Endress+Hauser Proline Prowirl F 200, Operating Instructions Manual

Page: 127 / 224

Proline Prowirl F 200 PROFIBUS PA Commissioning
Hauser 127
Medium Fluid Standards Explanation Heat/energy option
Liquids
Water IAPWS-
IF97/ASME –
Liquefied
gas ISO 6976 Contains GPA 2172
Other
liquid Linear
equation –
1) The measuring device is capable of calculating the volume flow, and other measured variables derived from
the volume flow, across all steam types with full compensation using the pressure and temperature. To
configure device behavior →  98
2) Gross calorific value: combustion condensation energy of the flue gas (gross calorific value > net
calorific value)
3) Net calorific value: only combustion energy
Mass flow and energy flow calculation
NOTICE
The process pressure (p) in the process pipe is required to calculate the process
variables and the limit values of the measuring range.
‣
In the case of the PROFIBUS PA device, the process pressure can be transmitted from
the Profibus master to the measuring device via the AO Block or entered as a fixed
value in the External compensation submenu (→  98).
Steam is calculated based on the following factors:
• Fully compensated calculation of density using the "pressure" and "temperature"
measured variables
• Calculation based on overheated steam until saturation point is reached
Configuration of diagnostic behavior of the diagnostic message S871 Near steam
saturation limitAssign behavior of diagnostic no. 871 parameter set to Off option
(factory setting) as standard →  149
Optional configuration of diagnostic behavior to the Alarm option or Warning option
→  146 option.
At 2 K above saturation, activation of the diagnostic message S871 Near steam
saturation limit .
• The smaller of the following two pressure values is always used to calculate the density:
– Pressure measured directly at meter body or pressure read in via PROFIBUS PA
– Saturated steam pressure, which is derived from the saturated steam line (IAPWS-
IF97/ASME)
• With fixed process pressure = 0 bar abs. the measuring device only calculates on the
saturated steam curve using temperature compensation .
For detailed information on how to perform external compensation, see .
Calculated value
The unit calculates the mass flow, heat flow, energy flow, density and specific enthalpy
from the measured volume flow and the measured temperature and/or the pressure based
on international standard IAPWS-IF97/ASME.
Formulae for calculation:
• Mass flow:  =  ⋅ ρ (T, p)
• Heat flow: =  ⋅ ρ (T, p) ⋅ h
D
(T, p)
 = Mass flow
= Heat flow
 = Volume flow (measured)
h
D
= Specific enthalpy
T = Process temperature (measured)