Measurements
are made by sending bursts of signals through a pipe
. The measurement of flow is based on the principle
that sound waves travelling in the direction of flow
of the fluid require less time than when travelling
in the opposite direction. At zero velocity , the transit
time or delta T is zero. If we know the diameter of
the pipe , the pipe wall thickness and the pipe wall
material the angle of refraction can be calculated automatically
and we will know how far apart to space our transducers.
The difference in transit times of the ultrasonic signals
is an indication for the flow rate of the fluid. Since
ultrasonic signals can also penetrate solid materials,
the transducers can be mounted onto the outside of the
pipe. Fast Digital Signal Processors
and signal analysis guarantee reliable measuring results
even under difficult conditions where previously ultrasonic
flowmeters have failed.
Doppler ultrasonic
flowmeters operate on the Doppler shift principal ,
whereby the transmitted frequency is altered linearly
by being reflected from particles and bubbles in the
fluid. The net result is a frequency shift between transmitter
and receiver frequencies that can be directly related
to the flow velocity. If the pipe internal diameter
is known, the volumetric flow rate can be calculated.
Doppler meters require a minimum amount of solid particles
or air in the line to achieve measurements.
Our
instruments and specific system solutions are used for
applications spanning all branches of the process, manufacturing
and municipal sec-tors...
There
were many reasons for this, some people did not have
the service available for rental (so they had to purchase
a unit)...
Measuring
Principle>>
Applications>>
Measurements
are made by penetrating the pipe with ultrasound. Time
differ-ences, frequency variations or phase shifts of
the ultrasonic signals...
You
can practically measure any sonically conductive liquid
without cutting the pipe. It is simply a matter of
minutes to install our meters. Our meters are used
in...
Eesiflo™
Optional Energy Measurement System>>
Eesiflo™
in both fixed and portable versions offers a solution
package using an Energy meter and clamp on sensors we
provide you with the ultimate in Thermal Energy custody
transfer performance.
