Campbell SR50AT Instruction Manual
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Campbell SR50AT Instruction Manual

Sonic ranging sensors
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SR50AT, SR50AT-316SS,
and SR50ATH
Sonic Ranging Sensors
10/16
C o p y r i g h t
©
2 0 0 7 - 2 0 1 6
C a m p b e l l
S c i e n t i f i c ,
I n c .

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  • Page 1 SR50AT, SR50AT-316SS, and SR50ATH Sonic Ranging Sensors 10/16 C o p y r i g h t © 2 0 0 7 - 2 0 1 6 C a m p b e l l S c i e n t i f i c ,...
  • Page 3 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...
  • Page 5 PLEASE READ FIRST About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in...
  • Page 7 • Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS...

  • Page 9: Table Of Contents

    Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ..............1 2. Precautions ..............1 3. Initial Inspection ............1 4.
  • Page 10 Configure Tera Term for Serial 9600 BPS Communication .... E-1 Firmware Update ................E-5 E.2.1 Configure Tera Term to Send SR50AT/T Firmware Update ..E-5 E.2.2 Sending New Firmware to a SR50AT/T Sensor ....... E-6 F. SR50ATH Heater Operation ........F-1 Heater Specifications ................
  • Page 11 Beam Angle Clearance ................. 7 7-2. Distance from Edge of Transducer Housing to Grill ......8 7-3. Two Views of the SR50AT Mounted to a Crossarm via the #19517 Mounting Kit ..................8 7-4. SR50AT-316SS Mounted to a Crossarm via the #19517 Mounting Kit with the Temperature Sensor Housed in a RAD06 Radiation Shield ....................
  • Page 12 Table of Contents CRBasic Examples B-1. CR1000 SDI-12 Program ..............B-1 B-2. CR6 SDI-12 Program ..............B-3 B-3. CR1000 RS-232 Program ..............B-5 B-4. CR1000 Programming Example Using an MD485 and SC110 9-pin Male Connector ..............B-9 B-5. CR6 RS-485 Programming Example ..........B-12 B-6.

  • Page 13: Introduction

    SR50AT-Series Sonic Ranging Sensor Introduction The SR50AT, SR50AT-316SS, and SR50ATH are sonic ranging sensors that provide a non-contact method for determining snow or water depth. They determine depth by emitting an ultrasonic pulse and then measuring the elapsed time between the emission and return of the pulse. An air temperature measurement sensor is included to correct for variations of the speed of sound in air.

  • Page 14: Quickstart

    SR50AT-Series Sonic Ranging Sensors QuickStart Short Cut is an easy way to program your datalogger to measure the SR50AT and assign datalogger wiring terminals. Short Cut is available as a download on and the ResourceDVD. It is included in installations of www.campbellsci.eu...
  • Page 15 Data defaults to meters, which can be changed by clicking the Unit of measure box and selecting cm, ft, or in. Enter the Distance to base, which is the distance from the SR50AT’s wire mesh face to the ground. SDI-12 Address defaults to 0. Enter the correct SDI-12 Address for the SR50AT if it has been changed from the factory-set default value.

  • Page 16: Overview

    SR50AT. The SR50AT is factory configured as an SDI-12 sensor (address 0) because Campbell dataloggers typically use the SDI-12 format. To use the RS-232 or RS-485 format, three jumpers inside the SR50AT need to be moved (Section 9.1, Disassembly/Assembly Procedures , and Appendix C, (p.

  • Page 17: Specifications

    SR50AT-Series Sonic Ranging Sensors Specifications Features: • Wide operating temperature range • Compatible with Campbell Scientific CRBasic dataloggers: CR200(X) series, CR300 series, CR6 series, CR800 series, CR1000, CR3000, and CR5000 Power Requirements: 9 to 18 Vdc Quiescent Power Consumption (no heater) SDI-12 Mode: <...

