The main classification of nitrogen blow dryers, what is the working principle of dry nitrogen blow

1. According to the structure of the heating tank of the instrument, it is divided into: square and circumferential nitrogen blowing instrument.

2. According to the heating mode of the instrument, it is divided into: metal dry bath type and water bath type nitrogen blowing.

Nitrogen purge main features:

1.The heater allows the sample to be heated quickly and efficiently to evaporation temperature, while the gas is blown from the gas chamber to the surface of the solution through the gas needle, promoting the rapid flow of the solution.

Evaporation and sample concentration.

2.Each purge needle of the nitrogen purge can be controlled independently, so it can be purged separately without wasting gas.

3.The entire working system consists of an adjustable gas chamber and a heater.

4.The position of the needle in the air cavity can be changed to suit different tubes. The standard needle length is 150mm

5.The height of the air chamber can be adjusted according to the height of the solvent level, and the entire system can be placed in a fume hood when concentrating toxic solvents.

6.The nitrogen purge has automatic fault detection and alarm functions.

7.It is equipped with an air cavity and a special adjustable bracket as standard.

8.Built-in over-temperature protection device.

9.Real-time temperature display, decreasing time display.

1.According to the structure of the heating tank of the instrument, it is divided into: square and circumferential nitrogen blowing instrument.

2.According to the heating mode of the instrument, it is divided into: metal dry bath type and water bath nitrogen blowing instrument.

3.Among them, the metal dry bath heating carrier is divided into aluminum block hole dry bath, aluminum bead bath, and fine yellow sand bath, which is the highest grade in aluminum bead bath.

First of all, you need to determine what kind of sample you are doing, the requirements of sample concentration, the general nitrogen blowing instrument is roughly divided into dry nitrogen blowing instrument and water bath nitrogen blowing instrument, both of which can achieve the main role, its working principle is to blow nitrogen into the heated sample test tube, so that the solvent in the sample can be quickly evaporated and separated, because nitrogen will not react with the sample when it is matched aside, so as to achieve the purpose of anaerobic concentration of the sample and keep the sample more pure.

So what is the difference between a dry nitrogen blowing instrument and a water bath nitrogen blowing instrument?

The dry nitrogen blowing instrument is generally a heat conduction of aluminum blocks or sand conductivity, and the general temperature can reach more than 100 degrees Celsius, that is, the heating temperature can be very high, and there will be no water vapor to interfere with the sample at high temperatures, but it also has a disadvantage that their heating uniformity is not very good.

The water bath nitrogen blowing instrument relies on the water medium to conduct heat, so its temperature can only reach 100 degrees Celsius, if you heat to 100 degrees Celsius, there will be water vapor, which may interfere with the sample in a closed environment, but its advantage is that the heating uniformity will be very good, and the water bath type is generally used in the past.

Therefore, when the customer chooses, the main consideration is the characteristics of the concentrated sample, what temperature needs to be carried out, the dry temperature is high, convenient, no need to add water, the water bath is heated more evenly, and the water needs to be changed regularly.

The heating characteristics of the dry nitrogen blowing instrument NAI-DCY-12G are as follows:

1.The heater rapidly heats the sample to evaporation temperature, while the gas is blown to the surface of the solution through the gas needle, which promotes rapid evaporation and concentration of the solution.

2.The position of the needle in the air cavity can be changed to suit different tubes.

3.The height of the air chamber can be adjusted, and the standard air needle length is 150mm.

4.There are 12 airway control switches, so no gas is wasted.

5.When concentrating toxic solvents, the entire system can be placed in a fume hood.

6.Built-in over-temperature protection device, automatic fault detection and alarm function.

The display screen, temperature synchronization display, time decreasing display, simple and convenient operation.

8.It is equipped with an air cavity and a special adjustable bracket as standard.

Comparison of burial according to the heating method of Naai's dry nitrogen blowing instrument NAI-DCY-12G and water bath nitrogen blowing instrument:

Water bath heating is usually to place the test tube that needs to be heated in a beaker containing water, the heat source heats the water, and the water then transfers the heat to the test tube, which can be regarded as an indirect heating process, which is different from the dry direct contact heat source heating; In addition, because a thermometer can be inserted into the water of the beaker during the water bath heating process, the water temperature can be observed in real time and the temperature of the water can be well controlled, and it is difficult to realize the real-time control of the temperature by the dry heating method.

During the heating process of the water bath, the test tube is immersed in the beaker water, and all parts are heated evenly; In the dry heating method, the bottom of the test tube is usually heated more than the middle and upper part.

The heating of the water bath is slow and the cooling is slow, and the heating temperature does not exceed 100, which is a "mild" heating method; The heating temperature can be as high as about 180, which can be regarded as a kind of "rapid fire" heating, and the two heating methods are suitable for different substance samples.

Some organic substances should not come into contact with open flames, so the heating process must be done by bathing with water; However, some organometallic reagents are not easy to contact with water, so they cannot be heated in a water bath (because water bath heating will produce a large amount of water vapor).

Usually according to the requirements of the experiment, dry and water baths are used in different experiments, and their effects are the same! Don't know if my answer will help you!

