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DMTFC
INSERTION TRANSIT-TIME ULTRASONIC FLOWMETER |
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Four lines 16 alphabetical LCD display
Suitable for liquids of high temperature of -40~150 deg C
Multiple outputs including Hart and ModBus outputs
Transmitter can be integrative explosion-proof
Patented K mode round transducer
The DMTFC wall-mount Insertion 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 system to optimally adapt to different pipe materials automatically.
The flow meters of the DMTFC family are carefully designed with self-explanatory interface and the operation is simple and easy. The unique clamp-on fixture design makes the installation very simple requiring no special skills or tools.
Due to hot-tapped mounting, insertion transducers produce no ultrasonic compound and coupling problem. Even though the transducers are inserted into pipe wall, they do not requier a flow enclosure, thus, do not generate disturbance or pressure drop to the flow. Comparing with clamp on flow meter, the insertion (wetted) type has the advantage of long-term stability and better accuracy. |
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
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Features:
- Cost effective and versatile.
- Spool-piece transducer for best accuracy.
(better than 1.0 % read ) and best long-term stability.
- No moving parts, no pressure drop, no maintenance.
- Easy and economical installation, Hot-tap Installation.
- Wide measure range, 0.03~40ft/s (0.01~12m/s).
- Wide pipe size range, 4~180 inches (DN100~4570mm).
- Suitable for all commonly used pipe materials.
- Signal quality tracking and self-adjusting capabilities.
- automatically match transducer to pipe materials.
- Velocity, volumetric and totalized flow display.
- Bi-directional. Totalizer for net, positive and negative flow display.
- Easy to use and set up. Self-explanatory menu-driving programming.
- Rich input and output functionalities.
- Ideal for both clean and opaque liquid flow measurements.
- In fact, most any liquid containing 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 |
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Velocity |
0.03~ 40 ft/s (0 ~ ¡À12m/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 run 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 |
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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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Security |
Keypad lockout, access code enable |
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Dimensions and Weight |
Std.:241*193*76.5 Weight: <2.5kg |
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Exp: 255*220*110 Weight: <5.0kg |
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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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Pipe Range |
65mm-4570mm |
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Suited Liquid Temperature |
Std. Temp. Transducer: -40¡æ~121¡æ
High Temp. Transducer: -40¡æ~150¡æ |
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Cable Length |
Shielded transducer cable. Standard length 20fts (6m). Can be extended to 990fts (300m). Contact the manufacturer for longer cable requirement. Cable should not be laid in parallel with high-voltage power line; neither should it be close to strong interference source such as power transformers. |
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Dimensions |
Std.: ¦Õ20mm, 190mm; weight:<0.6kg
Extended: ¦Õ20mm, 325mm; weight:<1.6kg | |
DMTFC Insertion Ultrasonic Flow Meter Selection Table
Model DMTFC - 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 DMTFC Insertion Ultrasonic Flow Meter
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DC - X X - X - X - X |
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Transducer Type |
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1¡ªFor Welded Pipe |
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2¡ªFor Cast Iron Pipe |
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3¡ªFor Cement Pipe(long)
(Cement Pipe Wall thickness less tan 110mm) |
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Transducers Temperature |
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N¡ª-40¡«121¡æ |
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H¡ª-40¡«150¡æ |
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Pipeline Diameter |
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0065¡ªDN65 |
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4500¡ªDN4500 |
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Cable Length
XXX (meter)
The Maximum can reach to 300m, also can contact with the
factory for details.
Work Underwater
0¡ªNO
1¡ªYES
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Parts Number Construction example:
For example£ºDMTFC-N-B1NN-N/DC-l-N-0400-030-0
Description: DMTFC insertion ultrasonic flow meter, 220VAC power supply, 4-20mA output, Non-multiple output selections; welded directly for the pipe of transducers, standard transducer temperature, installing pipeline DN400, transducer cable length is 30m, no underwater working conditions.
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The DMTFC flow meters are ideal for process-control or flow measurement at fixed locations. Benefited from our advanced digital signal processing technology, the flow meter works reliably in both clean and opaque liquid flow. Examples of
Applicable liquids:
Water, including cooling water, hot water, chilled water, city water, sea water,
Water supply and drainage water etc.
Secondary sewage, waste treatment, etc.
HVAC, energy measurement system, etc. |
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Series DMTFC Insertion Brochure .pdf
Data Logger System.rar