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 our development department
by clicking this link http://www.eesiflo.com/research-development.html
