• Sinotech Steel Research NAK Oxygen, Nitrogen and Hydrogen Analyzer, in 1977, was the first to develop a vacuum melting gas analyzer. In 1991, the pulse infrared oxygen analyzer was industrialized here, breaking the foreign monopoly. Through 40 years of technological accumulation, Sinotech Steel Research NAK's oxygen, nitrogen and hydrogen analyzer has received good market feedback and customer recognition.
• The ONH3500 oxygen, nitrogen and hydrogen analyzer is a newly launched gas analysis instrument product by Sinotech Steel Research NAK in 2022. The instrument can be equipped with two independent infrared detection channels, respectively detecting high oxygen and low oxygen, and one thermal conductivity detector, achieving the detection of high and low ranges of nitrogen and hydrogen. The pulse furnace adopts circulating water cooling, and the sample can be heated to 3500℃ high temperature in the graphite crucible of the high-power pulse furnace. This instrument has the advantages of high sensitivity, good performance, wide measurement range and accurate and reliable analysis results. The ONH3500 oxygen, nitrogen and hydrogen analyzer can be widely used in the detection of oxygen, nitrogen and hydrogen content in solid inorganic materials in the fields of steel metallurgy, powder metallurgy, non-ferrous metals, ceramic materials, electronic materials, geological minerals, aerospace, scientific research institutes, and third-party testing.

Instrument Features
• The instrument adopts a split structure design. The pulse furnace system and the detection unit are housed in two separate enclosures, effectively preventing electromagnetic interference from the pulse furnace to the detector.
• It uses non-dispersive infrared detection technology (NDIR) for oxygen measurement and high-sensitivity thermal conductivity detection technology for nitrogen and hydrogen measurement.

It adopts an antioxidant and stable infrared light source, with a strong original light intensity signal and a good signal-to-noise ratio.

• It adopts a mechanical modulation design with a high-precision chopper motor and a high-performance pyroelectric solid-state infrared detector with a light cone focusing design, featuring high sensitivity.
• The thermal conductivity detector uses a pair of thermal conductivity wire thermistor structure, a breathing constant current source control method, and a small current control technology. It is equipped with inert gas protection for the thermosensitive elements to prevent oxidation, ensuring excellent long-term stability.

• The pulse furnace heating adopts power control mode and programmed temperature rise, which is not easily affected by the material and size of the crucible.
• The high-efficiency and simple all-metal analysis gas path ensures good airtightness and reduces analysis costs.
• During the analysis process, automatic switching between high and low range channels can be achieved.
• The humanized software operation mode enables real-time monitoring of key parameters of the instrument.
• Key components use original imported parts, which have superior performance and long service life.