Oxygen Nitrogen Hydrogen Analyzer

Content
1. What is oxygen nitrogen hydrogen analyzer?
    1.1 Working principle of oxygen nitrogen hydrogen analyzer
    1.2 Feature of oxygen nitrogen hydrogen analyzer
2. Use of oxygen nitrogen hydrogen analyzer
3. How to buy oxygen nitrogen hydrogen analyzer?

Oxygen nitrogen hydrogen analyzer is an analytical instrument used in the field of chemical and metallurgical engineering. It is based on pyroelectric sensor and thermal conductivity detector technology and uses the inert gas fusion method to quickly measure the oxygen and nitrogen content in steel, rare earth materials, alloys, copper, zirconium, titanium, ceramics, powdered materials and other inorganic materials.

The analyzer is composed of a pulse furnace infrared detection integrated machine, computer, electronic balance, printer and chiller. It can determine the content of oxygen and nitrogen in various steel, non-ferrous metals and new materials respectively by splitting the non-decomposition infrared detector and thermal conductivity detector under an inert atmosphere by pulse heating decomposition specimen.

The instrument has a wide measurement range. When analyzing a sample, the sample is weighed and placed in the sample port and then flushed with a carrier gas to prevent atmospheric (containing oxygen and nitrogen) gas from entering the furnace system. The graphite crucible is degassed in the pulsed furnace to minimize self-contamination. After a stabilization phase, the sample is dropped into the crucible and melted, the oxygen in the sample reacts with the carbon in the graphite crucible to form carbon monoxide, nitrogen and hydrogen are released as monomers, and the carrier gas and sample gas pass through a dust filter before entering the copper oxide catalytic furnace to oxidize carbon monoxide to carbon dioxide.

Oxygen, nitrogen and hydrogen in metallic and non-metallic solid materials are detected using the inert gas melting principle. For the determination of oxygen, nitrogen and hydrogen, the weighed specimen is placed in a graphite crucible and melted by high-temperature heating in a gas stream of helium (argon is used for oxygen alone). The oxygen in the specimen reacts with the carbon in the graphite crucible to form carbon monoxide and the nitrogen in the specimen escapes as nitrogen. After passing through the reformer the gas mixture is sent to an infrared detection cell where the CO2 is detected. Then, the carbon dioxide and water in the IR-detected gas mixture are adsorbed and the remaining mixture of nitrogen, hydrogen, and helium is detected through the thermal conductivity cell.

Both nitrogen and hydrogen are extracted in molecular form and are generally detected by a thermal conductivity cell. There are individual instruments in which hydrogen is detected by first converting hydrogen into water vapor and using an infrared detection cell to detect the concentration of water vapor for hydrogen detection.

a. The instrument is a whole structure of upper and lower parts. The lower part is the circuit control and water tank part, the upper part is the sample-making part.

b. The temperature control accuracy can reach ±1℃. Its temperature display is intuitive with accurate readings, and can also adjust the error caused by the aging of the temperature sensor.

c. Adopt high-quality steel plate forming and processing. The surface adopts an electrostatic spraying process, sturdy and durable, while the inner liner and upper cover are made of high-quality stainless steel plate, with strong corrosion resistance.

d. Heated by electric heaters and regulated by solid state relays (the advantage of solid-state relays is that there is no obvious contact, high safety factor and high precision).

e. Safety seal without leakage. Design pressure is 4MPa.

f. The glass cylinder for making samples adopts a seal and safe clamping system.

g. It is connected by imported quick coupling, which is convenient and durable without leakage.

h. It is easy to use and maintain.

i. Oxygen nitrogen hydrogen analyzer adopts modular integrated design. It consists of four independent modules, namely pulse electrode furnace, gas circuit system, circuit system and detection system, which are integrated into a floor-mounted mainframe.

j. It has automatic zero adjustment and high and low range automatic switching functions. It adopts a general 64-bit computer to realize the control of the whole machine, 32-bit embedded ARM microcomputer control and d data acquisition system in the main machine to achieve high control accuracy and speed.

