HTF3000LF – Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com July 2008
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• Small size product
• Compliant with RoHS recommendations
and most of Lead Free Soldering Process
• Humidity calibrated within +/-3% @55%RH at 5Vdc
• Stable, proportional frequency output from 0 to
100% RH
• High quality thermistor
DESCRIPTION
Based on the rugged HS1101LF humidity sensor, HTF3000LF is a dedicated humidity and temperature
transducer designed for OEM applications where a reliable and accurate measurement is needed. It features a
very small size for easy, cost-effective mechanical mounting. Direct interface with a micro-controller is made
possible with the module’s linear frequency output.
FEATURES
• One of the smallest humidity/temperature
modules on the market
• High reliability and long term stability
• Not affected by water immersion
• Stable characteristics with temperature
• Part could be washed with distilled water
Humidity Sensor Specific Features
• Instantaneous de-saturation after long periods in
saturation phase
• Fast response time
• High resistance to chemicals
• Patented solid polymer structure
Temperature Sensor Specific Features
• 10kΩ +/-1% NTC temperature sensor
• Stable
• High sensitivity
APPLICATIONS
• Printers
• HVAC controller
…
HTF3000LF - Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com April 2008
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PERFORMANCE SPECS
MAXIMUM RATINGS
Peak conditions: less than 10% of the operating time.
ELECTRICAL CHARACTERISTICS
(Ta=23°C, Vs=5Vdc +/-5%, RL>1MΩ unless otherwise stated)
Humidity Characteristi cs Symbol Min Typ Max Unit
Humidit
y
Measurin
g
Ran
g
e RH 0 100 %RH
Relative Humidity Accuracy (0 to 100% RH) RH Refer to Chart 2 on page 3 %RH
Su
pp
l
y
Volta
g
e Vs 35 8 Vdc
Nominal Out
p
ut
@
55%RH
(
at 5Vdc
)
Fout 6560 6600 6640 Hz
Current consum
p
tion
(
Max at 16Vdc
)
Ic 0.18 1 m
A
Su
pp
l
y
Volta
g
e Influence
(
3 to 7Vdc
)
RH +/-1 % RH
Avera
g
e Sensitivit
y
from 10% to 95%RH
Δ
Fout/ΔRH -10 -12 -14 Hz/%RH
Humidit
y
H
y
steresis +/-1 %RH
Lon
g
Term Stabilit
y
T+/-0.5 %RH/
y
r
Time Constant
(
at 63% of si
g
nal, static
)
40% to 95%RH, 2m/s
τ
10 s
(Ta=25°C)
Temperature Characteristics Symbol Min Typ Max Unit
Nominal Resistance
@
25°C R10 kΩ
Beta value: B25/100
β
3346 3380 3413
Tem
p
erature Measurin
g
Ran
g
eTa -40 85 °C
Nominal Resistance Tolerance
@
25°C RN1 %
Beta Value Tolerance
β
1 %
Res
p
onse Time
τ
10 s
Ratings Symbol Value Unit
Storage Temperature Tst
g
-40 to 105 °C
Storage Humidity RHst
g
0 to 100 % RH
Supply Voltage (Peak) Vs 16 Vdc
Humidity Operating Range RH 0 to 100 % RH
Temperature Operating Range Ta -40 to 85 °C
Tem
p
erature in °C
O
p
eratin
g
Ran
g
e
HTF3000LF - Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com April 2008
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TYPICAL PERFORMANCE CURVES
HUMIDITY SENSOR
• Relative Humidity Accuracy of HTF3000LF @23°C
• Modeled Signal Output Equation
Fout = 7314 – 16.79*RH + 0.0886*RH² – 0.000358*RH3
Fout in Hz and RH in %
• Modeled Reversed Output Equation
RH = 89.8*10-10*Fout3 – 15.7486*10-5*Fout ² + 0.80945*Fout – 1009
Fout in Hz and RH in %
• Typical response look-up table
RH (%) 1 5 10 15 20 25 30 35 40 45 50
Fout (Hz) 7295 7230 7155 7080 7010 6945 6880 6820 6760 6705 6650
RH (%) 55 60 65 70 75 80 85 90 95 99
Fout (Hz) 6600 6550 6500 6450 6400 6355 6305 6260 6210 6170
Output Voltage wave form
HTF3000LF - Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com April 2008
4/7
• Temperature influence on HTF3000LF humidity measurement
Calibration data are traceable to NIST standards through CETIAT laboratory.
For demanding application, temperature coefficient could be compensated over operating temperature range
using following formula:
RHcorr = RH + 0.08 * ( T – 25 )
Fout Corr = Fout – 0.88 * ( T – 25 )
T in °C, RH in %, Fout in Hz
TEMPERATURE SENSOR
• Typical temperature output
Depending on the needed temperature measurement range and associated accuracy, we suggest two methods
to access to the NTC resistance values.
)
11
(N
TT
NT eRR −
∗=
β
RT NTC resistance in Ω at temperature T in K
RN NTC resistance in Ω at rated temperature T in K
T, TN Temperature in K
β Beta value, material specific constant of NTC
e Base of natural logarithm (e=2.71828)
c The exponential relation only roughly describes the actual characteristic of an NTC thermistor can, however,
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.
d 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 HPC106-0 “Low power NTC measurement”.
