LRF-2000P user manual
Contents
1. www ultrasonicscn com 24 3 12 How to get a scale factor for calibration A scale factor is the ratio between the actual flow rate and the indicated value by the flow meter It can be determined by calibration with standard flow calibration equipment You may change the scale factor in menu window M45 The scale factor can be determined by calibration with flow calibration equipment 3 13 How to use the system locker The system locker provides a means of preventing inadvertent configuration changes or totalizer resets When the system is locked menu window browsing can be done without affecting any change but any modifications are prohibited The system can be locked without a password or with a 1 to 4 digit password With a no password locking directly press the ENT key in M47 If the password is forgotten please contact the factory 3 14 How to use 4 20mA current loop output The accuracy of the current loop output is better than 0 1 It can be configured to different mode such as 4 20mA mode 0 20mA etc Mode selection can be made in menu M55 Refer to the next chapter for details on www ultrasonicscn com 25 MSS In order to use the 4 20mA output function you need not only select the mode to be 4 20mA in M55 but also set the flow rate values which correspond to the minimum current 4mA and the maximum current 20mA Enter the two values in M56 and M57 Example A flow rate range is 0 5002. 0 in M44 Problem with transducer installation There is a Zero Point Try to zero the instrument by using M42 and make sure that the flow inside the pipe should be standstill The battery can not work as long as the time period as indicated by M07 Battery should be replaced due to the end of the service life www ultrasonicscn com 50 Newly changed battery does not fit the battery estimating software Customizing the battery with the software should be taken Please contact the factory The battery has not been fully recharged or the recharge has been stopped too many times halfway There is indeed a time difference between the actual working time and the estimated one especially when the terminal voltage is in the range 3 70 and 3 90 volt Please refer to battery voltage for a closer estimated working time 6 Software Upgrade Service We provide free of charge software upgrade services Please contact the factory for any lately developed software or download from our website
3. 3 23 How to use the manual totalizer Use M38 for the manual totalizer Press ENT key to start and stop the totalizer 3 24 How to know how long the battery will last Use M07 to check how long the battery will last Also please refer to 2 1 3 25 How to check the ESN and other minor details Every set of the LRF 2000S flow meter utilizes a unique ESN to identify the www ultrasonicscn com B12 meter The ESN is an 8 digit number that provides the information of version and manufacturing date The user can also employ the ESN for instrumentation management The ESN is displayed in window M61 Other details about the instrument are the total working hours displayed in window M 1 and the total power on times displayed in window M 4 3 26 How to use the data logger for scheduled output Use menu window 51 to setup the time of scheduled output including start time time interval and how many times of output Then use menu window 50 to turn on data logger and select the items you want to output 3 27 How to output analogue voltage signal Parallel a 250Q resistance to the terminal of the Current loop output No 21 22 then you can change the 4 20mA output to analogue voltage output 3 28 How to adjust the LCD display You may use menu window 70 to setup the LCD display backlight and menu window 71to adjust contrast it www ultrasonicscn com ae pee 3 29 How to use RS232 RS485 Use menu window 62 to set up RS232 RS
4. meter will work properly even in demanding industrial environments such as those with power frequency transverter working nearby Other outstanding features the signal receiving circuits feature self adapting performance so as to ensure that the user can easily operate the instrument without any adjustment the built in rechargeable Ni H battery can work continuously for about 20 www ultrasonicscn com 2 hours without recharging The advanced circuit design the integration of the latest semiconductors the user friendly software interface both in English and Chinese languages all these features combine to make the LRF 2000P ultrasonic flow meter the best and the biggest seller on the Chinese market Moreover it is gaining more and more recognition on the international flow meter market 1 2 Features High accuracy Linearity 0 5 repeatability 0 2 accuracy up to 1 Non contacting measuring The ultrasonic flow meter will be adsorbed on the outside of pipe and then finish the measuring Non intrusive clamp on transducer no pressure drop no pipe disturbance Wide measuring range Several types transducer for selection pipe size from DN15mm to DN6000mm Chinese amp English menu Chinese amp English display easy to operate Large capacity battery Built in rechargeable Ni MH rechargeable battery provide over 20 hours of continuous operation Built in printer Built in mini thermal printer with ins
5. than 20 it means there are certain kinds www ultrasonicscn com 19 of problems with the transducer installation 2 8 4 Time Ratio between the Measured Total Transit Time and the Calculated Time This ratio would be used to check the transducer installation If the pipe parameters are entered correctly and the transducers are installed properly the value for this ratio should be in the range of 100 3 If this range is exceeded the user should check If the pipe parameters are correctly entered If the actual spacing of the transducers is right and the same as what the window M25 shows If the transducers are installed properly in the right directions If the mounting location is good and if the pipe has changed shape or if there is too much fouling inside the pipes Other poor condition 2 8 5 Inspection Item after Installation Check out the tube wall parameter and confirm whether each item is corrected take record of the flow meter sequence number and other parameter as well as the signal strength together kept for inspection Check out the M 90 judge whether the signal strength and Q value is over 70 Check out the M 91 judge whether the signal transit ratio between 97 103 Check out the M 60 judge whether the date and time is correct If not please adjust it to correct otherwise date function power on and power off function cannot work regularly For fixed application situation pressing M26 the fir
6. 485 All the devices connected with flow meter should have matched serial configuration The following parameters can be configured Baud rate 300 to 19200 bps parity data bits always is 8 stop bits 1 3 30 How to use automatic amending function for offline compensation Use menu window 83 turn on or turn off this function When the function is enabled the flow meter will estimate the average flow uncounted or lost during the offline session and add the result to the totalizer This function is not recommended The user should manage to avoid the offline time to keep precision of the measurement result 3 31 How to use batch controller Please do the following to use the batch controller 1 Go to menu window 80 to select the trig signal 2 Go to menu window 78 OCT output or 79 relay output select 8 Batch Control 3 Use menu window 81 to set the flow batch value dose 3 32 How to adjust the analogue output www ultrasonicscn com 233 We have adjusted every set of meter before delivery Unless you find the current indicated in menu 58 is different with the actual current output please do not do this operation Press keys MENU W 0 _ use the password 4213068 to enter the window Notice the window will close after power off and the password will become invalid then Press keys MENU W 1 to adjust the 4mA current output use precision ammeter to measure the output current at the same t
