user manual of dh1000 electromagnetic flow meter
Contents
1. o o POUT TRX VDIN TRX IOUT ICOM SIG1 SGND SIG2 N H POWER PCOM ACOM ALML ACOM ALMH TCOM EXT EXT DSI SGND DS2 NS oU U Connectors for 211B 15 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Labels of connectors in squared model SIG Signall SGND Signal Ground SIG2 Signal2 DS1 Shielded Exciting DS2 Shielded Exciting2 EXT Exciting Current EXT Exciting Current To Separate Model Sensor VDIN Current Two lines 24V Spots ICOUT Analog Current Output Analog Current Output ICCOM Analog Current Output Ground POUT Flow Frequency Pulse Output PCOM Frequency Pulse Output Ground Frequency Pulse Output ALMH Upper Limit Alarm Output ALML Low Limit Alarm Output Two Alarm Outputs ALCOM Alarm Output Ground TRX Communication Input TRX Communication Input Communication Input TCOM 232 Communication Ground 2 5 2 Signal lines and labels in squared model amp 2 Terminal Cold Welded Q 2 Terminal Cold Welded Metal Screen Metal Screen 10 Heat Shrink Tube O 10 Heat Shrink Tube ON Red 32 Conductor Shielded Cable Green 32 Conductor Shielded Cable Red 32 Conductor Shielded Cable Green 32 Conductor Shielded Cable Cable for Flow Signals2. ccccscccssscceseceeneeeeeeeeseeeseeesseeensseeeseeenseees 34 4 4 Setting Parameters in Menu cccecsccessscessceeesceeeeeceeseeesseeceseecsseeeeeseeenseeeseeeseneenes 35 4 5 Converters parameters ccccccssccssssceesecesseecssceceseceseeeeeeesseecseecseaeeseeeeneeeseeeesseeenes 37 V Inspection and Maintenance of Instrument ecceccceessceeseeceseeeesceeeeseeeeseeesseeeeseeenseeeseeeenaes 46 5 1 Troubleshooting of instrument 0 00 ceescceeseceeseeeeseeeescecesceceesecenseeenseeceeecseeeeeeneeeaes 46 5 2 Process flow of common failures 0 0 0 0 eceescceseceneceseceseceseceseceaeceseceaeceaeceaeeeaeeeaeeeaeees 49 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter I Introduction The performance of electromagnetic flowmeter is in line with the JB T9248 1999 industry standards It is subject to strict inspection as per several technical indicators before it leaves the factory Please be sure to check the appearance after arrival of the flowmeter to confirm whether there are any damages to the instrument during transport For instrument accessories inspection please refer to this chapter 1 1 Model and specification inspection Model and technical specification are available from the nameplate and factory calibration list of the electromagnetic flowmeter for confirming whether they are consistent with those of the ordered one If it is needed to contact our Compa
3. Compound Enter keys getting to the select of parameter and transfer password 0000 and then correct the password with one of the new passwords that are provided by manufacturer Finally push the Compound Enter keys to work in Parameters Setting Way There are 6 Passwords in design and among them 4 for deferent operators in secret and 2 are fixed passwords for system operation 4 3 1 Functions select menu Push Compound Enter keys to the functions select menu push Up or Down keys to select there are tow functions Code Functions Notes Select this function It can be enter the 1 Parameters Set picture of parameter Select this function It can be gross reset 2 Clr Total Rec operation 43 2 Parameters Set Press Enter key It displays Parameters Set function Input password Press 34 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter movie key Movie cursor on the Enter key Press it getting to Parameters Setting status 4 3 3 Clr Total Rec To push Compound Enter keys getting to the select of parameter then push Up key to Clr Total Rec input the passwords When the passwords becomes 00000 this function is done the gross is 0 in the instrument 4 4 Setting Parameters in Menu There are 52 parameters of flowmeter user can set every param
4. 60 C Relative humidity 5 90 Atmospheric pressure 86 106KPa 1 4 Precautions for installation location Installation locations shall be selected according to the following conditions to ensure long term stable operation of the instrument Ambient temperature large temperature changes and direct sunlight shall be avoided if there is heat radiation from a heat source in the installation location thermal isolation or ventilation shall be provided Atmospheric environment places with highly corrosive atmospheric environment or which contain explosive gases shall be avoided for non explosion proof instruments 1 5 Changing the direction of the converter Please do not change the direction of the converter arbitrarily Please contact us if Instruction manual for electromagnetic flowmeter you do change it 1 6 Measurement principle The measurement principle of the sensor of electromagnetic flowmeter is based on Faraday s law of electromagnetic induction A pair of detection electrodes are installed on the tube wall where the measuring tube axis is perpendicular to the magnetic field magnetic line When the conductive fluid moves along the measuring tube axis its movement of cutting a magnetic line will generate induction electric potential which will be detected by the two electrodes on the measuring tube wall Its value is E KBVD Where E induction electric potential K instrument constant B magne
5. No ru eck the power wiring and energize the instrument correctly No ontact the after sales service _ _ _ _ gt Is the fuse blown mae te Replace the fuse B Instantaneous flow is indicated as zero Is the excitation coil connected Is the EC Yes Check whether the resistance at sensor signal terminals A B to b and contact the after sales service the ground is infinite No y Check whether the resistance at sensor signal terminal the ground is zero No ontact the after sales service department C Zero point is unstable No Contact the after sales service department Yes Check the wiring of sensor signal department Yes s A B to a after sales service No I tu Change the installation settings filled A oF sensor IE le ensure full fluid within the pipe Yes Yes 7 Are there bubbles in the liquid ake measures to eliminate the air No Yes Is valve leaking H Replace or repair the valve No v see grounding conditions of the No Proper grounding according to instrument good the requirements Yes vy No y to be continued Darhor Technology Co ltd 49 E mail dudu darhor com Instruction manual for electromagnetic flowmeter continued y Yes Detect whether the electrode is an the dirt on or around the overed by dirt electrode No Is t
6. output current has been calibrated to zero scale that is accurate OmA or 4mA output E Anilg Range When the converters is made in the factory output current have been calibrated to full scale that is accurate 10mA or 20mA output E Meter fact This fact is the special one of sensor made factory and the factory use this fact to unite FLOWMETER electromagnetic flowmeters converters to make sure all the instruments can interchange by 0 1 E MeterCode 11 and 2 Converter code records the date of manufacturing and serial number of converter 45 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter V Inspection and Maintenance of Instrument 5 1 Troubleshooting of instrument Electromagnetic flowmeter is a kind of flowmeter of high precision Therefore we suggest the user regularly perform maintenance for some ordinary parts after a certain period of operation such as checking the wiring liner tube electrode descaling etc For these aspects related to the flowmeter properties and unknown technologies please carefully read the Manual and perform the routine maintenance on the basis of understanding If further maintenance or replacement of parts is required please consult the personnel at our customer service center We will provide you with the most considerate and comprehensive technical support As for the common faults occurring in the general application of the elec
