HTM2500LF Measurement Specialties Inc/MEAS France, HTM2500LF Datasheet - Page 5

• Manufacturer Part Number: HTM2500LF
• Description: SENSOR RH CAP NTC THERM VOUT
• Manufacturer: Measurement Specialties Inc/MEAS France

Specifications of HTM2500LF

• Output Type: Analog Voltage
• Sensor Type: Humidity and Temperature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: HTM2500; HTM2500

HTM2500 – Temperature and Relative Humidity Module
•
TEMPERATURE SENSOR
•
Depending on the needed temperature measurement range and associated accuracy, we suggest two methods
to access to the NTC resistance values.
as the material parameter
restricted range around the rated temperature or resistance with sufficient accuracy.
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/Humirel Application Note HPC106 “Low power NTC measurement”.
•
HTM2500 HPC032 Rev C
The exponential relation only roughly describes the actual characteristic of an NTC thermistor can, however,
For practical applications, a more precise description of the real R/T curve may be required. Either more
Humidity Measurement using HTM2500
Typical temperature output
Temperature look-up table
Temp (° C)
in reality also depend on temperature. So this approach is suitable for describing a
-30
-25
-20
-15
-10
10
15
-5
0
5
R
R
T, T
e
T
N
N
NTC resistance in
NTC resistance in
Temperature in K
Beta value, material specific constant of NTC
Base of natural logarithm (e=2.71828)
169149
125546
94143
71172
54308
41505
32014
25011
19691
15618
R ( )
R
T
www.meas-spec.com
=
R
N
5/7
×
Temp (° C)
e
β
20
25
30
35
40
45
50
55
60
65
T
1
at temperature T in K
at rated temperature T in K
−
T
1
N
12474
10000
R ( )
8080
6569
5372
4424
3661
3039
2536
2128
April 2008