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DMTFB
CLAMP-ON TRANSIT-TIME ULTRASONIC FLOWMETER |
Four lines 16 alphabetical LCD display
Suitable for liquids of high temperature of -40~250 deg C
Multiply outputs including Hart and ModBus outputs
Transmitter can be integrative explosion-proof
Patented K mode round transducer
The DMTFB wall-mount Clamp-on Ultrasonic Flow meter Seires provide abundant capabilities for accurate liquid flow measurement from outside of a pipe. It utilizes state-of-the-art technologies in ultrasonic transmission /receiving, digital signal processing and transit-time measurement. The proprietary signal quality tracking and self-adapting technologies allow the system to optimally adapt to different pipe materials automatically.
The flow meters of the DMTF family are carefully designed with their user-interfaces self-explanatory and their operation simple and easy. The unique clamp-on fixture design makes the installation very simple, requiring no special skills or tools.
Due to the non-invasive nature of clamp-on transducers, there is no pressure drop, no moving parts, no leaks, no risk of contamination or corrosion. |
Principle of Operation:
DMTF 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 in which case the ultra sound transverses the pipe twice, or W-method in which case the ultra sound transverses the pipe four times, or in Z-method in which case the transducers are mounted on opposite sides of the pipe and the ultra sound transverses the pipe only once. The selection of mounting method depends on pipe and liquid characteristics. When the flow meter works, the two transducers transmits and receives ultrasonic signal amplified by multibeam that travels firstly downstream and then upstream (Figure 1). Because ultra sound travels faster downstream than upstream, there will be a difference of time of flight(¡÷£ô). When the flow is still, the time difference(¡÷£ô) is zero. Therefore, as long as we know the time of flight both downstream and upstream, we can work out the time difference, and then the flow velocity (V) and flow volume (Q) via the following formula.
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V= K*D* dt
Where: V: Liquid velocity
K: Constant
D: Distance between the two transducers
dt: difference in time of flight | |
- Cost effective and versatile.
- High accuracy, 0.5%, or 1.0% reading.
- Noninvasive, no moving parts, no pressure drop, no maintenance.
- Easy and economical installation, no pipe cutting.
- Wide measurement range, 0~40ft/s (0~12m/s).
- Wide pipe size range, 1/ 2~180 inches (DN 12~4570mm).
- Suitable for all commonly used pipe materials.
- Signal quality tracking and self-adjusting capabilities.
- automatically match transducer to pipe materials.
- Four lines display: total flow, flow rate, velocity and meter running status.
- Bi-directional measurement. Totalizer display for net, positive and negative flow.
- The trasmitter is easy to use and set up.
- Multiple input and output terminals.
- Ideal for both clean and opaque liquid flow measurement.(Note: most liquids contain less than 5% total suspended solids (TSS) or aeration. |
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Transmitter |
Power Supply |
(Std) 10-28 VDC @ 2.5VA max., 115/230VAC 50/60Hz ¡À15%@ 5VA max., Solar energy 12VDC |
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Velocity |
-40 ~ 40 ft/s (-12 ~ 12m/s), bi-directional |
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Display |
4 line¡Á16 English letters LCD back lit, can display total flow, flow rate, velocity and meter running status etc. |
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Units
Rate
Totalized |
User Configured (English and Metric)
Rate and Velocity Display
(FWD, NET, REV or BATCH) gallons, ft³, barrels, lbs, litters, m³,kg |
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Output |
4~20mA, OCT Pulse, Relay, RS232C or RS485, options: up to 8 GB Data logger, Hart +(4~20mA), ModBus Protocol etc. |
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Accuracy |
¡À1.0% of reading at rates >0.5 m/s |