7. 5 For a long pipeline control valve is usually installed downstream of the flowmeter 6 For pipes with opening discharge the flowmeter shall be installed in the bottom section 7 For places where the pipe fall is more than 5 meters air valve shall be installed downstream of the flowmeter th 5 1 oft Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 8 Measurement error caused by accompanying gas and lining damage arising from vacuum shall be avoided Preferred position p Di XA Emptying failure measurement of th zero flow pipe of downstream pipe Opening discharge 9 There shall be no air bubbles in the pipes Pipeline design shall ensure that there are no gases separated out of the liquid The flowmeter shall be installed upstream of the valve Due to the action of valve the pressure in the pipe will be reduced resulting in air bubbles Instruments shall also be installed in the low sections to reduce the impact of air bubbles entrained in the fluid during measurement A A S i Us bubbles Noir bubbles A xX Hho HE No air bubbles Air bubbles 10 Liquid conductivity Do not install the electromagnetic flowmeter at places where the liquid conductivity is very uneven Injection of chemicals upstream of the instrument will easily lead to uneven Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electrom
8. RVVP2 x 32 0 2 Connection and labels of signal lines in squad model 16 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 2 5 3 Links and labels of connectors in Circinal Model L2 Ll COM I COM P AH AL Clalcloratatotacara c eae FUSE It G T Connectors in circinal model Symbols and Description of Connectors in Circinal Pane I Output Current for Flow Measurement COM Output Current Ground for Flow Measurement P Frequency Pulse Output for Bi directional Flow COM Frequency Pulse Output Ground AL Alarm Output for Low Limit AH Alarm Output for Upper Limit COM Alarm Output Ground FUSE Fuse for Power Supply T Communication Input Signal T Communication Input Signal G RS232 Communication Ground Li 220V 24V Power Supply Lo 220V 24V Power Supply 17 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 2 5 4 Labels and connection of signal lines in circinal model White Cable Red 12 Conductor Shielded Cable Black 12 Conductor Shielded Cable Red 10 Conductor Shielded Cable Blue 13 Conductor Shielded Cable Shield Screen Black Shielded Cable Labels and connection of signal lines in circinal model Signal lines labels in circinal model White twisted pair cable for exciting current 12 Conductors Red 12 Conductors B
9. can be equipped with some deferent sensors that have deferent diameter of measuring pipes The pipes in deferent diameters from 3mm to 3000mm can be chosen in relative table E Flow unit The flow unit can choose form the parameters L s L m L h m s m m m h UKG USG and the user can choose the proper unit according to the technological requirement and using habit Notice Using 5 valid to show the value of the flow with the volume unit following the last valid The microprocessor can remind the users of the set mistakes leading to the upper limit and lower limit overflow causing by unsuitable choosing the volume unit For example when caliber is 200mm and choose I h as the display volume unit if the speed of the volume is 1m s and the volume is 113097 L h the figures is more than 5 valid and cause upper limit overflow and unit too large is showed on the panel So now the volume unit can be chosen from m s m min and m h While caliber is 3mm choose m s as the volume unit and the volume is 0 00000707m s it is impossible to show the valid using 5 valid and causing lower limit overflow and unit too large is showed on the panel So now SZ Ris Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter the volume unit can be chose from L s L min or L h E Flow range Flow range means upper limit value and lower limit value is set 0 automatically So it m
10. degree of current output of conversion should be controlled within the scope of 0 1 4 Current line degree checking You can place the standard signal source in 75 50 25 and check the line degree of current output 2 8 3 Electromagnetic flowmeter converter s connection of current output User system DC24V flowmete h Signal input converter two connection 25 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter User system flowmeter converter three connection power supply and current output are not insulated User system Power 24V R 24V Power R T flowmeter converter IOUT X Signal input COMM COM four connection power supply and current output are insulated 2 9 Installation and usage precautions for explosion proof type 2 9 1 Notes that shall be paid attention to before installation and usage of explosion proof electromagnetic flow converter 1 The explosion proof signs shall be clearly marked with Ex sign and words Please open the lid after turning the power off Check whether the explosive gas mixtures existing in dangerous places meet the described range 2 When explosion proof electromagnetic flow converter is used in dangerous places the shell cover of the converter must be tightened To ensure safety safety regulations shall be strictly followed Do not open the converter cover wh
11. instruction a Keys function in self testing way Up key Selecting displayed data on lower line in turn Compound key Enter key Come into parameter setting Enter key Press it to come into the picture of select function Under the measure adjust of the LCD contract is used Compound key Up key or Compound key Down key for several seconds b Function keys for parameters setting Down key Subtract from the number at cursor area Up key Plus 1 to the number at cursor area 33 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Compound key Down key Cursor turns left Compound key Up key Cursor turns right Enter key In Out submenu Enter key Press for two seconds under any state and will return to automate measure way Note 1 When use Compound key you should press Compound key and Up or Down both 2 It will return to the measure way automatically after 3 minutes when under the parameter setting way 3 Direct select of zero correction about the flow you can move the cursor to the left or and use Down or Up to switch 4 3 Function keys for setting parameters To set or correct working parameters the converter should be running in parameters setting way instead of measuring status In measuring status push
12. of explosion proof electromagnetic flow converter must also comply with GB3836 15 200 and GB50058 92 3 Users are not allowed to replace the product parts without authorization 227 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 2 10 Grounding The flow signals generated by the sensor are very weak It is only several millivolt at the full range Therefore the grounding of the sensor shall be good and the grounding wire must be connected as per the following figures The grounding of the electromagnetic flowmeter is based on the following two aspects 1 Analyzed form the working principles of the electromagnetic flowmeter and the return circuit of the flow induction signal current the grounding terminal shall have the same electric potential as the measured medium 2 The earth is used as the zero potential This can reduce the external interferences Generally the process pipes are all the metal tubes which have already been grounded This requirement is easy to meet However when the outside electromagnetic field interference is relatively strong the electromagnetic flowmeter shall be equipped with additional grounding device The grounding wire shall be stranded copper wire with a total area of cross section larger than 4mm The rounding wire of the sensor shall never be connected to the public grounding wire of the motor or other equipment and the gro
