Endress+Hauser Proline Prowirl 72F, Manual

Page: 6 / 36

Proline Prowirl 72F, 72W, 73F, 73W
6 Hauser
Measuring range for gases [m³/h or Nm³/h]
In the case of gases, the start of the measuring range depends on the density. With ideal gases, the density [
ρ
]
or corrected density [
ρ
N
] can be calculated using the following formulae:
A0003946
The following formulae can be used to calculate the volume [Q] or corrected volume [Q
N
] in the case of ideal
gases:
A0003941
T = Operating temperature, P = operating pressure
Output
Prowirl 72
By means of the outputs in the 4...20mA/HART version of Prowirl 72, the volume flow and, if process
conditions are constant, the calculated mass flow and corrected volume flow can be output via the current
output and optionally via the pulse output or as a limit value via the status output.
Prowirl 73
By means of the outputs in the 4...20mA/HART version of Prowirl 73, the following measured variables can
generally be output:
If configured, the calculated measured variables density, specific enthalpy, saturation steam pressure (for
saturated steam), Z-factor and flow velocity can also be shown on the local display for Prowirl 73.
r
[kg/m³] =
[kg/Nm³] · P [bar abs] · 273.15 [K]
N
r
T [K] · 1.013 [bar abs]
[kg/Nm³] =
[kg/m³] · T [K] · 1.013 [bar abs]
N
r
r
P [bar abs] · 273.15 [K]
[Nm³/h] =
N
Q
[m³/h] · P [bar abs] · 273.15 [K] Q
T [K] · 1.013 [bar abs]
Q [m³/h] =
N[Nm³/h] · T [K] · 1.013 [bar abs]
Q
P [bar abs] · 273.15 [K]
Current output Frequency output Pulse output Status output
Volume flow If configured If configured If configured Limit value*
Temperature If configured If configured – Limit value
Mass flow If configured If configured If configured Limit value*
Corrected volume
flow
If configured If configured If configured Limit value*
Heat flow
(performance)
If configured If configured If configured Limit value*
Saturation steam
pressure (only for
saturated steam)
If configured If configured If configured Limit value*
Operating pressure (if
read in externally)
If configured If configured If configured Limit value*
* Limit value for flow or totalizer