Relative humidity measurer

Abstract

The invention discloses a relative humidity measurer which comprises a 555 time base circuit, a first resistor to a seventh resistor, a capacitor, a power supply and an adjustable capacitor. An output end of the power supply is respectively connected with a first end of the third resistor and a first end of the seventh resistor. A second end of the third resistor is respectively connected with a first end of the second resistor and a seventh pin end of the 555 time base circuit. A third pin end of the 555 time base circuit is connected with a first end of the fourth resistor, a second end of which is a signal output end of the relative humidity measurer. A second end of the seventh resistor is respectively connected with an eighth pin end of the 555 time base circuit and a first end of the sixth resistor. By the use of the relative humidity measurer, problems such as insufficient measurement accuracy and high power consumption existing in a relative humidity measurer in the prior art are solved. The relative humidity measurer provided by the invention has popularization and use value.

Description

technical field [0001] The invention relates to an environment monitoring instrument, in particular to a relative humidity measuring instrument. Background technique [0002] There are three basic forms of humidity, namely water vapor pressure, relative humidity, and dew point humidity. Water vapor pressure (formerly known as absolute humidity) indicates the pressure of the water vapor part in the air, the unit is hectopascal (hPa) and takes one decimal place; the relative humidity is the difference between the actual water vapor pressure in the air and the saturated water vapor pressure at the current temperature It is expressed as a percentage of the ratio, and it is an integer; the dew point humidity is the temperature when cooling reaches saturation under the condition of constant water vapor content and air pressure in the air, and the unit is expressed in degrees Celsius (°C), with one decimal place. Equipped with a hygrometer can also measure the continuous record of...

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Problems solved by technology

[0004] Therefore, in many occasions and environments, it is necessary to monitor the humidity all the time to ensure that the humidity is within the range suitable for human survival. , Coulomb hygrometer, optical hygrometer, gas chromatography, chemical substance electrical characteristic method, ion crystal condensation hygrometer, etc., the relative humidity measuring instrument of the prior art has the problems of insufficient measurement accuracy and large power consumption

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