FTS SDI-RADAR-300WL Operating Manual Download Page 37 | Manualshive

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FTS SDI-RADAR-300WL Operating Manual Download Page 37

700-SDI-RADAR-300WL-Man Rev 2 11 Apr Mar 2022

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/48

Part# 21371

5.2.2

PROCESSING

Sensitivity level:

Configures the radar sensitivity level. The sensitivity level threshold is

used by the radar to determine whether the reflected level is too low to detect any
flow. If the instrument is incorrectly reporting flow when there is no water in the
channel, it’s necessary to increase the value of this parameter.

SNR threshold:

The minimal Signal to Noise Ratio that is required to detect the water flow.

If the actual measured SNR is lower than the threshold, the instrument will not
report any flow. Setting the SNR threshold to a higher value will result with more
robust measurements but may also result with no measurements when the water is
very smooth. As a general rule, the measurements with SNR below 10 dB may be
inaccurate, and measurements with SNR below 6 dB should not be trusted. The SNR
threshold should be set accordingly.

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Summary of Contents for SDI-RADAR-300WL

Page 1: ...EXTREME ENVIRONMENTS EXTREMELY RELIABLE SDI RADAR 300WL Non Contact Flow Meter Operating Manual 1 800 548 4264 www ftsinc com 700 SDI RADAR 300WL Man Rev 2 11 Apr 2022 Part 21371...

Page 2: ...tion Canadian Headquarters 1065 Henry Eng Place Victoria BC V9B 6B2 Canada www ftsinc com Toll free 1 800 548 4264 Local 250 478 5561 Technical support portal https ftsinc com customer care Email serv...

Page 3: ...G 8 2 10 SERIAL RS 232 INTERFACE 8 2 11 SERIAL RS 485 INTERFACE 9 2 12 ANALOG 4 20 mA OUTPUT 9 3 1 SITE SELECTION AND FEATURES 10 3 2 DETERMINING RADAR FOOTPRINT 10 3 3 INSTALLATION POSITION 12 4 1 SE...

Page 4: ...5 2 CONFIGURING Settings 32 5 2 1 Interfaces 32 5 2 2 Processing 33 5 2 3 Measurement 37 5 3 CONFIGURING THE UNIT FOR DISCHARGE CALCULATION 40 5 3 1 DEFINING PROFILE MANUALLY 40 6 1 REAL WORLD APPLICA...

Page 5: ...ling regulations and guidelines During the entire duration of use the user is obliged to determine the compliance of the necessary occupational safety measures with the current valid rules and regulat...

Page 6: ...modelling of the water flow to give stable measurements even under turbulent conditions However moderate waviness of the water surface will improve the measurement see Section 2 6 In strongly turbule...

Page 7: ...some limitations imposed by environmental conditions i e precipitation The majority of measurement inaccuracies caused by environmental factors can be solved by proper sensor installation For rain an...

Page 8: ...of 25 ns between each other Such synchronization is very complex to achieve so the interference probability between several radars on the same location is very small Similarly is very unlikely that ot...

Page 9: ...nd only a small portion of the transmitted power will be dispersed in all directions red arrows In general the ratio between power reflected to the sensor and power dispersed in all directions due to...

Page 10: ...to the radar sensor the overall signal strength is higher When less energy is reflected back as it is when the water surface roughness is lower the signal strength is lower If the amount of noise pre...

Page 11: ...15 0 49 21 15 49 2 GHz dBm dBm m ft m s ft s m ft Radar Level Sensor Frequency Beamwidth 3dB Azimuth Beamwidth 3dB Elevation Resolution Accuracy Distance 77 1 0 04 0 2 0 656 12 12 2 0 08 81 15 49 2 Gh...

Page 12: ...ignal optional 7 Blue CAN L CAN2 0B low signal optional 8 Red SDI 12 Data SDI 12 Data line 9 Orange RS485 D RS 485 data transmitter receiver low signal 10 Dark Red RS485 D RS 485 data transmitter rece...

