Omega FDT-25W User Manual
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User’s Guide
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FDT---222555WWW
Wall Mounter Ultrasonic Flowmeter
omega.com info@omega.com
Servicing North America:
U.S.A.
Headquarters:
800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854
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: info@omega.com
Omega Engineering, Inc.
Toll-Free: 1-800-826-6342 (USA & Canada only)
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.
FDT-25W Wall Mounter Ultrasonic Flowmeter
Wall Mounter Ultrasonic Flow Meter User Manual
Contents
1. Introduction...........................................................................................................................................................3
1.1 Preface........................................................................................................................................................3
1.2 Features..................................................................................................................................................... 3
1.3 Flow measurement principle...................................................................................................................3
1.4 Optional transducer.................................................................................................................................. 4
1.5 Typical application.................................................................................................................................... 4
1.6 Product Identification................................................................................................................................5
1.7 Specifications.............................................................................................................................................5
2. Installation and Measurement...........................................................................................................................6
2.1 Dimension.................................................................................................................................................. 6
2.2 Wiring..........................................................................................................................................................7
2.3 Keypad........................................................................................................................................................7
2.4 Menu Windows..........................................................................................................................................8
2.5 Steps to Configure the Parameters....................................................................................................... 9
2.6 Transducers Mounting Allocation.........................................................................................................10
2.7 Transducers Installation.........................................................................................................................11
2.8 Installation Checkup...............................................................................................................................14
3. Menu Window Details.......................................................................................................................................15
3.1 Menu Windows Arrangement................................................................................................................15
3.2 Menu Window Details............................................................................................................................ 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 rate unit................................................................................................25
4.5 How to use the totalizer multiplier........................................................................................................26
4.6 How to open or shut the totalizers....................................................................................................... 26
4.7 How to reset the totalizers.....................................................................................................................26
4.8 How to restore the flow meter with default setups............................................................................26
4.9 How to use the damper..........................................................................................................................26
4.10 How to use the zero-cutoff function...................................................................................................26
4.11 How to setup a zero point....................................................................................................................27
4.12 How to get a scale factor for calibration........................................................................................... 27
4.13 How to use the system locker............................................................................................................ 27
4.14 How to use 4-20mA current loop output...........................................................................................27
4.15 How to use the Frequency Output.....................................................................................................28
4.16 How to use the Totalizer Pulse Output..............................................................................................28
4.17 How to produce an alarm signal........................................................................................................ 29
4.18 How to use the built-in Buzzer............................................................................................................30
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FDT-25W Wall Mounter Ultrasonic Flowmeter
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4.19 How to use the OCT output................................................................................................................ 30
4.20 How to modify the built-in calendar................................................................................................... 30
4.21 How to view the Date Totalizers.........................................................................................................30
4.22 How to use the Working Timer...........................................................................................................30
4.23 How to use the manual totalizer.........................................................................................................30
4.24 How to know how long the battery will last...................................................................................... 31
4.25 How to check the ESN and other minor details...............................................................................31
4.26 How to use the data logger for scheduled output........................................................................... 31
4.27 How to output analogue voltage signal.............................................................................................31
4.28 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 analogue output....................................................................................................32
4.33 How to solidify the parameters...........................................................................................................32
4.34 How to enter the parameters of user-type-transducer................................................................... 32
4.35 How to use the circular display function........................................................................................... 33
4.36 How to enter into the linearity correcting? How to enter into the data?...................................... 33
4.37 How to save / restore frequently-used pipe parameters................................................................34
5. Troubleshooting................................................................................................................................................. 34
5.1 Power-on Error Displays and Counter-Measures............................................................................. 34
5.2 Error Code and Counter-Measures..................................................................................................... 35
5.3 Other Problems and Solutions..............................................................................................................36
FDT-25W Wall Mounter Ultrasonic Flowmeter
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1. Introduction
1.1 Preface
Welcome to use new modern type transit-time ultrasonic flow meter, please read the user manual
carefully before using. The wall-mounted ultrasonic flow meter is designed to be installed in a fixed
location for long-term flow measurement.
1.2 Features
◆ Linearity: 0.5%, Repeatability: 0.2%, Accuracy:±1%
◆ Easy to operate. Good water-proof function.
◆ Several type transducers for selection, measuring pipe size is from DN15mm to DN6000mm
◆ Adopt low voltage, multi-pulse technology to improve accuracy, useful life and reliability.
◆ Powerful Recording Function, record the totalizer data of the last 64 days/64 months/5 years.
1.3 Flow measurement principle
The FDT-25W ultrasonic flow meter is designed to measure the fluid velocity of liquid within a closed
conduit. The transducers are 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
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.