7. AD 7einines LONnNGRUN LRF 2000P Portable Ultrasonic Flow Meter User Manual LONGRUN INDUSTRIAL INSTRUMENT CO LTD www ultrasonicscn com 2 Content le trod UCT on eeaeee AAAA A ucdencdesccedccddecddcescdenceusesusssuissusssus suas tnastaaeeianye 1 SEL oto C6 er 1 1 2 Features 13 Out SIMS Vile Wises cs is OEE ESATA ES SEES See U SECTS 2 1 4 Principle of Measurement SES Typica Appi at ONS a A RERESET EEES 5 1 6 Optional Transducers REE 0 yao cle Colo TE EE een eee ee TERT Ee TEE TERTE CEE SE TCE ETE RTE RTE TERT AT 6 2 Starting Measure merit iiiiincniscscccauaaaanananaiaiacaisaisaisncanaiavesvesvesnnsnsnnsnnsnnsvaceveenceseecceeess 9 Sal Opi GI ONC E EEEE iek 9 2 2 Built in Battery 2 SSPOWEL Dis aaan aLL 555s SS 10 2 4 Keypad RSet Ss GNC ONT Bure Tie Para Meters eee rererere ereere a eose aeea ER EEEE EEE TEETER ESE 11 2 6 Transducers Mounting Allocation 2 2 Transducers Anstal lati On eA A 15 3 6 How to open or shut the totaliZers 0 0 ccc ese eseeeeesecsececaeeaetsesaeeaesaesaessessesaeseeaeeaeenes 22 3x7 How tore Seti thie 1otali zens eeaeee eraoo AAAA EASES SE SERERE 22 www ultrasonicscn com 3 3 8 How to restore the flow meter with default setups cece cesses ceeeeeteetetneteeaeeaes 22 3 9 How 10 se the damper vieira naaa aana aAa a ia nananana nananana nanana aR ESES 22 3 10 How touse the zero Cutoft Mun Ct On s
8. SN and other minor details cccccscesesseseseeseseeseseeesseeessenesseneees 30 3 26 How to use the data logger for scheduled output ec eeeeeeee eee cee teste tnetneeeeaeeaes 31 3 27 How to output analogue voltage signal oo eee eseeeeeeeeseeeeeeeeaeesesaeeaetaeeaeeeeneeneenes 31 3 28 How to adjust the LCD display sossesseeseeseeeesosccscescssccacescesseseescescesseseesaeseeseeneesensess 31 3 29 How to Use RS232 RSAB5 i EAAS i Eara aanraai 32 3 30 How to use automatic amending function for offline compensation ccccceeeeeees 32 3251 Howto ise DatCh Comtronletssc iscc2cccceccecccceccocccccceusene sceccscccoccccerescesesedsdzssaszssasansasanaaeevatiten 32 3 32 How to adjust the analogue output icccsccsscsscsssssssssseseesaecarteteiaesseuaesseusesesscsscsussisssssaseassass 32 3 33 How ta solidity ithe parameters citi a eeseeseeseeseeseeseeseeseesenennannaiys 33 3 34 How to enter the parameters of user type transducer eee eee eseceeceeteetseeseeseeaeeaes 33 3 35 How to use the circular display Tun ction 20 ccccccseccoscensevcesseveeseossasssstestessensssssssensene sees 34 3 36 How to enter into the linearity correcting How to enter into the data 0 0 ee 34 www ultrasonicscn com 4 3 37 How to save restore frequently used pipe parameters cece eee eeeeeeeeeeeeeneeeenes 36 Menu Window Detatls siaii aea ea A EES 37 4 1 Menu Windows Arrangement osossssisessssssisessssiitisiii iiiaae reri
9. at least be great than 50 for normal operations Displays the Time Ratio between the Measured Total Transit Time and the Calculated time If the pipe parameters are entered correctly and the transducers are properly installed the ratio value should be in the range of 10043 Otherwise the entered parameters and the transducer installation should be checked Displays the estimated fluid sound velocity If this value has an obvious difference with the actual fluid sound speed pipe parameters entered and the transducer installation should be checked again Displays total transit time and delta time transit time difference Displays the Reynolds number and the pipe factor used by the flow rate program Display the positive and negative energy totalizers Entry to start the loop displaying windows from M00 M08 to M90 M95 The loop displaying will stop when any key pressed Command for the thermal printer to advance 5 lines of paper Command to record the pipe parameters entered by the user The printing data can be directed either to the internal serial bus or to RS 232C serial interface Command to print the diagnostic information The printing data can be directed either to internal serial bus or to RS 232C serial interface Command to copy the current display The printing data can be directed either to the internal serial bus or to RS 232C serial interface Browse the 32 recorded instrument power on a
10. default option is that the parameters will be loaded If this switch is not turned on the system will try to use the parameters in the system RAM if these parameters are ok or the system will load the parameters in flash memory Function to store the current parameters into the flash memory Entry to store to or restore from the internal Flash memory as many as 9 different pipe parameter configurations Select YES or NO for the instrument to determine whether or not to hold or to keep the last correct value when poor signal condition occurs YES is the default setup Pipe empty setup Enter a value ranging from 00 to 99 0 is the default value The flow rate will be set to 0 if the signal strength is below the entered value Window for selecting unit system Default value is Metric The change from English to Metric or vice versa will not affect the unit for totalizers Window for selecting flow rate that will be used by the instrument afterward Flow rate can be in Cubic meter short for m3 Liter L USA gallon GAL Imperial Gallon AGL Million USA gallon MGL Cubic feet CF Oil barrel OB NIA a A UU N m e gt Imperial liquid barrel IB www ultrasonicscn com 41 The flow unit in terms of time can be per day per hour per minute or per second So there are 32 different flow rate units in total for selection Window for selecting the totaliziers workin
11. displayed value is NEGATIVE the direction will be from the B transducers to the A transducers 3 3 How to change between units systems Use menu window M30 for the selection of unit system in English or Metric system 3 4 How to select a required flow rate unit Use menu window M31 to select the flow unit first and then the timing unit 3 5 How to use the totalizer multiplier Use window M33 to select a proper totalizer Make sure that the totalizer pulse is appropriately speeded It should not be too fast and neither too slow A speed of producing a pulse in several seconds or minutes is preferable If the totalizer multiplier is too small there can be a loss of accumulation pulse because the output device can output only one pulse in a measurement period SO00milliseconds www ultrasonicscn com 22 If the totalizer multiplier is too large the output pulse will be too fewer for the devices that are connected with the instrument for a quicker response 3 6 How to open or shut the totalizers Use M34 M35 and M36 to turn on or turn off the POS NEG or NET totalizer respectively 3 7 How to reset the totalizers Use M37 to reset the proper totalizer 3 8 How to restore the flow meter with default setups Use M37 when the selection message is displayed Press the dot key first and the message Master Erase will display then press the backspace key lt The master erase step will erase all the parameters enter