Page 13: ...o available Details of communication protocols are described later in this manual 2 12 ANALOG 4 20 MA OUTPUT Analog current 4 20 mA output is provided for easier compatibility with older logging and c...

Page 14: ...or s ability to eliminate detected obstacles resulting in inaccurate measurements Vibrations should be avoided or reduced by any applicable means If mounting at a site that has periodic vibrations i e...

Page 15: ...6 2 95 2 07 4 m 4 0 3 6 1 2 0 84 13 12 ft 13 12 11 81 3 94 2 76 5 m 5 0 4 5 1 5 1 05 16 4 ft 16 4 14 76 4 92 3 45 6 m 6 0 5 3 1 8 1 26 19 69 ft 19 69 17 39 5 90 4 13 7 m 7 0 6 2 2 1 1 47 22 97 ft 22 9...

Page 16: ...For optimal operation and results the velocity sensor should be pointed directly upstream so that the water flows towards the instrument and with the radar beam parallel with the water flow see Figur...

Page 17: ...will improve the velocity measurements If the water flow is strongly turbulent fluctuations in measured data could be expected as well as somewhat reduced measurement accuracy If strongly turbulent f...

Page 18: ...tocol is given in the Section 4 2 4 1 2 SERIAL RS 485 INTERFACE The serial RS 485 interface is used for connecting multiple flow meters on a single RS 485 bus to a single data logger The main differen...

Page 19: ...enever there is detected flow D1 The detected flow direction 1 approaching 1 receding S1 The detected flow speed speed 3 is reported as speed 10 for m s km h mph fps fpm and as speed 1 for mm s L1 The...

Page 20: ...port L1 Current distance from sensor to water in defined units 0 being sensor reference plane If reporting 4 then there is no detected level L2 Average distance from sensor to water in defined units 0...

Page 21: ...following requests are recognized by the servicing protocol Change units type Sets the units type in which the target speed is reported set_units kmh set_units mph set_units fps set_units fpm set_unit...

Page 22: ...e level set_420_type discharge Set output value for 4 20mA Configure the 4 20mA output minimum value for 4mA and maximum value for 20mA Value is set for currently configured unit Value number is accep...

Page 23: ...A Setting is set in level units and value number is accepted as float set_lvl_420_min value set_lvl_420_max value Set level filter type Changes the level filter type 0 none 1 IIR 2 window set_lvl_filt...

Page 24: ...0 000 lvl_deadzone_max 15000 000 lvl_420_min 0 000 lvl_420_max 15000 000 lvl_sensor_height 0 000 4 2 3 REQUEST RESPONSE PROTOCOL RS 485 A different data protocol is used on RS 485 interface which allo...

Page 25: ...the unit ID is 2 then ID will be sent as 02 In HEX representation it is the following two bytes 0x30 0x32 SPEED The speed readout in currently selected units formatted as real float number With exactl...

Page 26: ...he flow meter 0x25 ID CSUM 0x25 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...

Page 27: ...are 16 bit 2 byte registers Any number of registers can be read or written over Modbus Modbus is a request response protocol where a master such as datalogger sends out requests and slave devices such...

Page 28: ...er requests register read Table 4 6 defines how to write the device configuration Rows highlighted in blue denote the important values measured by the sensor Rows highlighted in red denote operating p...

Page 29: ...al part 1000 0x0012 2 bytes 0 65535 Read averaged speed in selected unit integer part 0x0013 2 bytes 0 65535 Read averaged speed in selected unit decimal part 1000 0x0014 2 bytes 0 10000 Read instanta...

Page 30: ...evel dead zone minimum in defined units 0x002C 2 bytes 0 level range Read level dead zone maximum in defined units 0x002D 2 bytes 0 mm 1 cm 2 m 3 in 4 ft Read level unit type 0x002E 2 bytes 0 m3 s 1 l...

Page 31: ...n defined units 0x002D 2 bytes 0 mm 1 cm 2 m 3 in 4 ft Change level unit type 0x002E 2 bytes 0 m3 s 1 liters 2 ft3 s Change discharge unit type 4 2 5 SDI 12PROTOCOL The 300WL is capable of reading and...

