Hygrometer Humidity
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 MINI INDOOR WALL HYGROMETER THERMOMETER WET HUMIDITY $1.55 (2 Bids) Time Remaining: 1d 6h 52m |
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 MINI INDOOR WALL HYGROMETER THERMOMETER WET HUMIDITY $2.25 (4 Bids) Time Remaining: 1d 7h 23m |
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 In Outdoor Digital C F Thermometer Humidity Hygrometer $5.39 Time Remaining: 2d 7h 7m |
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 MINI INDOOR WALL HYGROMETER THERMOMETER WET HUMIDITY $0.99 (1 Bid) Time Remaining: 2d 8h 33m |
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 Digital LCD Indoor Humidity Thermometer Hygrometer TL8005 $4.39 Time Remaining: 25d 19h 18m Buy It Now for only: $4.39 |
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 LCD 3 IN 1 Indoor Thermo Humidity Hygrometer Clock B3 $10.67 Time Remaining: 25d 14h 29m Buy It Now for only: $10.67 |
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 Digital Indoor Outdoor Thermometer Humidity Hygrometer $1.00 Time Remaining: 27d 22h 21m Buy It Now for only: $1.00 |
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 LCD Digital Thermometer Humidity Hygrometer TH 4 $6.39 Time Remaining: 28d 21h Buy It Now for only: $6.39 |
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 LCD Digital Temperature Humidity Meter Hygrometer Clock $6.79 Time Remaining: 4d 13h 57m Buy It Now for only: $6.79 |
 Digital Indoor Dual Humidity Temperature Comfort Monitor Gauge Hygrometer $17.69 (1 Bid) Time Remaining: 2d 6h 53m |
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 Digital Indoor Outdoor Thermometer Humidity Hygrometer $1.00 Time Remaining: 1d 4h 36m Buy It Now for only: $1.00 |
 LCD Digital Indoor Thermometer Hygrometer Humidity Meter TL8025 $4.24 (8 Bids) Time Remaining: 16h 7m |
 LCD Desk Wet Digital Thermometer Meter Moonphase Time Hygrometer Humidity C $8.74 Time Remaining: 13d 12h 30m Buy It Now for only: $8.74 |
 LCD Digital Indoor Thermometer Hygrometer Humidity Meter TL8025 $3.88 (8 Bids) Time Remaining: 1d 16h 45m |
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 MINI INDOOR WALL HYGROMETER THERMOMETER WET HUMIDITY 1 $4.79 Time Remaining: 12d 14h 14m Buy It Now for only: $4.79 |
 LCD Digital Indoor Thermometer Hygrometer Humidity Meter TL8025 $2.90 (6 Bids) Time Remaining: 2d 17h 23m |
 Indoor Wall Mountable Humidity Thermometer Hygrometer $6.27 Time Remaining: 1d 7h 40m Buy It Now for only: $6.27 |
Hygrometer Humidity
The Development Trend Of Humidity Sensor
In the industrial and agricultural production, weather, environmental protection, national defense, scientific research, aerospace and other departments are often required to measure and control humidity. However, in conventional environmental parameters, the humidity is the most difficult to accurately measure a parameter. With the dry and wet bulb hygrometer or a hair hygrometer to measure humidity, the method has long been unable to meet the needs of the development of modern science and technology. This is because the measurement of humidity than the measurement of complex multi-temperature, the temperature is measured is an independent, while the humidity is affected by other factors (atmospheric pressure, temperature) effects.
In addition, the calibration of humidity is also a problem. Production abroad humidity calibration equipment prices are very expensive.
In recent years, the humidity sensor research and development at home and abroad have made great strides. Humidity sensor is moving from simple humidity sensor to the integrated, intelligent, multi-parameter detection of the direction of rapid development, in order to develop a new generation of humidity / temperature measurement and control system has created favorable conditions for humidity measurement techniques will also be raised to a new level.
The characteristics of humidity sensor
Humidity sensor is the simplest humidity sensor. Humidity sensor are mainly resistive, capacitive two broad categories.
a humidity sensitive resistor
Humidity resistance is characterized by the substrate covered by a layer of wet material with a sense of the film, when the air in the water vapor adsorbed on a sense of the wet membrane, the components of the resistivity and resistance values are changed to use this feature Humidity can be measured. Many different types of humidity resistance, such as metal oxide humidity resistance, humidity resistance of silicon, ceramic humidity resistance and so on. Humidity resistance has the advantage of high sensitivity, the main drawback is that linearity and interchangeability of products poor.
b Humidity Capacitance
Humidity capacitors are generally made with the polymer film capacitors, polymer materials commonly used in polystyrene, polyimide, cellulose acetate, etc. butyricum. When the ambient humidity changes, the capacitance of the dielectric constant humidity changes, so that it is also a change in capacitance, its capacitance is proportional to the change in relative humidity. The main advantage of capacitive humidity sensor with high sensitivity and product interchangeability is good, fast response, a small amount of moisture lag, easy to manufacture, easy to achieve miniaturization and integration, and its accuracy in general is lower than the humidity sensitive resistor. The main production abroad humidity capacitor manufacturers are Humirel company, Philips Company, Siemens Corporation. To Humirel produced SH1100-type humidity sensor capacitor, for example, the measurement range is (1% ~ 99%) RH, at 55% RH when the electrical capacity of 180pF (typical value). When the relative humidity from 0 to 100%, the changes in capacitance range is 163pF ~ 202pF. The temperature coefficient of 0.04pF / ℃, humidity hysteresis amount of ± 1.5%, response time of 5s.
In addition to resistive, capacitive humidity sensor, there are ionic-type humidity sensor, weight-type humidity sensor (with a sense of the changes in the weight of wet film to change the oscillation frequency), light intensity-type humidity sensor, SAW humidity sensor and so on.
Humidity sensor linearity and anti-pollution poor in the detection of ambient humidity, the humidity sensor to a long-term exposure to the environment under test, it is easily affected by pollution, measurement accuracy and long-term stability.
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What everyday objects absorb moisture?
I'm trying to make a simple hygrometer to know the humidity. I don't know what simple materials I could use aside from hair. Please give me some items.
It has to be something long and thin like hair but aside from that.
Well if u're looking for more technical alternative choose either silica gel , powdered charcoal or even anhydrous Calcium Chloride , all are easily available .
Hygrometer or Humidity Gauge Calibration