EESIFLO launches first
production prototypes of non-contact flow sensing
units for small line ultra low flow, ultra pure applications
using patented concurrent transit time - CTT technology.
EESIFLO recently introduced
a new series to their flowmeter design which
is a highly accurate and affordable flowmeter
that can measure extremely low flow rates and
small line applications. The flowmeter consists
of a flow detector and a signal converter. In
the initial production prototypes , all the
wetted parts have been made of PFA. This type
of flowcell maintains accuracy of measurement
on small diameter pipes, where several traverses
of the ultrasonic signal are impractical, because
it provides a much longer path length and allows
for 100% area averaging of the flow profile.
EESIFLO has designed sensors
to unique applications, where the piezoelectric
arrangements are made out of standardized
pieces, while the range and resolution is
determined by a combination of frequency selection
and length of the interrogation pipe. Standard
Bore Diameters 6, 8 and 12mm. The technology
allows the flowmeter to work even with a high
degree of bubbles in the liquid.
Typical Accuracy of these units is +/-0.3%
of Reading. Currently all wetted parts are
made of PFA but can be fabricated in many
other materials. The flow sensing is contamination
free from ions or particles ,corrosion resistant,
no metal parts in contact with fluid and easy
to install with standard pipe sizes and threads.
Minute flow measurements are possible even
down to a fraction of a ml per min.
A simple explanation
but not complete is that the fluid to be measured
flows through the flow tube. Two piezoelectric
transducers, mounted at both ends of the measuring
section generate and receive concurrent short
bursts of ultrasonic waves at an average of
1000 times per second. The wave traveling with
the fluid is accelerated and the wave traveling
against the fluid is slowed. The difference
in transit time of the signals is proportional
to the velocity of the fluid. EESIFLO is using
a new technique called concurrent transit time.
This technique solves problems that many traditional
transit time flowmeters have not overcome, namely
true zero stability and immunity to temperature
changes.
Range and resolution
will vary with the speed of sound of the media,
above table show typical values for water.
Liquids
witl lower speed of sound will require shorter
sensors to achieve similar performance, whereas
liquids with higher speed of sound will require
longer sensors.
Some typical features are :
Resolution 0.3mL/M (flight path
dependant)
4-20mA analog output
Binary open collector: 24 V/4
mA reed contact: 48 V/0.1 A
as state output: limit, sign change or error
as pulse output: Pulse value: (0.01...1000) units
Width: (80...1000) ms
In April 2006 the this model will
be available as a blind unit, or with a 2X16 char
LCD showing current flow and totals in selectable
units
Work Modes :
High Resolution Flow Meter (Mono
or Bi-Directional)
Liquid detector (alarm when no
liquid in sensor)
Flow switch (fully programmable)
Electrical :
Power Supply: 12-36VD
Power Consumption: 120mA (24VDC)
Ambient Condition: 0 to 50C/30
-80% RH
Installation: Panel Mounting
(1/8 DIN)
EESIFLO will continue to develop new innovations
in 2006 and 2007. If you have special flowmeter
requirements, please contact one of our direct offices
or major dealers http://www.eesiflo.com/contactus.html
