TECHNICAL DATA
RELATIVE HUMIDITY AND TEMPERATURE MODULE HTM1505
1
Based on the rugged HS1101 humidity sensor , HTM1505 is a dedicated humidity and temperature
transducer designed for OEM applications where a reliable and accurate measurement is needed.
Direct interface with a micro-controller is made possible with the module’s humidity linear voltage
and direct NTC outputs.HTM1505 is designed for an optimized board to board connection.
MAIN FEATURES
● Suitable for direct board assembly
● Not affected by repeated condensations
●Full interchangeability
● High reliability and long term stability
● Typical 1 to 4 Volt DC output for 0 to 100% RH at 5 V DC supply
● Humidity calibrated within +/- 2% RH @ 55% RH
● Temperature measurement through NTC 10 kohm +/- 3% direct output
● Ratiometric to voltage supply within the specified range
HUMIDITYSENSORSPECIFIC FEATURES
●Instantaneous de-saturation after long periods in saturation phase.
●Patented solid polymer structure.
●High resistance to chemicals.
●Fast response time.
MAXIMUM RATINGS
.
CHARACTERISTICS
(Ta = 23°C, Vs = 5Vdc, RL> 1MVotherwise stated)
Characteristics Symbol Min Typ Max Unit
Humidity measuring range RH 1 99 % RH
Relative Humidity accuracy (10 to 95% RH) RH +/-5 % RH
Voltage supply Vs 4.75 5.00 5.25 V
Nominal output @ RH = 55% Vout 2.42 2.48 2.54 V
Current consumption Ic0.4 0.8 mA
Temperature coefficient (10 to 50 °C ) Tcc + 0.1 % RH/°C
Averaged Sensitivity from 33% to 75% RH DmV/% RH +25 mV/% RH
Recovery time after 150 hours of condensation t 10 s
Humidity Hysteresis +/-1.5 % RH
Long term stability 0.5 %RH/yr
Response time (33 to 76% RH, static, @ 63%) t5s
Output impedance Z 70 V
Ratings Symbol Value Unit
Storage Temperature Tstg -40 to 85 °C
Supply Voltage (peak) Vs 7 Vdc
Humidity Operating Range RH 0 to 100 % RH
Temperature Operating Range Ta -30 to 85 °C
NTC Nominal output @ 25°C / Tolerance +/-3%
Sink current capability (RL515 kV)I
s300 mA
Ta 10 kohm
TECHNICAL DATA
2
MEASUREMENT CONDITIONS
● HTM1505 is specified for accurate mea-
surements within 10 to 95% RH.
●Excursion out of this range (< 10%
or > 95% RH, including condensation)
does not affect the reliability
of HTM1505 characteristics.
● Dedicated HTM15XX Product are avail-
able for extreme RH conditions (as
HTM1525 for low dewpoints) - Consult
HUMIREL for further information.
HTM1505 MODELLED LINEAR VOLTAGE OUTPUT (V S5 5V)
ERROR BUDGET AND COMPENSATIONS AT 23°C
1000
2000
3000
4000
0102030405060708090100
Relative Humidity (% RH)
Output Voltage (mV)
Vout 5 30.21 RH 1 814
from 10 to 95% RH
with V
out
in mV and RH in %
HTM 1505 Typical Measuring Ranges in Humidity
RH (%) Vout (mV)
10 1080
15 1250
20 1420
25 1580
30 1735
35 1890
40 2040
45 2190
50 2335
RH (%) Vout (mV)
55 2480
60 2625
65 2770
70 2920
75 3065
80 3220
85 3375
90 3530
95 3695
1000
2000
2500
1500
3000
3500
4000
0102030405060708090100
Relative Humidity
Output Voltage (mV)
METROLOGY
HTM1505 RANGE
26
25
22
21
0
1
24
23
2
3
4
5
6
01020 3040 5060708090100
Relative Humidity (%RH)
Delta in % RH
21
20,1
0
0,5
22
21,5
1
1,5
2
01020 3040 5060708090100
Relative Humidity (%RH)
Delta in % RH
Reversed Polynomial Equation
Vout = 9.23E-4RH3 -1.57E-1RH2 + 37.9RH + 715
HTM1505 ERROR LIMITS
LINEARITY ERROR OF HTM1505 MODULE
All equations Vout
in mV, RH in %, Ta in °C.
HPC033 Rev. D February 2003
Non linearity and temperature compensation:
RH% = -1.0388E-9V
out3 + 7.8530E-6Vout2 + 1.45251E-2Vout - 13.5
1+(Ta-23) * 2.4E-3
_______________
Temperature coefficient compensation:
RHCor% = RH%Read * (1 -(Ta -23)* 2.4E-3 )
REFERENCE OUTPUT VALUES
TECHNICAL DATA
3
Typical temperature output
CHARACTERISTICS
Depending on the needed temperature measurement range
and associated accuracy, we suggest two methods to access to
the NTC resistance values.
1
NTC resistance in Ωat temperature T in K
NTC resistance in Ωat rated temperature in K
Temperature in K
B value,material-specific constant of the NTC thermistor
Base of natural logarithm (e =2.71828)
HPC033 Rev. D February 2003
Characteristics Symbol Min. Typ. Max. Unit.
