Non-intrusive system is tolerant of
suspended solids and gas pockets
• Clamp-on design provides easy,
low cost installation
• Available for line sizes from 1/2" up to 100"
• Offered with or without a local display
• Provides rate and total (forward, reverse
and net)
• 4-20 mA and pulse outputs for direct
interface to data collection systems
• Designed for maintenance free operation
• Software utility allows in-field configuration
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Operating Principle
Transit time flow meters utilize two transducers which function as both ultrasonic
transmitters and receivers. The flow meters operate 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 faster 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. The
sound’s time of flight is accurately measured in both directions and the difference
in time of flight 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. |
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