Production of imported metal sheathed glass high-efficiency atomizer (WNA-1 series Huayang 2610 type)

Metal covered glass high-efficiency atomizerIntroduction

The metal sheathed glass high-efficiency atomizer is a WNA-X series Wu's metal sheathed glass high-efficiency atomizer invented by Professor Wu Tingzhao, an expert in China's atomic absorption analysis industry. It has become a necessary key component for all domestic atomic absorption manufacturers and can be matched with all imported atomic absorption, saving a lot of foreign exchange for the country and enterprises. The invention, production, and use of metal sheathed glass high-efficiency atomizers have greatly improved the sensitivity, detection limit, and stability of atomic absorption spectrophotometers, reaching the highest level of flame atomic absorption spectrometry. There are three models available:

WNA-1 ordinary metal sheathed glass high-efficiency atomizer

WNA-2 type continuous adjustable metal sleeve glass high-efficiency atomizer with a lifting capacity of 1-10mL

WNA-3 type hydrofluoric acid resistant metal sheathed glass high-efficiency atomizer

　　Metal covered glass high-efficiency atomizerExcellent features:

1. Combining the high performance of glass atomizers with the robustness of metal atomizers.

2. Use a specially designed flow restriction tube to prevent blockage.

3. The sensitivity has reached the highest level of flame atomic absorption spectrometry.

4. Acid resistant (except hydrofluoric acid), WNA-3 type is also resistant to hydrofluoric acid.

5. User free tuning, excellent performance remains unchanged for a long time.

6. We can provide matching services for all domestic and foreign manufacturers.

　　Metal covered glass high-efficiency atomizerStructural features:

The tested solution is sucked into the inner tube of the coaxial glass atomizer, and compressed air is connected to the outer tube. The nozzle is covered with a removable impact ball cap (not interchangeable between different atomizers). The glass atomizer is fixed in a stainless steel protective sleeve, and its shape corresponds to the different atomizer seats of each type of host. The inner tube is plugged into a specially designed polyethylene flow restriction tube (resistant to organic solvents), or plugged into a stainless steel tube - silicone tube - polyethylene flow restriction tube (not easy to fall off, but silicone tube is not resistant to organic solvents).

Installation and adjustment of metal sleeve glass high-efficiency atomizer:

1. If the inner diameter of the atomizer seat can pass through the atomizer with the impact ball cap, it is not necessary to take off the end of the fog chamber and directly insert it into the atomizer that has been adjusted to the status of * spray.

2. If the atomizer seat cannot pass through the atomizer with the impact ball cap, take down the end of the fog chamber, insert the atomizer with the impact ball cap removed into the atomizer seat and fix it, put on the impact ball cap, adjust it to the * spray state as follows, then reinstall the end of the fog chamber to the fog chamber and fasten it.

3. * Adjustment of spray state: suck and spray water (the lifting amount should be more than 4ml/min), push the impact ball cap against the nozzle and rotate it back and forth, and observe the state of the sprayed air flow with fog *The status is:

1) Spray forward, symmetrical on all sides, with a large angle;

2) Spread out in a flat plane, symmetrical on all sides, and after adjustment, the connecting rod of the impact ball cap should be within a downward ± 45 degree angle.

　　Metal covered glass high-efficiency atomizerWorking parameter description:

1. At a compressed air pressure of 0.2Mpa, use an air flow meter calibrated at room temperature and pressure to measure a flow rate of 10-11 l/min (measured from the outlet at room temperature and pressure). If the air flow meter is connected in series before the atomizer intake pipe for measurement, the reading will drop to around 5.5 l/min. The host manufacturers are all connected in this way, and this reading cannot be used for chemical calculation (similarly, acetylene flow rate cannot be used for chemical calculation). If the manufacturer or user changes the standard working pressure of the atomizer to 0.2 MPa, the analytical performance may be altered. No need to use auxiliary gas, the same atomizer can also use laughing gas, providing safe usage methods and automatic air/laughing gas switching valves, customized 5cm burner.

2. Sample solution lifting amount: Based on the maximum absorbance of copper measured, it is about 4-6 ml/min. This lifting amount is also applicable to other elements that require low-temperature atomization. For elements that require high-temperature atomization (such as calcium), the lifting amount should be reduced. Otherwise, too much aerosol will enter the flame and cause the flame temperature to decrease, resulting in a decrease in atomization efficiency, that is, a decrease in measurement sensitivity. At the same time, interference from other elements will increase. If the concentration of the measured element is not particularly low and may not be measured under * conditions, the flow restriction tube may not be replaced.

If the WNA-2 atomizer is used, the lifting amount can be continuously adjusted, and the lifting amount of all measurable elements can be found. That is, using a standard solution with a higher concentration (absorbance around 0.3A), the lifting amount can be continuously increased or decreased, and the lifting amount with the highest absorbance (maximum not exceeding 6ml/min) can be selected, which is much more convenient than replacing the inlet pipe of the WNA-1 type.

Acetylene flow rate: Use a standard solution with an absorbance of around 0.3A, continuously change the acetylene flow rate, and choose the flow rate with the highest absorption. Note that the flame itself has a large absorption, especially for short wavelength measurements. At this time, two different concentrations of standard solutions can be measured successively, and the absorbance can be subtracted (deducting the flame absorption) to select the condition with the largest difference.

　　Metal covered glass high-efficiency atomizerFault handling and maintenance:

1. Restricted flow tube blockage: usually blocked at the inlet, can be removed with fingers, or blown in reverse with compressed air or injected with water in reverse with a syringe.

2. When the sample solution is almost completely inhaled, a series of bubbles form inside the tube, and the resistance is high, which can stop the inhalation. Use your fingers to move the liquid tube to suck away the bubbles, which can be normal, or you can use a syringe to suck away the bubbles.

3. Inner tube blockage of atomizer: It is often blocked near the nozzle. Remove the impact ball cap and use compressed air or a syringe to inject water in reverse to flush out the blockage. Never use a metal wire to poke it, otherwise it will damage the atomizer.

4. Blockage of nozzle airflow channel: Remove the impact ball cap and rinse with reverse airflow or water, or use a syringe to inject water for rinsing.

5. If the inner tube or airflow channel of the nozzle is blocked by organic matter, accumulated dust, or dried salts: the impact ball cap can be removed and the nozzle can be inserted into a sulfuric acid potassium dichromate solution heated to smoke for a few seconds. After cooling, rinse with water (note: do not allow the washing solution to enter the inside of the atomizer). If the air flow decreases after using for more than six months, it should also be treated accordingly.

After each use, spray with distilled water for 2-3 minutes (tap water should not be used to prevent the solution from drying up and clogging).

7. The studio temperature should not be lower than 10 degrees, otherwise the cooling effect of the nozzle can cause the solution to freeze and block the atomizer.

8. If the main engine has a channel for adding auxiliary fuel gas, the auxiliary fuel gas should be turned off, otherwise the fuel gas not involved in spray will reduce the sensitivity, and the excessive fuel gas flow will not only consume more fuel gas, but also cannot ignite the flame.

9. All atomizers cannot exchange impact ball caps, otherwise the sensitivity will be greatly reduced.