- -
63
The graph below shows the error in case of misalignment:
+0.6
+0.4
+0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
0
5°
10°
15°
5°
10°
15°
P
v
%
E
R
R
O
R
ANGLE
The axis of abscissas shows the rotation angle around the vertical axis with respect to the flow
direction (yawing), the ordinate axis shows the % error on Pv differential pressure measurement.
As you can see, a difference of more than 10°C implies an error in the differential pressure
measurement lower than 0.5%.
The function that provides the velocity rate – report (1) on page 61 – is affected by temperature
and by atmospheric pressure, as well. Temperature is measured by a thermocouple connected to
the module, when available. As alternative, another source can be selected, choosing
“8-1) Comp.Temp select” in the menu (see page 26).
The same procedure applies to atmospheric pressure: a module that measures atmospheric pres-
sure (PP472) connected to one of the inputs, can be selected as parameter for velocity calcula-
tion. Otherwise, you can digit directly the pressure value in mbar (see “8-3) Comp Atm. Pres-
sure” description in the menu on page 27).
Dimensions of Pitot Tubes
T1-…
T2-…
T3-…
T4-…
d
L
t
1
2
Diameter d
(mm)
3 5 8 10
Point
Length t
(mm)
33 55 88 135
Length L
(mm)
300
400
600
500
800
500
800
1000
Ordering
Code (*)
T1-300
T2-400
T2-600
T3-500
T3-800
T3-800TC
T4-500
T4-800
T4-800TC
T4-1000
T4-1000TC
(*) TC = Pitot tubes with ‘K’ thermocouple sensor
