Geolux RSS-2-300WL User Manual
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Geolux RSS-2-300WL User Manual

Non-contact flow meter
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RSS-2-300WL
Non-Contact Flow Meter
User Manual
v6.4.8
Copyright ©2022 Geolux d.o.o. All rights reserved.

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Summary of Contents for Geolux RSS-2-300WL

  • Page 1 RSS-2-300WL Non-Contact Flow Meter User Manual v6.4.8 Copyright ©2022 Geolux d.o.o. All rights reserved.
  • Page 2 Geolux level meter can be used in various applications and environments. We have created this User Manual to assist you in setting up and using the Geolux instrument. Should there be any questions left unanswered, please feel free to contact us directly: Geolux d.o.o.

  • Page 3: Table Of Contents

    Contents 1. Introduction 2. Electrical Characteristics 3. Cable Pin-Out 3.1. Serial RS-232 Interface 3.2. Serial RS-485 Interface 3.4. Analog 4 – 20 mA Output 3.5. SDI-12 Interface 4. Installing the Flow Meter 4.1. Instrument Mounting and Location Selection 4.2. Measurement Quality Indicator 4.3.

  • Page 4: Introduction

    Configuration of the measurement parameters like channel profile cross section, material of the edges and the location of the sensor above the water can be easily set using Geolux PC configuration application - Geolux Instrument Configurator. When parameters are set properly, the sensor will calculate flow with an accuracy of approximately ±1% compared to ADCP...

  • Page 5: Electrical Characteristics

    RSS-2-300WL User Manual Electrical Characteristics The electrical characteristics of the Geolux RSS-2-300WL flow meter are given in Table 1. Table 1. Electrical Characteristics Parameter Unit Communication interface: RS-232 interface speed 1200 115200 RS-485 interface speed 1200 115200 Radar Velocity Sensor Frequency 24.075...

  • Page 6: Cable Pin-Out

    Alarm SW or 4–20 mA Alarm 1 - open collector switch signal max. Secondary (Optional) 60mA Purple 4 – 20 mA Sink for 4 – 20 mA analog interface. Connect sensing device as pull-up to sink the current RSS-2-300WL Non-Contact Flow Meter...

  • Page 7: Serial Rs-232 Interface

    GND (grey wire) is required on pin 5 of the DB-9 connector. Optionally Geolux can supply a cable with a DB-9 connector connected to the cable, but this must be specified when ordering the sensors.

  • Page 8: Analog 4 - 20 Ma Output

    Picture 3. If a sensing resistor is used, resistance should be selected from the range of 10 Ω up to 500 Ω with a recommended value of 100 Ω for the sensing resistor. RSS-2-300WL Non-Contact Flow Meter...

  • Page 9: Sdi-12 Interface

    For hydrological applications, SDI-12 communication interface is a valid option and the instrument is natively able to communicate directly with SDI-12 master devices (dataloggers etc.). RSS-2-300WL Non-Contact Flow Meter...

  • Page 10: Installing The Flow Meter

    (pole, bridge fence, etc.) must be solid and without vibrations. There should be no vegetation between the radar and the measurement area because it could affect measurement accuracy. Water surface directly below the sensor should be void of vegetation, rocks, sand deposition or other obstacles that could affect measurement. RSS-2-300WL Non-Contact Flow Meter...
  • Page 11 If strongly turbulent flow can be expected at monitoring site, then the filter length of the radar should be configured to 120 or more. 5° 12° Picture 5. Radar Beam Widths and Coverage Areas RSS-2-300WL Non-Contact Flow Meter...

  • Page 12: Measurement Quality Indicator

    4.2. Measurement Quality Indicator Geolux RSS-2-300WL instrument is constantly calculating various parameters of the signal in the signal processing algorithms and will continuously, along with measurement data, report the measurement quality. The quality indicator value ranges from 0 (best quality) to 3 (worst quality) and can be used to interpret the data in the analysis software with better understanding and confidence.

  • Page 13: Rain And Wind

    RSS-2-300WL User Manual 4.3. Rain and Wind Geolux RSS-2-300WL instrument has integrated internal software filters to filter out effects of rain, fog, or wind both for surface velocity and for radar distance sensor. These filters however have some limitations. Majority of measurement inaccuracies caused by environmental factors can be solved by proper sensor installation.

