Standard gas preparation device and method

Abstract

The present invention discloses a standard gas preparation device and method, the standard gas preparation device comprises a hollow housing, a piston and an elastic strip, one end of the housing is closed, the other end of the housing is in coordination with the piston which is inserted in the housing, the closed end of the housing is provided with an air inlet and an air outlet, one end of the elastic strip is connected with the rear end of the piston, and the other end of the elastic strip is movably connected with the outer wall of the housing. Through connection of a bulged junction and a groove, the piston can be quickly drawn to a required volume (typically is multiple of 10ml) under the action of spring strip tensile force to complete the preparation of a standard gas, and errors during reading of the volume can be avoided.

Description

technical field [0001] The invention relates to the technical field of standard gas preparation, in particular to a standard gas preparation device and method. Background technique [0002] At present, direct sampling-gas chromatography is used for the detection of some organic toxic substances in the workplace, and a series of standard gases need to be prepared to make a standard curve. Currently, the GBZ160 detection standard uses a syringe as the preparation method of the standard gas. This method is not easy to operate and is prone to air leakage, resulting in poor linearity of the prepared standard curve and affecting the accuracy of the detection results. [0003] Chinese patent ZL201110269968.0 provides a standard gas preparation instrument, which consists of a setting unit, an MCU microprocessor unit, a carrier gas flow control unit, a peristaltic pump, and a standard gas generation unit. Its usage method is: [0004] First, set the preparation parameters in the se...

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Problems solved by technology

[0005] 1. This device is complex and expensive, and is not suitable for general laboratories;

[0006] 2. The amount of gas phase sample injection is small, and the amount of standard gas required is small. This device prepares a large amount of standard gas and uses a lot of standard substances, which is not suitable for use in testing laboratories.

[0007] 3. When the device prepares the standard gas, the standard substance needs to be transferred in the pump and the pipeline, which will cause the loss of the standard substance during the transfer process, resulting in inaccurate concentration of the preparation

[0008] 4. The device is not easy to clean, and the reagent remaining in the reagent delivery pump and pipeline will affect the preparation of other standard gases

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