Pressure stabilizing sampling device

A technology of stable pressure and sampling device, applied in the direction of sampling device, etc., can solve the problems of large pressure changes and unstable pressure of the instrument, achieve the effect of improving accuracy and ensuring the repeatability of sample injection

Active Publication Date: 2014-10-29
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
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Problems solved by technology

[0006] The purpose of the invention of this application is to solve the technical problems that the sampling pressure of the current atmospheric environment gas monitor

Method used

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  • Pressure stabilizing sampling device

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Embodiment Construction

[0018] Such as figure 1 As shown, the pressure stable sampling device of this embodiment includes a sampling tube 1, a pressure stabilizing chamber 2 and a gas monitoring instrument 3, the sampling tube 1 is connected to the air inlet of the pressure stabilizing chamber 2, and the outlet pipe of the pressure stabilizing chamber 2 passes through a multi-point The branch pipes are connected to the gas monitoring instrument 3, and each branch pipe is connected to a certain gas monitoring instrument 3. The inlet end of the sampling pipe 1 is provided with a first flow meter 4 and a flow restrictor 5 in turn, and the pressure stabilization chamber 2 also has a connection control The port of the device 6, the control device 6 includes a second flowmeter 7, a proportional control valve 8, a vacuum pump 9 and a PC 10, the pressure stabilization chamber 2 is connected with the vacuum pump 9 through a ventilation pipeline, and the second flowmeter 7 is installed on the ventilation pipeli...

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Abstract

The invention discloses a pressure stabilizing sampling device. The pressure stabilizing sampling device comprises a sampling pipe, a pressure stabilizing cavity, a control system and a gas monitoring meter; the sampling pipe is communicated with a gas inlet of the pressure stabilizing cavity; one way of the pressure stabilizing cavity is connected with multiple branch pipes; each branch pipe is communicated with the gas monitoring meter; the gas charge end of the sampling pipe is sequentially provided with a first flow rate meter and a flow limiting device; the pressure stabilizing cavity is connected with the vacuum pump by a gas introducing pipeline; the gas introducing pipeline is provided with a second flow rate meter and a proportion regulating valve. The pressure stabilizing sampling device provided by the invention can enable the sample charge pressure to be kept at a constant value so as to guarantee the sample charge repeatability; the internal pressure of an instrument can be regulated by the pressure stabilizing cavity and a regulating device, so that the pressure intensity in the instrument keeps a constant value; the aerial survey flight height environment requires that calibration is not necessary in the condition of being lower than the constant value, so that the uncertainty caused by pressure change due to the height change of an aircraft is reached, and the data precision of the gas monitoring instrument in aerial survey is improved.

Description

technical field [0001] The invention relates to a voltage-stabilizing sampling device, in particular to a voltage-stabilizing sampling device used in aerial surveys. Background technique [0002] In aerial surveys, analytical instruments are usually used to monitor the concentration of gas samples. In order to accurately analyze and measure the concentration of gases, it is necessary to ensure that the sampling process has good repeatability (that is, the repeatability of multiple sampling gas monitoring results). The stable pressure during sample injection is an important condition to ensure the repeatability of sample injection, but in the aerial survey, due to the change of flight altitude, the real-time change of external pressure brings difficulties to control the sample injection pressure. [0003] The existing atmospheric environment gas monitoring instruments used on the ground can be placed in a specific environment (generally set to 0.6 atmospheric pressure on the ...

Claims

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Application Information

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IPC IPC(8): G01N1/24
Inventor 白志鹏王歆华杨文张文杰韩斌耿春梅张蕊
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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