  • Page 14: Fogging And Evaporation

    SNR (Signal to Noise Ratio) can be achieved which enables greater measurement accuracy. Geolux surface velocity radar is designed with special techniques to achieve accurate measurements even in environments with very small SNR, so the required surface roughness of 1 mm is usually enough for precise measurements.
  • Page 15 RSS-2-300WL User Manual When selecting a location for installing the RSS-2-300WL instrument, additional care must be taken to avoid that any part of the radar beam that is reflected away from the instrument (red arrow) hits any nearby moving objects (grey cloud). Such additional radar reflections can significantly affect measurement accuracy.

  • Page 16: Surface Velocity Radar Settings

    HS protocol is a simple request-response protocol for the simplest applications. Modbus RTU protocol is a standardized protocol which is commonly used in automation and instrumentation as it provides all measurements with detailed diagnostics of device operation and the possibility to change the instrument’s operating parameters. RSS-2-300WL Non-Contact Flow Meter...
  • Page 17 One or two bits may be used. The default setting is even parity and one stop bit. RSS-2-300WL Non-Contact Flow Meter...
  • Page 18 700 mm/s up to 1500 mm/s, it is recommended to configure the maximum value to slightly above 1500 mm/s (for example 2000 mm/s). Alternatively, if the resolution is not critical, then the maximum value for 4 – 20 mA output can be left to the instrument maximum of 15000 mm/s. RSS-2-300WL Non-Contact Flow Meter...
  • Page 19 700 mm up to 5000 mm, it is recommended to configure the maximum value to slightly above 5000 mm/s (for example 6000 mm). Alternatively, if the resolution is not critical, then the maximum value for 4 – 20 mA output can be left to the instrument maximum. RSS-2-300WL Non-Contact Flow Meter...
  • Page 20 However, when the surface velocity changes, it will take more time for the new measurement to be reported. Typically, this parameter should be set to a value between 50 and 200. For highly turbulent water, longer filter length is recommended. RSS-2-300WL Non-Contact Flow Meter...
  • Page 21 Standard deviation - This type of filter is similar to the moving average filter. It takes a number of raw measurements (as defined by the Filter Length parameter), then removes 20% of outliers, and calculates the average of the remaining 80% of values. RSS-2-300WL Non-Contact Flow Meter...
  • Page 22 Accepted values are decimal numbers between 0 and 1. When the IIR constant value is closer to 0.0, the filter response will be slower. When the IIR constant value is closer to 1.0, then the filter response will be faster. RSS-2-300WL Non-Contact Flow Meter...
  • Page 23 The default setting should be Maximum peak. In specific cases, such as when a water level needs to be measured, but there is a lot of vegetation protruding from the water surface, Last peak detector type should be used. RSS-2-300WL Non-Contact Flow Meter...
  • Page 24 RS-232. When mm/s and cm/s units are used, the measured values will not be multiplied by 10. The Geolux Instrument Configurator PC application internally handles the multiplication factor which is used over RS-232 protocol, and it displays the correct values to the user.
  • Page 25 4 metres, it will report that the water level is 1 metre, because the water is 1 metre above the gauge-zero level. For user convenience, this parameter can also be indirectly set by inputting the current staff gauge reading. RSS-2-300WL Non-Contact Flow Meter...
  • Page 26 If there is no attempt to connect to the device over RS-232 within 20 seconds, the device will automatically go back to sleep mode. The device consumes only 0.08W while in standby mode, and 0.04 W while in sleep mode. RSS-2-300WL Non-Contact Flow Meter...

  • Page 27: Data Interface

    RSS-2-300WL User Manual Data Interface Geolux RSS-2-300WL flow meter offers multiple data interfaces, in order to make the integration of the device with existing SCADA/telemetry systems easy. 6.1. Serial RS-232 Interface Serial RS-232 interface is used for direct connection of a single surface velocity radar unit with the computer.