12. e difference in the transit time measured is directly and exactly related to the velocity of the liquid in the pipe as shown in the following figure Down stream transducer oes _ MD AT sin 20 ey inin spacing leran Where 0 is the include angle to the flow direction M is the travel times of the ultrasonic beam D is the pipe diameter Tup is the time for the beam from upstream transducer to the downstream one Tdown is the time for the beam from downstream transducer to the upstream one AT Tup Tdown www ultrasonicscn com 5 1 5 Typical Applications The LRF 2000P flow meter can be virtually applied to a wide range of measurements The measured pipe ranges 15 6000mm Because the instrument and transducers are non contacting and have no moving parts the flow meter can not be affected by system pressure fouling or wear Standard transducers are rated to 110 C For further information please consult the manufacturer for assistance Water industrial sewage 10 Operation and maintenance of sea water ship Acid amp Alkali Liquid 11 Monitoring and management of water saving Various oil 12 Papermaking and pulping Feed water and drainage 13 Leak detection Detection of water 14 Heating resources Petrochemical 15 Manufacturing of pump boiler cooling tower Food and pharmaceutical 16 Management of flow and heat industry control network system Power plant 17 Patrol traci
13. ed by the user and setup the instrument with default values except instrument factor and network identification number parameter 3 9 How to use the damper www ultrasonicscn com 23 The damper acts as a filter for a stable reading If 0 is entered in window M40 that means there is no damping A bigger number brings a more stable effect But bigger damper numbers will prevent the instrument from acting quickly Numbers 0 to 30 are commonly used for the damper value Default value is 10 seconds 3 10 How to use the zero cutoff function The number displayed in window M41 is called the lower flow rate cut off value The flow meter will replace these flow rate values that are absolutely less than the low cutoff value with 0 This means the flow meter will avoid any invalid accumulation when the actual flow is below the zero cutoff value Generally the default value is 0 03m s The low cutoff value does not affect the flow measurement when the actual flow is absolutely greater than the low cutoff value 3 11 How to setup a zero point There exists a Zero Point with certain installation which means the flow meter will display a non zero value when the flow is absolutely stopped In this case setting a zero point with the function in window M42 will bring a more accurate measurement result Make sure that there is no liquid running inside the pipe and then run the function in window M42 by pressing the ENT key
14. external interference is strong Suggest customers use special cable because it has small signal impairment and high anti interference ability so that guarantees flow meter long term and reliable work Steps to the installation of the transducers Locate an optimum position where the straight pipe length is sufficient and where pipes are in a favorable condition e g newer pipes with no rust and ease of operation Clean any dust and rust For a better result polishing the pipe with a sander is strongly recommended Apply adequate coupler to the spot where the transducers are to be installed and leave no gap between the pipe surface and the transducers Extra care should be taken to avoid any sand or dust particles left between the pipe outer surface and the transducers www ultrasonicscn com 16 To avoid gas bubbles inside the upper part of the pipe the transducers should be installed horizontally by the side of the pipe 2 7 1 Transducers Spacing The spacing value shown on menu window M25 refers to the distance of inner spacing between the two transducers The actual transducers spacing should be as close as possible to the spacing value 2 7 2 V method Installation V method installation is the most widely mode for daily measurement with pipe inner diameters ranging from 20 mm to 300 mm It is also called reflective mode Transducer spacing lt gt 2 7 3 Z method Installation Z method is commonl
15. g or selections Key MENU is the key for the direct menu window jump over Whenever the user wants to proceed to a certain menu window the user can press this key followed by 2 digit numbers The MENU key is shortened as the M key afterward when referring to the menu windows The ON key is for the power on The OFF key is for the power off 2 5 Steps to Configure the Parameters The following parameters need to be configured for a proper measurement www ultrasonicscn com 12 Pipe outer diameter Pipe wall thickness Pipe materials for non standard pipe materials the sound speed for the material must be configured too Standard pipe materials and standard liquids refer to those with the sound parameters that have already been programmed into software of the flow meter therefore there is no need to configure them Liner material and its sound speed and thickness if there is any liner Liquid type for non standard liquids the sound speed of the liquid is also needed Transducer type adapted to the flow meter Generally the Standard M1 clamp on transducers will be the selected option Transducer mounting methods the V method or Z method is the common option Default settings For standard pipe materials and standard liquids the following detailed step by step setup is recommended 1 Press keys MENU 1 1 toenter M11 window to input the digits for the pipe outer diameter and then press ENT key 2 P
16. g unit Select totalizer multiplier The multiplier ranges from 0 001 to 10000 Turn on or turn off the NET totalizer Turn on or turn off the POS totalizer Turn on or turn off the NEG totalizer 1 Totalizer reset 2 Restore the instrument to the default parameters as the manufacturer did by pressing the dot key followed by the backspace key Take care or make note on the parameters before doing the restoration Press a key to run or to stop totalizer for easier calibration Interface language selection in Chinese and English This selection could also be changed automatically by the system if English LCD display is used as the display device Setup for local segmental LCD display Enter 0 or 1 for the non auto scan mode Enter 2 39 for the auto scan mode in whichmode the display will automatically scan displaying from 00 to the entered number of the local segmental LCD display Flow rate damper for a stable value The input range is 0 to 999 seconds 0 means there is no damping Default value is 10 seconds Lower flow rate cut off to avoid invalid accumulation Zero point setup under the condition when there is no liquid running inside the pipe www ultrasonicscn com 42 Clear the zero point set by the user and restore the zero point set by the manufacturer Set up a manual flow bias Generally this value should be 0 Scale factor for the instrument The default
17. ime use A V to adjust the digital on the flow meter until the ammeter indicate 4 00 Then press ENT to enter the window of adjusting the 20mA output When finished adjusting you have to use menu window 26 to store the result into the flash memory so that it will be solidified and will not be lost even the reserve battery removed 3 33 How to solidify the parameters There are three kinds of parameters for the new generation LRF TUC 2000 1 Current parameters the parameters are stored in the RAM They will be lost when one cut the power or remove the reserve battery 2 Solidified parameters you may use menu window 26 to store the parameters in the Flash memory and they will not be lost even power off This menu window is also a switch for the parameters in flash memory to be loaded when power is turned on The default option is that the parameters will be loaded So if the parameters are very stable you may need this option 3 User frequently used parameters you can use menu window 27 to store or restore from the internal Flash memory as many as 9 different pipe parameter configurations 3 34 How to enter the parameters of user type transducer If a user type transducer is selected in menu window 23 you need proceed www ultrasonicscn com 34 to enter additional 4 user type wedge parameters that describe the user transducers If the PI type transducer is selected you need enter additional 4 PI type transducer parame
