HD2114P/HD2134P
- 16 -
V2.3
The error reported in case of misalignment is reported in the following graph:
+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 abscissas reports the rotation angle around its vertical axis compared to the flow direction
(yawing), in ordinates the % error on the differential pressure Pv measurement. As you can see a
difference of over 10° entails an error on the differential pressure Pv measurement of less than
0.5%.
D
IMENSIONS OF
P
ITOT TUBES
T1-…
T2-…
T3-…
T4-…
d
L
t
Diameter d
(mm)
3 5 8 10
Tip
length t
(mm)
33 55 88 135
Length L
(mm)
300
400
600
500
800
500
800
1000
Order 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
F
LOW RATE MEASUREMENT
The flow rate measurement requires knowledge of the duct or vent area orthogonal to the flow: the
menu items indicated by "SECT m2" and "SECT INC2" define the section area m
2
or inch
2
.
To set the area value, select the "SECT m2" menu item, and using the arrows, set the desired value
in m
2
. Confirm the selection by pressing the ENTER key.