13. two signal system 0 10mA and 4 20mA user can select from parameter setting Simulation signal output inner is 24V under0 20mA it can drive 750Q resistance The percent flux of simulation signal output _ Measure value 0 e the scale of current the zero point of current Full scale value The current zero is 0 when 0 10mA and the current zero is 4mA when 4 20mA It can be advanced simulation signal output distinguish User can select the range of measure The manufacture s parameter have been adjusted it can t need adjust If have abnormity it can consult 4 6 2 2 8 2 Simulation Signal Output Adjust 1 The Converter adjust preparative When the converter is running 15 minutes the inner of converter becomes 24 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter stabilization Preparative 0 1 amperemeter or 250Q 0 1 voltage instrument IOUT Converter ICOM 2 Current zero correct When the converter getting into parameter setting selecting to Analog Zero and enter to it The standard of signal fountain getting to 0 Adjust parameter make amperemeter is 4mA 0 004m lt A 3 The full scale current correct To select Anlg Range to enter Adjust the converter parameter make amperemeter is 20mA 0 004mA Adjust the current zero and the full range the current function of the converter reached exactness The line
14. 2 The calibration coefficient of the converter range is wrong Adjust according to the value of range calibration coefficient 3 The installation position of the sensor is not proper The measurement tube is not completely filled with the measured medium or there are bubbles in the medium Check the process flow and improve the installation pattern 4 There is scale formation on the electrode or the inner wall Remove the scale formation 5 The lengths of the upstream and downstream straight pipe sections of the sensor are not enough or there is a just partly open valve 47 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 6 There are some unknown branch pipes in the measuring system 5 The real flow measurement method which is Use a standard flowmeter for used as a comparison for the electromagnetic comparison flowmeter has some internal error Analysis of other possible problems Failure Failure Analysis The measured medium itself is fluctuating or pulsating In fact there is no failure with the electromagnetic flowmeter It is the actual reflection of the flow conditions If the length of the straight pipe section is not enough or the installation point of the flowmeter is too close to the pump the output will be unstable The tube is not completely filled with the liquid or there
15. 40 C Ambient temperature 25 C 60 C Influence of ambient lt 40 1 10 C temperature Repeatability and 0 25 reproducibility Analog output error lt 0 02mA Flow rate measurement range lt 20m s Electrical connection 20mm seal sleeve Buriable lt 5m only IP68 Sensor cable lt 30m consultation with our Company is needed when too long seiis Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter II Installation The performance of our electromagnetic flowmeter is in line with the JB T9248 1999 industry standards It is subject to strict inspection as per several technical indicators before it leaves the factory Please be sure to check the appearance after arrival of the flowmeter to confirm whether there are damages to the instrument during transport 2 1 Pipeline design The following items shall be considered during pipeline design 1 Location The flowmeter shall be installed in dry ventilated places Places where water accumulates easily shall not be selected as the installation locations The flowmeter shall avoid sunshine and rain In case of outdoor installation there shall be rainwater protection facilities Ambient temperature shall be between 25 C 60 C Strong vibration of the flowmeter installation site shall be avoided as much as possible Instruments with a protection degree of IP68 3 meters underwater can be placed in water those with a
16. Darhor Technology Co ltd E mail dudu darhor com Dear users Welcome to use Darhor magnetic flowmeter product Please read the manual carefully before using to understand and master the proper installation and usage methods of the products so as to ensure proper installation and usage and achieve the highest performance of the instrument Our company always adheres to the principle of First class quality first class service and first class technical support Please contact us if there are any problems in the process of using the instrument Our company will not take any responsibility for performance damage of the instrument resulting from unauthorized repair or replacement of parts Table of Contents Vit DUC oirnn esse ees AA NAVA ATAN Seas DUARTE bate ANA 1 1 1 Model and specification inspection ccccccscccssseessseceseeeeeeeeeeeeseeesseeeseeeeeeeeesteeenseees 1 Weds Rakim a lists conti Acta aches tical ek het bad IAE hs eh has Nees 8s 2s aad bat Et ee bases tee 1 13 Storage precautions A soto Saree a SERENA Sea aes 2 1 4 Precautions for installation location ee ceeceesecesecssecesecesecececececesecececeeeceeeseeeceaeeeaenes 2 1 5 Changing the direction of the Converter cccccccecsssceeseesereeeeneeeeeeesseeeseceeesseeeneeensaees 2 1 6 Measurement principle ccceccsccsssccssceceeneeeeseeeeseecssceeseeeesseeesseeesseeesseeeeeseeeseeenaees 3 1 7 Structure of electromagnetic flowmeter c
17. KUAN veh NEN RO to ea DO pe gt ET d Flange Bolt R oS Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 2 4 Overall dimensions ada Dimensions Weight L W H kg 2 4 1 Overall dimensions of no ESO 290 165 s risor 15 150 170 190 20 150 170 190 64 25 150 170 190 32 150 170 190 40 200 170 190 76 50 200 170 195 9 9 65 200 185 225 80 200 200 245 12 3 100 200 220 255 14 7 125 250 250 285 17 9 150 250 285 315 24 6 200 300 340 370 32 7 250 350 395 435 300 400 445 475 350 400 505 545 400 450 565 595 500 500 670 695 600 600 780 805 700 700 860 885 800 800 975 985 900 900 1075 1085 1000 1000 1175 1185 1200 1200 1405 1415 13 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 2 4 2 Plot of Converter Exterior size of the integrated squared shells Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Exterior size of the split squared shells 2 5 Connections of Connectors 2 5 1 Connectors and labels for the squared een caer O RS485 lo OS O OO O Se 98 see
18. User set 4 Finished YM 29 Snsr Code2 User set 4 Product number 30 Field Type Select 4 Typel 2 3 31 Sensor Fact Set count 4 0 0000 5 9999 32 Mult Factor Set count 4 0 0000 5 9999 33 FwdTotal Lo Correctable 4 00000 99999 34 FwdTotal Hi Correctable 4 00000 9999 35 RevTotal Lo Correctable 4 00000 99999 36 RevTotal Hi Correctable 4 00000 9999 37 Year User correct 4 00 99 38 Month User correct 4 00 99 39 Day User correct 4 00 99 40 Hour User correct 4 00 99 Darhor Technology Co ltd 36 E mail dudu darhor com Instruction manual for electromagnetic flowmeter 41 Minute User correct 4 00 99 42 Second User correct 4 00 99 43 PlsntLmtEna Select 4 Enable Disable 44 PlsntLmtVal Select 4 0 010 0 800m s 45 Plsnt Delay Select 4 400 2500ms 46 Pass Word 1 User correct 5 00000 99999 47 Pass Word 2 User correct 5 00000 99999 48 Pass Word 3 User correct 5 00000 99999 49 Pass Word 4 User correct 5 00000 99999 50 Analog Zero Set count 5 0 0000 1 9999 51 Anlg Range Set count 5 0 0000 3 9999 52 Meter Fact Set count 5 0 0000 5 9999 53 MeterCode 1 Factory set 6 Finished Y M 54 MeterCode 2 Factory set 6 Product Serial No 4 5 Converters parameters Parameters of converters can decide the running status process and output ways as well as state of output Correct option and setting of parameters can keep the converters running optimally and get higher accuracies of outp
19. agnetic flowmeter fluid conductivity causing serious interference with the flow indication of the instrument We recommend to inject chemicals from downstream of the instrument if chemicals must be injected from upstream it is required to ensure that the length of upstream straight pipe is at least 5 times the pipe s diameter to guarantee thorough mixing of the liquid 11 Grounding Since the induced voltage signal of electromagnetic flowmeter is very small making it vulnerable to external noise or other electromagnetic signals on special occasions the electromagnetic flowmeter shall be grounded to form a space that can shield the outside interference through grounding of the flowmeter housing so as to improve measurement accuracy 2 3 Mechanical installation 2 3 1 Installation of flowmeter pipes 1 The pipelines shall be corrected prior to installation of flowmeter to ensure the instrument diameter has better concentricity with the pipes of users The axis height deviation shall not exceed 1 5mm for sensors with a nominal diameter below 50mm it shall not exceed 2mm for sensors with a nominal diameter of 65 300mm and it shall not exceed 4mm for sensors with a nominal diameter of 350mm and above 2 The newly installed pipes generally have foreign matters such as welding slag Foreign matters shall be flushed away before installation of the flowmeter This will not only prevent damage of the lining but also prevent measur
