Nicotra Gebhardt PFP, Руководство по эксплуатации

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Rev. 0 - 05/11/2020
OPERATING MANUAL OPERATING MANUAL
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where:
Q = volume flow rate [m³/h]
∆p = pressure value, read on the manometer [Pa]
ρ = air density [kg·m-3] (1.2 at 20°C, 50% r.h. and 1013.2 hPa)
C = dimensional constant, from the following table on this page.
The K value to be inserted inside the device is:
As you can see, if the measurement is taken at standard air density, the square root assumes a unit value and K = C.
The Probe Calibration Constant C has different values, according to the fan typeand size, as shown in the following table:
PFP C
PFP
PFP_280 84
PFP_315 107
PFP_355 134
PFP_400 170
PFP_450 218
PFP C
PFP
PFP_500 265
PFP_560 334
PFP_630 *
PFP_710 *
PFP_800 *
* For these values, please contact Nicotra Gebhardt .
11.2 How to calculate volume flow rate from pressure probe
The following analytical equations show how to calculate the value of the volume flow rate from the value of the probe pressure
∆p and vice versa. Values of ∆p are given in Pa, while values of flow rate Q are expressed in m³/h.
Analytical expression to determine flow rate values from the pressure values, which can be read on the pressure-probe transducer:
where:
Q = volume flow rate [m³/h]
∆p = pressure value, read on the manometer [Pa]
ρ = air density [kg·m-3] (1.2 at 20°C, 50% r.h. and 1013.2 hPa)
C = dimensional constant, from the following table on this page.
Analytical expression to predict pressure probe manometer readings from the corresponding flow rate values: