Campbell-scientific HMP35C Temperature and RH Sensor Instrukcja Użytkownika Pobierz pdf (Strona 10)

HMP35C TEMPERATURE AND RH PROBE

TABLE 8. Wiring for Example 3

Description Color CR10(X)

Temperature Orange SE 3 (2H)

Relative Humidity Green SE 4 (2L)

Temperature Signal Reference White AG

Temperature Excitation Black E1

Power Control Yellow C1

Power Red 12 V

RH Signal, Power, & Control Reference Purple AG

Shield Clear G

Example 3. CR10(X) Program that Measures the HMP35C

in an Electrically Noisy Environment

;Measure the HMP35C thermistor.

;

01: AC Half Bridge (P5)

1: 1 Reps

2: 22 7.5 mV 60 Hz Rejection Range

;CR500 (7.5 mV); CR23X (10 mV)

;21X, CR7 (15 mV)

3: 3 SE Channel

;Orange wire (SE 3), White wire (AG)

4: 1 Excite all reps w/Ex 1

;Black wire (EX 1)

5: 2000 mV Excitation

;CR500, CR23X (2000 mV); 21X, CR7 (4000 mV)

6: 1 Loc [ T_C ]

7: 800 Mult

8: 0 Offset

;Compute the temperature in degrees Celsius.

;

02: Polynomial (P55)

1: 1 Reps

2: 1 X Loc [ T_C ]

3: 1 F(X) Loc [ T_C ]

4: -53.46 C0

5: 90.807 C1

6: -83.257 C2

7: 52.283 C3

8: -16.723 C4

9: 2.211 C5

;Apply the temperature multiplier.

;

03: Z=X*F (P37)

1: 1 X Loc [ T_C ]

2: 1 F

;See Table 4 for alternate multipliers

3: 1 Z Loc [ T_C ]

;Apply the temperature offset.

;

04: Z=X+F (P34)

1: 1 X Loc [ T_C ]

2: 0 F

;See Table 4 for alternate offsets

3: 1 Z Loc [ T_C ]

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Campbell-scientific HMP35C Temperature and RH Sensor Instrukcja Użytkownika Strona 10

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