Characteristics

Symbol

Min.

Typ.

Max.

Unit.

Temperature coefficient at 55 % RH / 10 to 40°C

Tcc+ 0.04

pF/°C

Humidity Hysteresis

+/-1.5

% RH

Deviation to typical curve (see below) (10 % to 90 % RH)

+/-2

% RH

Supply voltage

Vs

1

5

10

Vac

Leakage current (Vs = 5 volts)

1nA

Characteristics

Symbol

Min.

Typ.

Max.

Unit.

Nominal resistance @ 25°C

10

k

Ω

Beta value : B25/100

B3600

3730

3800

Temperature measuring range

Ta

- 40

100

°C

Nominal Resistance Tolerance*

Rn

2

3

%

B value tolerance

B3

%

Response Time

τ

10

s

Humidity sensor

Temperature sensor

Typical response curve of HTS2010SMD in humidity

Typical temperature output

TECHNICAL DATA

2

Humirel Sensor Device Data / HPC008 Rev E September 2002

205

200

195

190

185

180

175

170

165

160

010

20

30

4050

6070

8090

100

Relative Humidity (% RH)

Calibration data are traceable to NIST

standards through CETIAT laboratory.

Measurement frequency : 10 kHz

Ta = 25°C

Depending on the needed temperature measurement range and the

associated accuracy, we suggest two methods to access to the NTC

resistance values.

NTC resistance in

Ω at temperature T in K

C in pF, RH in %

Polynomial response :

NTC resistance in

Ω at rated temperature in K

Temperature in K

B value, material-specific constant of the NTC thermistor

Base of natural logarithm (e = 2,71828)

°C

ohm

ohm

°C

R NTC standardized

R NTC exponential

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

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.

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 rela-

tion as given in tabulated from. These standardized curves have been

experimentally determined with utmost accuracy ; they are aslo availa-

ble for temperature increments of 1 degree.

262960

194110

144790

109030

82923

63591

49204

38279

30029

23773

18959

15207

12280

10000

8178

6734

5575

4636

3874

3237

2720

2304

1960

1674

1432

1235

1067

927

809

°C

ohm

ohm

°C

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

85

90

95

100

52000

40500

31000

24500

19300

15400

12350

10000

8140

6670

5500

4550

3800

3180

2690

2270

1940

1650

1430

1230

1070

925

810

x

1

2

*Tighter tolerance available on request

*Tighter tolerance available on request

(Ta = 25°C, measurement frequency @ 10 kHz unless otherwise noted)