Multifunctional standard gas generator

A standard gas and generating device technology, applied in gas generating devices, preparation of test samples, chemical instruments and methods, etc., can solve the problems of high process and operation requirements, unattainable, poor reproducibility, etc., and achieve gasification efficiency High, short stabilization time, good stability

Active Publication Date: 2016-04-20
李圣彭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] (3) Poor reproducibility The accuracy of gas standard substance preparation by diffusion method is greatly affected by the size of diffusion tube or diffusion cell and capillary, system temperature and pressure [Chi Xidong, Cui Jiusi, Cui Jiusi, Jing Haining. Benzene Diffusion Tube Gas Standard The development of substances [J]. China Environmental Health, 2000, 3 (3, 4): 85-91], so it needs to be strictly controlled. For example, when the temperature changes by ±0.1°C, the change of its diffusivity can reach ±0.49%. Higher requirements for the process and operation of the verification device [Fang Zheng. A verificatio...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0050] Set the temperature of the first syringe to 40°C and the gas flow to 200mL min -1 , absolute ethanol (40°C density 0.7722g·mL -1 ) The output concentrations of standard substances (assumed to be 100% pure) are 0.0750 and 0.1500 mg·L respectively -1 . Connect the multifunctional standard gas generating device to the breath alcohol content detector (fuel cell electrochemical detector), and the average value of the 10 breaths displayed by the detector is 0.0650 and 0.1409mg·L respectively -1 .

Embodiment 2

[0052] The standard gas outlet prepared by the multifunctional standard gas generating device of the present invention is connected with the gas chromatograph inlet through the six-way valve, and the gas chromatography conditions are set so that the six-way valve is opened every minute. Set the temperature of the first syringe to 40°C, and the gas flow to 100, 200mL min -1 , absolute ethanol (40°C density 0.7722g·mL -1 ) The output concentration of the standard substance (assuming that the purity is 100%) is 0.0750mg L -1 . Start the gas chromatography to get image 3 and Figure 4 The chromatograms, the average peak areas were 195217.4, 190262.0, the relative standard deviations were 2.04%, 1.56%, respectively, and the relative standard deviation between the two was 1.29%.

Embodiment 3

[0054] The standard gas outlet prepared by the multifunctional standard gas generating device of the present invention is connected with the gas chromatograph inlet through the six-way valve, and the gas chromatography conditions are set so that the six-way valve is opened every minute. Set the temperature of the first syringe to 40°C and the gas flow to 100mL min -1 , benzene (the relationship between density p and temperature t°C: p=0.90005-1.0638×10 -3 t-0.0376×10 -6 t 2 -2.213×10 -9 t 3 , g·mL -1 ) The output concentrations of standard substances (assumed to be 100% pure) are 100, 500, 1000, 3000, 5000 mg·m -3 . Start the gas chromatography, take the average value of the chromatographic peak area of ​​each group as the ordinate, and the benzene output concentration as the abscissa, to obtain Figure 5 Dependence on Benzene Concentration.

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Abstract

The invention discloses a multifunctional standard gas generator, which is mainly used for preparing low concentration standard gas with a concentration of 10<-10>-100mg/m<3> (liquid standard chemicals) or a dilution degree of 1-10<12> times (gaseous standard chemicals) so as to be suitable for instrument metering or analysis method research. A stepping motor (106-1) drives liquid standard chemicals contained in a syringe (115-1) or bottled high concentration gaseous standard chemicals into a gasification device (110) through a first adapter (109-1), zero gas is introduced through a second adapter (109-2) to conduct evaporation and dilution so as to obtain standard gas chemicals with a concentration of 10<-3>-100mg/m<3> or a dilution degree of 1-10<5> times; if a lower concentration is needed, primary standard gas stored in a second syringe (115-2) is diluted in a mixer (113), and then secondary standard gas with a concentration of 10<-10>-10<-3>mg/m<3> or a dilution degree of 10<5>-10<12> times can be output through the third adapter (109-3).

Description

technical field [0001] The invention discloses a multifunctional standard gas generating device, which is mainly used for preparing liquid or gaseous standard chemicals into 10 -10 ~100mg / m 3 Or the dilution is 1~10 12 times the standard gas with any accurate concentration, which is suitable for the development, production, verification, calibration and other measurement processes or analysis methods of gas alarms or detectors. [0002] The devices and systems involved in the present invention include a primary standard gas preparation mode and a secondary standard gas preparation mode: [0003] 1. In the first-level standard gas preparation mode, [0004] (1) If the standard chemical source is in liquid state, the three-way solenoid valve (108) disconnects the first adapter (109-1) and the first gas flow controller (107-1), while the second gas flow control The device (107-2) and the first gas flow controller (107-1) are connected, and the first stepper motor (106-1) driv...

Claims

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Application Information

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IPC IPC(8): B01J7/00G01N1/28
CPCB01J7/00G01N1/28
Inventor 李圣彭
Owner 李圣彭
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