ITABAR-Sensor Type
IBFD
Operating
Manual
0.
Principle of flow measuring with
ITABAR-Flow-Sensor
If there will be insert a sensor rounded on the face in
a parallel stream with velocity w, damming up of the
fluid will be the result. In the middle of this area are
streamlines, called damming up streamlines, which
will be vertical to the sensor. Velocity of the
becomes approximately zero at this significant point.
Everytime damming up streamlines are laminar. In
this case flow measurement can be handle very easy
(no friction):
Using the theme of Bernoulli, you can calculate:
p
ges
= p
stat
+ ½ w².
With the patented profil of the ITABAR-Flow-
Sensor you can measure the total pressure p
ges
upstreams and the and the static pressure p
stat
downstreams. The difference between static and
total pressure is:
w = (2/
ρ
p
dyn
)
½
.
By knowing the innerside pipe diameter it applies to
the theme of continuity:
V
∼
w A.
Using a proportional factor, called correction factor
k, you can calculate in accordance with the
following formula:
V = k w A
or
m = k
ρ
w A.
This correction factor k is a value only depending on
the ITABAR-Flow-Sensor-Profil. This value had
been find out by INTRA-AUTOMATION
empirically.
Specially for steam-measuring you can not measure
the differencial pressure with electrical or pneumatic
transmitter directly (max. temperature of medium
<
100°C). You have to use impulse pipes containing
an identical head of condensate at identical
temperature. To get this result ITABAR-Sensors
will be delivered everytime with condensate
reservoirs. The flow of steam will not demage the
transmitter. But you can only calculate in
accordance with the theme of pressure transmission
(Pascal), if there will be no air in the pressure pipe
and the chambers of the transmitter. If there is air in
it, you can not neglect friction. The dynamic energy
will not be transmitted to the differential transmitter
without faults. You will not get correct measuring
results.
1. Product
Description
We congratulate you on your purchase of an
ITABAR Flow Sensor type IBFD.
When installed properly, the ITABAR sensor offers
an array of advantages over other measurement
systems with respect to its accuracy, pressure loss,
and installation. The following guide line is
designed to help you with the sensor installation and
operation.
ITABAR-Flow-Sensors are designed in the way that
the innerside profil diameter will not be smaller than
8 mm. This guarantees condensate drops with a
maximal diameter of 6.5 mm will not prevent a
correct measuring (Prandtl, L.).
2. Operating
Conditions
ITABAR Flow sensors type IBFD can be used under
the following conditions:
• Operating pressure: max. 400 bar at 300 °C
max. 160 bar at 590 °C
• Nominal
Pipe
Diameters:
DN 40 to DN 1000
3. Pre-Installation
Checks
Before installation, make sure that all of the
following parts are included in the sensor kit:
• ITABAR-Sensor, Type IBFD
• condensation vessels, flanged or direct welded
on sensor head
• Mounting flange with weld stud
• Gasket for the mounting flange and flanged
model of condensation vessels
• Bolts and nuts (material suitable for temperature
and pressure rating)
• Sensor end support with sealing plug up to
PN 40, for higher pressure closed type
• Instrument valve assembly (if ordered)
NOTE:
The ITABAR type IBFD-26/36 HTG is a
completely welded construction, there are no
flanges, gaskets, stud bolts or nuts needed.
Compare the specifications on the type identification
plate on the sensor with your order form.
The identification plate contains the following in-
formation:
• Serial
number
• Type
name
• Pipe inside diameter
• TAG number
(Measuring location number - if furnished)
• Material
ATTENTION!
You must make sure that the pipe inside diameter
given on the identification plate matches your pipe
diameter.
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