18. isie eee roog reeeo r arnesa E keresere 23 ILL How to setup 8 Zero Polni seesseerrosssses is Sasss esssSESSesed ddid d ire 23 3 12 How to get a scale factor for calibration s ssssssssssesrsrsrsresrsrsrerrsrersrerrsrersrsrnsrsreerereret 24 SAS How te wise thesystem locker cccceccccccccceiskiscisciskinstensansansansansanosnosnesnosnesnosnosnosnesnonnesceseeies 24 3 14 How to use 4 20mA current loop Output oo ee eee cence cece tee eaetaetaeeaetaesaeeaetaeeneenes 24 31S How to tise the Frequency Output S cenoseeenieresie iee AAE AAAA Er ek EV ERUEN VE SISS 26 3 16 How to use the Totalizer Pulse Output sssssssssesrsrsseserrsrsrsrrsrsrsrerrsrsrsrerrsrerstnrnsrerserereret 27 3 17 How ta produce an alatm signal s sisien reisas iar sanea iasaaatanana aa tanana rantana taaa aaa 27 3 18 How touse they builtin ByZZe E oreore ereen ar eere s raeo a aeS rA Er rO RONSTAN 29 319 Howto se the OCT OUip t seene Eoee esd didi ddiddan Apna I eee eeu 29 3 20 How to modify the built in calendar s sssssssesssseresesesrsrsreresrersrerrsrersrerrsrerstrersrsrerereret 29 32L How to view the Date TotalizerS sn EEN NEA AAAA EE EE TEF EEEE 30 3 22 How Ube the Working TIMET nan aE E EE aa AEAEE IEAI EN 30 323 How totmseithesmantial totali Zen 2 iccccscccccccceccoccncocescyssucesscecesssecsasesasacsagscsacansacsesaeaesanatan 30 3 24 How to know how long the battery will last 00 eee eeeeeeeeeeeeeeeeetaetaetaetaeeaeeaeenes 30 3 25 How to check the E
19. ltrasonicscn com 29 5 Select item 6 Alarm 1 in M78 6 Select item 6 Alarm 1 in M79 3 18 How to use the built in Buzzer The built in buzzer is user configurable It can be used as an alarm Use M77 for setups 3 19 How to use the OCT output The OCT output is user configurable which can be performed by selecting the proper input source such as pulse output Use M78 for the setups Please make sure that the Frequency Output shares the OCT The OCT output shares pins with the RS 232C interface and the terminal is at Pin 1 and 8 3 20 How to modify the built in calendar No modification on the built in calendar will be needed in most cases The calendar runs on insignificant amount of power supply Modification will be required only in such cases as when the battery is totally consumed or when the changing of the battery takes a long time Press the ENT key under M60 for Modification Use the dot key to skip over these digits that need no modification www ultrasonicscn com 30 3 21 How to view the Date Totalizers Use M82 to view the date totalizers that are comprised of a daily totalizer a monthly totalizer and a yearly totalizer 3 22 How to use the Working Timer Use the working timer to check the time that has passed with a certain kind of operation For example use it as a timer to show how long a fully charged battery will last Under M72 press ENT key and then select YES to reset the timer
20. lystryol 6 Polystyrene 7 Polyester 8 Polyethylene 9 Ebonite 10 Teflon Window for entering the liner material speed only for non standard liner materials Window for entering the liner thickness if there is a liner Window for entering the ABS thickness of the inside wall of the pipe Window for selecting fluid type For standard liquids that the user need not know the liquid speed include 0 Water 1 Sea Water 2 Kerosene 3 Gasoline 4 Fuel oil 5 Crude Oil 6 Propane at 45C 7 Butane at0C 8 Other liquids 9 Diesel Oil 10 Caster Oil 11 Peanut Oil 12 90 Gasoline 13 93 Gasoline 14 Alcohol 15 Hot water at 125C Window for entering the fluid sonic velocity only for non standard liquids Window for entering the viscosity of the non standard liquids Window for selecting the proper transducers There are 20 different types of transducers for selection If the user type transducer is selected system will prompt anther 4 user type wedge parameters to be input If the z type transducer is selected the system needs also another 4r type transducer parameters Window for selecting the transducer mounting methods Four methods can be selected www ultrasonicscn com 40 0 V method 1 Z method 2 N method 3 W method Display the transducer mounting spacing A switch for the parameters in flash memory will be loaded when power is turned on The
21. m h Just enter 0 in M56 and 500 in M57 Example B flow rate range is 500 0 1000m h If flow direction is not an issue for you you may select 20 4 20mA mode in M55 Then enter 500 in M56 and 1000 in M57 If flow direction is an issue you may select 0 4 20mA mode in M55 This means that the current loop will output 0 4mA when flow rate is negative and 4 20mA when flow rate is positive Enter 500 in M56 and 1000 in M57 You may need to calibrate and test the current loop output before using it Just go to menu M58 and do the following First connect an ammeter to the current loop output Press MENU 5 8 then ENT to enter into menu M58 Use A and W to display OmA 4mA 8mA 16mA 20mA orderly record the corresponding reading on the ammeter Calculate the differences between the readings and the selected ones For instance when 4mA is selected the actual output current shown on the ammeter is 4 01mA Then the difference is 0 01mA www ultrasonicscn com 26 If the differences are not within tolerance calibrate the current loop The present current loop output is displayed in Window M59 It changes along with flow rate change 3 15 How to use the Frequency Output There is a Frequency Output in all LRF 2000 series flow meters This frequency output signal which represents the flow rate is intended to connect with other instruments The Frequency Output is totally user configurable Generally four para
22. meters should be configured for the setups Enter the lower flow rate value in window M68 and the higher flow rate value in window M69 Enter the frequency range in window M67 For example assume that the flow rate varies in a range 0m7 h to 3000m7 h and an output signal is at a maximum frequency of 1000Hz the minimum of 200Hz is going to be required for other instrumentation The user should enter 0 in M68 and 3000 in M69 and enter 200 and 1000 in window M67 Please note that the user has to make the selection with OCT setups in window M78 www ultrasonicscn com 97 3 16 How to use the Totalizer Pulse Output The totalizer output will produce a pulse output with every unit flow of the totalizer The totalizer pulse output can only be realized by mapping the pulse output to the OCT or BUZZER hardware devices For example assume that the POS totalizer pulse output is needed and every pulse should represent 0 1cubic meter of liquid flow the pulse output will be mapped to the internal Buzzer so that with every 0 1 cubic meter of flow the BUZZER will beep for a while The following setups should be taken performed Select the unit Cubic Meter under window M32 Select the Multiplier as 2 X0 1 under window M33 Select the output option 9 POS INT Pulse under window M77 INT stands for totalized 3 17 How to produce an alarm signal There are 2 types of hardware alarm signals that are available with this i
