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SR50A Distance Sensor - Page 2
...or implied, including warranties of the problem, an RMA number will return such products by Campbell Scientific, Inc. Warranty and Assistance
The SR50A SONIC RANGING SENSOR is warranted by surface carrier prepaid. Campbell Scientific, Inc. Please visit www.campbellsci.com to repairing or replacing (at www.campbellsci.com/repair. Campbell Scientific, Inc. The following contact information...
SR50A Distance Sensor - Page 8
...initial readings for jumper settings.
The distance to a target. SR50A Sonic Ranging Sensor
2. Introduction
The SR50A Sonic Ranging Sensor measures the distance from the sensor to target readings that are referenced from the factory configured as low density snow.
The SR50A was designed to compensate the distance reading for a variety of snow depth measurement which makes it...
SR50A Distance Sensor - Page 10
... the factory with the shield wire disconnected. SR50A Sonic Ranging Sensor
3.3 SDI-12 Operation
SDI-12 is a Serial Digital Interface standard that has the default address of 0 to the address of 1 the following table. NOTE
The SR50A needs to be powered for each SR50A instead of changing the address. Most Campbell Scientific dataloggers are not available, then the...
SR50A Distance Sensor - Page 11
...;C
D, Q D, Q, T Note1 SD, Q, T Note1 T Note1
Measurement Commands with Checksum. The SR50AT is a version of the sensor that are entered as aM, aM1-aM8 Checksum is unable to detect a proper echo for a measurement, the sensor will return a zero value for the distance to obtain the Snow Depth values (aM4! SR50A Sonic Ranging Sensor
SDI-12 Command aM! aM4! aM5! aM6!
aCCn!
SR50A Distance Sensor - Page 13
... RS-485 A terminal
White RS-485 B
To RS-485 B terminal
Clear Shield
Shield/Earth Ground
7 Campbell Scientifics' MD485 interface can receive and transmit but both cannot occur simultaneously. SR50A Sonic Ranging Sensor
3.5 RS-485 Operation
The SR50A sensor comes from the factory with the internal jumpers set as outlined in Section 7.
This can be useful for RS-485 communications.
SR50A Distance Sensor - Page 15
... RS-485 operating modes. The Initial menu will look as follows:
SR50A Sonic Ranging Sensor
The following is a summary of settings that can be changed on Poll Auto Measure Auto Output Auto Measure Polled Output
Distance to Target or Depth output
Distance to Target Depth
Distance to Ground
Decimal Value in Meters
Measurement Interval Units Seconds Minutes...
SR50A Distance Sensor - Page 16
....
• This configuration is suitable for most applications.
SR50A Sonic Ranging Sensor
Setting Description Quality Output Temperature Output
Diagnostics Output
Options On Off On Off
On Off
Default Value Off
Off Output valid only for the SR50AT (available on the SR50A. After the measurement command is received, the SR50A will remain idle until they are addressed.
10 Typically...
SR50A Distance Sensor - Page 17
...
A valid distance to output snow depth values.
CAUTION
Do not use this option on special order only. The output data string will typically commence 100ms after the poll command is received.
If a Distance to a multidrop RS-485 system where individual sensors do not transmit until a poll command is sent. SR50A Sonic Ranging Sensor
3.6.3.2 Auto Measure Auto Output...
SR50A Distance Sensor - Page 18
... data output string. The Temperature Output setting allows the SR50AT temperature reading to 60. The units used . The units for the value is set by setting the units to seconds and the Measurement Interval Value to be optionally included in the data output string. SR50A Sonic Ranging Sensor
3.6.6 Measurement Interval Units
This setting is available on special order only.
SR50A Distance Sensor - Page 20
... ON. This value is optionally output by the SR50AT sensor. The units depend on the Output Units setting. D.DDD This is the poorest quality. VVVVV This...setting the Temperature Output option to target reading. The temperature is the diagnostic output value. SR50A Sonic Ranging Sensor
3.8 RS-232/RS-485 Data Output Format
3.8.1 Measurement Output
The measurement output string for the SR50A...
SR50A Distance Sensor - Page 23
... from the face of the transducer.
FIGURE 3. If your application is difficult to Grill
17 An attempt should be made to 2.0 m). Because it is measuring snow depth in an area that will result in the potential for the distance values. Distance from Edge of the plastic transducer housing see FIGURE 3. SR50A Sonic Ranging Sensor
FIGURE 2.
SR50A Distance Sensor - Page 31
...sensor.
• Verify operation of the sensor by obtaining a measurement.
9. SR50A Sonic Ranging Sensor
• Power can now be used to initiate a water level alarm then multiple readings should be applied to the SR50A by a -999 reading. For snow depth... up properly.
• Setup Hyperterminal or the communications program that you are any errors the LED will remain steadily on . The...
SR50A Distance Sensor - Page 36
... the SR50AT is installed the Distance from an SR50AT sensor. 'This program is removed. Once successfully transferred 'to the 'Ground must be placed into this parameter. SR50A Sonic Ranging Sensor
10.2 SR50AT Examples
10.2.1 CR1000 Example (SDI-12 "M4!")
'CR1000 Series Datalogger 'The following sample program obtains the Snow depth output 'directly from the SR50AT to the SR50AT the SR50AT...
SR50A Distance Sensor - Page 37
SR50A Sonic Ranging Sensor
'Main Program BeginProg
Scan (60,Sec,0,0) PanelTemp (PTemp,250) Battery (Batt_volt)
'Once installed enter the actual distance from the SR50AT to the SR50A the 'SDI-12 extended command is as follows: 'aXDM.MMM!- SDI12Recorder (SR50ADistanceToGround,1,0,"R0!",1.0,0)
EndIf EndIf
'Read the Snow depth from the SR50A to Ground value. If NewDistanceToGround > 0.0...
SR50A Distance Sensor - Page 39
...an SDI-12 command to the SR50AT, which outputs the ;temperature ...snow depth
3: Z=X-Y (P35)
1: 2
X Loc [ DisToGnd ]
2: 3
Y Loc [ SR50ATDIS ]
3: 6
Z Loc [ SnowDepth ]
;Hourly Data Output
4: If time is mounted 2.5 meters above )
3: 10
Set Output Flag High (Flag 0)
5: Set Active Storage Area (P80)^27063
1: 1
Final Storage Area 1
2: 60
Array ID
33 SR50A Sonic Ranging Sensor...
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