Oxygen Nitrogen Analyzer
What is oxygen nitrogen analyzer?
Oxygen nitrogen analyzer adopts a high-performance electrochemical sensor, which is an intelligent industrial analyzer combined with new microcomputer technology. The instrument has the advantages of high sensitivity, good performance, wide measurement range and accurate and reliable analysis results.
Working principle of oxygen nitrogen analyzer
Oxygen nitrogen analyzer is used to determine the elemental content of oxygen and nitrogen in various steel, non-ferrous metals, rare piles of earth and various new inorganic materials by heating and burning the specimens in an inert atmosphere with a pyroelectric infrared detector IR and a thermal conductivity detector TCD, respectively.
The instrument is equipped with two separate infrared detection cells for high and low oxygen detection. Nitrogen is measured by a dual range thermal conductivity cell. The sample can be heated up to a high temperature of over 3000 degrees in the graphite crucible of the high-power pulse furnace, which uses circulating cooling water.
Oxygen determination
Infrared oxygen meters are used at production sites to determine oxygen content. The sample is dropped from the feeder into a spectrally pure graphite crucible, which melts the sample in the high temperature crucible. The oxygen in the sample reacts with the carbon on the surface of the hot crucible, producing carbon monoxide in the vast majority and carbon dioxide in very small amounts. The gas is fed into the catalyst furnace by a gas pump, and the CO is converted to CO2, and then the CO2 is detected by an infrared cell and converted to oxygen content by computer processing.
Nitrogen determination
Nitrogen is extracted in molecular form and is generally detected with a thermal conductivity cell.
Feature of oxygen nitrogen analyzer
a. Temperature-controlled pulse heating furnace.
b. Imported electrochemical sensor with long life, high precision and fast response time, not subject to interference from other gas components.
c. Automatic temperature compensation function can eliminate the influence of ambient temperature on test results.
d. Timing automatic data storage function.
e. Alarm point can be set arbitrarily in the full range. Pulse heating up to 3000 ℃ or more high temperature, suitable for metal and ceramic sample analysis.
f. The plug-in upper electrode can be easily replaced. AC/DC power supply. The built-in lithium-ion battery can work continuously for about 15 hours on a full charge, and the battery voltage will automatically alarm when low.
g. The analysis of granular and chip samples does not require tin foil wrapping.
h. A variety of analysis modes are available for the determination of total oxygen and total nitrogen in the sample, as well as the fractional oxygen of various oxides and fractional nitrogen of various nitrides.
i. This equipment can be used for trace oxygen detection in reducing gases such as high-purity hydrogen.
j. Optional built-in pump and external filter can be added.
Composition of oxygen and nitrogen analyzer
A. Structure of the whole machine
The whole machine adopts a modular integration design, four independent modules of pulse electrode furnace, gas circuit system, circuit system and detection system are integrated into one floor-mounted mainframe with a simple and generous appearance. It has automatic zero adjustment and high and low range automatic switching functions. It adopts a general-purpose 64-bit computer to realize the control of the whole machine, 32-bit embedded ARM microcomputer control and a 24-bit high-precision data acquisition system in the main machine to achieve the requirement of high control precision and speed.
B. Electrode furnace system
The pulse electrode furnace heats up at high temperature and adopts programmed power control, which can provide a variety of programmed heating methods such as constant power heating, ramp heating and segmental heating, thus improving the analysis accuracy and suitable for rapid analysis of low melting point materials such as aluminum alloys to high melting point materials such as tungsten alloys.
The electrode can be used in a variety of crucible types, including set crucibles and high-temperature crucibles according to the release of different samples, which is effectively reduced the user’s cost of use.
The electrode is cooled by a single-cycle independent cooling system, which can be directly connected to circulating water or an external water-cooling device, featuring a good cooling effect and high reliability.
C. Gas circuit system
The whole machine adopts the integrated floor design, the space is open, and the air circuit system connection route is effectively streamlined, so the whole machine air circuit system is more concise and reliable.
The gas circuit components include a solenoid valve, cylinder, gas circuit tube and gas circuit connector (the life of a solenoid valve can reach more than one million times). The special three-axis guiding cylinder can ensure the smooth lifting and lower of the electrode, ensure good contact between the graphite crucible and the upper electrode, and at the same time ensure the uniform force of the graphite crucible, which is conducive to long time high-temperature heating.