23. nd power off date and time with the flow rate at the time of power on and off Displays the total working time of the instrument www ultrasonicscn com 46 Displays the last power off date and time Displays the last power off flow rate Displays how many times of instrument has been powered on A scientific calculator for the convenience of field working All the values are in single accuracy Enter a number as the velocity of the liquid for the system to determine if another kind of liquid is running Displays total flow for this month only for the time past Displays total flow for this year only for the time past Not working total time in seconds It include the time when power off if the back up battery is applied Entry to solidify the zero point Password protected M 5 Setup the Q value threshold If Q is below this threshold flow rate will be set to 0 M 8 The maximum flow rates for today and this month Serial port tester with CMM command output for very second Entry to hardware adjusting windows only for the manufacturer 5 Troubleshooting 5 1 Power on Error Displays and Counter Measures The LRF 2000P ultrasonic flow meter provides an automatic power on diagnosis for the hardware problems When any message with the power on in the following table displays counter measures should be taken Error message causes Counter measures ROM Testing Problem
24. ng the user will configure the instrument with very little key pressing since the interface allows the user to go to the desired operation directly without any extra steps The following tips will facilitate the operation of this instrument 1 When the window display is between MOO to M09 press a number key x the user will go directly to the MOx window For example if the current window displays M01 press 7 and the user will go to M07 2 When the window display is under M00 to M09 press the ENT key and the user will go to M90 press ENT key to return Press the dot key to go to M11 When the window display is under M25 press ENT key to go to MO1 www ultrasonicscn com 14 2 6 Transducers Mounting Allocation The first step in the installation process is the selection of an optimum location in order to obtain a more accurate measurement For this to be completed effectively a basic knowledge about the piping and its plumbing system would be advisable Principles to selection of an optimum location 1 Choose the straight pipe section full of liquid e g the vertical segment of the pipe or the horizontal segment which is full of liquid 2 Make sure that the temperature on the location does not exceed the range for the transducers 3 Take the pipes fouling into consideration Select a straight length of a pipe with no fouling if the condition is not satisfying consider the fouling thickness as part of the line
25. ng and collection of flow Metallurgical mines 18 Measurement and balance of heat www ultrasonicscn com 1 6 Optional Transducers Optional Transducers Description Measuring range Temperature Small size transducer Magnetic DN15 100mm 40 110 C Medium size transducer Magnetic DNS50 1000mm 40 110 C Large size transducer Magnetic DN300 6000mm 40 110 C High temperature small size transducer High temperature medium size transducer 1 7 Optional Accessories DN15 100mm DNS50 1000mm 40 160 C 40 160 C Optional ae M i Ee Model Description PeR Accuracy Accessories range Ultrasonic measure tube wall Lo 1 H 0 1mm H thickness TT100 thickness i is measuring 225 0mm f meter increase accuracy thickness Suit for long distance lengthen 10mx2 conneeuen cable between pipe and main unit www ultrasonicscn com Suit for fixing of Lengthen Fane transducer stretcher over 1000mm pipe Thermal 30m print paper 1 8 Basic Technical Data Items Spec Main Unit 2 line x 20 character LCD with backlight Working temperature 20 60 C Mini thermal printer with 24 line character output 4x4 2 pushbutton keypad RS485 serial port can download the newest software upgrading on our company s website Transducers TS 1 small size transducer magne
26. nstrument One is the Buzzer and the other is the OCT output Both for the Buzzer and OCT output the triggering sources of the event include the following There is no receiving signal www ultrasonicscn com 28 There is poor signal received The flow meter is not in normal measurement modes Reverse flow Overflow occurs at the analogue output by 100 or more Overflow occurs at the frequency output by 120 or more 7 The flow rate is out of the specified range which is configured in windows M73 and M74 for Alarm 1 and in windows M75 and M76 for Alarm 2 Example A assume we need the Buzzer to start beeping when the flow meter is not ready in normal measurement Switch to M77 select item 2 Abnormal Measurement State Example B assume we need the Buzzer to start beeping when the flow rate is less than 300 m h and greater than 1000m h The following setup steps would be recommended 1 Enter flow rate lower limit 300 in M73 for 1 alarm 2 Enter flow rate upper limit 1000 in M74 for 1 alarm 3 Select item 6 Alarm 1 in M77 Example C assume we need the OCT output to activate when flow rate exceeds 100 500mV h and the relay output to activate when flow rate exceeds 600 1000m3 h The following setup steps would be recommended 1 Enter flow rate lower limit 100 in M73 2 Enter flow rate upper limit 500 in M74 3 Enter flow rate lower limit 600 in M75 4 Enter flow rate lower limit 1000 in M76 www u
27. o polish the outer surface of the pipe and apply more coupler to increase the signal strength 3 Adjust the transducers both vertically and horizontally while checking the varying signal strength stop at the highest position and then check the transducers spacing to make sure the transducers spacing is the same as what the M25 shows 2 8 2 Signal Quality Signal quality is indicated as the Q value in the instrument A higher Q value would mean a higher Signal and Noise Ratio short for SNR and accordingly a higher degree of accuracy would be achieved Under normal pipe condition the Q value is in the range 60 0 90 0 the higher the better Causes for a lower Q value could be Interference of other instruments and devices such as a powerful transverter working nearby Try to relocate the flow meter to a new place where the interference can be reduced Bad sonic coupling for the transducers with the pipe Try to apply more coupler or clean the surface etc Pipes are difficult to be measured Relocation is recommended 2 8 3 Total Transit Time and Delta Time The numbers displayed on menu window M93 are called total transit time and delta time respectively They are the primitive data for the instrument to calculate the flow rate inside the pipe So the flow rate indication will vary accordingly with the total time and delta time The total transit time should remain stable or vary little If the delta time fluctuates more
28. oard flashes shows that it is charging when the red light is changed into green it means charging is finished The back up battery uses CR2032 button battery Its functions are first to keep the data not miss second to keep the running of real time clock If there is no battery when the external power supply is cut the real time clock will not run and the data of time accumulation will lost Even though the external supply is cut the reserve battery can keep the data and clock running for about 100 thousand hours The voltage of back up battery is 3V When the battery is depleted users can change it by themselves www ultrasonicscn com 10 2 3 Power on Press the ON key to switch on the instrument and press the OFF to turn off the power Once the flow meter is switched on it will run a self diagnostic program checking first the hardware and then the software integrity If there is any abnormality corresponding error messages will display Generally there should be no display of error messages and the flow meter will go to the most commonly used Menu Window Number 01 short for M01 to display the Velocity Flow Rate Positive Totalizer Signal Strength and Signal Quality based on the pipe parameters configured last time by the user or by the initial program The flow measurement program always operates in the background of the user interface This means the flow measurement will keep on running regardless of an
