ITABAR Flow Sensor Type
IBF
Operating
Manual
2
1.
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 flow
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 term 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 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 term 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 empiri-
cally.
2. Product
Description
We congratulate you on your purchase of an
ITABAR Flow Sensor type IBR.
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.
3. Operating
Conditions
ITABAR Flow sensors type IBF can be used under
the following conditions:
• Operating pressure: max. 320 bar
• Operating temperature: -50°C to +1000°C
• Nominal Pipe Diameters: DN 40 to DN 12000
The sensor material and the mounting hardware can
be specially selected to accommodate spezial
operating conditions. (e.g. corrosive media or
extreme temperatures).
4.
Pre- Installation Checks
Before installation, make sure that all of the
following parts are included in the sensor kit:
- ITABAR sensor, type IBF
- Mounting flange with weld stud
- Gasket for mounting flange
- Bolts and nuts
- Sensor end support, closed or with sealing plug
(for IBF-21, 26, 36 and IBF-66 only)
- Instrument valve assembly (if ordered)
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
• Flow
range
ATTENTION!
You must make sure that the pipe inside diameter
given on the identification plate matches your pipe
diameter.
5.
General Installation Notes
In order to obtain optimal measurement results,
follow the notes concerning the installation of the
ITABAR sensor given below.
5.1 Determination of Pipe Arrangement
For design reasons, the pipe arrangement at the
installation location has to be known before the sen-
sor is manufactured.
On sensors for horizontal pipe arrangements the
instrument connections are placed in-line with the
flow direction. (see figure 1)
For vertical pipe arrangements, the connecting studs
for the measurement of the differential pressure are
arranged at 90°C angle to the flow direction. (see
figure 2)
Differential Pressure Tap
Fig. 1: Horizontal pipe run
