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The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and 

reserves the right to alter specifications without notice.

 

         Servicing North America:

U.S.A.  

Omega Engineering, Inc.

Headquarters:

 

800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854 

  

Toll-Free: 1-800-826-6342 (USA & Canada only) 

 

Customer Service: 1-800-622-2378 (USA & Canada only) 

 

Engineering Service: 1-800-872-9436 (USA & Canada only) 

 

Tel: (203) 359-1660 

Fax: (203) 359-7700 

 

e-mail: [email protected] 

 

 

omega.com   [email protected]

Summary of Contents for FDT-25W

Page 1: ...e mail info omega com For latest product manuals omega com en us pdf manuals Shop online at omega com User sGuide TM omega com en us pdf manuals FDT 2 2 25 5 5W W W Wall Mounter Ultrasonic Flowmeter...

Page 2: ...ecifications without notice Servicing North America U S A Omega Engineering Inc Headquarters 800 Connecticut Ave Suite 5N01 Norwalk CT 06854 Toll Free 1 800 826 6342 USA Canada only Customer Service 1...

Page 3: ...ils 16 4 How To 25 4 1 How to judge if the instrument works properly 25 4 2 How to judge the liquid flowing direction 25 4 3 How to change between units systems 25 4 4 How to select a required flow ra...

Page 4: ...How to adjust the LCD display 31 4 29 How to use RS232 RS485 31 4 30 How to use automatic amending function for offline compensation 32 4 31 How to use batch controller 32 4 32 How to adjust the anal...

Page 5: ...a non contacting clamp on type which will provide benefits of non fouling operation and easy installation The FDT 25W transit time flow meter utilizes two transducers that function as both ultrasonic...

Page 6: ...emp Clamp on transducer small pipe size DN15 to DN100 3 4 to 4 HT HM High Temp Clamp on transducer medium pipe size DN50 to DN700 2 to 28 HT HL High Temp Clamp on transducer large pipe size DN300 to D...

Page 7: ...e channel standard isolation RS485 output Input Three channel 4 20mA analogue input Two channel three wire PT100 resistor input optional Other functions Automatically record the positive negative net...

Page 8: ...20m can be extended to 500m not recommended Contact the manufacturer for longer cable requirement RS 485 interface transmission distance up to 1000m Power Supply AC220V or DC24V Power Consumption Less...

Page 9: ...g 2 3 Keypad The keypad for the operation of the flow meter is as shown by the right picture Keys 0 9 and are keys to enter numbers Key is the going UP key when the user wants to go to the upper menu...

Page 10: ...g the key There are three different types of menu windows 1 Menu windows for number entering like M11 for the entering of pipe outer diameter 2 Menu windows for option selection selecting options like...

Page 11: ...parameter setup For standard pipe materials and standard liquids the following detailed step by step setup is recommended 1 Press keys MENU 1 1 to enter M11 window to input the digits for the pipe ou...

Page 12: ...ng parameter remember to store parameter in MENU 26 to avoid parameter lose after turn off 2 6 Transducers Mounting Allocation The first step in the installation process is the selection of an optimum...

Page 13: ...7 Transducers Installation The transducers used by the FDT 25W series ultrasonic flow meter are made of piezoelectric crystals both for transmitting and receiving ultrasonic signals through the wall o...

Page 14: ...ow 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 3 V method Installation V method insta...

Page 15: ...nter Ultrasonic Flowmeter 13 2 7 4 Z method Installation Z method is commonly used when the pipe diameter is above 200mm 2 7 5 W method Installation W method is usually used on pipes with a diameter f...

Page 16: ...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 purs...

Page 17: ...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 1 If t...

Page 18: ...he screen is the value prior to its turn off Select all totalizer unit in menu M31 M01 Display flow rate velocity M02 Display date time and POS positive totalizer If the positive totalizer is turned o...

Page 19: ...sound speed of non standard liquid used only when option item 8 Other is selected in M20 M22 Window for entering the viscosity of the non standard liquids used only when option item 8 Other is selecte...

Page 20: ...multiplying factor ranges from 0 001 to 10000 Factory default is 1 M34 Turn on or turn off the NET totalizer M35 Turn on or turn off the POS positive totalizer M36 Turn on or turn off the NEG negativ...

Page 21: ...times of output When a number great than 8000 entered for the times of output It means the output will be keeping always The minimum time interval is 1 second and the maximum is 24 hours M52 Data log...

Page 22: ...tion Valid range is 0Hz 9999Hz Factory default value is 0 1000 Hz For Version 12 Version 13 Version 14 flow meters you need a hardware module which shall be plugged to the Serial Expanding Bus for the...

Page 23: ...Alarm 1 7 Reverse Alarm 2 8 Batch Control 9 POS Int Pulse 10 NEG Int Pulse 11 NET Int Pulse 12 Energy POS Pulse 13 Energy NEG Pulse 14 Energy NET Pulse 15 MediaVel Thresh 16 MediaVelo Thresh 17 ON OFF...

Page 24: ...he pump or other devices By selecting item 9 the batch totalizer could act as totalizer witch runs for only a period of the day so that a alarm signal could be produced if the total flow during that t...

Page 25: ...otal 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 100 3 Otherwise the entered...

Page 26: ...flow for this year only for the time past M 9 Display the not working total time in seconds The total failure timer will also include the time when power off if the back up battery is applied M 2 Ent...

Page 27: ...ow meter is adjusting system gain This is normal as far as it does not last long time If an I is displayed it means that there is no signal detected If J is displayed there is hardware problem Turn of...

Page 28: ...ore 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 The master erase s...

Page 29: ...cale factor in menu window M45 The scale factor can be determined by calibration with flow calibration equipment 4 13 How to use the system locker The system locker provides a means of preventing inad...

Page 30: ...e actual output current shown on the ammeter is 4 01mA Then the difference is 0 01mA If the differences are not within tolerance calibrate the current loop The present current loop output is displayed...

Page 31: ...he event include the following 1 There is no receiving signal 2 There is poor signal received 3 The flow meter is not in normal measurement modes 4 Reverse flow 5 Overflow occurs at the analogue outpu...

Page 32: ...t 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 t...

Page 33: ...times displayed in window M 4 4 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 out...

Page 34: ...current output use precision ammeter to measure the output current at the same time use to adjust the digital on the flow meter until the ammeter indicate 4 00 Then press ENT to enter the window of ad...

Page 35: ...ose 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...

Page 36: ...l amendment then input to the Instrument Reverse amendment is very complicated and should be avoided 4 37 How to save restore frequently used pipe parameters You can use menu window 27 to store or res...

Page 37: ...k the cords J Hardware Error Hardware problem Contact the factory H PoorSig Detected 1 Poor signal detected 2 Transducers installed improperly 3 Too much fouling 4 The pipe liners are too thick 5 Prob...

Page 38: ...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 2 The displayed flow rate is much lower or much higher than...

Page 39: ...y OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limite...

Page 40: ...s M U Turbine Paddlewheel Systems M U Totalizers Batch Controllers pH CONDUCTIVITY M U pH Electrodes Testers Accessories M U Benchtop Laboratory Meters M U Controllers Calibrators Simulators Pumps M U...

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