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参数资料
| 型号： | HTM2500LF |
| 厂商： | Measurement Specialties Inc/MEAS France |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | SENSOR RH CAP NTC THERM VOUT |
| 产品目录绘图： | HTM2500 Side |
| 标准包装： | 20 |
| 传感器类型： | 湿度和温度 |
| 输出类型： | 模拟电压 |
| 产品目录页面： | 2819 (CN2011-ZH PDF) |
| 其它名称： | HTM2500 HTM2500-ND |
HTM2500LF – Temperature and Relative Humidity Module
HTM2500LF TEMPERATURE SENSOR: DIRECT NTC OUTPUT
?
Typical temperature output
Depending on the needed temperature measurement range and associated accuracy, we suggest two methods
β ? ? ?
? ?
to access to the NTC resistance values.
R T
R N
R T = R N × e
NTC resistance in
NTC resistance in
? 1 1 ?
? T T N ?
at temperature T in K
at rated temperature T in K
T, T N
β
e
Temperature in K
Beta value, material specific constant of NTC
Base of natural logarithm (e=2.71828)
The exponential relation only roughly describes the actual characteristic of an NTC thermistor can, however,
the material parameter β in reality also depend on temperature. So this approach is suitable for describing a
restricted range around the rated temperature or resistance with sufficient accuracy.
For practical applications, a more precise description of the real R/T curve may be required. Either more
complicated approaches (e.g. the Steinhart-Hart equation) are used or the resistance/temperature relation as
given in tabulation form. The below table has been experimentally determined with utmost accuracy for
temperature increments of 1 degree.
Actual values may also be influenced by inherent self-heating properties of NTCs. Please refer to MEAS-France
Application Note HPC106 “Low power NTC measurement”.
?
Temperature look-up table
Temp (°C)
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
R( )
195652
148171
113347
87559
68237
53650
42506
33892
27219
22021
17926
14674
12081
Temp (°C)
25
30
35
40
45
50
55
60
65
70
75
80
85
R( )
10000
8315
6948
5834
4917
4161
3535
3014
2586
2228
1925
1669
1452
HTM2500LF HPC169 Rev C
www.meas-spec.com
5/9
October 2012
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