Method for controlling air humidity of humiture test box and structure thereof

Abstract

The present invention discloses a temperature control method and a structure of a temperature and humidity calibration chamber. The structure comprises a working area in the calibration chamber, air in a working area passes through a desiccators for getting dry air, dry air is sent into the working area after being adjusted the temperature; air is sent into a saturator for getting saturated moisture, moisture is sent into the working area after adjusted the temperature; the ratio of dry air and moisture is adjusted to make the temperature and the humidity in the working area achieve the stable set value. The present invention adopts the separated flow way to send air, can control well the humidity in the working area, and ensure the stability of the temperature in the working area by circulating water in a constant temperature water tank. The present invention integrates the advantages of the prior temperature and humidity calibration chambers, the range of testing temperature, the humidity is large, any point of the humidity with 10 to 95 percent RH can be adjusted between 5 to 50 DEG C, and the fluctuation of the humidity is less than the range between negative 0.8 percent RH and 0.8 percent RH, which precedes 1 percent RH of the national regulation requirements.

Description

Technical field: [0001] The invention relates to a humidity control method and structure of a temperature and humidity test box, belonging to the technical field of temperature and humidity test boxes. Background technique: [0002] In the prior art, humidity test boxes are usually used to test or calibrate larger temperature and humidity meters (meters). Some existing products have single functions and can only perform humidity test at room temperature, and the working area of ​​the humidity test box Humidity is greatly affected by the outside world, and the stability and uniformity are not high, usually only up to 1.5% RH. There is also a constant temperature and humidity chamber that can test the humidity under the condition of changing the temperature of the working area, but the temperature range of the adjustment is limited, and the accuracy is lower, it can only reach 5% RH, and it is difficult to meet the high temperature and high humidity requirements, so it is far ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, humidity test boxes are usually used to test or calibrate larger temperature and humidity meters (meters). Some existing products have single functions and can only perform humidity test at room temperature, and the working area of ​​the humidity test box The humidity is greatly affected by the outside world, the stability and uniformity are not high, usually only 1.5% RH

There is also a constant temperature and humidity chamber that can test the humidity under the condition of changing the temperature of the working area, but the temperature range of the adjustment is limited, and the accuracy is lower, it can only reach 5% RH, and it is difficult to meet the high temperature and high humidity requirements, so it is far from being able to Meet national regulations and user requirements

Especially after the implementation of my country's new verification regulation "Mechanical Temperature and Humidity Meter Verification Regulations" JJG205-2005, the requirements for temperature and humidity test boxes are higher, and the existing domestic humidity test boxes cannot meet the requirements of the new regulations. The temperature and humidity test box of the new national regulations is an urgent technical problem to be solved

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