20. akes the range and makes the relation of percent display frequency output and current output with flow percent display flow measure measure range 100 frequency output flow measure measure range frequency full current output flow measure measure range current full base point pulse output will not affect E Flow Rspns It means time of filter measure value The long one can enhance the stability of flow display and output digital and fits for gross add up of pulse flow the short one means fast respond rate and fits for production control It is set by select E Flow Direct If users think the direct and design are different just change the direct parameter is OK but not change exciting or signal E Flow zero Make sure the sensor is full of flow and the flow is stillness Flow zero is shown as velocity of flow mm s Converter s zero flow correction displays like this Upper small words FS means measure value of zero Lower large words correction value of zero When FS is not 0 make FS 0 Note if change the value on next line and FS increases please change the to correct FS to zero Flow zero is the compound value of the sensor and should be recorded in sensor list and band The unit will be mm s and the sign will be opposite with correction value 39 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter E Flo
21. are bubbles in the liquid The output is There is electric and magnetic interference from outside stray current not stable The conductivity of the liquid is uneven or too low containing too many particles and fibers The electrode material dose not match the liquid causing the contamination or corrosion of the electrode The grounding is not complete It shall be ensured that the flowmeter the measurement tube and the measured medium are connected and reliably grounded Zero point is unstable The tube is not completely filled with the liquid or there are bubbles in the liquid The grounding is not complete There is electric and magnetic interference from outside stray current an It is subjectively assumed that there is no flow of the liquid in the tube But Zero point is oa i Eni in fact there is a small flow Actually this is not a failure of the flowmeter unstable On the contrary it is the actual reflection of the flow conditions The conductivity of the liquid is uneven or too low or the electrode material dose not match the liquid causing the contamination or corrosion of the electrode The insulation of the signal return circuit decreases 48 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 5 2Process flow of common failures A No indication s power switched on Is the wiring correct _ Yes
22. ase of Empty Pipe Alarm if the pipe was empty the signals of analog output and digital output would be zero and displayed flow would be zero too 4 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Mtsnsr Ena The state of empty pipe can be detected with the function of converter In the case of Empty Pipe Alarm if the pipe was empty the signals of analog output and digital output would be zero and displayed flow would be zero too E Mtsnsr Trip flowmeter sensor use flow resist rate to judge whether full of pipe so empty pipe value is a continuum value Even though different flow has different resist rate when the flow is full the resist rate is steady flowmter use relative resist rate to calculate empty measure value define the full pipe resist rate 100 as empty pipe alarm to adjust to 100 when flow surface is lower than the electrode the electrode touches the air and the rate will be higher so the instrument displays empty pipe alarm For fact use when the flow is full of pipe after adjusting empty pipe to 100 and the surface is lower than the electrode completely flowmeter empty pipe value will get 1000 all more So empty pipe alarm set at about 900 and can alarm empty state correctly When the surface drops from full to empty it will hang some liquid on the wall and this will lead the empty pipe measure not to get the max immediately but needs some time S
23. ccccecsccceeseceeneeeeneeeeseeesseeesseeeseseeeeeeenaaees 4 1 8 Main technical parameters of the electromagnetic flowmeter ceseeseeteeeteeeeeees 5 U Installali li aa aa DA A DA AA DA DA A AT AA 6 2l o Ripene desin ioc dA ATA ned doth AIDA tt ee ead eet ee Ra oe eee 6 2 2 Installati n requirements ssc s4ecdeeocasies ndeoteecs datee E eee 7 2 3 Mechanical installations AA AA AA AERE RAE AN R A a 10 2A Overall dimensions iccteccsescceccdecetecedaccsscedecetscesecesecetecesscevecesscetecessceescesscatecesvestucesscaunes 13 2 5 Connections Of CONNeCtoLs carrieio aa ira AA E AR A 15 2 6 Characteristic and connection Of cable sisciseisonsersirnsrerrs AA ARA ADA irori ioii 18 2 7 Digital output and calculato assi grade ea n a TA Aa ATA AT 21 2 8 Simulation signal output and calculate ee cccccsseceeneeeeseeeeneecsseeesseeeeseeeseeeneees 24 2 9 Installation and usage precautions for explosion proof type ssssssssss acceso cose cose a acenos 26 ALO Ground ng ac ec teectodanes Meare Seas eee NAME RGR Ee a Sawa Maes 28 TH Preparations Before Operation niesienia aa a a a a oeaiei 31 V2 Setting parameters miren e a AA ARA A ATTAC O OE lO NE 32 4 1 Keys and display cceccccccssccsssecesseceeneeeeseecsseeesseeesseceseeeeseecseecsseeeseseeenseesseeesseeenes 32 42 Keys function instruction cccccceccceesscesssceeseeeesseeeeeceeeeeseecececseeeeeeeeeneeesseeensneenes 33 4 3 Function keys for setting parameters
24. d day and Time hour minute and second in Password 5 a PlisntLmtEn For paper pulp slurry and other serosity the flow measure will have cuspidal disturb because the solide grain friction or concussion the measure electrode flowmeter converters use variation restrain arithmetic to conquer the disturbing by designing three parameters to select disturb character Set it enable start variation restrain arithmetic set it disable close variation restrain arithmetic E PlsntLmtVl This coefficient can disturb the variation of cuspidal disturb and calculate as percent of flow velocity thus ten grades 0 010m s 0 020m s 0030m s 0 050m s 0 080m s 0 100m s 0 200m s 0 300m s 0 500m s 0 800m s and the smaller percent the higher delicacy of cuspidal restrain Note when using it must test for select by the fact and sometimes it is not the higher delicacy is good E PlsntDelay This coefficient can select the width of time of restrain cuspidal disturb and the unit is ms If the duration is shorter than flow change in some time flowmeter will think it is cuspidal disturb and if it is longer PMFB will think it is natural It also needs to select parameter in fact 44 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter E User s password 1 4 Users can use 5 grades of passwords to correct these passwords E Analog Zero When the converters are made in the factory
25. ement error caused by foreign matters flowing through the measuring tube during measurement 2 3 2 Precautions Notes on operation 1 Be careful not to damage the instrument when unpacking It is best not to unpack before transporting to the installation site to avoid instrument damage Erection ring shall be used when lifting do not hoist the instrument by putting rod or rope through the sensor measuring tube Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter ee ee X C t Wron orrec Correct 8 See the old sample chart 2 Vibration shall be prevented for the instrument Do not throw or press the instrument heavily It is important to avoid applying force on the flange surface which may damage the lining resulting in abnormal operation 3 Flange face protection Flange protection shall be paid attention to when unpacking the instrument Putting flange on ground without pads or on uneven board is not allowed 4 Junction Box Do not open the junction box before connecting to electric power After wiring is complete please pour our special sealant into the junction box as soon as possible close the junction box lid and tighten the screws to ensure the tightness 5 No usage for a long time Not using for a long time is not recommended after installation If the instrument is not used for a long period of time the following measures shall be taken A Check the tightnes
