Owner's manual

SR50A Sonic Ranging Sensor

'Measure the 107 temperature sensor:

Therm107 (Air_Temp,1,1,Vx1,0,250,1.0,0)

'Use Air_Temp to calculate corrected distance:

Temp_Corr_Distance=Raw_Distance*(SQR((Air_Temp+273.15)/273.15))

'Subtract the corrected distance from the initial distance of the SR50A to the ground:

Snow_Depth=Initial_Distance - Temp_Corr_Distance

'Call Data Table and Store Data:

CallTable (Table1)

NextScan

EndProg

10.1.3 CR10X Example (SDI-12 “M1!”)

;{CR10X}

;

;In this example, the SR50A is mounted 2.5 meters above the ground.

;The CR10X sends an SDI-12 command to the SR50A, which outputs a

;non-temperature compensated distance value (Raw_Dist) and signal quality value.

;Two input locations are used to store incoming data.

*Table 1 Program

01: 60 Execution Interval (seconds)

;Measure the 107 temperature probe:

1: Temp (107) (P11)

1: 1 Reps

2: 1 SE Channel ;SE channel 1 used for this example

3: 1 Excite all reps w/E1 ;Excite channel 1 used for this example

4: 1 Loc [ T_Kelvin ]

5: 1.0 Multiplier

6: 273.15 Offset ;This converts the value to degrees Kelvin

;Use SDI-12 command "M1!" to receive Distance and Signal Quality from the SR50A

2: SDI-12 Recorder (P105)

1: 0 SDI-12 Address

2: 1 Start Measurement (aM1!)

3: 1 Port ;Use Ports 5-8 for CR23X

4: 3 Loc [ Raw_Dist ]

5: 1.0 Multiplier

6: 0.0 Offset

;Apply air temperature compensation to distance:

3: Z=F x 10^n (P30)

1: 273.15 F

2: 0 n, Exponent of 10

3: 5 Z Loc [ Ref_Temp ]

4: Z=X/Y (P38)

1: 9 X Loc [ T_Kelvin ]

2: 5 Y Loc [ Ref_Temp ]

3: 6 Z Loc [ Mult1 ]