Campbell-scientific HMP35C Temperature and RH Sensor Manuel d'utilisateur télécharger pdf (Page 8)

HMP35C TEMPERATURE AND RH PROBE

Example 2. Sample CR10(X) Program measuring HMP35C Temperature

using DC Half Bridge with Delay

;Measure the HMP35C thermistor.

;

01: Excite-Delay (SE) (P4)

1: 1 Reps

2: 2 7.5 mV Slow 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: 2 Delay (units 0.01 sec)

6: 2000 mV Excitation

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

7: 1 Loc [ T_C ]

8: 0.4 Mult

;CR500, CR23X (0.4); 21X, CR7 (0.2)

9: 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 ]

;Turn the HMP35C on.

;

05: Do (P86)

1: 41 Set Port 1 High

;Yellow wire (C1)

;Pause 150 milliseconds, before making the measurement, so the

;probe can stabilize on the true relative humidity.

;

06: Excitation with Delay (P22)

1: 1 Ex Channel

2: 0 Delay W/Ex (units = 0.01 sec)

3: 15 Delay After Ex (units = 0.01 sec)

4: 0 mV Excitation

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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Campbell-scientific HMP35C Temperature and RH Sensor Manuel d'utilisateur Page 8

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