  • Page 28: Data Protocols

    RSS-2-300WL User Manual Data Protocols Geolux RSS-2-300WL flow meter supports the following data protocols: • NMEA-like protocol on RS-232 interface that constantly outputs the detected speed, distance (level), discharge and reflected signal power, and also the current measured tilt angles of both the surface velocity sensor and the level meter •...
  • Page 29 Discharge report $DIS,D*CSUM<CR><LF> $DIS: The keyword sent in the beginning of each discharge report. The measured discharge, in defined units. CSUM: The check sum of the characters in the report from $ to * excluding these characters. RSS-2-300WL Non-Contact Flow Meter...
  • Page 30 (betwee n -1 and +1 degrees). CSUM: The check sum of the characters in the report from $ to * excluding these characters. RSS-2-300WL Non-Contact Flow Meter...

  • Page 31: Servicing Protocol (Rs-232)

    To make radar configuration easy, Geolux provides the Geolux Instrument Configurator utility application. Regular users do not need to be concerned about the servicing protocol used between the Geolux Instrument Configurator and the surface velocity radar device. Geolux Instrument Configurator is described in chapter 8 of this manual.
  • Page 32 700 mm/s up to 1500 mm/s, it is recommended to configure the minimum value to slightly below 700 mm/s (for example 500 mm/s). Alternatively, if the resolution is not critical, then the minimum value for 4 – 20 mA output can be left to the instrument minimum of 0 mm/s. #set_an420_min=<value> RSS-2-300WL Non-Contact Flow Meter...
  • Page 33 Typically, this parameter should be set to a value between 50 and 200. For highly turbulent water, longer filter length is recommended. #set_filter_len=<1-1000> RSS-2-300WL Non-Contact Flow Meter...
  • Page 34 Accepted values are decimal numbers between 0 and 1. When the IIR constant value is closer to 0.0, the filter response will be slower. When the IIR constant value is closer to 1.0, then the filter response will be faster. #set_IR_constant=<0-1> RSS-2-300WL Non-Contact Flow Meter...
  • Page 35 RS-232. When mm/s and cm/s units are used, the measured values will not be multiplied by 10. The Geolux Instrument Configurator PC application internally handles the multiplication factor which is used over RS-232 protocol, and it displays the correct values to the user.
  • Page 36 Level sensor staff gauge - Setting the sensor height relative to the measurement is done using staff gauge. The sensor will output relative measurement of the actual water level based on its height above the riverbed. #set_lvl_staff_gauge=<value> RSS-2-300WL Non-Contact Flow Meter...
  • Page 37 SDI-12 sleep mode, it’s necessary to power- cycle the device and then use the Geolux Instrument Configurator PC application to connect to the device within 20 seconds after power-up. If there is no attempt to connect to the device over RS- 232 interface within 20 seconds, the device will automatically go back to sleep mode.
  • Page 38 # an420_min:0.000 # an420_max:10000.000 # min_velocity:0.000 # max_velocity:15000.000 # level_sensor:2 # sdi12_sleep:0 # discharge_units:liters # lvl_firmware:237 # lvl_units:mm # lvl_filter_type:4 # lvl_filter_len:15 # lvl_deadzone_min:200.000 # lvl_deadzone_max:15000.000 # lvl_420_min:0.000 # lvl_420_max:15000.000 # lvl_sensor_height:0.000 # lvl_peak_detector:0 # lvl_aplitude_threshold:0 RSS-2-300WL Non-Contact Flow Meter...

  • Page 39: Request-Response Protocol (Rs-485)

    For example, if the current averaged level is 5.7143, it will be reported as 5.714, or in HEX values: <0x35><0x2E><0x37><0x31><0x34><0x33>. CSUM: Checksum, calculated by adding in modulo 256 the two byte values of the ID and all byte values from the SPEED. RSS-2-300WL Non-Contact Flow Meter...