26. en the power is on 26 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 3 During installation of explosion proof electromagnetic flow converter the cable outlet shall have good sealing See Figure 11 for the structure OOOOOOOO First loosen the converter wire outlet and remove the thread joint 1 and then remove the large washer 2 sealing plug 3 and sealing gasket 4 in order Put the cable through the holes of 4 and 2 and put 4 and 2 into the cable interfaces in order The sealing gasket 4 shall be kept flat It will be deformed due to compression after tightening of thread joint so as to clamp the cable Cable connection must be reliable and the insulation resistance to housing shall not be less than 50MQ YHZ type two core rubber cable 2x1 0 mm 6 5 shall be adopted 4 The converter housing must be well grounded 2 9 2 The following provisions shall be fully followed when using explosion proof converter 1 The explosion proof structure of explosion proof converter must be inspected rigorously before leaving the factory Therefore the user must not scratch the joint faces or form burrs on it when servicing None of the explosion proof parts shall be self manufactured or obtained from other manufactures it shall be ordered from its manufacturer according to explosion proofing specifications 2 The installation usage and maintenance
27. erence of forward and reverse Alarm Enter Up plus 1 page up Down minusl 1 page down Compound Fig 4 1 Keys on squared panel Note When measuring pushing down Compound Key Enter will appear password of changing state base on distinction of secrecy and change the password as we provide Then pushing Compound Key Enter again and you can inter the state of setting parameter If want to return to the running state push Enter for several seconds 32 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 4 1 2 Rotundity define keys and LCD screen display 282 92 f FOH M3 H 000000013 5m Flow volume Unit Flow velocity FLS Percentage FQP Ratio of emptiness MTP Forward and reverse intergated volumes Deference of forward and reverse Alarm Enter Up plus 1 page up key Alarm indicator PA A Down minusl 1 page down key Compound Fig 4 1 c Keys on circinal panel and big LCD display Note When measuring pushing down Compound Key Enter will appear password of changing state base on distinction of secrecy and change the password as we provide Then pushing Compound Key Enter again and you can inter the state of setting parameter If want to return to the running state push Enter for several seconds 4 2 Keys function
28. ers During flowmeter installation the users shall make the flow direction arrow consistent with the on site process flow direction 2 Installation orientation of sensor electrode and installation direction Sensor can be installed horizontally or vertically Horizontal installation Vertical installation In case of horizontal installation the electrodes shall be in horizontal positions so that once there are air bubbles or sediments in the medium the air bubbles will not be adsorbed in the vicinity of electrodes which avoids open circuit at the signal terminals of converter and the sediments will not cover the electrodes which avoids zero drift and so on 3 Tubes shall always be filled with liquid Pipeline structure shall ensure that the instrument measuring tube is Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter always filled with liquid For liquid or slurry containing solid particles vertical mounting of electromagnetic flowmeter is recommended There are three reasons for it first this can prevent phase separation of the measured medium second it can result in more uniform wear of the sensor lining third impurities do not precipitate at the bottom of the measuring tube The flow is from bottom to the top ensuring that the sensor measuring tube is always filled with the medium 4 The flowmeter cannot be installed at the suction side of pumps all xX
29. eter The List of Parameters is shown below Setting Parameters in Menu Parameter words Setting Way Grades Range Language Select 2 Chinese English Comm Addres Set count 2 0 99 Baud Rate Select 2 600 14400 Snsr Size Select 2 3 3000 L h L m L s m h Flow Unit Select 2 m m m s UKG U SG 6 Flow Range Set count 2 0 99999 7 Flow Rspns Select 2 1 50 8 Flow Direct Select 2 Plus Reverse 9 Flow Zero Set count 2 0 9999 10 Flow Cutoff Set count 2 0 599 99 11 Cutoff Ena Select 2 Enable Disable Select 0 001m gt 12 Total Unit 2 in ous 1L 0 001UKG 1UKG0 001USG 35 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 1USG 13 SegmaN Ena Select 2 Enable Disable Was eee Select j 0 10mA 4 20mA 15 Pulse Type Select 2 Freque Pulse Select 0 001L 1m 0 001L 16 Pulse Fact 2 1L 0 001UKG 1UKG0 001USG 1USG 17 Pulse Width Select 2 4 400ms 18 Freque Max Select 2 1 5999 HZ 19 Mtsnsr Ena Select 2 Enable Disable 20 Mtsnsr Trip Set count 2 599 99 21 Mtsnsr Cre Set count 2 0 0000 5 9999 22 Alm Hi Ena Select 2 Enable Disable 23 Alm Hi Val Set count 2 000 0 599 99 24 Alm Lo Ena Select 2 Enable Disable 25 Alm Lo Val Set count 2 000 0 599 99 26 Sys Alm Ena Select 2 Enable Disable 27 Clr Sum Key Set count 3 0 99999 28 Snsr Codel
30. he cathode protection pipe con N Grounding Schematic Diagram when Sensor is Installed on Cathode 29 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Protection Pipe 1 grounding device wire installed when external interference is strong 2 instrument grounding wire 3 grounding flanges or grounding rings they must be insulated to the flanges of the connection pipe 4 connecting lead the sectional area of the copper core gt 6mm which will isolate the cathode protection potential from the sensor 30 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter III Preparations Before Operation After the instrument is installed and wired and before it is put into normal operation the validity of installation and grounding shall be strictly checked It must be pointed out that since the instrument is subject to strict adjustment and real flow calibration in the manufactory and is inspected one by one to be acceptable before leaving the manufactory so generally it can be put into operation without any adjustment Therefore any problem occurring in the initial operation shall be checked analyzed and solved carefully according to all the aspects in the Manual It is strictly forbidden to adjust and move the instrument without any specific purpose since this may disorder or even damage the complete set of i
31. he flowmeter close to strong magnetic field sources such as hange the installation location be high power motor and a from strong magnetic sources transformers No ontact the after sales service department D The measured flow rate is inconsistent with the actual one p No ir stable F gt process C Yes Y No e zero adjustment again Zero adjustmentiseorrect gt ccording to the correct meth Yes y Yes z E covered by dirt around the electrodes No RESES a Se the requirements straight pipe Yes nd No SS matas Yes AA ontact the after sales service department 50 Darhor Technology Co ltd E mail dudu darhor com