k. High heating temperature of pulse electrode furnace. Adopting programmed power control can provide a variety of programmed heating methods such as constant power heating, ramp heating, segmental heating, etc. to improve the analysis accuracy, which is suitable for rapid analysis of low melting point materials such as aluminum alloy to high melting point materials such as tungsten alloy.

l. One instrument is used to analyze oxygen, nitrogen and hydrogen in solid inorganic substances.

m. With the newly designed feeding device, granular and chip samples can be added directly to the pulsed furnace without being wrapped in tin or nickel foil.

n. Pulse heating can reach high temperatures above 3000 degrees, which is suitable for metal and ceramic sample analysis.

o. Oxygen, nitrogen and hydrogen analyzer uses thermal extraction analysis technique to determine the residual hydrogen in the sample by heating the sample at a temperature below the melting point.

p. 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 and fractional nitrogen of various oxides and nitrides respectively.

Oxygen nitrogen hydrogen analyzer is a high-quality intelligent precision instrument, which realizes most functions through software. For example, parameter setting, parameter correction, upper/lower limit alarm setting, instrument zero-point, range correction, output linear analog signal adjustment, real-time data transmission, etc. The detector of the instrument adopts the principle of zirconium oxide solid electrolysis. At a high temperature of 700°C, the potential difference of the detector varies with the proportional logarithm of the partial pressure of oxygen between the positive and negative electrodes. Therefore, the instrument can achieve fast and accurate measurement of the oxygen content in the sample gas.

The instrument should be cleaned of the furnace and electrodes every 50 analyses. Replace all chemicals every 500 analyses. Solid sodium hydroxide also changes its color (becomes light gray) when it absorbs water. If the absorbent clumps, it indicates that the magnesium perchlorate is saturated. The absorbent must be changed before it is completely caked. In addition to filling the reagent tube with reagent, some lead-free glass wool should be stuffed at the bottom of the tube. The filling thickness of glass wool should be filled in strict accordance with the instructions, because too thick will block the gas path, and too thin when the magnesium perchlorate particles will be deposited through the glass wool at the bottom of the tube, causing serious damage to the instrument.

Replace the electrode every 1000 analyses or when the electrode material turns grayish white. Since the furnace is in a high-temperature environment, the graphite base and the upper electrode wear out and must be replaced at all times. Otherwise, there will be holes or even no contact between the crucible and the upper electrode so that there will be no current.

Replace the rare earth copper oxide catalyst in the catalytic furnace every 3000 analyses and clean the electrodes with a brush from the furnace chamber.

The O-rings should be checked and replaced regularly. Make sure not to damage the sealing area when taking off the old O-ring. The groove where the O-ring is placed must be wiped clean and coated with vacuum silicone grease. Apply vacuum silicone grease after the O-ring is installed, otherwise, the O-ring will turn with the glass tube.

Prevent the glass tube from getting dust, and replace the quartz wool as soon as it is stained with dust.

a. Before the initial activation, the connection points, welding joints and valves should be checked for leaks to ensure that the oxygen in the air will not back-bleed into the pipeline and the inside of the instrument, causing high measurement values.

b. Before using the instrument again, the pipeline system should be purified to remove the air leaked into the clean and ensure that no air is leaked into the sample pipeline when it is connected.

c. The change of oxygen content in the sample gas will be affected by the pipe material and surface roughness, so generally the connection pipeline is made of copper or polished stainless-steel pipe, instead of plastic or rubber pipe.

d. When performing trace element analysis, it is necessary to avoid contamination of the sample gas by various fittings, valves, meter heads and other dead ends. Therefore, the gas circuit system must be simplified as much as possible, and the dead ends of the connections should be small to prevent contamination caused by the escape of dissolved oxygen. It is recommended to use a water seal, oil seal and wax seal.

If you are interested in our oxygen nitrogen hydrogen analyzer or have any questions, please write an e-mail to [email protected], we will reply to you as soon as possible.