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Insertion ultrasonic flowmeter

The DMTF wall-mount Insertion Ultrasonic Flow meter family provides abundant capabilities for accurate liquid flow measurement from outside of a pipe. It utilizes state-of-the-art technologies on ultrasonic transmission / receiving , digital signal proc essing and transit-time measurement. The proprietary signal quality tracking and selfadapting technologies allow system to optimally adapt to different pipe materials automatically. The flow meters of the DMTF family are carefully designed so that their user-interfaces are self-explanato ry and their operation is simple and easy. The unique clamp-on fixture design makes the installa tion very simple and no special skills or tools are required. Due to hot-tapped mounting of insertio n transducers, there is no ultrasonic compound and coupling problem; Even though the transducers are inserted into pipe wall, they do not intrude into the flow, 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.

DMTF transit time flowmeters utilize two transducers, shown as elements A and B in Figure 1, which function as both ultrasonic transmitters and receivers. The transducers are inserted into pipe wall at a specific distance from each other. (The transducers are mounted in Z-mode as shown in Figure 1 ) The flow meter operates by alternately transmitting and receiving a frequency modulated burst of sound energy between the two transducers. The burst is first transmitted in the direction of fluid flow and then against fluid flow. Since sound energy in a moving liquid is carried faste r when it travels in the direction of fluid flow (downstream) than it does when it travels against fluid flow (upstream), a differential in the times of flight will occur. If the fluid is not moving, the time of flight differ ence will be zero and the flow meter will indicate zero flow. The sounds time of flight is accurately measured in both directions and the difference in time of flight is calculated. The liquid velocity (V) inside the pipe can be related to the difference in time of flight (dt) through the following equation: V = K*D*dt, where K is a constant and D is the distance between the transducers.

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. Signal quality tracking and self-adjusting capabilities. 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). Ideal for both clean and opaque liquid flow measurements. Suitable for all commonly used pipe materials. Bi-directional. Totalizer for net, positive and negative flow display. Automatically match transducer to pipe materials. Velocity, volumetric and totalized flow display. Easy to use and set up. Self-explanatory menu-driving programming. Rich input and output functionalities. In fact, most any liquid containing less than 5% total suspended solids(TSS) or aeration. 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 are: 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.

Manufacturer/supplier's information

Company name:		Dynameters International Pty Ltd. [ Homepage ]
Business address:		1504/250 Elizabeth St.
Telephone number:		+86-21-67602289
Contact name:		Jessica Lee [ Email ]

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Product groups: flowmeter   flow meter

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