  • Page 18: Installation

    SR50AT-Series Sonic Ranging Sensors Temperature Measurement: 0 to 50 °C (32 to 122 °F) Accuracy: ±0.2 °C -45 to 0 °C (–49 to 32 °F) Accuracy: ±0.75 °C Chassis Types: Aluminum or 316L stainless steel Sensor Length: 10.1 cm (4 in) Sensor Diameter: 7.6 cm (3 in)

  • Page 19: Sensor Mounting

    FIGURE 7-1. Beam Angle Clearance 7.1.2 Mounting Height Mount the SR50AT so that the face of the transducer is at least 50 cm (19.7 in) away from the target. However, mounting the sensor too far from the target can increase the absolute error. For example, if your sensor is measuring snow depth in an area that will likely not exceed 1.25 m (4.1 ft) then a good height to...

  • Page 20: Mounting Options

    FIGURE 7-2. Distance from Edge of Transducer Housing to Grill 7.1.3 Mounting Options To achieve an unobstructed view for the SR50AT’s beam, the SR50AT is typically mounted to a tripod mast, tower leg, or user-supplied pole using the CM206 6-ft crossarm or a pipe with a 1-inch to 1.75-inch outer diameter. The #19517 mounting kit attaches directly to the crossarm or pipe.

  • Page 21: Mounting Kit

    SR50AT-Series Sonic Ranging Sensors FIGURE 7-4. SR50AT-316SS Mounted to a Crossarm via the #19517 Mounting Kit with the Temperature Sensor Housed in a RAD06 Radiation Shield FIGURE 7-5. SR50AT Mounted to a #19484 Mounting Stem...

  • Page 22: Sdi-12 Wiring

    SR50AT-Series Sonic Ranging Sensors FIGURE 7-6. SR50AT-316SS Mounted to a Crossarm via the #19484 Stem/Nu-Rail Fitting with the Temperature Sensor Housed in a RAD06 Radiation Shield SDI-12 Wiring Power down your system before wiring the SR50AT. Never CAUTION operate the sensor with the shield wire disconnected. The shield wire plays an important role in noise emissions and susceptibility as well as transient protection.

  • Page 23: Sdi-12 Programming

    The distance to target readings that are obtained from the sensor are referenced from the metal mesh on the face of the transducer. The SR50AT projects an ultrasonic beam that can pick up objects in its field of view that is 30° or less.

  • Page 24: Quality Numbers

    1 second due to the long communication times associated with the 1200 bps data rate. If the SR50AT rejects a reading or does not detect a target, zero will be output for distance to target or –999 for depth values.

  • Page 25: Sr50At-Cbl

    Command M9 is used to obtain a temperature measurement without a distance reading. The M9 command makes it possible for the SR50AT to function as an SDI-12 temperature sensor. If the internal SR50AT temperature correction needs to be bypassed, the temperature output setting will need to be turned off for RS-232 and RS-485 modes.

  • Page 26: Sdi-12 Measurements

    SR50AT-Series Sonic Ranging Sensors SDI-12 Measurements 8.3.1 SDI-12 Addresses The SR50AT can be set to one of ten addresses (0 to 9) which allows up to ten sensors to be connected to a single digital I/O channel (control port) of an SDI-12 datalogger.

  • Page 27: Sdi-12 Commands

    SR50AT-Series Sonic Ranging Sensors TABLE 8-2. SDI-12 Commands SDI-12 Command Command Function/Description Values Returned Distance-Metres aM1! Distance-Metres, Quality Number D, Q aM2! Distance-Metres, Temperature °C D, T aM3! Distance-Metres, Quality Number, Temperature °C D, Q, T aM4! Snow Depth Metres, Quality Number, Temperature...

  • Page 28: Maintenance And Troubleshooting

    Where n = numbers 1 to 9 Maintenance and Troubleshooting The SR50AT’s electrostatic transducer requires equal pressure on both sides. Vent holes in the transducer housing are used to equalize pressure. Desiccant (pn #4091) placed inside the transducer housing helps prevent condensing humidity.

  • Page 29: Disconnect Cable From Sensor

    SR50AT-Series Sonic Ranging Sensors FIGURE 9-1. Disconnect Cable from Sensor FIGURE 9-2. Remove Six Screws from the Transducer Housing...

  • Page 30: Remove Transducer Housing And Disconnect Wires

    SR50AT-Series Sonic Ranging Sensors FIGURE 9-3. Remove Transducer Housing and Disconnect Wires FIGURE 9-4. Location of Desiccant in Transducer Housing Assembly...