29. of correction factor we add two points on the basis of the above five points 0 m h 1 0 and 100000 m h 1 0 0 m h 1 0 is called the minimum flow of the amendment point this set of data is used to facilitate to generated a appropriate correction factor when Instrumented show flow under 1 02 m h 100000 m h 1 0 is called the maximum flow of the amendment point this set of data is used to facilitate to generated a appropriate correction factor when Instrumented show flow above 50 56 m h So that we get the following data sets from small to large 0 0998 gt 5 505 gt 10 85 19 78 51 23 100000 gt 1 02 0 93 0 95 1 03 0 99 SNe The total is seven sets of data The next step is to put seven sets of data entered into the Instrument Pay attention to the input order in accordance with from small to large www ultrasonicscn com 36 To enter the menu M48 then input the data set number 7 to be followed in the above seven sets of data we revised the setup of a multi segment linearity correcting If you need to cancel linearity correcting simply enter 0 in the menu M48 Decommissioned linearity correcting you just need to enter in the menu M48 data points in this case is 7 Noted before the calibration of the instrument you must first close the linearity correcting function If under the condition that the linearity correcting function has not cl
30. osed the calibration data sets arising from the amendment must be dealing with the reverse curve of the data following the original amendment then input to the Instrument Reverse amendment is very complicated and should be avoided 3 37 How to save restore frequently used pipe parameters You can use menu window 27 to store or restore from the internal Flash memory as many as 9 different pipe parameter configurations 4 Menu Window Details 4 1 Menu Windows Arrangement MO00 MO09 windows for the display of the flow rate velocity date time totalizer battery voltage and estimated working hours for the battery M10 M29_ windows for entering the pipe parameter M30 M38 windows for flow rate unit selections and totalizer unit selections M40 M49 windows for response time zeroing calibration and modification password setup M50 M89 windows for the printer output RS 485 output OCT output current output frequency signal output sound alarms and date totalizer etc M90 M94 are diagnostic windows for a more accurate measurement M97 M99 are not windows but commands for the outputting of display copying and pipe parameter setups M 0 M 9 are windows for some additional functions including a scientific calculator viewer on records such as total working hours turn on and turn off times dates and times when the flow meter has been turned on or turned off There are menu windows which have no functions or functions
31. r flow rate value that will trigger the 1 Alarm www ultrasonicscn com 44 Enter the lower flow rate value that will trigger the 2 Alarm Enter the higher flow rate value that will trigger the 2 Alarm Buzzer setup If a proper input source is selected the buzzer will beep when the trigger event occurs OCT Open Collect Transistor Output setup By selecting a proper input source the OCT hardware will close when the trigger event occurs Relay or OCT2 setup By selecting a proper input source the hardware will close when the trigger event occurs Note in order to make the user interface compatible with the future LRF 2000 the name RELAY was used other than OCT2 But in fact it is an OCT output Signal selection for the built in batch controller The built in batch controller Date totalizer by day by month and by year Automatic total flow correction switch Energy unit select Temperature select Specific heat select Energy totalizer switch Energy multiplier 1 display the temperature difference 2 the window to set the lowest temperature difference Display signal strength signal quality Q value Signal strength is presented by 00 0 to 99 9 the bigger the value the bigger the signal strength will be and more reliable readings www ultrasonicscn com 45 will be made Q value is presented by 00 to 99 the bigger the better It should
32. r for a better result 4 Select the pipe whose material is homogeneous compact and easy to transmit ultrasonic wave Steps to the installation of the transducers 1 Locate an optimum position where the straight pipe length is sufficient and where pipes are in a favorable condition e g newer pipes with no rust and easy to operate 2 Clean any dust and rust For a better result polishing the pipe with a sander is strongly recommended 3 Apply adequate coupler to the spot where the transducers are to be installed and leave no space between the pipe surface and the transducers Note 1 Extra care should be taken to avoid any sand or dust particles left between the pipe outer surface and the transducers Eeseca N 20D 5D rS jet 20D 5D L up L dn l ie e aS Li i 30D 5D 2 7 Transducers Installation LRF 2000P uses different colors to distinguish the upstream and downstream transducers Upstream red downstream blue The wiring of transducers uses customized twisted pair it is determined by the sending and receiving circuits which employ balanced lower voltage multi pulse igniting circuit the advantage of twisted pair is to increase the anti interference ability magnificently If we use the single shielded HF cable or double shielded cable the performance of flow meter may degrade and can not measure when
33. ress key W to enter M12 window to input the digits for the pipe outer diameter and then press ENT key 3 Press key W to enter M14 window and press ENT key to enter the option selection mode Use keys A and W to scroll up and down to the intended pipe material and then press ENT key 4 Press key W to enter M16 window press ENT key to enter the option selection mode use keys A and W to scroll up and down to the liner material and then press ENT key Select No Liner if there is no liner www ultrasonicscn com 13 5 Press key W to enter M20 window press ENT key to enter the option selection mode use keys A and W to scroll up and down to the proper liquid and then press ENT key 6 Press key W to enter M23 window press ENT key to enter the option selection mode use keys A and W to scroll up and down to the proper transducer type and then press ENT key 7 Press key W to enter M24 window press ENT key to enter the option selection mode use keys A and W to scroll up and down to the proper transducer mounting method and then press ENT key 8 Press key W to enter M25 window to check up the installation space then install the transducers on the pipe and then press ENT key to go to M01 for the results The first time users may need some time to get familiar with the operation However the user friendly interface of the instrument makes the operation quite easy and simple Before lo
34. rinarerarinaa raii ikiii 37 4 1 Menu Window DOSa AAA 37 5 Troubleshooting AT 5 1 Power on Error Displays and Counter Measures AT 5 2 Error Code and ounter MEasures sss aeaaeae aaea eaaa aaia iaaa EE EEEREN 47 5 3 Other Problems and Solutions 49 1 Introduction 1 1 Preface Welcome to the LRF 2000P Version 13 0 ultrasonic flow meter that has been manufactured with patent technologies and is equipped with more functions and advanced performance than our previous versions The Version 13 0 series ultrasonic flow meter has been upgraded based on the Version 10 0 series ultrasonic flow meter which is still the main product line of the company The new Version 13 0 retains most of the excellent features and functions of the previous versions the pulse measurement technology the ultrasonic igniting and the small signal receiving circuits etc The main improvements are made on the isolation power supply and on the isolation RS485 serial port The LRF 2000P flow meter incorporates the latest ICs manufactured from the famous semiconductor manufacturers like Philips Maxim TI Winbond and Xilinx The hardware features the ease of operation high accuracy and outstanding reliability while the software provides a very user friendly interface and much more functions It employs a patent balanced lower voltage multi pulse igniting circuit which increases the anti interference ability magnificently so that the flow
