Campbell-scientific SR50-L CSC Ultrasonic Distance Sensor Manual do Utilizador descarregar pdf (Página 19)

SR50 Sonic Ranging Sensor

The following instructions set the sensor enable line high long enough for the

SR50 to detect it, then set it low.

1: Set Port (P20)

1: 1 Set High

2: 1 Port Number

2: Excitation with Delay (P22)

1: 1 Ex Chan

2: 1 Delay w/Ex (units = 0.01 sec)

3: 0000 Delay After Ex (units = 0.01 sec)

4: 0.0 mV Excitation

3: Set Port (P20)

1: 0 Set Low

2: 1 Port Number

The P3 instruction counts the pulse train being transmitted from the SR50.

Distance-to-surface will automatically be reset to 0.00 after the distance is

calculated and stored for later processing and output.

4: Pulse (P3)

1: 1 Reps

2: 1 Pulse Input Chan

3: 00 Config Option

4: 21 Loc [ Dis2Surf ]

5: -.0025 Mult

6: 0.0 Offset

Measure air temperature and convert to degrees Kelvin. This example assumes

air temperature is being measured with Campbell Scientific’s Model 107

probe.

5: Temp 107 Probe (P11)

1: 1 Reps

2: 1 In Chan

3: 1 Excite all reps w/Exchan 1

4: 22 Loc [ T_Kelvin ]

5: 1 Mult

6: 273.15 Offset

Compute the air temperature compensation factor and correct the distance-to-

surface for air temperature (see formula 1).

6: Z=F (P30)

1: 273.15 F

2: 23 Z Loc [ 273_15 ]

7: Z=X/Y (P38)

1: 22 X Loc [ T_Kelvin ]

2: 23 Y Loc [ 273_15 ]

3: 24 Z Loc [ ATempComp ]

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 37 38

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