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6. Menu functions
24
6.4 Input
4
I n p u t
6.4 Input
521
For velocity measurement with the Pitot tube, the
internal pressure sensor 0 - 100 hPa is the best for
velocities from 5 - 100 m/s. For measurements in the
range of 1 - 12 m/sec., use the external differential
pressure probe 0638 1347 with measuring range
0 - 100 Pa. The velocity v is calculated in the instru-
ment from the pressure difference p in the Pitot tube
according to the following formula:
v [m/sec.] = S x
To activate the velocity rate measurement and volume
flow rate calculation, please refer to chapter 6.5.6.
Alternatively, it is possible to enter the variables which
influence the air density at the measuring location:
- temperature (see point 6.4.1)
- relative humidity (see point 6.4.2)
- absolute pressure (see point 6.4.3)
Additional input options for calculating the velocity or
volume flow rate are the
- cross-section (see point 6.4.5)
- offset factor (see point 6.4.6)
Calculation formula:
.
3
V [m
/h] = K x v [m/s] x A [m
- Pitot tube factor (see point 6.4.7)
1 In the main menu, select Input with
and confirm the selection with
2 Select the required function with
3 Activate setting mode with
200000 x p [hPa]
3
rho [g/m
]
2
] x 3600
.
or
.
or
.
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