HUMIREL HPC077VC

HTF3000LF

July 2006

2

Relative Humidity Accuracy of HTF 3000LF @ 23°C

-8

-6

-4

-2

0

2

4

6

8

0

1020

3040

5060

7080

90

100

r e l a t i v e hum idit y i n %

Chart 2

Modeled Signal output:

Fout = 7314 – 16.79*RH + 0.0886*RH²-0.000358* RH

3

(Fout in Hz and RH in %)

Modeled Reversed Equation:

RH = 89,8*10-

0,80945*Fout -1009

(Fout in Hz and RH in %)

Typical response look-up table at 3.3V (Polynomial Reference curve)

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

Temperature influence on HTF3000LF humidity measurement

For demanding application, temperature coefficient could be compensated over operating temperature

range using following formula :

(T in °C, RH in %RH, Fout in Hz

)