Instrument Introduction:
Beijing Dongxi Analytical Instrument Co., Ltd. has successfully developed and researchedEW-4400 portable photoionization gas detectorBecoming the first domestic manufacturer to industrialize the production of portable photoionization gas detectors. This product has independent intellectual property rights and characteristics in China.
This chromatograph is a high-tech product that integrates spectroscopy, vacuum technology, precision machinery, new materials, new processes, electronics, integrated circuits, computers, chromatographic analysis, and other interdisciplinary fields.
This product uses a long-life vacuum ultraviolet light source, which has high sensitivity, low detection limit, wide linear range, and does not require hydrogen gas, combustion assisting gas, any chemical reagents, or sample pretreatment during analysis. It can be used for trace analysis of both organic compounds and some inorganic compounds. Due to its high sensitivity, it can directly sample and analyze indoor environments without the need for thermal analysis.
The main performance indicators of this portable photoionization gas detector have reached the best level of similar foreign products.
The development of this instrument is also one of the key projects supported by the Technology Innovation Fund for Science and Technology Enterprises of the Ministry of Science and Technology in 2005. Easy to use, fast analysis speed, high sensitivity, overcoming the characteristics of traditional analysis methods such as slow speed and cumbersome preprocessing.
It will be widely used in fields such as environmental protection, monitoring of indoor environmental pollution, food safety, national defense against chemical and anti-terrorism warfare, aerospace, scientific research and new product development, as well as other departments that require trace gas (vapor) analysis.

Main detectable compounds:

1 ppb: Ethylene oxide, vinyl chloride, chloroethane, benzene, toluene, xylene, ethane, alkanes (up to octane), isoprene, ethylene, propylene, butene, dichloromethane and other chloromethane, light chlorobenzene, hydrogen sulfide, light thiols, organic sulfur (up to dimethyl disulfide), acetone, methyl ethyl ketone, arsine, phosphine, acetaldehyde, aldehydes (up to hexanal), etc.
50ppb: Ethylene glycol lipids, fluorochloromethane (Freon), methyl isocyanate, chloroethane, cyclohexanone, ethyl acrylate, light alcohols, etc.
The compounds listed here are only some of the compounds that can be detected by this instrument, not all of them. In principle, all gas (vapor) compounds with ionization potentials below 10.6eV can be detected.


Main features:
1. Using photons to achieve sample ionization without a radioactive source
2. High sensitivity, low detection limit, wide linear range
3. The instrument is lightweight and flexible, especially suitable for on-site analysis and emergency detection of environmental pollution accidents
4. No need for hydrogen, combustion supporting gas, or high-purity nitrogen, only air is used as the carrier gas
5. Non destructive testing, safe and reliable
6. Analysis of organic volatile compounds in water, without the need for a blowdown capture device, with headspace sampling and direct injection detection
7. No need for chemical pretreatment, concentration, enrichment, adsorption thermal desorption. Direct injection analysis yields accurate and reliable results
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8. A data processing workstation consisting of a data collector, laptop, and corresponding software for data collection
Analysis, calculation, display, and storage