32. insulating rubber covered cables can be used as exciting current cables Suggested model is YHZ 2 X 1mm Length of exciting current cable should be equal to that of signal cable When the model STT3200 cables are used for exciting current and signals two cables can be put together as one cable 2 6 3 Output and power line All cables for signals transferring and power supply have to be prepared by users However it should be careful to choose the cables that meet the upper limit load of consuming current Note When DIP switch next to terminal is set to ON places the converter from its inside can provide 28Vpower supply and up pull 10k 2 resistance to output Frequencies PUL to isolated OC gate Alarm Output ALMH ALML and Status Control INSW Therefore when converter has frequency output and works with sensor together DIP switch can be set as ON getting frequency signals from POUT and PCOM terminals Pulse current output alarm current output and external power supply can be seen in Fig 4 4 a When inductive load is connected to converter diode should be used as in Fig 4 4 b O The Meter Current ooo OO 000 CT STOTT r i o0000 E Output current circuit 19 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flow
33. lack Black shielded twisted pair cable 10 Conductors Red connected to Signals 1 13 Conductors Blue connected to Signals 2 Shielded Conductor connected to Signal Ground 2 6 Characteristic and connection of cable 2 6 1 Flux signal line When separated models of converters are assembled with sensors for measuring flow of fluid which conductivity is larger than 50 u S em RVVP2 X 32 0 2 model cable metal shielded signal cable covered with PVC can be used as communication cable for flow signals The length of signal cable should be less than 100 m Signal cables have to be connected to sensors that were assembled by producers Connections of signal cables are shown in Fig 4 3 b for squire shaped models and Fig 4 3 d for circle shaped models respectively The converter can output equivalent level of shielded exciting signal voltage so that interference to flow measurement signals can reduced by means of lowering the distributed capacitance of communication cable When measured conductivity is less than 50 u S cm or signals are transferred in remote distances double conductor and double shielded signal cable at equivalent level of voltage can be used For example Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter special STT3200 cable or BTS model signal cable triple shielded can be used for signal communication 2 6 2 Exciting current cable Two conductor and
34. meter DC Power Supply Integrated Current a 2 3 4 5 6 Connection of electro magnet counter Integrated Flow 1 2 3 4 5 6 Connection of electronic counter 20 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Low Limit Alarm O Connection of alarm output inside outside lt a at Pout ALML ales Lo ALCOM PCOM Connection of OC gate 2 6 4 Grounding Contact area of copper Connector PE on Converter Cabinet for grounding should be larger than 1 6mm7 Contact resistance should be less than 10 Q 2 7 Digital output and calculate Digital output means frequency output and pulse output and both of them use Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter the same output point so user can choose only one type of them but not both 2 7 1 Frequency output Frequency output range is 0 5000HZ and corresponding the percent of flux F fre
35. nstruments that was previously adjusted When put into operation the instrument shall be operated according to the following steps 1 First open the rear and front valves of the sensor to completely fill the measuring tube of sensor with medium 2 Switch the power on Check by using an electroprobe whether the power supply wiring of the converter meets the requirements of the wiring diagram Since there is a flow in the tube the digital display of the converter shall indicate a certain value 3 Adjust the zero position After the instrument is supplied with power for one hour first firmly close the downstream valve of the sensor and then close the upstream valve This can stop the flow in the tube and there will be no leakage The flow is zero Measure the output signal of the converter with an ampere meter and the current shall be 4 0 04 mA If the current is too high or too low readjust the zero position of the current output so as to make the current of the output signal within the above mentioned range 31 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter IV Setting parameters 4 1 Keys and display 4 1 1 Squared define keys and LCD screen display 282 92 l Flow volume FQH M H Unit Flow velocity FLS 3 E 000000013 5m ea Ratio of emptiness MTP Forward and reverse intergated volumes Alarm sitdicator q A a Def
36. ny in case of quality problems or if you encounter some problems in the process of usage please specify the instrument specification and model for us to solve the problems 1 2 Packing list Please check whether the following items have been packed after arrival of the flowmeter Sensor one Converter one split type only Instruction manual one Calibration list one Certificate one Cable split type only with the length ordered by the user Exterior flange to be provided when ordering Bolt amp nut to be provided when ordering Sealant provided when field sealing is required in general it is sealed before Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter leaving the factory Explosion proof certificate explosion proof products only 1 3 Storage precautions Please pay particular attention to the following if the instrument needs to be stored for a longer period of time after arrival 1 The flowmeter shall be packed with the original packing box in the same manner as before shipment 2 Choose a location with reference to the following conditions Do not place in the rain Do not put in a place where shock and vibration exist Do not open the sensor junction box lid of the instrument to avoid dampness which will affect the normal operation of the instrument Ambient temperature temperature and atmospheric pressure shall be Ambient temperature 20 C
37. o if want empty alarm reacts quickly make the threshold smaller as 500 E Mtsnsr Cre Correction of empty pipe range is for testing relative conductivities When the testing fluid full of the pipe of sensor revising coefficient makes the conductivity is constant value For example water has 100uS cm of conductivity approximately and then it can be revised as 100 When conductivity of a tested fluid is5uS cm the relative conductivity may be nearly 2000 If the conductivity of water is revised to 10 as test fluid and conductivity of measured fluid is 5uS cm then relative conductivity will be 200 E Alm Hi Ena Users can choose Enable or Disable E Alm Hi Val 42 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter The parameter of upper limit alarm is percentage of flow range and can be set in the way of setting one numerical value between 0 199 9 When the value of flow percentage is larger than the value of setting value the converter outputs the alarm signal E AlmLo The same as upper Alm Hi E Sys Alm Ena Selecting Enable will have the function and selecting Disable will cancel the function E ClrSum Key User use more than 3 byte code to enter Then set this password in Clr Total Rec E Snsr Codel 2 It is referred to the produced date of sensor and the serial number of product that can keep the sensors coefficient right and accurate E Field Ty
38. ode a pair of electrodes are installed on the measuring tube wall which is perpendicular to the magnetic line they are used to detect the flow signal their materials can be selected based on the corrosiveness of the measured medium 4 Measuring tube used to measure the medium flowing within the measuring tube manufactured from non magnetic stainless steel and flange through welding equipped with insulation lining inside 5 Excitation coil there is a group of coils on the top and bottom of the measuring tube outside for generating the working magnetic field 6 Housing can play the role of instrument protection and sealing Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 1 8 Main technical parameters of the electromagnetic flowmeter Models Integrated type Split type Precision 0 5 Diameter mm DN6 DN800 DN6 DN2000 Flange Meets GB9119 standard carbon steel stainless steel is optional DN6 DN250 PN lt 4 0MPa DN6 DN250 PN lt 4 0MPa Pressure level DN300 DN800 PN lt 1 6MPa DN300 DN800 PN lt 1 6MPa DN900 DN2000 PN lt 0 6MPa Lining material PTFE neoprene polyurethane PE F46 Conductivity gt 5 uS cm Electrode 316L molybdenum 2 titanium Hastelloy titanium tantalum platinum iridium alloy Protection degree IP65 IP65 IP68 is optional for sensor Medium temperature 40 C 80 C 40 C 1
