TECHNICAL

DATA

3

Typical temperature output

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)

Humirel Sensor Device Data / HPC050VB Dec 2005

Characteristics

Symbol

Min.

Typ.

Max.

Unit.

Nominal resistance @ 25°C

10

Beta value : B25/100

B

3600

3730

3800

Temperature measuring range

Ta

- 40

85

°C

Nominal Resistance Tolerance at 25°C

Rn

2

3

%

B value tolerance

B

3

%

Response Time

τ

10

s

-40

262960 35403

-38

232539 30358

-36

206064 26075

-34

182852 22416

-32

162498 19290

-30

144790 16636

-28

129054 14343

-26

115243

12383

-24

103115

10705

-22

92354

9257

-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.

2 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 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

77

1573

135

79

1480

130

81

1390

124

83

1310

119

85

1235

115

Temperature

Resistance

Max.

°C

(ohm)

Deviation

Temperature

Resistance

Max.

°C

(ohm)

Deviation

Temperature

Resistance

Max.

°C

(ohm)

Deviation