  • Page 40: Modbus Protocol (Rs-485)

    Modbus. Modbus is a request-response protocol where a master (such as datalogger) sends out requests, and slave devices (such as RSS-2-300WL sensor) respond. The request and response format, with exam- ples is given in tables 3-6.
  • Page 41 Table 7 defines the data returned by the unit when the master requests that the register is read. Table 8 defines how to write device configuration. Rows highlighted in blue denote the important values measured by the sensor. Rows highlighted in green denote operating parameters that can be changed in the field. RSS-2-300WL Non-Contact Flow Meter...
  • Page 42 Read averaged speed in selected unit (integer part) 0x0013 2 byte 0 – 65535 Read averaged speed in selected unit (decimal part * 1000) 0x0014 2 byte 0 – 10000 Read instantaneous SNR level (dBM * 256) RSS-2-300WL Non-Contact Flow Meter...
  • Page 43 2 → moving average 3 → median filter 4 → standard deviation 0x002A 2 byte 0-1000 Read level sensor IR filter con- stant 0x002B 2 byte 0 – level range Read level sensor active zone minimum in defined units RSS-2-300WL Non-Contact Flow Meter...
  • Page 44 Standard deviation Standard deviation of measurement 0x0032 2 bytes 0 – 360 Level sensor x-axis tilt angle 0x0033 2 bytes 0 – 360 Level sensor y-axis tilt angle 0x0034 2 bytes Read level sensor firmware code RSS-2-300WL Non-Contact Flow Meter...
  • Page 45 0 – level range Change level sensor active zone minimum in defined units 0x002D 2 byte 0 → mm Change level sensor unit type 1 → cm 2 → m 3 → in 4 → ft RSS-2-300WL Non-Contact Flow Meter...

  • Page 46: Sdi-12

    .. aD9! a0<CR><LF> No values are returned for additional data. Start Measurement aM!/aMC! ammm9<CR><LF> 9 values are ready within mmm seconds for M command and 12 values are ready within mmm seconds for C command RSS-2-300WL Non-Contact Flow Meter...
  • Page 47 +d – direction filter for velocity Factor 0 – both, 1 – incoming, 2 – outgo- Set Direction Filter aXGDFT+d! a+d<CR><LF> +d – direction filter for velocity Factor 0 – both, 1 – incoming, 2 – outgo- RSS-2-300WL Non-Contact Flow Meter...
  • Page 48 +d – measurement unit for level Unit for Discharge 0 – m3/s, 1 – liters, 2 – ft3/s Set Measurement aXGDUN+d! a+d<CR><LF> +d – measurement unit for level Unit for Discharge 0 – m3/s, 1 – liters, 2 – ft3/s RSS-2-300WL Non-Contact Flow Meter...
  • Page 49 Device supports all other commands required by SDI-12 v1.3 and will respond to them but all relevant data can be acquired using the commands from the table above. RSS-2-300WL Non-Contact Flow Meter...

  • Page 50: Radar Configurator Utility

    Picture 7. Geolux Instrument Configurator Main Window To connect the Geolux Instrument Configurator with the flow meter, connect your PC to the radar using a serial cable connection. Then, click the Connect button in the upper left corner and select Flow Meter from the window which appears.
  • Page 51 RSS-2-300WL User Manual Picture 8. Geolux Instrument Configurator – Data View Clicking the Settings button enables the user to configure the flow meter or upgrade the device to a newer firmware version. The device settings are divided into 3 groups: Interfaces, Processing and Measurement.
  • Page 52 Picture 9. Geolux Instrument Configurator – Settings View Geolux Instrument Configurator also enables echo curve acquisition. Navigating to the Echo Curve tab and clicking the Load echo curve button loads the current echo curve. The echo curve plot shows both the incoming and outgoing directions with yellow and blue lines respectively.
  • Page 53 Clicking the Stop button stops the acquisition of the raw data, while clicking the Clear button clears the previously acquired data. Picture 11. Geolux Instrument Configurator - Raw Data View Navigating to the Profile tab enables the user to define the channel profile geometry and discharge parameters which are used for discharge calculation.

  • Page 54: Configuring The Unit For Discharge Calculation

    8.1.1. and 8.1.2. Picture 14. Select a Shape or Define the Channel Profile Geometry Manually RSS-2-300WL Non-Contact Flow Meter...