39. ow can be displayed Frequency Output can be used in long time measurement for total integrated flow with volume units Frequency output and pulse output are usually from OC gates so that DC power supplies and load resistors have to be required See Part 4 5 40 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter E Pulse Fact Equivalent pulse Unit is referred to one pulse for value of flow The range of pulse equivalent can be chosen Pulse Pulse Flow Flow Equivalent Equivalent 1 0 001L cp 9 0 001USG cp 2 0 01 L cp 10 0 01 USG cp 3 0 1L cp 11 0 1 USG cp 4 1 0L cp 12 1 0 USG ep 5 0 001m ep 13 0 001UKG ep 6 0 01m ep 14 0 01 UKG ep 7 0 1m cp 15 0 1 UKG ep 8 1 0m cp 16 1 0 UKG ep Under the same flow the smaller pulse the higher frequency output and the smaller error will be The highest pulse output is 100cp s and mechanism electromagnetic counter can get 25 frequency s E Pulse Width Frequency output range is as the upper limit of flow measure just the percent flow 100 Frequency output upper limit can be selected between 1 5000Hz Max 020p s 40ms E Freque Max Frequency output range is as the upper limit of flow measure just the percent flow 100 Frequency output upper limit can be selected between 1 5000Hz The state of empty pipe can be detected with the function of converter In the c
40. pe FLOWMETER affords three exciting frequency types 1 10 frequency type 1 1 16 frequency type 2 1 25 frequency type 3 The small bore one should use 1 10 frequency and large bore one should use 1 16 or 1 25 frequency When using please select type 1 first if the zero of velocity is too high select the type 2 or type 3 Note Demarcate on which exciting type working on it only E Sensor fact Sensor fact is printed on the Label of the sensor when it is made in factory The sensor fact has to be set into Sensor Coefficient Parameter when it runs with converter E MultFactor This is used to bright dyke diving measure such as one sensor is compounded with two like caliber pipes then the factor is 3 0000 43 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter E FwdTotal Hi Lo Positive total volume high byte and low byte can change forthcoming and reverse total value and be used to maintenance and instead User use 5 byte code to enter and can modify the positive accumulating volume 2 Usually it is unsuitable to exceed the maximum the counter set 999999999 E RevTotal Hi Lo User use 5 byte code to enter and can modify the negative accumulating volume gt Usually it is unsuitable to exceed the minimum the counter set 999999999 E Date Year Month Day and Time Hour Minute and Second Users can set the date Year month an
41. protection degree of IP65 cannot be immersed in water 2 Magnetic interference shall be avoided The flowmeter shall not be installed at places near motors transformers or other power supplies that are prone to produce electromagnetic interference 3 Length of straight pipe To ensure the measurement accuracy of the flowmeter it is necessary to guarantee that the length of the straight pipe upstream of the sensor shall be at least 5 times the pipe s diameter SD and that of the straight pipe downstream of the sensor shall be 2 times the pipe s diameter 2D AS Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 4 Maintenance space The flowmeter shall be installed at places that have sufficient repair space 5 Shut off valve and bypass valve shall be adopted Shut off valve and bypass valve can be used for easy maintenance and zero adjustment 6 Supports for the flowmeter Do not install the flowmeter on pipes that can vibrate freely a mounting base shall be used to fix the measuring tube When underground installation is needed supports shall be set for both inlet and outlet pipes and metal protection plate shall be installed above the flowmeter 2 2 Installation requirements 1 Flow direction The flowmeter can automatically detect forward and reverse flow direction The flow direction arrow on the sensor housing is the forward direction specified by the manufactur
42. quency range Measure value Full scale value The up limit of frequency output can be adjusted It can be chosen from 0 5000HZ and also can be chosen low frequency such as 0 1000HZ or 0 5000HZ Frequency output mode general can be used in control application because it responses the percent flux Users can choose pulse output when the equipment is applied to count 2 7 2 Pulse output mode Pulse output mainly applies in count mode A pulse output delegates a unit flux such as 1L or 1M etc Pulse output unit divide into 0 001L 0 01L 0 1L IL 0 001M 0 01M 0 1M 1 M When users choose the pulse unit they should notice the match of the flux range of flowmeter and pulse unit For volume flux count formula as follows Q 0 0007854xD xvV L S Or Qu 0 0007854xD x Vx 10 M S Note D nozzle mm V velocity of flow m s The oversize flux and too small pulse unit will be made the pulse output over the up limit Generally pulse output should be controlled below 2000P S However the too small flux and too large pulse unit will be made the instrument exports a pulse long time Otherwise pulse output is different from frequency output When pulse output cumulates a pulse unit it exports a pulse Therefore pulse output is not equality Generally measure pulse output should choose to count instrument but not frequent instrument 2 7 3 The connection of digital output Digital output has tow connected points digital outpu
43. s of end cap and connection to ensure that moisture and water will not enter the instrument B Periodic inspection Check the above mentioned measures and the inside of the junction box at least once a year However if it is suspected that water has entered the instrument such as after heavy rain etc it shall be checked immediately 2 3 3 Installation of flowmeter 1 Installation direction The flow direction of the measured fluid shall be consistent with the flow mark of flowmeter ll Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 2 The flange gasket between the flanges shall have good corrosion resistance it shall not extend into the inside of pipes 3 When welding or flame cutting is done for pipes adjacent to the sensor separation measures shall be taken to avoid the lining being heated If the instrument is installed in concealed wells or immersed in water sealant shall be used to pot the sensor junction box after installation and commissioning of the system 4 The flange on the sensor shall be bolted with that on the pipe when site installation Bolts and nuts on the instrument shall be tightened with thread in intact and well lubricated conditions Torque spanner shall be used to tighten the bolts according to the sizes of flanges and torque Bolts shall be tightened on a regular basis in daily use to avoid their loosening q fa Nut of Q
44. t connected point digital ground point and symbol as follows FI Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter POUT digital output point PCOM digital ground point POUT is collector plough output user may refer to next circuit to connect 2 7 4 The connection of digital voltage output User equipment Voltage input Inside The connection of digital voltage output 2 7 5 Digital output connect photoelectricity coupling PLC etc inside equipment Digital output connect photoelectricity coupling Commonly user s photoelectricity coupling current is about 10mA so about E R 10mA E 5 24V 2 7 6 Digital output connect relay Pout J Digital output connect relay Commonly relay needs E as 12V or 24V D is extend diode now most middle relays has this diode inside If not have user can connect one outside 2 2R Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Table of digital output parameter POUT Test Parameter a Mini Typical Max Unit condition Voltage IC 100 mA 3 24 36 V Current Vol lt 1 4V 0 300 350 mA IC 100mA Frequency 0 5000 7500 HZ Vec 24V High IC 100mA Vcc Vcc Vcc V voltage Low IC 100mA 0 9 1 0 1 4 V voltage 2 8 Simulation signal output and calculate 2 8 1 Simulation signal output There are