35. s ENT for modification Use the dot key to skip the digits that need no adjusting Display Version information and Electronic Serial Number ESN that are unique for each LRF 2000 series flow meter The users may employ the ESN for instrumentation management RS 232 RS 485 setup Baud rate can be 300 to 19200 bps Communication protocol selection Default is for protocols which have ASCII format such as MODBUS ASCII Meter BUS Fuji Extended Protocol The other select is for MODBUS_RTU AI3 value range inputs two values which are presented by the 4mA and 20mA current should be input AI4 value range inputs AI5 value range inputs Input the frequency range for the frequency output The biggest range is 0Hz 9999Hz Default value is 0 1000 Hz Enter a flow rate value that corresponds to lower frequency Enter a flow Rate value that corresponds to higher frequency LCD display backlight control The entered value indicates how many seconds the backlight will be on with every key pressing LCD contrast control The LCD will become darker or brighter when a value is entered Working timer It can be cleared by pressing ENT key and then select YES Enter Lower Flow Rate value that will trigger the 1 Alarm There are two virtual alarms in the system By virtual we mean that the user must redirect the output of the alarms by setup the output hardware in M78 and M77 Enter the highe
36. st item can backup the current input parameter which make sure the parameter storage when powered off or battery running out www ultrasonicscn com 20 3 How To 3 1 How to judge if the instrument works properly Enter into M08 if R is displayed on the screen the instrument is working properly If E is displayed the current loop output is over ranged Increasing the range setting in M57 will make the E letter disappear If you do not use current loop output you may ignore this error If Q is displayed the frequency output is over ranged Increasing the range setting in M69 will make the Q letter disappear If you do not use frequency output you may ignore this error If an F flashes on that place there could be poor signal received Please refer to the chapters on diagnosis If G is displayed the flow meter is adjusting system gain This is normal as far as it does not last long time If an T is displayed it means that there is no signal detected If J is displayed there is hardware problem Turn off the power then turn on the power again If the problem remains refer to Chapter 5 for diagnosis details www ultrasonicscn com 21 3 2 How to judge the liquid flowing direction Make sure that the instrument works properly Check the flow rate for the indication If the displayed value is POSITIVE the direction of the flow will be from the A transducers to the B transducers if the
37. tant and timing print function also you can print more than 20 kinds of measuring results if you set in advance Built in data logger Uplink over 20 measuring data to computer or internet 1 3 Outside View Front View www ultrasonicscn com 3 Printer LCD Display Folding handlebar Left view RS485 Interface Downstream Transducer 1 4 Principle of Measurement The LRF 2000P ultrasonic flow meter is designed to measure the fluid velocity of liquid within a closed conduit The transducers are a non contacting clamp on www ultrasonicscn com 4 type which will provide benefits of non fouling operation and easy installation The LRF 2000P transit time flow meter utilizes two transducers that function as both ultrasonic transmitters and receivers The transducers are clamped on the outside of a closed pipe at a specific distance from each other The transducers can be mounted in V method where the sound transverses the pipe twice or W method where the sound transverses the pipe four times or in Z method where the transducers are mounted on opposite sides of the pipe and the sound crosses the pipe once This selection of the mounting method depends on pipe and liquid characteristics The flow meter operates by alternately transmitting and receiving a frequency modulated burst of sound energy between the two transducers and measuring the transit time that it takes for sound to travel between the two transducers Th
38. ters that describe the PI type transducers 3 35 How to use the circular display function When entering menu window 95 the circular display function will be started automatically The following windows will be displayed one by one each window will stay for 8 seconds M95 gt gt M00 gt gt M01 gt gt M02 gt gt M02 gt gt M03 gt gt M04 gt gt M05 gt gt M06 gt gt M07 gt gt M08 gt gt M90 gt gt M9 1 gt gt M92 gt gt M93 gt gt M94 gt gt M95 This function allows the user to visit all the important information without any manual action To stop this function simply press a key Or switch to a window other than M95 3 36 How to enter into the linearity correcting How to enter into the data When the product leaved the factory the function is closed The menu can realize almost 12 parts linearity correcting The user can choose from two points to twelve points to execute the linearity correcting according to user actual condition In order to explain the usage method of the menu we suppose that we get the following table data through calibration the meter Reference standard Instrumented show Correction coefficient www ultrasonicscn com 235 equipment flow m h flow m h standard show value 1 02 0 0998 1 02 5 11 5 505 0 93 10 34 10 85 0 95 20 45 19 78 1 03 50 56 51 23 0 99 In order to revised the flow exceed the scope of the above table without mutations
39. the cords 4 Check the coupler improperly 3 Too much fouling 4 The pipe liners are too thick 5 Problem with transducers cords Check the value entered at M66 M67 M68 and Frequ The actual frequency OutputOver for the Frequency Output is out of the range set by the user System RAM 1 Temporary Error problems with RAM Date Time Error RTC M69 and try to enter a larger value on M69 1 power on again www ultrasonicscn com 49 CPU or IRQ 2 contact factory Error 2 Permanent problems ROM Parity with hardware Error Adjusting Gain Instrument is in the progress of adjusting the gain for the signal and the number indicates the progressive steps K Empty pipe No liquid inside pipe Relocate where the pipe Setup error on M29 is full of liquid Enter 0 on M29 5 3 Other Problems and Solutions When the actual flow inside the pipe is not standstill but the instrument displays 0 0000 for the flow rate and R displaying signal strength and the signal quality Q value has a satisfactory value The problems are likely caused by the user who has used the Set Zero function on this non standstill flowing pipe To solve this problem use the Reset Zero function on menu window M43 The displayed flow rate is much lower or much higher than the actual flow rate in the pipe under normal working conditions There is probably an offset value wrongly entered by the user in M44 Enter
