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Copyright ©2020 Geolux d.o.o. All rights reserved.

GLX-RSS-2-300 W

Non-Contact Flow Meter

User Manual

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Summary of Contents for RSS-2-300 W

Page 1: ...Copyright 2020 Geolux d o o All rights reserved GLX RSS 2 300 W Non Contact Flow Meter User Manual ...

Page 2: ...GLX RSS 2 300 W User Manual Page 2 of 28 ...

Page 3: ...ven radar technology The use of top quality components and advanced signal processing algorithms ensures that Geolux flow meter can be used in various applications and environments Although we are certain that you are more than capable of connecting the Flow Meter to your system we have created this User Manual to assist you in setting up and using Geolux flow meter device Should there be any ques...

Page 4: ...magnetic wave reflected from the flowing water surface The frequency shift is caused by the Doppler effect of the moving surface on the electromagnetic wave As the relative speed between the radar sensor and the water surface increases the detected frequency shift also increases thus enabling the flow meter to precisely determine the surface flow velocity The flow meter is able to detect water flo...

Page 5: ... 3dB Elevation Measurement range Resolution Accuracy Installation height above the water 24 075 108 0 02 0 01 24 125 110 12 24 1 24 175 20 112 15 0 15 GHz dBm dBm m s m s m Power supply voltage 9 0 12 0 27 0 V Power Operational mode Sleep mode 950 85 mW mW Alarm output maximal current 60 mA Alarm output maximal voltage 30 VDC Analog output maximal voltage 30 VDC Operational temperature range 40 85...

Page 6: ...supply for the Radar Speed Sensor is provided on this pin The Radar Speed Sensor power supply voltage must be in the range 9 VDC to 22 VDC and the power supply must be able to provide at last 0 65W 3 Green RS232 TxD RS 232 data transmit signal 4 Yellow RS232 RxD RS 232 data receive signal 5 Grey GND Signal ground 6 Pink CAN H CAN2 0B high signal optional 7 Blue CAN L CAN2 0B low signal optional 8 ...

Page 7: ...the cable but this must be specified as option on order of the sensors Several communication protocols are available and custom on request Details of communication protocols are described later in this manual 3 2 Serial RS 485 interface Serial RS 485 interface is implemented as standard industrial half duplex communication interface Communication interface is short circuit and overvoltage internal...

Page 8: ...ty in connection of the sensor to PLCs loggers or data concentrators Signal range and function for 4 20 mA analog output can be configured in setup application so the sensor will be able to signal best suitable value range with available current range Current step in the sensor is 0 3 µA limiting resolution possible for the value signaling and care has to be taken in the setup of minimal value to ...

Page 9: ...racy it is important to properly select measurement site and to install sensor with proper horizontal and vertical tilt angle The tilt angle to horizontal plane for surface velocity sensor should be between 30 and 60 and if instrument is mounted with reasonable tolerances to the pole this should be maintained The instrument should be oriented in parallel with the water flow direction For optimal o...

Page 10: ...ing algorithms and will continuously with measurement data report also measurement quality Quality indicator value is in range from 0 the best quality to 3 the worst quality and can be used to interpret data in the analysis software with better understanding and confidence For example when radar is mounted on the railway bridge one of common applications measurements will be very good quality most...

Page 11: ...s of two radars in the same range to get interference Similarly as interference from two or more surface velocity radars on the same location it is very unlikely that other radiation sources in K band will affect radar measurements also It is possible that some wideband radiation sources can introduce small and impulse interference for the short period of time but this should not or it is very unl...

Page 12: ... with special techniques to achieve accurate measurements even in the very small SNR environments so the required surface roughness of 1mm is usually enough for the precise measurements When selecting location for surface velocity sensor additional care must be taken to avoid reflected power away from the radar red arrow to hit moving objects gray cloud on the side of water channel as this can cau...

Page 13: ...MEA like communication protocol is used to deliver flow measurements over RS 232 interface Detailed description of the protocol is given in the Chapter 6 of the User Manual 5 2 Serial RS 485 interface Serial RS 485 interface is used for connecting multiple flow meters to a single data logger RS 485 interface uses a different protocol then the protocol used over RS 232 interface in order to allow m...

Page 14: ...ed with the checksum which makes this protocol extremely reliable NMEA protocol is singe direction protocol data is only transmitted from the flow meter At RS 232 interface the device periodically outputs following data sentences Direct flow measurement report RDTGT D1 S1 L1 CSUM CR LF RDTGT The keyword sent on the beginning of each detection report This sentence is sent whenever there is detected...

Page 15: ...l estimate based on sensor vibration Q2 Quality of signal estimate signal quality CSUM The check sum of the characters in the report from to excluding these characters Quality of signal factor 0 Excellent measurement quality 1 Good measurement quality 2 Low measurement quality 3 Unacceptable measurement quality 6 2 Servicing protocol RS 232 The servicing protocol is used to retrieve and modify dev...

