Proline Prowirl 73 Description of device functions
Endress+Hauser 153
REFERENCE
COMBUSTION
TEMPERATURE
Prerequisite
The function is only available if NATURAL GAS AGA8-DC92 or NATURAL GAS ISO
12213-2 was selected in the NATURAL GAS EQUATION function (ä 149).
Description
Use this function to enter the reference combustion temperature of natural gas to
calculate the natural gas heat flow.
The appropriate unit is taken from the UNIT TEMPERATURE function (ä 102).
!
Note!
This setting does not change the permitted temperature range of the measuring system.
Pay attention to the temperature application limits specified in the product specifications
(ä 84).
User input
5-digit floating-point number
Factory setting
Depends on country ä 180
REFERENCE-Z-FACTOR Prerequisite
The function is only available if REAL GAS was selected in the SELECT FLUID function
(ä 143).
Description
Use this function to enter the Z factor for gas under reference conditions. The values
defined in the REFERENCE PRESSURE (ä 151) and REFERENCE TEMPERATURE
(ä 151) functions apply as the reference conditions, (for formula for calculation, see
the SELECT FLUID function).
The real gas constant Z indicates the extent to which a real gas differs from an ideal gas
that exactly satisfies the general gas law (p · V ÷ T = constant, Z = 1). The real gas
constant approaches the value 1 the further the real gas is from its liquefaction point.
The Z factor can be determined using the "Applicator" software. Applicator is an
Endress+Hauser software application for selecting and planning flowmeters. Applicator is
available both via the Internet (www.applicator.com) and on a CD-ROM for local PC
installation.
User input
5-digit floating-point number
Factory setting
1.0000
SPECIFIC DENSITY Prerequisite
– The function is only available if NATURAL GAS was selected in the SELECT FLUID
function (ä 143).
– The specific density of natural gas is entered if NATURAL GAS AGA NX-19,
NATURAL GAS AGA8 Gross Method 1 or NATURAL GAS SGERG-88 is selected in
the NATURAL GAS EQUATION function (ä 149).
– The specific density of natural gas is displayed if NATURAL GAS AGA8-DC92 or
NATURAL GAS ISO 12213-2 was selected in the NATURAL GAS EQUATION
function (ä 149).
Description
Use this function to enter the specific density of the natural gas.
(Ratio of the density of natural gas at reference operating conditions to the density of air
at reference operating conditions; corresponds to the "relative density" as per
ISO 14532-2003.)
• The values entered in the SPECIFIC DENSITY, MOL-% N2, MOL-% CO2 and
MOL-% H2 functions are interdependent. For this reason, if the value in one of these
functions is changed, the values in the other functions also have to be adapted
accordingly.
• The NX-19 standard is not defined for certain combinations of parameters (specific
density, pressure, temperature, mole-% nitrogen and mole-% carbon dioxide) and the
measuring device displays error message #412. In such instances, the mass flow can
no longer be calculated with the NX-19 standard.
User input/user interface
5-digit floating-point number
Factory setting
0.6640
Function description, FLOW COMPUTER group
To Next Page
Loading...