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¡À0.005 m/s of reading at rates<0.5 m/s |
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Sensitivity |
Flow Rate: 0.001ft/s (0.0003m/s) |
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Repeatability |
0.2% of reading |
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Dimensions and Weight |
Std.:241*193*76.5, Weight: <2.5kg
Exp: 255*220*110, Weight: <5.0kg |
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Security |
Keypad lockout, access code enable |
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Transducer |
Liquid Types Supported |
Virtually most any liquid containing less than 2% total suspended solids (TSS) or aeration |
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Suited Liquid Temperature |
Std. Temp. Transducer: -40¡æ~121¡æ
High Temp. Transducer: -40¡æ~250¡æ |
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Cable Length |
Std: 20 feet (6m); Opt: Maximum: 990 feet (300m) |
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Pipe Size |
S transducer: 12-50mm
Std M transducer:40 -1000mm
L transducer: 1000-4570mm
K-mode round transducer:12-50mm |
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Dimensions and weight |
S: Size:42*25*25; weight:<0.2kg
M: Size:60*43*43; weight:<0.5kg
L: Size:80*53*53; weight:<1.0kg |
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Accessories |
Couplant |
Dow Corning 111 or 732 (112 for high temp.) |
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Data Logger |
Optional 512M to 8GB SD card |
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S-S Belt |
According to the pipe line size | |
DMTFB Clamp-on Ultrasonic Flow Meter Selection Table
Model DMTFB - X - X X X X - X / *£¨Transducers£©
Clamp-on Series
Approvals
N¡ªN/A
Ex¡ªExdIIBT6
Power Supply
A¡ª110VAC
B¡ª220VAC
E¡ª24VDC
Output Selection 1
N¡ªN/A
1¡ª4-20mA
2¡ªPulse Output£¨Flow rate or Totalizer Output£©
3¡ªRelay
4¡ªRS232
5¡ªRS485
6¡ªHart+(4-20mA)
7¡ªModBus
8¡ªData Logger & Software
9¡ªHeat Flow (Two loops temperature
transmitter 4-20mA input)
Output Selection 2
Same as Output Selection 1
Output Selection 3
Same as Output Selection 1
Product Service Code
Please Contact the factory for the details, if not available, select: N
Transducer Selection Table of DMTFB Clamp-on Ultrasonic Flow Meter
Model DB - X X X - X - X
Transducer Type
S¡ª Small (12-50mm)
M¡ª Middle (40-1000mm)
L¡ª Large (1000-4570mm)
K¡ª Round small-Pipe Round Clamp-on
transducers (12-50mm)
Transducer Temperature
N¡ª -40¡«121¡æ
H¡ª -40¡«250¡æ£¨Exclusive the large pipeline£©
Mounting Type
N¡ª Common
M¡ª Magnetic (only L, M type available, M type fit
to above DN80) refer to note 1.
Pipeline Diameter
0012¡ªDN12
1200¡ªDN1200
Cable Length
XXX (meters)
The Maximum can reach to 300m, also can contact with the factory for the details.
Note: For Magnetic force transducer, M type fit to 80-1000mm pipe line.
Parts Number Construction example£º
DMTFB-N-B1NN-N/DB-MNN-0400-030
Description: DMTFB standard Clamp-on ultrasonic flow meter, 220VAC power supply, 4-20mA output, Non-multiple output selections; standard M type transducer, standard temperature, used in pipeline DN400, transducer cable length 30m. |
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The DMTFB flow meters are ideal for process control or flow measurement at fixed locations. Their non-invasive nature makes them indispensable in applications such as chemical liquid processing, hygienic process monitoring, high-pressure flow measurement, etc. Benefited from our advanced digital signal processing technology, the flow meter works reliably in both clean and opaque liquid flow.
Applicable liquids:
Water, including hot water, chilled water, city water, sea water, etc.
Secondary sewage, waste treatment, etc.
Oil, including lubricating oil, diesel oil, fuel oil, etc.
Chemicals, including alcohol, acids, etc.
Solvents
Beverage, food and pharmaceutical processors where non-contact is a must.
HVAC, energy measurement system, etc. |
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Series DMTFB Clamp-on Brochure .pdf
Data Logger System.rar