Page 16: ... Change SNR threshold set_thld_snr 0 5120 Changes the minimum threshold SNR It is set as value in dBm 256 If the current SNR is below the defined threshold the instrument will not report any velocity and will assume there is no water movement Change detected targets direction set_direction in set_direction out set_direction both Changes the parameter that specifies which flow direction will be rep...

Page 17: ...ity Configure the 4 20mA output type Set output value for 4 20mA set_420_min value set_420_max value Configure the 4 20mA output minimum value for 4mA and maximum value for 20mA Value is set for currently configured unit Value number is accepted as float Set dead time set_dead_time 3 100 Configure dead time in seconds which ensures no signals will be taken in consideration after power up Sleep mod...

Page 18: ...tocol RS 485 A different data protocol is used on RS 485 interface which allows connection of multiple units on the single RS 485 line Before the units are connected on the single RS 485 bus each unit must be configured with a different device identifier The device identifier is configured by using the PC application Please check Chapter 7 for instructions The request response protocol unlike NMEA...

Page 19: ...5 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 Second possible command is send from the data logger to the flow meter 0x2b ID CSUM 0x2b The first byte sent in the request is character Its ASCII value in HEX is 0x25 ID Exactly two bytes long This is the unit ID written as two ASCII characters For example i...

Page 20: ...tes 0x30 0x32 CSPEED The speed readout of current speed in currently selected units formatted as real float number with exactly three digits after the decimal dot separator For example if the current speed is 5 7143 it will be reported as 5 714 ASPEED The speed readout of averaged speed in currently selected units formatted same as current speed CDIR 1 for outgoing and 1 for incoming flow SIGLEVEL...

Page 21: ...gister to read LOW Sensor ID reg Count of regsters 0X00 High 0X01 Low read only 1 register CRC16 0X84 CRC Low 0X0A CRC High Table 5 Slave sensor response format Name Addr Fun Byte count Data CRC16 Length 1 byte 1 byte 1 byte 2 bytes H L 2 bytes L H Example 0X01 0X03 0X02 0X00 0X01 0X79 0X84 Table 6 Response example Name Content Detail Address 0X01 Slave address Sensor id Function 0X03 Read slave i...

Page 22: ...e 0 15000 mm s Read averaged speed 0X0005 2 byte 0 360 Read tilt angle 0X0006 2 byte 0 incoming 1 outgoing Read flow direction 0X0007 2 byte 1 512 Read averaging length 0X0008 2 byte 0 8 Read defined PGA gain sensitivity 0X0009 2 byte 0 both 1 incoming 2 outgoing Read flow direction filter setting 0000A 2 byte 0 100 Read sensitivity value 0X000B 2 byte 0 Read device type always 0 0X000C 2 byte 0 3...

Page 23: ...R level dBM 256 0x0015 2 byte 0 10000 Read averaged SNR level dBM 256 0x0016 0x001F 2 byte 0 Reserved always 0 Table 8 Writing dana to the sensor Fun Data start Addr Data Length Data Range Detail 0X06 0X0000 2 byte 1 255 Change sensor id 0X0001 2 byte 0 9600 1 38400 2 57600 3 115200 4 19200 Change baud rate 0X0002 2 byte 0 mm s 1 m s 2 mph 3 km h 4 fps 5 fpm Change velocity unit type 0X0007 2 byte...

Page 24: ...s not established Picture 3 Flow Meter Configurator main window To connect the Configurator utility with the flow meter connect your PC to the speed radar using an RS 232 serial cable connection Then select the Radar Connect menu option in the Configurator Utility and choose the appropriate COM port number The Configurator will try to establish a data link between your PC and the flow meter device...

Page 25: ...n bitrate used on RS 232 and RS 485 interfaces for communication with the radar device ID address the device identifier used if multiple devices are connected together over RS 485 interface Protocol RS 485 used protocol on RS 485 interface Detection Dead time dead time in which ensures no signals will be taken in consideration after power up Filter length if moving average filter is used select th...

Page 26: ...ws Discharge is calculated by multiplying mean flow velocity and channel cross section area The cross section area is the area of the slice in the water column made perpendicular to the flow direction For ideal case let us assume the rectangular channel profile with constant flow velocity at all points as in Picture 5 Picture 5 Simple channel diagram The discharge can be calculated according to th...

Page 27: ...urement The mean cross section flow velocity needs to be determined from measured surface flow velocity Studies performed by USGS reveal that typically the mean velocity is 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 measur...

Page 28: ...GLX RSS 2 300 W User Manual Page 28 of 28 9 Appendix A Mechanical Assembly ...

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