Commissioning Proline Prowirl R 200 HART
132 Endress+Hauser
10.9.4 Calculation of the measured variables
A flow computer can be found in the electronics of the measuring device with order code
for "Sensor version", option "mass (integrated temperature measurement)" and option "mass
(integrated pressure/temperature measurement)". This computer can calculate the
following secondary measured variables directly from the primary measured variables
recorded using the pressure value (entered or external) and/or temperature value
(measured or entered).
Mass flow and corrected volume flow
Medium Fluid Standards Explanation
Steam
1)
Water vapor
IAPWS-IF97/
ASME
• For integrated temperature measurement
• For fixed process pressure, pressure measured directly at the
meter body or if the pressure is read in via current input/HART
Gas
Single gas NEL40 For fixed process pressure, pressure measured directly at the meter
body or if the pressure is read in via current input/HART
Gas mixture NEL40
Air NEL40
Natural gas ISO 12213-2 • Contains AGA8-DC92
• For fixed process pressure, pressure measured directly at the
meter body or if the pressure is read in via current input/HART
AGA NX-19 For fixed process pressure, pressure measured directly at the meter
body or if the pressure is read in via current input/HART
ISO 12213-3 • Contains SGERG-88, AGA8 Gross Method 1
• For fixed process pressure, pressure measured directly at the
meter body or if the pressure is read in via current input/HART
Other gases Linear equation • Ideal gases
• For fixed process pressure, pressure measured directly at the
meter body or if the pressure is read in via current input/HART
Liquids
Water IAPWS-IF97/
ASME
–
Liquefied gas Tables Propane and butane mixture
Other liquid Linear equation Ideal liquids
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 → 110
Mass flow calculation
Volume flow × operating density
• Operating density for saturated steam, water and other liquids: depends on the
temperature
• Operating density for superheated steam and all other gases: depends on the
temperature and process pressure
Corrected volume flow calculation
(Volume flow × operating density)/reference density
• Operating density for water and other liquids: depends on the temperature
• Operating density for all other gases: depends on the temperature and process pressure
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