Dynasonics DXN Portable Ultrasonic Measurement System - Manual (Page 12)

INTRODUCTION
General
WARNING
NOT FOLLOWING THE INSTRUCTIONS PROPERLY MAY IMPAIR SAFETY OF EQUIPMENT AND/OR PERSONNEL.
CAUTION
IF THE DXN IS USED IN A MANNER NOT SPECIFIED BY THE MANUFACTURER, THE PROTECTION PROVIDED BY THE
EQUIPMENT MAY BE IMPAIRED.
The DXN portable ultrasonic flowmeter 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 ease
of installation.
In transit time mode the flowmeter uses 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-Mount where the sound transverses the pipe two times, W-Mount where the sound transverses the pipe four
times, or in Z-Mount where the transducers are mounted on opposite sides of the pipe and the sound crosses the pipe once.
The selection of mounting method is based on pipe and liquid characteristics, which both have an effect on how much signal
is generated. The flowmeter operates by alternately transmitting and receiving a frequency modulated burst of sound energy
between the two transducers and measuring the time interval that it takes for sound to travel between the two transducers.
The difference in the time interval measured is directly related to the velocity of the liquid in the pipe.
TOP VIEW
OF PIPE
W-Mount V-Mount Z-Mount
TOP VIEW
OF PIPE
TOP VIEW
OF PIPE
Figure 7: Ultrasound Propagation
Application Versatility
The DXN flowmeter can be successfully applied on a wide range of metering applications because the meter has both transit
time and Doppler capabilities. The full range of fluids from ultrapure to thick slurries can be measured. The simple-to-program
transmitter allows the standard product to be used on pipe sizes ranging from 0.5…100" (12…2540 mm)*. A wide variety of
liquid applications can be accommodated:
• Ultrapure liquids
• Cooling water
• Potable water
• River water
• Chemicals
• Plant effluent
• Sewage
• Sludge
DXN Portable Ultrasonic Measurement System
Page 12 February 2013