The difference in the transit time measured is directly and exactly related to the velocity of the liquid in
the pipe, show as follows:
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Downstream transducer
spacing
flow
Upstream transducer
Tdown
Tup
θ
downup
TT
TMD
V
2sin
Where
θ 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
ΔT=Tup –Tdown
1.4 Optional transducer
STD-WS Standard Clamp on transducer small, pipe size DN15 to DN100 (3/4” to 4”)
STD-HM Standard Clamp on transducer medium, pipe size DN50 to DN700 (2” to 28”)
STD-HL Standard Clamp on transducer large, pipe size DN300 to DN6000 (12” to 240”)
HT-HS High Temp 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 DN6000 (12” to 240”)
1.5 Typical application
The wall-mounting flow meter can be applied to a wide range of pipe flow measurements. Applicable
liquids include pure liquids as well as liquid with small quantity of tiny particles.
Examples are:
Water (hot water, chilled water, city water, sea water, waste water, etc.);
Sewage with small particle content;
Oil (crude oil, lubricating oil, diesel oil, fuel oil, etc.);
Chemicals (alcohol, acids, etc.);
Plant effluent;
Beverage, liquid food;
Ultra-pure liquids;
Solvents and other liquids
FDT-25W Wall Mounter Ultrasonic Flowmeter
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Items
Specifications
Main unit
Accuracy
±1% of reading at rates >0.2 mps
Repeatability
0.2%
Principle
Transit-time measuring principle
Response Time
0~999 seconds,user-configurable
Velocity
±32m/s
Pipe Size
DN15mm-6000mm
Display
LCD with backlight, display accumulated flow/heat, instantaneous
flow/heat, velocity, time etc.
Output
One channel standard isolation 4-20mA or 0-20mA active output.
One channel OCT output(programmed between the pulse width
6-1000ms,default value is 200ms)
One channel isolation Relay output,with positive,negative,net
accumulation pulses and different alarm signals)
One 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 totalizer flow rate and
heat quantity of the last 512days/128months/10years.
Automatically record the time of power-on/off and flow rate of the
last 30times.Replenish by hand or read the datas through Modbus
communication protocol.
pipe
material
Steel, stainless steel, cast iron, cement pipe, copper, PVC,
aluminum, FRP etc. Liner is allowed
Size
15-6000mm
Straight pipe
section
In the upstream it must be beyond 10D, in the downstream it must
be beyond 5D, in the upstream the length must be beyond 30D from
the access of the pump. (D stands for pipe diameter)
Liquid
Types
Water, sea water, industrial sewage, acid & alkali liquid, alcohol,
beer, all kinds of oils which can transmit ultrasonic single uniform
liquid
Temperature
Standard: -30˚C - 90˚C ，High-temperature：-30˚C - 160˚C
Turbidity
Less than 10000ppm, with a little bubble
Flow Direction
Bi-directional measuring, net flow/heat measuring
Environment
Temperature
Main Unit: -30˚C - 80˚C
Transducer: -40℃ -110℃, Temperature transducer: select on
enquiry
Humidity
Main Unit: 85% RH
1.6 Product Identification
Each set of the flow meter has a unique product identification number or ESN (electronic serial
number) written into the software that can only be modified with a special tool by the
manufacturer. In case of any hardware failure, please provide this number which is located on menu
window M61 when contacting the manufacturer.
1.7 Specifications
FDT-25W Wall Mounter Ultrasonic Flowmeter
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Transducer: standard is IP65, IP68(optional)
Cable
Twisted Pair Line, standard length of 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 than 1.5W
Protocols
MODBUS, M-BUS, Fuji extended protocol and other factory protocol
2. Installation and Measurement
2.1 Dimension
FDT-25W Wall Mounter Ultrasonic Flowmeter
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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 window. It also works as the “+”
2.2 Wiring
2.3 Keypad
key when entering numbers.
FDT-25W Wall Mounter Ultrasonic Flowmeter
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Key ▼/- is the going DOWN key, when the user wants to go down-sided menu window. It also works as
the “–” key when entering numbers.
Key ◄ 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 inputting 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.
2.4 Menu Windows
The user interface of this flow meter comprises about 100 different menu windows that are numbered
by M00, M01, M02 … M99.
There are 2 methods to enter certain menu window:
1. Direct going/entering. The user can press the MENU key followed by two-digit number keys. For
example, the menu window M11 is for the entering of pipe outer diameter. The display will go to the
M11 menu window after the user presses MENU 1 1 .
2. Pressing ▲/+ and ▼/- keys. Each time of the ▲/+ key pressing will proceed to the
lower-numbered menu window. For example, if the current window is on M12, the display will go to the
number M11 window after pressing 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 M14 for the selection of pipe materials.
