Technical data Proline Prowirl F 200 PROFIBUS PA
188 Endress+Hauser
Energy flow calculation
Volume flow × operating density × specific enthalpy
• Operating density for saturated steam and water: depends on the temperature
• Operating density for superheated steam, natural gas ISO 6976 (contains GPA 2172),
natural gas AGA5: depends on the temperature and pressure
Heat flow difference
• Between saturated steam upstream from a heat exchanger and condensate downstream
from the heat exchanger (second temperature read in via PROFIBUS PA) in accordance
with IAPWS-IF97/ASME → 24.
• Between warm and cold water (second temperature read in via PROFIBUS PA) in
accordance with IAPWS-IF97/ASME.
Vapor pressure and steam temperature
The measuring device can perform the following in saturated steam measurements
between the feed line and return line of any heating liquid (second temperature read in via
PROFIBUS PA and Cp value entered):
• Calculate the saturation pressure of the steam from the measured temperature and
output the value in accordance with IAPWS-IF97/ASME.
• Calculate the saturation temperature of the steam from the specified pressure and
output the value in accordance with IAPWS-IF97/ASME.
Saturated steam alarm
In applications involving the measurement of superheated steam, the measuring device
can trigger a saturated steam alarm when the value approaches the saturation curve.
Volume flow, mass flow and energy flow
Using the Wet Steam Detection/Measurement application packages, the Prowirl 200 can
correct the measured variables volume flow, mass flow and energy flow depending on the
quality of the steam. See the SD for Wet Steam Detection/Measurement for more
information
For detailed information about correcting these measured variables, see the Special
Documentation for the Wet Steam Detection and Wet Steam Measurement
application package → 212
Steam quality, total mass flow and condensate mass flow
The following measured variables are available with the Wet Steam Measurement
application package:
• The measuring device can output the steam quality as a direct measured value (on the
display/current output/HART/PROFIBUS PA).
• Using the steam quality, the measuring device can calculate the total mass flow and
output it in the form of the proportion of gas and liquid.
• Using the steam quality, the measuring device can calculate the condensate mass flow
and output it in the form of the proportion of liquid.
For detailed information about calculations as a function of the steam quality and the
correction of these measured variables, see the Special Documentation for the Wet
Steam Detection and Wet Steam Measurement application package → 212
Measuring range The measuring range depends on the fluid and nominal diameter.
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