HTF3000LF - Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com April 2008
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Temperature Look-up Table
Temp Resistance Max Deviation Temp Resistance Max Deviation Temp Resistance Max Deviation Temp Resistance Max Deviation
(°C) (Ω)(Ω)(°C
)
(Ω)(Ω)(°C)(Ω)(Ω
)
(°C
)
(Ω)(Ω)
-40 195652 7921 224988 482 44 5086 86 86 1413 42
-39 184917 7378 323951 452 45 4917 85 87 1375 42
-38 174845 6874 422963 423 46 4754 83 88 1338 41
-37 165391 6407 522021 396 47 4597 82 89 1303 40
-36 156513 5974 621123 371 48 4446 81 90 1268 39
-35 148171 5571 720267 348 49 4301 80 91 1234 39
-34 140330 5197 819450 326 50 4161 79 92 1202 38
-33 132958 4849 918670 305 51 4026 77 93 1170 37
-32 126022 4527 10 17926 285 52 3896 76 94 1139 37
-31 119494 4226 11 17214 267 53 3771 75 95 1110 36
-30 113347 3947 12 16534 250 54 3651 74 96 1081 35
-29 107565 3687 13 15886 233 55 3535 73 97 1053 35
-28 102116 3446 14 15266 218 56 3423 72 98 1026 34
-27 96978 3221 15 14674 204 57 3315 70 99 999 34
-26 92132 3011 16 14108 190 58 3211 69 100 974 33
-25 87559 2815 17 13566 178 59 3111 68 101 949 32
-24 83242 2633 18 13049 166 60 3014 67 102 925 32
-23 79166 2463 19 12554 154 61 2922 66 103 902 31
-22 75316 2305 20 12081 144 62 2834 65 104 880 31
-21 71677 2157 21 11628 134 63 2748 64 105 858 30
-20 68237 2019 22 11195 125 64 2666 63 106 837 30
-19 64991 1890 23 10780 116 65 2586 62 107 816 29
-18 61919 1770 24 10382 108 66 2509 60 108 796 29
-17 59011 1658 25 10000 100 67 2435 59 109 777 28
-16 56258 1553 26 9634 100 68 2364 58 110 758 28
-15 53650 1454 27 9284 100 69 2294 57 111 740 27
-14 51178 1363 28 8947 100 70 2228 56 112 722 27
-13 48835 1277 29 8624 99 71 2163 55 113 705 26
-12 46613 1197 30 8315 99 72 2100 54 114 688 26
-11 44506 1121 31 8018 98 73 2040 53 115 672 25
-10 42506 1051 32 7734 98 74 1981 52 116 656 25
-9 40600 985 33 7461 97 75 1925 52 117 640 24
-8 38791 923 34 7199 96 76 1870 51 118 625 24
-7 37073 865 35 6948 95 77 1817 50 119 611 23
-6 35442 810 36 6707 94 78 1766 49 120 596 23
-5 33892 759 37 6475 93 79 1716 48 121 583 23
-4 32420 712 38 6253 92 80 1669 47 122 569 22
-3 31020 667 39 6039 91 81 1622 46 123 556 22
-2 29689 625 40 5834 90 82 1578 46 124 544 22
-1 28423 586 41 5636 89 83 1535 45 125 531 21
027219 549 42 5445 88 84 1493 44
126076 514 43 5262 87 85 1452 43
HTF3000LF - Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com April 2008
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QUALIFICATION PROCESS
RESISTANCE TO PHYSICAL AND CHEMICAL STRESSES
• HTF3000LF has passed through qualification processes of MEAS-France including vibration, shock,
storage, high temperature and humidity.
• Additional tests under harsh chemical conditions demonstrate good operation in presence of salt
atmosphere, SO2 (0.5%), H2S (0.5%), 03, NOx, NO, CO, CO2, Softener, Soap, Toluene, acids (H2SO4,
HNO3, HCI), HMDS, Insecticide, Cigarette smoke, this is not an exhaustive list.
• ESD: HTF3000LF is able to sustain a minimum of +/-8kV (contact discharge).
PACKAGE OUTLINE
HTF3000LF PVH
RECOMMENDED THROUGH HOLE FOOTPRINT
Dim A B C D E F K
Min 17.9 12.0 10.7 14.25 4.80 1.76 0.54
Max 18.9 13.0 11.7 14.95 5.40 3.76 0.74
Dimensions in millimeters
HTF3000LF - Temperature and Relative Humidity Module
HTF3000LF HPC077 Rev I www.meas-spec.com April 2008
7/7
SOLDERING INF O RMAT ION
HTF3000LF PVH: Hand soldering or wave soldering
ORDERING INFORMATION
HPP808H031 FOR HTF3000LF PVH
STORAGE: TUBE M.Q.P OF 48 PARTS; BOX M.Q.P OF 1008 PARTS (21 TUBES)
Customer Service contact details
Measurement Specialties, Inc.
105 av. du Général Eisenhower
BP 23705 31037 TOULOUSE CEDEX 1
FRANCE
Tél: +33 (0) 561 194 848
Fax:+33 (0) 561 194 553
Sales: humidity.sales@meas-spec.com
Revision Comments Who Date
E Mechanical dimension tolerances updated, Typical
voltage supply changed into 5V (instead of 3.3V) D. LE GALL August 07
F HTF3000LF RL reference added, product storage
quantities added D. LE GALL November 07
G Mechanical dimension tolerance updated D. BEZ December 07
H Soldering information paragraph updated, chart2
improved (poor image), HTF3000LF SMD and
HTF3000LF RL references removed
D. LE GALL January 08
I Standardized datasheet format D. LE GALL April 08
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for
inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the
manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein. Measurement
Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does
Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims
any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different
applications. All operating parameters must be validated for each customer application by customer’s technical experts. Measurement
Specialties, Inc. does not convey any license under its patent rights nor the rights of others.
