HTF3000LFPVH Measurement Specialties Inc/MEAS France, HTF3000LFPVH Datasheet - Page 4

• Manufacturer Part Number: HTF3000LFPVH
• Description: MODULE RH TEMP FREQ OUT MINI
• Manufacturer: Measurement Specialties Inc/MEAS France

Specifications of HTF3000LFPVH

• Output Type: Frequency, NTC Thermistor
• Sensor Type: Humidity and Temperature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

HTF3000LF - Temperature and Relative Humidity Module
•
For demanding application, temperature coefficient could be compensated over operating temperature range
using following formula:
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 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.
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 HPC106-0 “Low power NTC measurement”.
HTF3000LF HPC077 Rev I
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
Temperature influence on HTF3000LF humidity measurement
Typical temperature output
Calibration data are traceable to NIST standards through CETIAT laboratory.
RH
Fout
T in °C, RH in %, Fout in Hz
corr
Corr
= RH + 0.08 * ( T – 25 )
= Fout – 0.88 * ( T – 25 )
R
R
T, T
β
e
T
N
N
NTC resistance in Ω at temperature T in K
Temperature in K
Beta value, material specific constant of NTC
NTC resistance in Ω at rated temperature T in K
Base of natural logarithm (e=2.71828)
R
T
www.meas-spec.com
=
R
N
4/7
∗
e
β
(
T
1
−
T
1
N
)
April 2008