Humidity sensor for wet and dry bulbs with external dry bulbs

Abstract

The invention discloses a humidity sensor for wet and dry bulbs with external dry bulbs, which comprises a semi-enclosed shell. An upper water cup, a wet bulb thermometer, and a piece of gauze of which one end is positioned inside the upper water cup and the other end wraps the end part of the wet bulb thermometer are arranged inside the semi-enclosed shell. The technical key point comprises that: a ventilating device used for regulating the vapor evaporation rate of the surface of the wet bulb thermometer is arranged inside the semi-enclosed shell, and a dry bulb thermometer used for detecting the environment temperature is arranged outside the semi-enclosed shell. The humidity sensor can be used under the severe conditions of acid, alkali, dust particle, temperature and humidity alternating, and high temperature and humidity, and the like. The humidity sensor has the advantages of high accuracy, good stability, low cost, easy maintenance, difficult damage, and the like.

Description

[technical field] [0001] The invention relates to a device for measuring relative humidity in a digital display electric ventilated psychrometer, which is composed of two thermometers, a water cup and a radiation protection tube, and is commonly called a psychrometer humidity sensor. [Background technique] [0002] In the departments of industrial and agricultural production, meteorology, environmental protection, national defense, aerospace, scientific experiments, product testing, etc., it is often necessary to measure and control the environmental humidity, especially in scientific experiments, product testing, especially product feasibility tests, the control of temperature and humidity Both control and measurement are strictly regulated. Compared with temperature measurement, humidity measurement is much more complicated. Temperature is an independent measured object, while humidity is affected by other factors (acid, alkali, dust particles in the measured object, atmos...

AI Technical Summary

Problems solved by technology

In high temperature (such as 50℃~99℃) and high humidity (such as 80%RH~99%RH) environment, the dry bulb thermometer is easy to be in a wet state or even stained with water droplets, and it encounters a wind speed of about 2.5m / s At this time, the temperature detected (reflected) by the dry bulb thermometer is not the ambient temperature (smaller than the ambient temperature), which significantly affects the relative humidity measurement error and limits the working temperature range of the ventilated psychrometer.

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