Formaldehyde module calibration device and using method thereof

Abstract

The invention discloses a formaldehyde module calibration device. The device comprises a calibration box with a containing cavity, a heating piece, a micro syringe, a fan, at least one auxiliary circuit board and at least one formaldehyde module to be calibrated. The heating piece is used for rapidly evaporating a formalin solution for calibration and fixed in the containing cavity of the calibration box; the micro syringe is used for placing the formalin solution on the heating piece; the fan is used for ensuring uniformity of formaldehyde gas in the calibration box; the auxiliary circuit boards are connected to a computer through circuits, disposed in the containing cavity and electrically connected to the formaldehyde modules. A constant volume volatilization method is adopted in combination with formaldehyde in national standards and a methanol quantification method for calibrating the formaldehyde modules, the low cost and batching of calibration of the formaldehyde modules are achieved, the required concentration of formaldehyde gas can be freely generated, and the advantages of selective calibration of formaldehyde, batched calibration and the like can be achieved.

Description

technical field [0001] The invention relates to the technical field of sensor calibration, in particular to a formaldehyde module calibration device. Background technique [0002] For module producers and users, it is very necessary to calibrate the module quickly and easily, which requires us to have an accurate calibration gas source and be able to eliminate the influence of other possible interfering gases. At present, there are 4 methods to calibrate the formaldehyde module, which are gas cylinder mixing method, volatilization method, diffusion method and permeation tube method. [0003] The gas cylinder mixing method is to mix the formaldehyde gas contained in the cylinder with other inert background gases to generate a formaldehyde standard gas with a specific concentration, and then place the formaldehyde module to be calibrated in the standard gas environment for calibration. The disadvantage of this method is that the formaldehyde gas is extremely unstable and will...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a low-cost, simple and easy way to calibrate the formaldehyde module for the problems in the prior art that the source of the calibration gas cannot be obtained simply and accurately, or the influence of the interfering gas cannot be eliminated. The device and its use method can selectively calibrate formaldehyde and batch calibration

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