  • Page 31: Data Interpretation And Filtering

    FIGURE 9-6. Remove the Two Flat Phillips Screws to Expose the PCB Carefully reassemble in reverse order. Data Interpretation and Filtering 9.2.1 Data Interpretation Although not common, the SR50AT can occasionally output invalid reading indicators if it was unable to obtain a measurement. For distance to target...

  • Page 32: Data Filtering

    9.2.2 Data Filtering There are scenarios where the SR50AT can produce values with higher than expected errors. For example, in very low density snow, very little echo is returned back to the sensor. The increase in echo quality numbers is an indication of the weak signals.

  • Page 33: Importing Short Cut Code Into Crbasic Editor

    Appendix A. Importing Short Cut Code Into CRBasic Editor This tutorial shows the following: How to import a Short Cut program into a program editor for • additional refinement • How to import a wiring diagram from Short Cut into the comments of a custom program Short Cut creates files, which can be imported into CRBasic Editor.

  • Page 35: Example Programs

    'Program: SR50AT_SDI12_FILTER.CR1 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 36 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.

  • Page 37: Cr6 Sdi-12 Program

    'Program: SR50AT_SDI12_FILTER.CR6 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 38 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.

  • Page 39: Rs-232 Example Programs

    'Program: SR50AT_RS232_FILTER.CR1 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 40 'distance in non-volatile memory. If power is lost at the site, the 'initial distance value will be restored.' 'A control flag is used to initiate the SR50AT measurement cycle. This 'allows for manual control in the field to check distances without 'waiting for the correct time interval to occur.
  • Page 41 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.

  • Page 42: Rs-485 Example Programs

    B.3.1 CR1000 Programming Example Using an MD485 and SC110 9-pin Male Connector For this example, an MD485 is used to convert the SR50AT RS-485 signals to RS-232. A SC110 9-pin male connector cable is used to free up the RS-232 port on the datalogger.

  • Page 43: Sr50At (Configured For Md485) Wiring To Md485 (9-Pin Connector Plugged Into Md485 Rs-232 Port

    'Program: SR50AT_RS485_MD485_PORT_C1-C2.CR1 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 44 Appendix B. Example Programs 'Default serial address of SR50AT is 33. Polling command consists of 'a lower case 'p' followed by the address and a carriage return. Const POLL_A = "p33" & CHR(13) 'Declare Variables and Units Public BattV Units...
  • Page 45 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.

  • Page 46: Cr6 Rs-485 Programming Example

    'Program: SR50AT_RS485.CR6 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 47 Public SR50AT_WtchDg_Cntr : Units SR50AT_WtchDg_Cntr = value scratch 'Array to hold 11 SR50AT measurements composed of a distance and 'quality number, and air temperature. Public SR50AT(11,3) 'Sorted array of 11 SR50AT measurements composed of a distance and 'quality number, and temperature. Measurements are sorted by the 'distance value from smallest to largest.
  • Page 48 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.

  • Page 49: Heater Program Examples

    'Program: SR50ATH_SDI12_FILTER.CR1 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 50 Appendix B. Example Programs 'A control flag is used to initiate the SR50AT measurement cycle. This 'allows for manual control in the field to check distances without 'waiting for the correct time interval to occur. It is also used by 'the datalogger to initiate an automated measurement cycle.
  • Page 51 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.

  • Page 52: Cr6 Heater Program Example

    'Program: SR50ATH_SDI12_FILTER.CR6 'This program contains a number of features not found in Short Cut. 'The initial distance value from the SR50AT head to the ground is 'measured by setting the flag SR50AT_MID to TRUE. Set this flag after 'installing the SR50AT in the field. Setting this flag will initiate 'a measurement cycle and the resulting value stored as the initial 'distance.
  • Page 53 If TimeIntoInterval (58,60,Min) Then SR50ATCtrl = True EndIf 'Set this flag to true to get the initial distance from the SR50AT 'to the ground. SR50AT_MID Then SR50ATCtrl = True 'Logic to make 11 snow depth measurements, sort them, and store 'the corrected values.
  • Page 54 Appendix B. Example Programs 'SR50ATH heater control. Voltage must be above 11.7 vdc and the 'air temperature less than 2°C to turn on the heater. BattV >= 11.7 Then AirTempC <= 2 Then HtrCntrl = True AirTempC > 3 Then HtrCntrl = False Else HtrCntrl = False...

