Working principle of humidity meter in wood drying kilnxingnan
Wood drying kiln is measured with a psychrometer wet dry indoor air relative humidity is not affected by temperature, wide measuring range, and simple structure, easy installation and use, reliable work.Are useful for measuring temperature and humidity, and at the same time, according to the actual enterprise meet the needs of the manual, semiautomatic and fully automatic control.
Psychrometer consists of two same thermometer.One of the heat of the thermometer outside package wrapped in gauze, gauze bottom water, the temperature outside the package of gauze moist state, which is called wet bulb thermometer, the measured temperature is called the wet bulb temperature tm with it;
Another heat bales not gauze is called a dry bulb thermometer thermometer, the measured temperature is called a dry bulb temperature is in unsaturated air, wet bulb temperature is always lower than the temperature, this is because the wet ball bulb on the evaporation heat loss as a result, this difference is called dry wet bulb temperature difference delta t, delta t = t – tm. The air is dry, moisture evaporates faster, the more heat being lost to the t is larger; On the other hand, the air is wet, the delta t is smaller, when the air is saturated by water vapor, delta t is zero, moisture to evaporate to stop.Application as long as according to the measured dry bulb temperature and wet bulb is poor, humidity table, it is dry indoor relative humidity of drying medium.