Page 32: ...ill make It does not return the measurement to the data recorder after this command The send data D0 command must be issued to get the measurement s COMMAND S RESULTS aM aMC aC aCC ammm9 ammm12 mmm nu...

Page 33: ...d 3 Replace the a with the sensor address X COMMAND DEFINITION RESPONSE AND DETAILS aXGWUN Get velocity discharge unit Response a d In which d is the measurement unit for velocity 0 mm s 1 m s 2 mph 3...

Page 34: ...1 f Set maximum dead zone value Replace f with desired dead zone maximum value Sensor will not report a measurement higher than this value Response a f aXGSHR Get sensor height value Response a f In w...

Page 35: ...hed 5 1 CONNECTING THE FLOW METER TO THE CONFIGURATOR 1 Connect your PC to the flow meter using an RS 232 serial cable connection 2 Power cycle the sensor 3 Select the Radar Connect menu option in the...

Page 36: ...ev 2 11 Apr Mar 2022 32 48 Part 21371 5 2 CONFIGURING SETTINGS You can configure Interfaces Processing and Measurement through this tab 5 2 1 INTERFACES Normally interfaces will be set at the factory...

Page 37: ...y to increase the value of this parameter SNR threshold The minimal Signal to Noise Ratio that is required to detect the water flow If the actual measured SNR is lower than the threshold the instrumen...

Page 38: ...For highly turbulent water longer filter length is recommended Direction Filter The Direction Filter is used to choose whether the instrument will detect flow in both directions or if it should detec...

Page 39: ...through the Level Filter Length STANDARD DEVIATION Similar to the moving average filter It takes a number of raw measurements as defined by level filter length parameter then removes 20 of outliers an...

Page 40: ...ll report distance equal to 0 The threshold is used to filter noise and false readings and it is recommended to keep this value in the range 0 1000 Peak detector type Used to configure the type of alg...

Page 41: ...m s and cm s are used the measured values will not be multiplied by 10 This application internally handles the multiplication factor which is used over RS 232 protocol and it displays the correct valu...

Page 42: ...e zone minimum and active zone maximum This is the best way to filter unwanted radar reflections from other structures and objects that are present on the monitoring site that could cause false instru...

Page 43: ...face is used CONTINUOUS SCANNING MODE in this mode the device continuously performs measurements which are transmitted over the RS 232 interface and made available over Modbus and SDI 12 interfaces SL...

Page 44: ...y and water level measurement it is required to enter the channel section profile geometry into the unit and the correction coefficient which defines the ratio between surface and average velocity Thi...

Page 45: ...geometry can be set by adding points or by importing a csv file which has the channel points already defined a To add points select Add point button and fill in the x and y information for the channe...

Page 46: ...value of the point in the profile geometry There can be no more than 128 points defined The points should be ordered from left to right Any supported coordinate system can be used to define the points...

Page 47: ...d k factor and insert the information Multiple values can be defined for different water levels 5 Once on site mount the radar and adjust the Radar X and Y offset to accurately reflect the position on...

Page 48: ...rge is calculated by multiplying mean flow velocity and the 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...

Page 49: ...is discharge Vs is surface flow velocity A is the cross section area under water and k is the coefficient obtained by dividing the average flow velocity by surface flow velocity The recommended method...

Page 50: ...Figure 6 3 with the main channel and side flooding areas Depending on the water level the ratio between the surface velocity at the center of the channel and the average velocity can greatly differ Fo...

Page 51: ...erating Temperature Range 40 85 C 40 185 F without heating or coolers Ingress Protection Rating IP68 Enclosure Dimensions 150mm x 200mm x 250mm 5 9in x 7 9in x 9 8in Characteristics and Performance Da...

Page 52: ...ON HISTORY Revision Date Description 1 12 Oct 2021 Original 2 11 Apr 2022 Added additional information on SNR and calculating discharge Updated to version 2 1 1 of configurator SW and screen shots Upd...

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