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.