How it works.

The working principle of the nitrogen blowing instrument is to blow nitrogen into the surface of the heated sample, so that the solvent in the sample can be quickly evaporated and separated, so as to achieve the purpose of anaerobic concentration of the sample and keep the sample more pure. A nitrogen blowing instrument is often used instead of a rotary evaporator commonly used in the past for concentration.

The control part, the heating part, the circular nitrogen blowing instrument is generally a circular water bath nitrogen blowing instrument, and the precautions for the use of the circular nitrogen blowing instrument of qimo are as follows:

1. Under the same environmental conditions, the dryness and wetness of the heating medium, the degree of pollution in the fume hood and the purity of the purge gas all affect the evaporation and concentration effect.

2. In order to prevent cross-contamination, the air needle tube should be cleaned in time after each use. (mainly the lower water bath).

The voltage used by the hole round nitrogen blowing instrument is 220V, and the power supply must be grounded. Be careful not to get water inside the case.

4. If the water bath heating method is used, water with a volume of more than 2 3 should be added to the sink, and dry boiling is strictly prohibited.

5. When the nitrogen gas is introduced, the valve should be opened slowly to prevent the sample from splashing, causing loss and pollution.

6. Use the flowmeter, before opening the valve, adjust the flowmeter to the minimum, open the valve, and then open it slowly.

7. The maximum fluid pressure of the flowmeter is.

8. After the instrument is installed, the safety fixing screws shall not be removed under any circumstances.

9. The circular nitrogen blowing instrument is a mechatronics precision equipment, and under any circumstances, the circular nitrogen blowing instrument cannot be disassembled without permission.

10. When adjusting the temperature, please do not press and hold the temperature control button, otherwise the temperature control will be messed up.

There are two common types of dry nitrogen blowing instrument and water bath nitrogen blowing instrument, and the difference between them is reflected in the difference in heating module, temperature range, application range, etc.

1) Heating module.

The dry nitrogen blowing instrument is heated with a metal module, generally an aluminum module.

The water bath nitrogen blowing instrument is heated in a water bath.

2) Heating temperature range.

Dry nitrogen blowers are heated at temperatures ranging from room temperature to 150 degrees.

The heating temperature of the water bath nitrogen blowing instrument ranges from room temperature to 100 degrees.

3) Scope of application.

For a very small number of samples that are afraid of water, a water bath nitrogen blowing instrument cannot be used, and only a dry heat type can be used.

4) Heating characteristics.

The water bath heating method is gentler and more uniform than the dry heat method.

5) Sample cooling.

When a particular sample cannot be heated, but needs to be cooled, a water bath can be used as an ice bath.

(1) Do not use a nitrogen blowing instrument for substances with a ignition point of less than 100.

2) Hands and eyes should be protected when using a nitrogen blowing instrument.

3) The nitrogen blowing instrument should be used in a fume hood to ensure good ventilation.

4) Do not move the nitrogen blowing instrument when heating to prevent burns.

5) Use a three-wire grounded power supply.

6) Do not open the water bath shell with electricity to prevent electric shock.

7) The maintenance of the nitrogen blowing instrument should be carried out by professionals, and improper replacement of components may cause damage to the nitrogen blowing instrument or potential safety hazards.

8) Do not use nitrogen blowing instrument for highly flammable substances such as petroleum ether.

9) Do not use acidic or alkaline substances, otherwise the nitrogen blowing instrument will be damaged.

Precautions for the use of nitrogen blow-dryer: 1. Do not use the nitrogen blow-dryer for substances with a ignition point lower than 100. 2) Hands and eyes should be protected when using a nitrogen blowing instrument.

3) The nitrogen blowing instrument should be used in a fume hood to ensure good ventilation. 4) Do not move the nitrogen blowing instrument when heating to prevent burns. 5) Use a three-wire grounded power supply.

6) Do not open the water bath shell with electricity to prevent electric shock. 7. The maintenance of the nitrogen blowing instrument should be carried out directly by professionals or by the manufacturer, and improper replacement of components may cause damage to the nitrogen blowing instrument or potential safety hazards. 8) Do not use nitrogen blowing instrument for highly flammable substances such as petroleum ether.

9) Do not use acidic or alkaline substances, otherwise the nitrogen blowing instrument will be damaged.

Beijing Million Electronic Technology Center is a large-scale instrument manufacturer and seller, the business areas mainly include: gas detectors, metal detectors, environmental protection equipment, health care, laboratory instruments, chemical equipment, agricultural instruments, mechanical and electrical equipment, fire and security equipment, power communication equipment and other almost all industries. The company's JC508-MD200-2 nitrogen blowing instrument is mainly used in the concentration and preparation of large quantities of samples, such as drug screening, hormone analysis, liquid phase, gas phase and mass spectrometry sample preparation.

In the pharmaceutical, food safety, especially infant milk products, medical testing, pesticide residues, it provides a time-saving and efficient platform for the preparation and processing of samples in gas chromatography (GC), liquid chromatography (HPLC) and other analytical methods, and is the best supporting equipment for solid phase extraction technology.