GDS-L2 Liquid Organic Solvent Gas Distribution System Introduction: The liquid organic solvent gas distribution system can be configured with standard gases of various concentrations of liquid solvents. This system can achieve gas distribution for multiple media and concentrations. The software interface is user-friendly and easy to operate. The corresponding standard gases prepared can be widely used in various departments and industries such as environmental monitoring, disease control centers, traffic safety, military industry, home decoration and building materials, petroleum, chemical industry, research institutes, etc; Volatile gases such as ethanol, methanol, and ether can be prepared as liquid solvents VOC、 Acetone, benzene, cyclopentane, epoxyethane and other organic gases are used for the calibration, calibration and analysis of online monitoring and analysis instruments, portable analytical instruments, laboratory analytical instruments, sensors, etc., as well as the use of fixed value standards for analysis methods. The gas mass flow controller is used to control the gas mass flow rate in real time, and a fully automatic micro injection liquid solvent gas generator is used to achieve full automation of the gas distribution process, realizing the dilution and preparation of standard gases. characteristic: 1. Fully automatic injection system: No need for manual calculation of liquid injection volume, no need for manual liquid injection, reducing human error and improving gas distribution accuracy 2. Adopt high-precision and high stability mass flow controller 3. Equipped with flow mode, concentration mode, and programmable mode 4. High precision and good stability 5. High degree of intelligence, fully automatic microsampler injection, no need for manual intervention 6. 7 "LCD touch screen 7. The entire gas path is made of polytetrafluoroethylene or 316L stainless steel pipes, with anti-corrosion and anti adsorption treatment Technical parameters: Gas type: Suitable for standard gas configurations that are liquid solvents at room temperature Dilution gas: nitrogen or air Gas distribution principle: principle of mass flow mixing method Number of channels: 1 channel (can be customized to simultaneously prepare multiple liquid organic solvents) Flow range: Dilution gas flow rate: 0-5000ml/min (customizable) Carrier gas flow rate: 0-200ml/min (customizable) Concentration range: 10ppb∽1000ppm Flow accuracy: ± 1.0% F.S Valve accuracy: ± 2.0% F.S Dilution ratio: recommended within 1000:1 (customizable) Input pressure: 0.2∽0.5MPa Vaporization temperature: 0-300 ° C Operating temperature: -10 ° C to 70 ° C Humidity range: ≤ 80% RH (non condensing) Working power supply: 220VAC, 50 ± 0.5Hz External dimensions: 480X380x320mm Weight: Approximately 12kg
1. Principle Liquid organic solvents are liquids at room temperature and have strong volatility. By using an industrial syringe to quantitatively transport organic solvents and heating them to a set temperature, while vaporizing them into a high concentration mixture under the action of a carrier gas, the high concentration mixer is mixed with diluent gas to prepare low concentration mixtures of different concentrations as required. 2. Purpose: The corresponding standard gases formulated with this product can be widely used in various sectors and industries such as environmental monitoring, disease control centers, traffic safety, military industry, home decoration and building materials, petroleum, chemical industry, etc. Organic volatile compounds such as ethanol, methanol, * * VOC、 The use of testing instruments and analyzers for all organic volatile compounds such as formaldehyde, acetone, benzene, cyclopentane, and ethylene oxide, as well as calibration and analysis methods, and setting standards. 3. Gas path 3.1 Air Circuit Design It is a gas-liquid mixed gas distribution system. The air source is compressed air, which is connected to the instrument air inlet through a pressure reducing valve. There are two branches inside the instrument, one for the carrier gas and the other for the dilution gas. Two gas channels are equipped with high-precision mass flow controllers, which can adjust and set the instantaneous flow rate of the gas in real time. Liquid organic solvent is filled in a transparent container, and the liquid level indicator can be observed. Set up an organic solvent injection port, and when the solvent is insufficient, you can directly open the organic solvent injection port to add it directly. The mixing chamber has two air outlets, one of which is a mixed gas outlet; The other is the exhaust outlet for mixed gases. The main exhaust port is located on the rear panel of the equipment and can be directly discharged to the outside through an air duct, ensuring that indoor air is not polluted and also considering the safety of experimental personnel. 3.2 Design of System Mixing Chamber Before the liquid organic solvent mixture enters the mixing chamber, its concentration is uneven. In order to make its concentration uniform, we designed a distribution plate; There are two air distribution plates inside the mixing chamber, one of which is a single hole air distribution plate and the other is a porous air distribution plate. The organic solvent standard gas enters through the holes of the single hole air distribution plate, and the incoming gas collides with the multi hole air distribution plate, achieving the mixing effect with the prepared standard gas. In order to obtain the desired concentration, dilution gas was added before the mixing chamber, and different concentrations of VOC mixtures were obtained by changing the flow rate of the dilution gas. 3.3 Selection of System Materials All pipelines are made of polytetrafluoroethylene material to reduce the adsorption of organic solvents on the pipe wall and ensure the accuracy of the target concentration. 4、 Main equipment and structure 1. Liquid quantitative conveying device The use of industrial injection pumps is to transport liquid organic solvents to the gasification chamber according to the set concentration. The syringe can be replaced according to different concentration requirements. Syringe capacity: generally ranging from 5ul to 1000ul Channel: 1 way 2. Gas mass flow controller: Adopting gas mass flow controllers from both domestic and international sources. Flow meter situation: 1. Model: F-201CV Flow rate: 0-500 sL/min 2. Model: F-201CV Flow rate: 0-10 sL/min 3. Human computer interface Adopting a commercial desktop computer with basic functions such as data display and monitoring. Software functions: 1. Display the flow rates of carrier gas and diluent gas 2. Set the flow rates of carrier gas and dilution gas 3. Concentration mode and flow mode 4. Set the gas distribution concentration and display concentration
