Kỹ thuật đồng hồ lưu lượng :

 Mr Hồng - 0972 973 234

 hong.nguyenvan@thietbi.....vn

 ------------------------------------------

 Kinh doanh :

 Ms Vân Anh - 0904 883 101

 vananh.nguyen@thietbi.....vn

TƯ VẤN CÔNG NGHỆ :

Mr. Nguyễn Ngọc Tuyên

Giám đốc điều hành - CEO

tuyen.nguyen@thietbi.........vn

 Transit-time Ultrasonic Flowmeters

PRINCIPLE OF MEASUREMENT

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 flow meter works, two transducers transmit and receive the ultrasonic signal which travels firstly downstream and then travels upstream (Figure 1). Because  ultra sound travels faster downstream than upstream, there will be a difference of time of flight(△). When the flow is still, the time difference(△) 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.

  V: Liquid velocity
  K: Constant 
  D: Distance between the two transducers
  dt: difference in time of flight

More Details

DMTFB wall-mount Clamp-on Ultrasonic Flow Meters

DMTFC wall-mount Insertion Ultrasonic Flow Meters

DMTFF Wall-mount Flanged Ultrasonic Flow Meters

DMTFH Handheld Ultrasonic Flow Meters

DMTFP Portable Ultrasonic Flow Meters

DMTF-Ex Transit Time Ultrasonic Flow Meter

  
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