  • Page 55: Jumper Settings

    Never install more than three jumpers and never mix the jumpers among the SDI-12, RS-232 or RS-485 locations. The other jumper located on the SR50AT places the sensor in either the normal operation mode or in the program update mode. The program mode is only used for updating the internal firmware of the sensor.
  • Page 57 The ground used with the RS-232 connector (pin 5) must use the same ground as the SR50AT. For the example below, the power for the SR50AT is coming from the datalogger. A jumper wire is used from the RS-232 connector’s pin 5 to the datalogger ground.

  • Page 58: Rs-485 Operation

    Measure On Poll or the Auto Measure Polled Output modes. You can use Campbell Scientific’s MD485 interface to connect one or more SR50AT sensors in RS-485 mode to an RS-232 device. This can be useful for...

  • Page 59: Connections For Rs-485 Mode

    Appendix D. RS-232 and RS-485 Operation sensors that require lead lengths that exceed the limits of either RS-232 or SDI-12 communications. The SR50AT can be connected directly the RS-485 port on the CR6 datalogger. D.2.1 RS-485 Wiring Using a MD485...

  • Page 60: Rs-485 Wiring To A Cr6 Datalogger

    Appendix D. RS-232 and RS-485 Operation D.3 RS-485 Wiring to a CR6 Datalogger The SR50AT is a half-duplex device and can only be used on the COM1 (C1 and C2) terminal blocks. TABLE D-4. Connections for CR6 RS-485 Mode Colour...
  • Page 61 To enter Setup mode, type “setup” in the terminal window and press the Enter key. The word “setup” and all options in the setup menu are not case sensitive. The SR50AT should respond with the setup menu shown in FIGURE D-4. FIGURE D-4. SR50AT Setup Menu...

  • Page 62: Baud Rate Setting

    (19200 or 38400 bps) may be used where faster communications are required. The quiescent current draw for the SR50AT in serial mode is normally 1.25 mA for baud rates of 9600 or less. The current draw increases to 1.5 and 2.25...

  • Page 63: Address

    Appendix D. RS-232 and RS-485 Operation It is possible to download a firmware update to the SR50AT via the RS-232 or RS-485 communication interface. Higher baud rates may be desirable to speed up this process. It may take up to 30 minutes using a speed of 1200 bps, 7 minutes using 9600 bps, or 3 minutes using 38400 bps.

  • Page 64: Distance To Target Or Depth

    To obtain a valid snow depth value the parameter distance to ground must be entered in. The SR50ATT will compensate the readings for temperature. Do not use this option on the SR50AT sensor unless the SR50AT is sent valid temperature reading via the Temperature Input command. D.4.5 Distance to Ground A valid distance to ground must be entered when the SR50AT is configured to output snow depth values.

  • Page 65: Output Unit

    Appendix D. RS-232 and RS-485 Operation D.4.8 Output Unit The SR50AT always outputs the distance to the target. The units for the distance value can be set to any of the following values: • Metres • Centimetres • Millimetres •...

  • Page 66: Temperature Input Command

    “i33<CR>” – information command with factory address of 33 D.5.4 Temperature Input Command The temperature input command is used to send the SR50AT version of the sensor a temperature value that is to be used for temperature compensation. The value sent must be in degrees Celsius and should not exceed eight characters.
  • Page 67 152 to 600, where 600 is the poorest quality. TT.TT This setting must be set to Off. The SR50AT will output a –999.00 if the Temperature Output option is set to ON. VVVVV This is the diagnostic output value. Each digit represents a pass or a fail on a diagnostic test.

  • Page 68: Information Message Output

    Appendix D. RS-232 and RS-485 Operation D.6.2 Information Message Output The measurement output string for the SR50AT is as follows: <STX>aa;SSSSS;H.H;F.F;BBBBB;WWWWW<CR><LF><ETX> <STX> is the hex character 0x02 (2 in decimal) These two characters are the serial address of the sensor. The default is 33.

