Endress+Hauser Proline Prowirl 73 - Flow Computer Functions

Proline Prowirl 73 Description of device functions
Endress+Hauser 143
11.15 FLOW COMPUTER
Function description, FLOW COMPUTER group
SELECT FLUID
!
Note!
If you want to change the fluid selected, we recommend that you only do so via the
Commissioning Quick Setup (ä 51). All the relevant parameters can be adapted to
the new fluid in the Commissioning Quick Setup.
Options
SATURATED STEAM
SUPERHEATED STEAM
WATER (only volume and temperature measurement possible)
COMPRESSED AIR (no data are recorded in the liquid state)
ARGON (no data are recorded in the liquid state)
CARBON DIOXIDE (no data are recorded in the liquid state)
METHANE (no data are recorded in the liquid state)
NITROGEN
OXYGEN (no data are recorded in the liquid state)
NATURAL GAS (only available as an option, ACTIVATION CODE NATURAL GAS
(ä 111); please note that no data are recorded in the liquid state)
GAS MIXTURE (no data are recorded in the liquid state)
USER DEFINED LIQUID
GAS VOLUME (only volume and temperature measurement possible)
LIQUID VOLUME (only volume and temperature measurement possible)
SATURATED STEAM DELTA HEAT (please observe "Note")
WATER DELTA HEAT (please observe "Note")
REAL GAS
Factory setting
See the parameter printout provided. The parameter printout is an integral part of these
Operating Instructions.
Information on the fluids available for selection
Selected fluid: SATURATED STEAM
Applications:
For calculating the mass flow and the quantity of heat the flow contains.
Calculated variables:
The mass flow, heat flow, density and the specific enthalpy are calculated from the
measured volume flow and measured temperature using the saturated steam curve as per
the international IAPWS-IF97 standard (ASME steam data).
Formulae for calculation:
• Mass flow: m = q ·  (T)
• Quantity of heat: E = q ·  (T) · h
D
(T)
m = Mass flow
E = Quantity of heat
q = Volume flow (measured)
h
D
= Specific enthalpy
T = Operating temperature (measured)
 = Density*
* From the saturated steam curve as per IAPWS-IF97 (ASME)
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