Nominal resistance @ 25°C 10 kΩ
Beta value : B25/100 B 3600 3730 3800
Temperature measuring range Ta - 30 80 °C
Nominal Resistance Tolerance Rn 2 3 %
B value tolerance B 3 %
Response Time τ10 s
-30 144790 16636
-29 136664 15444
-28 129054 14343
-27 121925 13325
-26 115243 12383
-25 109030 11516
-24 103115 10705
-23 97565 9953
-22 92354 9257
-21 87460 8612
-20 82923 8020
-19 78581 7463
-18 74497 6947
-17 70655 6468
-16 67039 6023
-15 63591 5606
-14 60381 5222
-13 57356 4865
-12 54503 4533
-11 51813 4225
-10 49204 3932
-9 46767 3662
-8 44467 3411
-7 42296 3177
-6 40247 2960
-5 38279 2756
-4 36455 2568
-3 34731 2393
Temperature Resistance Max.
°C (ohm) Deviation
-2 33100 2230
-1 31557 2078
0 30029 1932
1 28627 1799
2 27299 1675
3 26042 1560
4 24852 1452
5 23773 1355
6 22708 1261
7 21698 1174
8 20739 1093
9 19829 1017
10 18959 946
11 18128 879
12 17338 817
13 16588 759
14 15876 705
15 15207 654
16 14569 607
17 13962 563
18 13384 522
19 12834 484
20 12280 447
21 11777 413
22 11297 382
23 10840 353
24 10404 325
25 10000 300
The actual characteristic of an NTC thermistor can, however, only
be roughly described by the exponential relation,as the material
parame ter B in reality also depends on temperature. So this
approach is only suitable for describing a restricted range around
the rated temperature or resistance with sufficient accuracy.
2For 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 tabulated form. The below table
has been experimentally determined with utmost accuracy for
temperature increments of 1 degree.
26 9600 300
27 9218 300
28 8853 299
29 8506 297
30 8178 296
31 7866 294
32 7568 292
33 7283 290
34 7011 287
35 6734 284
36 6484 281
37 6244 278
38 6015 275
39 5796 271
40 5575 267
41 5373 264
42 5180 260
43 4995 257
44 4817 253
45 4636 248
46 4473 245
47 4316 241
48 4166 237
49 4021 233
50 3874 229
51 3737 225
52 3606 221
53 3481 217
54 3360 213
55 3237 208
56 3126 204
57 3019 200
58 2917 197
59 2819 193
60 2720 189
61 2629 185
62 2542 182
63 2458 178
64 2378 175
65 2304 171
66 2229 168
67 2158 165
68 2089 161
69 2022 158
70 1960 155
71 1898 152
72 1839 149
73 1782 146
74 1727 143
75 1673 140
76 1622 138
77 1573 135
78 1526 132
79 1480 130
80 1432 127
Temperature Resistance Max.
°C (ohm) Deviation
Temperature Resistance Max.
°C (ohm) Deviation
Temperature Resistance Max.
°C (ohm) Deviation
Temperature sensor (Ta = 25°C)
TECHNICAL DATA
4
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsability 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. Humirel reserves the right to make changes without further notice to any product herein. Humirel makes no warranty, representation or guarantee regard-
ing the suitability of its product for any particular purpose, nor does Humirel assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including with-
out limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “Typical” must be validated for each customer applications by cus-
tomerís technical experts. Humirel does not convey any license under its patent rights nor the rights of others. Humirel products are not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other application intended to support or sustain life, or for any application in which the failure of the Humirel product could create a situation where personal injury or death may occur.
Should buyer purchase or use Humirel products for any such unintended or unauthorized application, Buyer shall indemnify and hold Humirel and its officers, employees, subsidaries, affiliates and distributors harmless
against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of presonal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that Humirel was negligent regarding the design or manufacture of the part.Humirel is a registred trade mark of Humirel.
HPC033 Rev. D February 2003 email: sales@humirel.com
●RESISTANCE TO PHYSICAL AND CHEMICAL STRESSES.
● HTM1505 has passed through qualification processes of HUMIREL including vibration, shock, storage, high temperature
and humidity, ESD.
●Additional tests under harsh chemical conditions demonstrate good operation in presence of salt atmosphere, SO2
(O.5%), H2S (0.5%), O3, NOx, NO, CO, CO2, Softener, Soap, Toluene, acids (H2SO4, HNO3, HCl), HMDS, Insecticide,
Cigarette smoke, a non exhaustive list.
● HTM1505 is not light sensitive.
●SPECIFIC PRECAUTIONS
● HTM1505 is not protected against reversed polarity - Check carefully when connecting the device.
● If you wish to use HTM1505 in a chemical atmosphere not listed above, consult us.
TYPICAL PACKAGE
OUTLINE OF HTM1505
Dim Min (mm) Max (mm)
A 34 36
B 12.5 13.5
C 30.35 Typical
ORDERING INFORMATION (MULTIPLE PACKAGE QUANTITY OF 10 PIECES).
HTM 1505 HUMIDITY ANALOG VOLTAGE OUTPUT MODULE.
www.humirel.com
.
Dim Min (mm) Max (mm)
Pin out Assignement
1 NTC - Temperature
2 GROUND
3 Vcc - Voltage Supply
4 Vout - Humidity
D 5.08 Typical
E 13.1 Typical