  • Page 69: Tera Term Quickstart

    Click on the radio button next to Serial. Click on the down arrow to the far right of Port and pick the COM port you are using to communication with the SR50AT/T. NOTE COM port 4 is used in the examples in this section. Your COM port may be different.
  • Page 70 FIGURE E-2. Setup Selections Select Terminal from the drop-down menu list in Setup. The SR50AT/T does not echo characters sent to it. To see what you’re typing, Local Echo needs to be switched on by checking the box next to Local Echo (FIGURE E-3).
  • Page 71 Appendix E. Tera Term QuickStart Select Window from the drop-down menu list in Setup. Change the title in the Window setup to SR50AT 9600 Baud. The title is displayed at the top of the terminal session screen. By default, Tera Term works with white characters on a black background, but can be changed to black characters on a white background.

  • Page 72: Configuring The Serial Port

    Appendix E. Tera Term QuickStart Select Serial port from the drop-down list in Setup. Change the port to reflect what you will be using to work with the SR50AT/T. Leave the other settings at their default values. Click the OK button when finished (FIGURE E-6).

  • Page 73: Firmware Update

    Configure Tera Term for Serial 9600 BPS Communication (p. E-1) Select Window from the drop-down menu list in Setup and change the title to SR50AT/T Firmware Download. The title is displayed at the top of the terminal session screen. Configure the serial port as follows (FIGURE E-8).

  • Page 74: Sending New Firmware To A Sr50At/T Sensor

    SR50AT_May_29_2007_V_1_3.TXT will be sent to a SR50ATT. This firmware update is used for either the SR50AT or SR50ATT. To send a firmware update to the SR50AT/T, the jumpers must be configured for RS-232 operation and the jumper moved from RUN to PROG. See FIGURE below.
  • Page 75 PROG (program) position. Connect to the DB-9 connector on the SR50AT/T PC board. Connect the cable back to the SR50AT/T. The cable should be providing the SR50AT/T with power. When power is reestablished, you will see a green LED light up close by the RUN/PROG jumper.
  • Page 76 You will see the following screen indicating that the transfer process is occurring in Tera Term. Directly above the Send File window, you will see the lines of code being sent to the SR50AT/T. Do not click on any of the buttons in the Send File window. The window will automatically disappear after the file has been sent.
  • Page 77 Appendix E. Tera Term QuickStart 13. After the reprogramming is successful, disconnect power from the sensor and disconnect the serial cable from the DB-9 connector. 14. Move the jumper from PROG back to RUN. 15. Reassemble the sensor. Line up the notch on the disk/circuit assembly with the V in the main metal housing.
  • Page 78 Appendix E. Tera Term QuickStart E-10...

  • Page 79: Sr50Ath Heater Operation

    Always use the heater option wired to switched 12 Vdc source. For battery- operated solar-powered sites, Campbell Scientific recommends that the heater’s power be turned off when icing conditions are not occurring to reduce power requirements.

  • Page 80: Heater Maintenance

    The procedure to disassemble the SR50ATH for desiccant replacement or transducer replacement is as follows: Remove the six Phillips screws on the outermost hole pattern. NOTE The screws used on the SR50AT have changed from the slotted type to Phillips.
  • Page 81 Appendix F. SR50ATH Heater Operation Separate the housing from the sensor body and disconnect the connector from the transducer to the main sensor body. To replace the desiccant, remove the desiccant holder plate with the Phillips 4-40 screw. Cutting the tie strap will allow the old packets to be removed for replacement.
  • Page 82 Appendix F. SR50ATH Heater Operation Remove the three screws from the innermost hole pattern as shown. Replace the transducer assembly and the second O-ring that seats under the transducer assembly. Reassemble the sensor in the reverse order. Please observe the orientation of the parts, wiring, and desiccant.
  • Page 84 Santo Domingo, Heredia 40305 SOUTH AFRICA COSTA RICA • cleroux@csafrica.co.za • info@campbellsci.cc www.campbellsci.co.za www.campbellsci.cc Campbell Scientific Southeast Asia Co., Ltd. Campbell Scientific Ltd. 877/22 Nirvana@Work, Rama 9 Road Campbell Park Suan Luang Subdistrict, Suan Luang District 80 Hathern Road Bangkok 10250...

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