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參數(shù)資料
| 型號(hào)： | DS1923-F5 |
| 英文描述： | Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory |
| 中文描述： | Hygrochron溫度/濕度記錄儀與8KB數(shù)據(jù)記錄存儲(chǔ)器iButton的 |
| 文件頁數(shù)： | 51/52頁 |
| 文件大?。?/td> | 495K |
| 代理商： | DS1923-F5 |
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DS1923: Hygrochron Temperature/Humidity Logger iButton with 8kB Data Log Memory
RH TEMPERATURE COMPENSATION
The data for the software correction of humidity is taken at 25°C. Since the temperature characteristics of the
humidity sensor are known, humidity readings taken at other temperatures can be corrected, provided the
temperature at the time of the humidity conversion is also known. Therefore, to obtain the most accurate humidity
results, both temperature and humidity should be logged.
Temperature compensation uses the following equation:
HTcorr = (Hcorr * K + *(T-25°C) - *(T-25°C)2)/(K + *(T-25°C)- *(T-25°C)2)
Hcorr is the humidity reading with the software correction algorithm for humidity already applied, as explained in
the previous section. The function and values of the other parameters are explained in the table below.
Name
Function
T
Temperature at the time of humidity conversion
K
Humidity sensor conversion constant
Linear compensation, enumerator
Quadratic compensation, enumerator
51 of 52
Value
(in °C)
0.0307
0.0035/°C
0.000043/°C2
>15°C: 0.00001/°C
15°C: -0.00005/°C
0.000002/°C2
Linear compensation, denominator
Quadratic compensation, denominator
Numerical Temperature Compensation Example
Sample Input Data
Application of Correction Coefficients to Sample Reading
= 0.00001/°C
HTcorr = (24.445 * 0.0307 + 0.0035 * 45 - 0.000043 * 452)/ (0.0307
+ 0.00001 * 45 - 0.000002 * 452)
HTcorr = 30.291 %
T = 70°C
Hcorr = 24.445%RH
SOFTWARE SATURATION DRIFT COMPENSATION
Capacitive humidity sensors read higher humidity values than the actual humidity level when they are exposed to a
high-humidity environment for an extended time period. The DS1923’s humidity sensor produces readings that are
higher than the actual humidity when exposed to humidity levels of about 70%RH and higher. This shift continues
to increase while the device remains at 70%RH and above. This effect is called saturation drift, or sometimes
referred to as hyteresis. This drift is reversible. Readings return to their regular level when the DS1923 is removed
from a high-humidity environment.
It is possible to compensate for most of the error introduced by the saturation drift by post-processing temperature
and humidity logs using the equation below, which is based on laboratory tests and curve-fitting techniques.
N
0.0156 * ARH
k
* 2.54
HScorr = HTcorr -
k = 1
-0.3502*k
1 + (T
k
- 25) / 100
ARH
k
The average software corrected and temperature compensated humidity reading of the k
th
hour that the
device is continuously exposed to 70%RH or higher.
The average software corrected temperature reading of the k
th
hour that the device is continuously
exposed to 70%RH or higher.
The number of hours that the device is continuously exposed to 70%RH or higher.
HTcorr The humidity reading
at the end
of the N
hour with the software correction algorithm for humidity and
temperature compensation already applied. See previous sections for details.
The numbers in the equation are derived from curve fitting. They apply to a time scale in hours.
T
k
N
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| DS1923-F5# | 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1923-F5#W | 功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1923-F5+ | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS19310 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Color TV Owners Manual Manuel dinstructions du teleouleur Color TV Manual Del Propietario |
| DS193-K | 制造商:Miyama Electric 功能描述: |
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