1. The light source hollow cathode lamp should be used within the range of maximum allowable operating current. Do not turn on the light when not in use, otherwise it will shorten the service life of the lamp; but the long-term unused element lamp will need to be ignited for 15~60 minutes at the rated working current every one or two months to avoid performance degradation.
The moving parts of the light source adjustment mechanism should be regularly lubricated to prevent corrosion or even stuck, so as to keep the movements flexible.
2. After each analysis operation of the atomization system, especially after analysis of excessively high concentration or strong acid samples, spray distilled water for several minutes immediately to prevent the atomization tube and the combustion head from being contaminated or rusted. After ignition, a full blue flame with a uniform band shape should be placed over the entire crevice of the burner. If there is a notch in the middle of the band flame, it is jagged, indicating dirt or dripping above the gap in the combustion head. At this time, it needs to be cleaned. The method of cleaning is to turn on the air, close the acetylene, and insert the filter paper into the combustion gap. Wipe test; if the effect is not good, remove the combustion head and brush it with a soft brush; if a bead has formed, use a fine metallographic sandpaper or a blade to gently scrape it to remove sediment. Care should be taken not to shave the gap.
Nebulizers are often cleaned to avoid partial blockage of the nebulizer capillary. If the blockage occurs, it will cause the solution to increase the amount of decrease, absorbance value decreases.
If the instrument is not in use temporarily, cover the burner slit with hard paper to avoid dust accumulation. Relevant moving parts of the atomization system should be lubricated regularly to ensure flexible lifting. The air compressor must always discharge water and put oil, and the water separator should be cleaned frequently.
3. Optical components outside the optical system are often kept clean and are usually cleaned at least once a year. If there is dust deposition on the optical element, wipe it off with a tissue; if the optical element is stained with oil or splashes when measuring the sample solution, use a solution that has been immersed in a mixture of ethanol and ether (1:1). Greased and dried the gauze to wipe, then distilled water to wash off the soap, and then use the ear ball to blow the water. During the cleaning process, disable the hand to wipe the metal hard object or touch the mirror. The color filter should always be dry.
4. Because the gas path is made of polyethylene plastic pipe, the gas path is prone to aging for a long time. Therefore, frequent leak detection of the gas is required. In particular, leakage of acetylene gas may cause accidents. It is forbidden to use copper, H62 copper and silver parts in acetylene gas pipelines, and to ban oil. When testing high concentration copper or silver solutions, they should be sprayed with deionized water. When the measurement of the instrument is completed, the acetylene cylinder output valve should be closed first, and then the flame on the burner should be extinguished and then the gas valve on the instrument should be closed. Finally, the air compressor should be turned off to ensure safety.
Valves are found in virtually every industrial process, including water and sewage processing, mining, power generation, processing of oil, gas and petroleum, food manufacturing, chemical and plastic manufacturing and many other fields.
People in developed nations use valves in their daily lives, including plumbing valves, such as taps for tap water, gas control valves on cookers, small valves fitted to washing machines and dishwashers, safety devices fitted to hot water systems, and poppet valves in car engines.
In nature there are valves, for example one-way valves in veins controlling the blood circulation, and heart valves controlling the flow of blood in the chambers of the heart and maintaining the correct pumping action.
Valves may be operated manually, either by a handle, lever, pedal or wheel. Valves may also be automatic, driven by changes in pressure, temperature, or flow. These changes may act upon a diaphragm or a piston which in turn activates the valve, examples of this type of valve found commonly are safety valves fitted to hot water systems or boilers.
More complex control systems using valves requiring automatic control based on an external input (i.e., regulating flow through a pipe to a changing set point) require an actuator. An actuator will stroke the valve depending on its input and set-up, allowing the valve to be positioned accurately, and allowing control over a variety of requirements.
Stop Valves, Ball Cock, Angle Valves, Gate Valves, Check Valves
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