HTU21P 데이터 시트보기 (PDF) - Unspecified
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HTU21P Datasheet PDF : 21 Pages
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HTU21D(F) Sensor
Digital Relative Humidity sensor with Temperature output
APPLICATION: DEW POINT TEMPERATURE MEASUREMENT
The dew point is the temperature at which the water vapor in the air becomes saturated and condensation
begins.
The dew point is associated with relative humidity. A high relative humidity indicates that the dew point is closer
to the current air temperature. Relative humidity of 100% indicates that the dew point is equal to the current
temperature (and the air is maximally saturated with water). When the dew point stays constant and
temperature increases, relative humidity will decrease.
Dew point temperature of the air is calculated using Ambient Relative Humidity and Temperature measurements
from HTU21D(F) sensor with following formulas given below:
Partial Pressure (PPTamb) formula from Ambient Temperature:
PP 10 Tamb
A
(Ta
B
mbC
)
Dew point Temperature (Td) formula from Partial Pressure (PPTamb):
Td
B
log10
RH
amb
PPTamb
100
C
A
PPTamb
RHamb
Tamb
Td
A, B, C
Partial Pressure in mmHg at ambient temperature (Tamb)
Ambient humidity in %RH, computed from HTU21D(F) sensor
Humidity cell temperature in °C, computed from HTU21D(F) sensor
Calculated Dew Point in °C
Constants: A=8.1332; B=1762.39; C=235.66
HPC199_3 HTU21D(F) Sensor Datasheet
www.meas-spec.com
16/21
October 2013
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