The automatic furnace head with air curtain protection and automatic air purging mechanism effectively guarantees the accuracy of oxygen analysis. The furnace head is a split structure. The upper and lower electrodes are easy to disassemble and replace. The lower electrode is made of high-temperature alloy material, which has a long service life and low cost of use, avoiding the trouble of replacing the electrode with a professional technician when the whole furnace head is used.
Contaminants are discharged from the top of the furnace and do not enter the system, which is easy to operate and does not require high-sealing on the system.
The sample feeding device is simple and can be fed automatically, which is convenient for maintenance and cleaning in case of abnormal failure.
The electronic micro flow sensor is used for high precision flow control, which minimizes the impact of airflow changes on the analysis.
D. Circuit system
Circuit systems using large-scale integrated circuits, and power supply are used solid-state power supply modules, as well as power supply modules with short-circuit protection, current shock resistance, strong anti-interference ability, dustproof, simple and reliable.
E. Detection system
a. Analytical methods
The infrared absorption method is used for oxygen measurement, while the thermal conductivity method is used for nitrogen measurement.
b. Infrared detector
The use of an integrated solid-state infrared sensor to determine oxygen has a variety of ranges of infrared detection cell optional. The infrared light source uses a high-efficiency, long-life precious metal micro infrared luminous body and gold-plated metal reflector. The modulation system uses a high-precision stepper motor controlled by a single-chip computer to ensure the long-term stability of the modulation frequency. Combined with the international advanced level of narrow band filter and high-precision A/D sampling card, the machine has a very high detection sensitivity to effectively detect the ppm level of oxygen content. The instrument also uses an advanced temperature-compensated semiconductor detector to reduce the instrument by external influences, stabilizing the baseline signal.
c. Thermal conductivity detector
The use of a high-sensitivity thermal conductivity cell with a continuously adjustable current ensures excellent sensitivity and linearity at all stages of the range. The combination of a high-precision amplifier and a 24-bit A/D sampling card ensures the accuracy of nitrogen measurement from ultra-low to high-volume ranges. The detection system adopts low drift, high accuracy, large range, high sensitivity thermal conductivity detector with low failure rate, high reliability and good stability.
Use of oxygen nitrogen analyzer
Oxygen nitrogen analyzer is often used in many experiments. It is also widely used for its ability to help detect many trace elements in specific situations.
Since the oxygen content in the air is as high as 21%, it is easy to contaminate and interfere with the sample if it is not handled properly when performing oxygen content analysis, especially trace oxygen analysis. The main reason for incorrect data in the analysis results is an improper operation of the oxygen and nitrogen analyzer. The following are several factors that affect the determination.
A. Leakage
The oxygen and nitrogen analyzer must be rigorously tested before it is put into use for the first time. Use an instrument that is strictly leak-free to obtain accurate data results. If there are any connection points, welding joints, and valves are not strictly sealed allowing oxygen in the air to penetrate inside the pipes and instruments, leading to the result of high oxygen content.
B. Contamination
When using the instrument repeatedly, the first thing to watch for is air leakage when connecting the sampling line. The operator must also be careful to blow out the leaking air and try not to allow large amounts of oxygen to pass through the sensor to prolong its life of the sensor. In the process of piping system purification, there must be certain methods in order to shorten the purification time. In general, high-pressure gas venting and low-flow blowing can quickly purify the pipeline.
C. Simplification and cleaning of gas passage systems
Various fittings, valves, gauge heads, and other components should be eliminated, as microanalysis requires the elimination of various dead spots that could cause sampling gas and thus avoid contamination. Therefore, the air circuit system should be simplified as much as possible and connectors with small dead space should be selected. In addition, water seals, oil seals, wax seals and other devices must be avoided to prevent dissolved oxygen from escaping and causing contamination and to avoid adding easily contaminated purification equipment to the piping where the sampled gas flows into the instrument inlet. Only in this way can we be sure that the system is clean and the data obtained is accurate.
How to buy oxygen nitrogen analyzer?
If you are interested in our Oxygen Nitrogen Analyzer or have any questions, please write an e-mail to info@antiteck.com, we will reply to you as soon as possible.