Principle of measuring humidity: The oscillation frequency of a quartz crystal coated with hygroscopic material is a very sensitive detector of the weight of absorbed water because very small changes in frequency can be measured. Working of Piezoelectric meter: Two quartz crystal oscillators are used, alternating between moist and dry gas, generally for 30 seconds …
Humidity measurement using the piezoelectric sensor Read More »
Hygrometers are humidity sensors, The hair hydrometer is a type of absorption hydrometer and uses the technique of mechanical moisture detection. Principle of Hair hygrometer Due to humidity, several materials undergo a change in physical, chemical and electrical properties. This property is used in a transducer designed and calibrated to directly read the relative humidity. …
Hair hygrometer, principle operation and application Read More »
Humidity can be measured using materials that absorb water vapor, giving a change in their characteristics that can be measured; by measuring the latent heat of evaporation; by dew point measurement; or by microwave absorption. There are two types of meters, Psychrometers & Hygrometers. Psychrometers: A psychrometer uses the latent heat of vaporization to determine relative …
Humidity Measuring Devices – Psychrometers & Hygrometers Read More »
Introduction Sling Psychrometer is used to measure both the dry bulb and wet bulb temperatures at time. These temperatures are a measure of humidity content in air. Description of Sling Psychrometer The main parts of the instrument are There are 2 thermometers in this instrument. 1.Dry bulb thermometer, whose sensor bulb is in direct contact …
Capacitance is one of the most common forms of humidity measurement. Humidity sensors are typically used in building controls. The most effective location for a wall mounted sensor is near the return air duct, where the air leaving the room has the best averaged humidity. Principle: Capacitive Humidity instrument uses the principle of capacitance equation C – …