent is just in the aqueous state, and then inject 5 microliters of pure water, and the instrument can be calibrated and the sample can be measured after the instrument has found the equilibrium point.

3.The interval between the use of the instrument is long, and the next time you use it, you can gently shake the electrolytic cell bottle a few more times to make the reagent absorb the water on the bottle wall faster, and the instrument will enter the equilibrium point faster.

4.During the normal assay, every 100 ml of reagent can react with no less than g of water. If the assay time is too long, the sensitivity of the reagent decreases, and the reagent should be replaced with a new one.

5.If a large number of bubbles are released during the electrolysis process or the reagent is contaminated into a light reddish-brown color, the blank current will increase, the reproducibility of the assay will be reduced, and the time to reach the end point will be longer, in this case, the reagent should be replaced immediately.

6.Be careful not to inhale or touch the reagent with your hands. If in contact with **, rinse with water in time.

7.Reagents are corrosive, so please keep them safe.

Principle of Trace Moisture Analyzer:

The reagent solution is a mixture of dominant iodine and pyridine and methanol filled with sulfur dioxide. The principle of the reaction between Karl-Fischer reagent and water is that when water is present, iodine is reduced by sulfur dioxide, and in the presence of pyridine and methanol, pyridine hydroiodate and pyridine methyl sulfate are generated.

The reaction formula is: H20+I2+SO2+3C5H5N 2C5H5N·Hi+C5H5N·SO3 ......1)

c5h5n·so3+ch3oh → c5h5n·hso4ch3 ……2)

During electrolysis, the electrode reacts as follows:

Anode: 2i- -2e i2 ......3)

Cathode: 2h+ +2e h2 ......4)

The iodine produced by the anode reacts with water to form hydroiodic acid until all the water is reactive, and the end point of the reaction is indicated by a detection unit composed of a pair of platinum electrodes. According to Faraday's law of electrolysis, the number of molecules of iodine participating in the reaction is equal to the number of molecules of water, which is directly proportional to the amount of charge. The equation between the amount of water and the amount of charge is established as follows:

w=q/ ……5）

Where: w -- the moisture content in the sample Unit: micrograms.

q -- Electrolytic quantity unit: millicoulombs.

The working principle of the trace moisture analyzer is actually different from the principle of other instruments, after all, the substances detected are different, the application fields are different, and its functional structure may be different, so when we choose products, we should also choose a more ideal instrument according to the current situation, so what is its principle? Let's find out.

Everyone knows that the principle of the trace moisture analyzer is to use the Karl Fischer Coulomb titration method to detect, the application of microcomputer automatic control technology, the use of large screen LCD screen, full Chinese menu prompt operation, rich calculation, printing experimental results function, is the oil and power industry and scientific research institutions to test the ideal instrument for moisture content.

Karl Fischer titration method is a method of measuring the moisture of a sample with methanol as the medium and Karl Fischer as the titration solution. This method is simple to operate and highly accurate, and is widely used in petroleum, dyes, grain and other fields. It is especially suitable for samples that are easily destroyed when exposed to heat, and can be used to measure not only free water, but also bound water, and is often used as a standard analysis method for moisture, especially trace moisture.

However, it is not suitable for samples containing strong reducing substances such as VC.

When the concentration is above, the reverse reaction can occur. If we allow the reaction to proceed in a positive direction, an appropriate alkaline substance needs to be added to neutralize the acid formed during the reaction. It has been experimentally proven that the addition of pyridine to the system allows the reaction to proceed to the right.

Experiments have proved that pyridine is a more suitable reagent, and pyridine can also combine with iodine and sulfur dioxide to reduce the vapor pressure of the two.