Siemens SITRANS FX330 - Gross Heat Measurement

6 OPERATION
90
SITRANS FX330
www.siemens.com/flow 08/2022 - A5E36751269-AG EN
6.8.2 Gross heat measurement
In order to calculate gross power the mass flow (compensated by density) is multiplied by the
specific enthalpy:
Gross power [Q
H
] = mass flow [Q
m
] x enthalpy [H]
When measuring gross heat, internally both the flow totalizer and the energy totalizer are used.
The following configuration example describes an easy way to program all necessary settings.
Fo
r this example is assumed that the internal temperature and pressure sensor are used for the
gross heat calculation of superheated steam.
Function Parameters
C6.3 Extras Activate one of the meter type options "Heat" (for saturated steam and
temperature compensation) or "Heat & Dens. by Pres." (for superheated
steam and density compensation by temperature and pressure) by entering
the proper four digit code (if not activated by order). This needs to be done
once.
Enter process parameters:
C1.1 Fluid Steam
C1.2 Medium Superheated Steam
C1.6 Temp. Sensor
C1.6.1 Temp. Source1 Internal ("Temp. Source2" must not be selected as "Internal")
C1.7 Pressure Sensor
C.1.7.1 Pressure Source Internal
C6.5 Units Set units for temperature, pressure and flow.
C1.10 Operating Values
C1.10.3 Oper. Density Operating density is important for sensor limits but will not be used during
operation.
Configure output and totalizers:
C2.1 Current Output
C2.1.1 Current Out. Meas. Gross Power
C2.1.2 0% Range; C2.1.3 100% Range Enter value for 0% and 100% in selected unit.
C4.2 Energy Totalizer
C4.2.1 Measurement Gross Power
C4.2.5 Start Totalizer? Yes
Display two values on local display: (Gross power, Gross energy)
C5.3.1 Function Two Values
C5.3.2 Measurement 1. Line Gross Power
C5.3.6 Measurement 2. Line Gross Energy
Table 6-37: Gross heat measurement
INFORMATION!
This is an example setup for basic gross heat measurement. Other setup options are feasible.