Standard gas preparation device

Abstract

The invention discloses a standard gas preparation device, which comprises a gas distribution cylinder, wherein a piston is arranged in the gas distribution cylinder. A first air inlet of the gas distribution cylinder is connected with a first gas cylinder through a first gas transmission pipe, and a second air inlet of the gas distribution cylinder is connected with a second gas cylinder througha second gas transmission pipe. The first gas transmission pipe and the second gas transmission pipe are respectively provided with a first gas port and a second gas port, and the first gas port and the second gas port are respectively provided with a first gas bag and a second gas bag. A first valve and a second valve are respectively arranged on the first gas transmission pipe on the gas outletside and the gas inlet side of the first air bag, and a third valve is arranged on the first air port. The second gas transmission pipe is provided with a fourth valve and a fifth valve on the air outlet side and the air inlet side of the second gas bag, respectively. The device can not only flexibly prepare a certain volume of standard gas according to the needs, but also ensure that the pressureof the standard gas meets a standard atmospheric pressure.

Description

technical field [0001] The invention relates to the technical field of detection experiment devices, in particular to a preparation device for preparing standard gases. Background technique [0002] At present, direct injection-gas chromatography is used for the detection of some organic toxicants in the workplace, and a series of standard gases need to be prepared to create a standard curve. [0003] The current devices used to prepare standard gases mainly have the following problems: [0004] First, due to the limitation of the volume of the container, only a certain volume of standard gas can be prepared, and the gas distribution volume cannot be flexibly controlled according to the needs. [0005] Second, the traditional preparation device needs to inject base gas and raw material (liquid or gas) separately when distributing gas, and needs to calculate the volume of base gas and raw material according to the volume of the container before preparation, the operation is ...

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Problems solved by technology

[0004] First, due to the limitation of the volume of the container, only a certain volume of standard gas can be prepared, and the gas distribution volume cannot be flexibly controlled according to the needs

[0005] Second, the traditional preparation device needs to inject base gas and raw material (liquid or gas) separately when distributing gas, and needs to calculate the volume of base gas and raw material according to the volume of the container before preparation, the operation is more complicated and error-prone

[0006] Third, the pressure of the standard gas prepared by the traditional preparation device often cannot strictly meet a standard atmospheric pressure, resulting in inaccurate concentration when extracting the standard gas, which affects the accuracy of detection

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