3. Displaying windows only, like M00 to display Velocity, Flow Rate etc.
For number entering windows, the user can directly press the starting digit key when the user is going
to modify the value. For example, when the current window is on M11, and the user is going to enter
219.2345 as the pipe outer diameter, the user can get the numbers entered by pressing the following
serial keys: 2 1 9 . 2 3 4 5 ENT.
For the option selection windows, the user should first press the ENT key to a selection modification
mode and then select the relevant options by pressing the ▲/+ and ▼/- keys or the digit keys to select
the option with a number antecedent to the option. In the end, the ENT key must be pressed to make
the selection. For example, with menu window M14 for the selection of pipe material selection, (the
MENU 1 4 should be pressed first to enter this menu window if the current menu window is on a
different window. The pipe material is stainless steel which has a number “1” antecedent to “stainless
steel” on the display, the user should first press the ENT key to enter into a selection modification mode,
then either make the selection by pressing the ▲/+ and ▼/- keys to make the cursor on the line that
displays “1. Stainless Steel”, or make the selection by pressing the 1 key directly.
FDT-25W Wall Mounter Ultrasonic Flowmeter
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Generally, the ENT key must be pressed to enter a modification mode. If the “Locked M47 Open’
message is indicated on the lowest line of the LCD display, it means the modification operations is
locked out. In such cases, the user should go to M47 to have the instrument unlocked first before any
further modification can be made.
2.5 Steps to Configure the Parameters
The following parameters need to be configured for a proper measurement:
(1) Pipe outer diameter
(2) Pipe wall thickness
(3) 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
(4) Liner material and its sound speed and thickness, if there is any liner.
(5) Liquid type (for non-standard liquids, the sound speed of the liquid is also needed)
(6) Transducer type adapted to the flow meter. Generally the Standard M1 clamp-on transducers will
be the selected option.
(7) Transducer mounting methods (the V-method or Z-method is the common option)
(8) Check up the Space displayed on M25 and install the transducers accordingly.
(9) Store the 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 outer diameter,
and then press ENT key.
(2) Press key ▼/- to enter M12 window to input the digits for the pipe outer diameter and then press
ENT key.
(3) Press key ▼/- to enter M14 window, and press ENT key to enter the option selection mode. Use
keys ▲/+ and ▼/- to scroll up and down to the intended pipe material, and then press ENT key.
(4) Press key ▼/- to enter M16 window, press ENT key to enter the option selection mode, use
keys ▲/+ and ▼/- to scroll up and down to the liner material, and then press ENT key. Select “No
Liner”, if there is no liner.
(5) Press key ▼/- to enter M18 window, press ENT key to enter the liner thickness and then press
ENT key (if there is liner)
(6) Press key ▼/- to enter M20 window, press ENT key to enter the option selection mode, use keys
▲/+ and ▼/- to scroll up and down to the proper liquid, and then press ENT key.
(7) Press key ▼/- to enter M23 window, press ENT key to enter the option selection mode, use keys
▲/+ and ▼/- to scroll up and down to the proper transducer type, and then press ENT key.
(8) Press key ▼/- to enter M24 window, press ENT key to enter the option selection mode, use keys
▲/+ and ▼/- to scroll up and down to the proper transducer mounting method, and then press
ENT key.
(9) Press key ▼/- to enter M25 window and check up the installation space.
(10) Press MENU 2 6 to store the parameter setup (refer to M26)
FDT-25W Wall Mounter Ultrasonic Flowmeter
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L up
L dn
L up
L dn
L up
L up
L up
L dn
L dn
L dn
Piping Configuration
and
Transducer Position
Ups t r e a m
Dim e n s i o n
Dow n s t r e a m
Dim e n s i o n
L dn
x D ia m e ters
L up
x D ia m e ters
10D
5D
10D
10D
12D
20D
20D
5D
5D
5D
5D
5D
L up
L dn
30D
5D
L up
L dn
(11) Press MENU 9 0 to check up signal strength and quality, the bigger of the value the better.
Generally the signal strength should be better than 60.0, and signal quality should be better than 50.0.
(12) Press MENU 9 1 to check up time ratio, the ratio value should be in the range of 100±3%
(13) Press MENU 0 8 to check up the working status, “R” means work well
(14) Press MENU 0 1 to check up the measuring data.
Note: 1. For heat measurement, please connect PT100 which installed in water supply and water back
pipe to T1, TX1, T2, TX2, GND terminal.
2. After setting 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 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.
An optimum location would be defined as a straight pipe length full of liquid that is to be measured. The
piping can be in vertical or horizontal position. The following table shows:
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