45. the measurement tube the medium are connected and and measured reliably grounded 7 The medium is not smooth or the tube is not filled up with medium Fill up the tube with the medium and ensure the full filling state of the tube 8 The electrode surface is oxidized or covered with attachments Remove the flowmeter and clean the electrode surface 8 The converter malfunctions Fuse or other reasons The flow is changing but the indication of the instrument is out of range The indication of the instrument is not in conformity with the actual flow 1 One signal circuit has short circuit to the ground or open circuit 2 The measurement tube of the sensor is not completely full with the measured medium 3 The grounding is not good 1 The zero position causes the measurement error Check the resistance to the ground of the signal circuit When the tube is full of medium the resistance to the ground of the measure electrode with a multimeter Generally the value shall be several thousand ohms Check whether the circuit is in properly connected signal with a multimeter and improve the installation pattern Check the signal shielding layer and the grounding point resistance and reinstall the grounding device The grounding is not good or the electrode is contaminated After troubleshooting and the inspection restore zero position
46. tic induction intensity V average velocity within the measuring pipe section D inner diameter of the measuring tube During flow measurement fluid will flow through the magnetic field perpendicular to the flow direction the flow of conductive fluid will induce electric potential which is directly proportional to the average velocity so it is required that the conductivity of measured fluid is above the minimum conductivity The induced voltage signal is detected by the two electrodes and transmitted via cable to the converter which will display the cumulative flow and instantaneous flow in the converter s display through a series of digital processing Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 1 7 Structure of electromagnetic flowmeter 1 converter 2 flange 3 insulation lining 4 electrode 5 measuring tube 6 excitation coil 7 housing It is mainly composed of the following components as shown in the figure 1 Converter to provide a stable excitation current to the sensor and amplify the induced electric potential of the sensor and convert into standard current signals or frequency signals for display control and regulation of flow 2 Lining is a complete layer of insulated amp corrosion resistant materials at the inside of the measuring tube and on the sealing surface of flange to prevent short circuiting of the flow signal 3 Electr
47. tromagnetic flowmeter the customer can perform the conventional diagnostics according to the following table Failure Possible causes Inspection and Troubleshooting Liquidis 1 The power supply wires are not properly Check whether the power flowing but connected or there is some problem in the return supply is on or whether the there is no circuit of the power supply return circuit of the power indication supply is in good condition on the with a multimeter instrument 2 The connecting terminals of signal circuit or Switch the connecting or there is excitation circuit is wrongly connected terminals of signal circuit A no signal terminal and B terminal or output excitation circuit X terminal and Y terminal 3 The sensor is damp or the signal circuit is Check whether the insulation damaged and as a result short circuit to the of the signal circuit is in good ground exists condition with a multimeter 4 The output signal circuit is not properly Check by using a multimeter connected or the internal wires are loose whether the signals can be accessed 5 The excitation return circuit is open Check whether the excitation return circuit is in good condition with a multimeter 46 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter 6 The grounding is not complete It shall be ensured that the flowmeter
48. unding resistance shall be less than 10Q When the sensor is installed on the metal tube and there is no insulation coating on the inner wall of the metal tube the grounding shall be according to the following figure ZL lt 10Q0 9 l Grounding Schematic Diagram when Sensor is Installed on Metal Tube 1 grounding device wire installed when external interference is strong 2 instrument grounding wire When the sensor is installed on the plastic pipe or on the pipe with 28 Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter insulation coating paint or lining both ends of the sensor shall be equipped with grounding rings or grounding flanges so as to ground the measured medium flowing in the pipe and achieve the zero potential Otherwise the electromagnetic flowmeter cannot work properly F acon Grounding Schematic Diagram when Sensor is Installed on Plastic Pipe or on Pipe with Insulation Lining 1 grounding device wire installed when external interference is strong 2 instrument grounding wire 3 grounding flanges or grounding rings The inner wall and outer wall of the pipe resistant to electrolytic corrosion are generally insulated so the measured medium has no ground potential Therefore the sensor must be grounded with the grounding rings when it is installed on t
49. ut bother in display and in measurement There are 6 grades of passwords for setting parameters function Grades 1 to grade 5 of passwords are for users and grade 6 of password is for manufacturer Users can reset their passwords of grades 1 4 in grade 5 Users can check converters parameters in any grade of password However if users want to change parameters pf converters deferent grade of parameters have to be used by the users Grade 1 of password set by manufacturer as 0521 users can only read parameter Grade 2 of password set by manufacturer as 3210 users can change 1 26 parameters Grade 3 of password set by manufacturer as 6108 users can change 1 27parameters Grade 4 of password set by manufacturer as 7206 users can change 1 45parameters 237s Darhor Technology Co ltd E mail dudu darhor com Instruction manual for electromagnetic flowmeter Grade 5 of password Fixed users can change 1 52 parameters Password Grade 5 can be set by skilled users Grade 4 is mainly used for resetting total volume in password Grades 1 3 can be set by any one who can be chosen by users E Language There are 2 languages for flowmeter converter operation They can be set by users according to the users needs E Comm Addres It means this instrument s address when communicates with many and has 01 99 holding the 0 E Baud Rate 600 1200 2400 4800 9600 19200 38400 baud rate E Snsr Size flowmeter converters
50. w cutoff Flow cutoff is set in percentage of Upper Limit Range of flow and users can delete all Negligible Small Signals of flow volume velocity and percentage out of displaying and outputting them Sometimes user can delete output of current output signal and frequency pulse output signal only to have flow velocity and percentage being displayed 5 2 3 11 Total Unit Converter display is counter with 9 bits and the max is 999999999 Integrator units are L m UKG and USG liter stere English gallon American gallon Flow integrator value 0 001L 0 010L 0 100L 1 000L 0 001m 0 010m 0 100m 1 000m 0 001UKG 0 010UKG 0 100UKG 1 000UKG 0 001USG 0 010USG 0 100USG 1 000USG E SegmaN Ena When SegmaN Ena is enable if the flow flows the sensor will export pulse and current cumulate the gross at the same time When it is disable the sensor will export pulse as O and current as 0 4mA or OmA for the flow flows reversals E Analog Type Output current types can be chosen by users as 0 10mA or 4 20mA practically E Pulse Type Two kinds of Pulse Outputs are can be chosen Frequency Output and Pulse Output Frequency Output is continuous square waveform and Pulse output is a serial wave of square wave Frequency output is mainly used for instant flow and total integrated flow in short time measurement Frequency output can be chosen in equivalent frequency unit and volume of integrated fl
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