  • Page 55: Defining The Channel Profile Geometry Manually

    After inputting or changing the value, the Set button will appear. The user has to click the Set button to confirm the change. Picture 16. Radar Position RSS-2-300WL Non-Contact Flow Meter...
  • Page 56 Picture 18. In the preview window the user must select the unit type corresponding to the values. After clicking the Import buttn in the preview window, the channel geometry table will be filled with the values from the .csv file. Picture 18. Import .csv File Preview Window RSS-2-300WL Non-Contact Flow Meter...
  • Page 57 .xml file by clicking the Save configuration button. The saved configuration can later be loaded from the created .xml file by clicking the Load configuration button and saved to the device by clicking the Save changes button. RSS-2-300WL Non-Contact Flow Meter...

  • Page 58: Selecting A Predefined Channel Profile Shape

    Picture 21. Defining the Discharge Parameters 8.1.2. Selecting a Predefined Channel Profile Shape After clicking the Select profile shape button, Picture 14, or Select shape button, Picture 21, a new window appears with 9 predefined shapes from which the user can choose. Picture 22. Predefined Shapes RSS-2-300WL Non-Contact Flow Meter...
  • Page 59 The required y offset distance is clearly show in the picture, as well as the values defined in the previous step. If changes need to be made to the values from the previous step, it can be done by clicking the Back button. Picture 24. Defining the y Offset of the Radar RSS-2-300WL Non-Contact Flow Meter...
  • Page 60 The next step is to define the x offset of the radar. Picture 24. Defining the x Offset of the Radar Defining the x offset of the radar concludes the channel profile geometry definition. Picture 26. Channel Geometry Defined RSS-2-300WL Non-Contact Flow Meter...
  • Page 61 The last step is to define the discharge parameters as described in chapter 8.1.1., Picture 20. After setting the discharge parameters, the values will appear in green on the graph next to the channel geometry picture as seen in Picture 28. Picture 28. Defining the Discharge Parameters RSS-2-300WL Non-Contact Flow Meter...

  • Page 62: Calculating Discharge From Surface Velocity And Liquid Level

    Calculating Discharge from Surface Velocity and Liquid Level Geolux RSS-2-300WL flow meter measures surface velocity at the water surface and water level. This measurement can be used to calculate actual discharge – the total volume of water that passes through a channel cross-section in a specific period of time. Discharge measurement...
  • Page 63 80-95% of the surface velocity, the average being 85%. Knowing non-rectangular area of the stream cross-section, and knowing the surface flow velocity, the following formula can be used: Q=0.85*V*A More details about water flow measurements can be found in the following technical note: https://geolux.ams3.digitaloceanspaces.com/documents/technote3_surface_flow.pdf RSS-2-300WL Non-Contact Flow Meter...

  • Page 64: Troubleshooting

    RSS-2-300WL User Manual Troubleshooting Geolux RSS-2-300WL non-contact open channel flow meter offers multiple data interfaces, in order to make the integration of the device with existing SCADA/telemetry systems easy. Problem Possible solutions The instrument 1. Make sure that the cable is properly connected to the instrument...
  • Page 65 4-20 mA output. It is possible to misidentify the wire and to connect the bright red wire to D+ instead of dark red wire. RSS-2-300WL Non-Contact Flow Meter...
  • Page 66 ID, a bus conflict will happen and prohibit the master to correctly communicate with the slave devices. To resolve this problem, change the instrument’s slave device ID to a unique number through the Geolux Instrument Configurator PC application.
  • Page 67 (–) input of the 4-20 mA interface. 4. Check the instrument configuration parameters related to 4-20 mA output Connect the instrument over RS-232 connection to the Geolux Instrument Configurator application. Check the parameters related to 4-20 mA: 4-20 mA min.
  • Page 68 1 meter, but the water surface is expected to be between 3 and 5 meters, you can adjust the active zone to be within 3 and 5 meters, and then the instrument will discard all measurements outside of that range. RSS-2-300WL Non-Contact Flow Meter...
  • Page 69 4. Check that the distance between the instrument and the water surface is within configured active zone. Connect the instrument to the Geolux Instrument Configurator PC application over RS-232 connection. Check the active zone parameters – if the distance to the actual water surface is outside of the predefined active zone, the instrument will not be able to report the correct distance.

  • Page 70: Appendix A - Mechanical Assembly

    RSS-2-300WL User Manual Appendix A – Mechanical Assembly RSS-2-300WL Non-Contact Flow Meter...
  • Page 71 2022.

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