40. tic for pipe size DN15 100mm liquid temperature lt 110 C TM 1 medium size transducer magnetic for pipe size DN50 1000mm liquid temperature lt 110 C TL 1 Large size transducer magnetic for pipe size DN300 6000mm liquid temperature lt 110 C Liquid types Water sea water industrial sewage acid and alkali liquid various oils etc liquid which can transmit sound wave Flow velocity range 0 30m s Accuracy www ultrasonicscn com 8 Better than 1 Power Supply Built in rechargeable Ni MH battery for 20 hours operation or AC 220V Power Consumption 1 5W Charging Intelligent charging with AC 220V After charging sufficiently it automatically stop and display green light Weight Net weight 2 5kg main unit Remarks With a high strength carrying case suitable for normal and harsh environment 2 Starting Measurement 2 1 Open and Check Please check whether the spare parts are according with packing list before installation 2 2 Built in Battery The instrument can operate with the built in Ni MH chargeable battery which will last about 20 hours of continuous operation when fully recharged The charging uses intelligent charging method users can insert one end of the supply line into the AC220 port and the other end into power socket then the charging is finished When it connected the red indicator light CHARGE on the keyb
41. value is 1 Keep this value as 1 when no user calibration has been made Network environment Identification Number Any integer can be entered except 13 0DH carriage return 10 OAH line feeding 42 2AH 38 65535 Every set of the instrument in a network environment should have a unique IDN Please refer to the chapter for communication System locker to avoid modification of the parameters by mistake Entry to linearity correct data inputs There are as many as 12 point data can be input Displays the input contents for the serial port Switches for the built in data logger There are as many as 22 different items can be chosen Time setup for the data logger Data logging direction control If Send to RS 485 is selected all the data produced by the data logger will be transmitted out through the RS 232 RS 485 interface If To the internal serial BUS is selected the data will be transmitted to the internal serial bus which allows a thermal printer 4 20mA analog output module Display the converted value and current value for analog input AI5 Pulse width setup for the OCT OCT1 output Analog output mode selection 9 modes to be chosen Setup for the value via 4mA of the analog output Setup for the value via 20mA of the analog output Analog output checkup www ultrasonicscn com 43 Current output form the analog output Calendar Pres
42. were cancelled because they are not applied to this version of the software 4 1 Menu Window Details Menu window do Function Display flow rate and net totalizers Display flow rate velocity Display date time and positive totalizer www ultrasonicscn com 38 Display net flow rate and totalizer Display date and time flow rate Display total energy and energy rate Display temperatures T1 T2 Display analog inputs converted value and current value for AI3 AI4 Display the all the detailed working status Display today s total flow Window for entering the outer perimeter of the pipe Window for entering the outer diameter of the pipe 0 to 18000mm is the allowed range of the value Window for entering pipe wall thickness Window for entering the inner diameter of the pipe Window for selecting pipe material Standard pipe materials that the user need not know the speed include 0 carbon steel 1 stainless steel 2 cast iron 3 ductile iron 4 copper 5 PVC 6 aluminum 7 asbestos 8 fiberglass Window for entering the pipe material speed only for non standard pipe materials Window for selecting the liner material select none for pipes without any liner Standard liner materials that the user need not know the speed include 1 Tar Epoxy 2 Rubber 3 Mortar 4 www ultrasonicscn com 39 Polypropylene 5 Po
43. with the 1 Power on again Error software 2 Contact with factory Segment Test Error Stored Data Error The parameters When this message displays entered by the user the user should press ENT lose integration key and all the configuration will be restored to the default state Timer Slow Error Problem with the 1 Power on again timer keeper or the Timer Fast Error 2 Contact with factory crystal oscillator Date Time Error Number errors with Initialize the calendar by the calendar menu window M61 Reboot repetitively Hardware problems Contact the factory 5 2 Error Code and Counter Measures The LRF 2000 series ultrasonic flow meter will show Error Code in the lower right corner with a single letter like I R etc on menu windows M00 M01 M02 M03 M90 and M08 When any abnormal Error Code shows counter measures www ultrasonicscn com 48 should be take i asi C UW O OOOOOO be taken Correspondent Message displayed on System Normal Noer J y O 1 No Signals detected Causes Counter measures Detect No 1 Relocate measuring 2 Transducers installed location improperly 2 Clean the spot 3 Too much fouling 3 Check the cords 4 Pipe liners are too thick 5 Transducer cords are not properly connected Hardware problem Contact the factory PoorSig 1 Poor signal detected 1 Relocate measuring Detected 2 Transducers installed place 2 Clean the spot 3 Check
44. y used when the pipe diameter is from 100mm to 6000mm as a matter of fact we suggest that you can use it over 200mm ene f Le Down W method Installation Transducer spacing www ultrasonicscn com ma Le ee W method is usually used on plastic pipes with a diameter from 10mm to 100mm 2 7 5 Transducer spacing N method Installation a Rarely used method 2 8 Installation Checkup Through the checkup of the installation one can check the receiving signal strength the signal quality Q value the traveling time difference of the signals the estimated liquid speed the measured traveling time of the signals and the calculated traveling time ratio Therefore optimum measurement result and longer running time of the instrument can be achieved 2 8 1 Signal Strength Signal strength indicates the amplitude of receiving ultrasonic signals by a 3 digit number 00 0 means there is no signal detected and 99 9 refers to the maximum signal strength that can be received Although the instrument works well if the signal strength ranges from 50 0 to 99 9 stronger signal strength should be pursued because a stronger signal means a better result The following methods are recommended to obtain stronger signals 1 Relocate a more favorable location if the current location is not good enough for a stable and reliable flow reading or if the signal strength is lower than 70 0 www ultrasonicscn com 18 2 Try t
45. y user menu window browsing or viewing Only when the user enters new pipe parameters will the flow meter change measurement to the new parameter changes When new pipe parameters have been entered or when the power has been just switched on the flow meter will enter an adjusting mode to make the signals magnified with proper amplification By this step the flow meter is going to find the best threshold of receiving signal The user will see the progress by the number 1 2 or 3 which are indicated on the right lower corner of the LCD display Any user entered configuration value will be retained into the NVRAM of the flow meter until it is modified by the user www ultrasonicscn com ll When the transducers have been adjusted on the pipe by the user the flow meter will re adjust the signal automatically 2 4 Keypad The keypad for the operation of the flow meter is shown by the following diagram Keys O 9 and arekeys to enter 718 9 cag numbers Key A is the going UP key when the user wants to go to the upper menu window It also Aia works as key when entering numbers 2 3 7 Key W is the going DOWN key when the user nao wants to go down sided menu window It also works as the key when entering numbers Key lt is backspace key when the user wants go left or wants backspace the left character that is located to the left of the cursor Key ENT is the ENTER key for any inputtin
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