Metal sheathed glass high-efficiency atomizer (WNA-1 series Hanshi type)

Metal covered glass high-efficiency atomizerIntroduction
Metal sheathed glass high-efficiency atomizer isProfessor Wu Tingzhao, an expert in China's atomic absorption analysis industry, invented the WNA-X series with Chinese characteristicsWu's metal sleeve glass high-efficiency atomizer,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 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-1type 普通型Metal covered glass high-efficiency atomizer
WNA-2type lift1-10mLInternally continuous adjustableMetal covered glass high-efficiency atomizer
WNA-3type Hydrofluoric acid resistant typeMetal covered glass high-efficiency atomizer

Metal covered glass high-efficiency atomizer Excellent features:

1Combining the high performance of glass atomizers with the robustness of metal atomizers.
2Using a specially designed restricted flow liquid tube,Not easily clogged.
3The sensitivity has reached the highest level of flame atomic absorption spectrometry.
4Acid resistant（Excluding hydrofluoric acid），WNA-3The type is also resistant to hydrofluoric acid.
5User free adjustment,Excellent performance * unchanged.
6Can be matched with all domestic and foreign manufacturers.

Metal covered glass high-efficiency atomizer structural characteristics:

Inhale the measured solution through the inner tube of the coaxial glass atomizer,The outer tube is connected to compressed air, and the nozzle is fitted with a removable impact ball cap（Different atomizers are not interchangeable）The glass atomizer is fixed inside a stainless steel protective sleeve,Its appearance is compatible with different atomizer bases of various types of hosts,Insert a specially designed polyethylene limited flow liquid pipe (resistant to organic solvents) into the inner pipe, or insert a stainless steel pipe—silicone tube—Polyethylene flow restriction liquid pipe (not easy to fall off, but silicone tubing is not resistant to organic solvents).

Metal covered glass high-efficiency atomizer Installation and adjustment:

1The inner diameter of the atomizer seat can pass through the atomizer that has been fitted with an impact ball cap,The end of the fog chamber can be directly inserted into the atomizer that has been set to * spray status without taking off the end of the fog chamber.
2If the atomizer seat cannot pass through the atomizer that is already fitted with an impact ball cap,Remove the fog chamber end,Insert the atomizer with the removed impact ball cap into the atomizer holder and secure it,Put on the impact ball cap,Press the following method to adjust to the * spray state,Reinstall the fog chamber end onto the fog chamber and tighten it.
3* Adjustment of spray state:Spray water（The increase should be greater than4ml/min）,Push the impact ball cap against the nozzle and rotate it back and forth,Simultaneously observe the state of the sprayed misty airflow.*The status is:

1）Spray forward,Symmetrical on all sides,The angle is relatively large;

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

Metal covered glass high-efficiency atomizer Description of working parameters:

1Under the pressure of compressed air0.2MpaNext, measure the flow rate using an air flow meter calibrated at room temperature and pressure10-11 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 decrease to5.5 l/minabout. This is how host manufacturers connect,This reading cannot be used for chemical calculations (similarly, acetylene flow rate cannot be used for chemical calculations). The manufacturer or user changes the standard working pressure of the atomizer0.2MPaThe analysis performance has changed. No need to use auxiliary gas,The same atomizer can also use nitrous oxide, providing safe usage and air conditioning/Laughing gas automatic switching valve, customized5cmBurner.
2Sample solution lifting amount: based on the maximum absorbance of copper measured,approximately4-6 ml/minThis increase also applies to other elements that require low-temperature atomization. For elements that require high-temperature atomization (such as calcium), the increase should be reduced, otherwise too much aerosol will enter the flame and cause the flame temperature to decrease,Causing a decrease in atomization efficiency,The sensitivity of the measurement decreases,At the same time, there is increased interference from other elements,If the concentration of the tested element is not particularly low,Not all measurements may be conducted under * conditions, so the flow restriction tube does not need to be replaced.
If usingWNA-2Type atomizer,Continuously adjustable lifting amount,Measurable elements can all be found * increase amount,Use a standard solution with a higher concentration (absorbance at)0.3ALeft and right), continuously increase or decrease the lifting amount, and choose the lifting amount with the highest absorbance (the highest absorbance should not exceed)6ml/min）Far more thanWNA-1Easy to replace the inlet pipe.
Acetylene flow rate: measured by absorbance0.3ALeft and right standard solutions,Continuously change the acetylene flow rate and choose the flow rate with the highest absorption. Note that the rich flame itself also has a large absorption, especially for short wavelength measurements. At this time, two different concentrations of standard solution can be measured successively,Subtraction of absorbance（Deducting flame absorption）Choose conditions with significant differences.

Metal covered glass high-efficiency atomizer Fault handling and maintenance:

1Restricted 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.
2When the sample solution is almost completely inhaled, a series of bubbles form inside the tube. If the resistance is high, the inhalation can be stopped. Use your fingers to move the liquid inlet tube to remove the bubbles, which can be normal. Alternatively, you can use a syringe to remove the bubbles.
3Inner tube blockage of atomizer: 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 poke with metal wireOtherwise, it will damage the atomizer.

4Blockage of nozzle airflow channel: The impact ball cap can be removed and rinsed with reverse airflow or water, or a syringe can be used to inject water for rinsing.
5The 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 to insert the nozzle into sulfuric acid heated to smoke—In potassium dichromate solution, rinse with water after cooling for a few seconds (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.
6After each use, use distilled water to suck and spray2-3Minutes, (Do not use tap water to prevent the solution from drying up and clogging).
7The temperature in the studio must not be lower than10Otherwise, the cooling effect of the nozzle can cause the solution to freeze and block the atomizer.
8If 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 excessive fuel gas flow will not only consume more fuel gas, but also cannot ignite the flame.
9All atomizers cannot exchange impact ball caps, otherwise the sensitivity will be greatly reduced.

Beijing Hanshi Instrument Co., Ltd

(Beijing Hanshi Production Institute)

Xuanzhuanghu, Lisui Town, Shunyi District, Beijing

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：www.hshth。。 ｃｏｍ