Endress+Hauser Proline Prowirl 73 - Page 154

Description of device functions Proline Prowirl 73
154 Endress+Hauser
MOLE-% N2 Prerequisite
The function is only available if NATURAL GAS AGA NX-19 was selected in the
NATURAL GAS EQUATION function (ä 149).
Description
Use this function to enter the mole-% of nitrogen in the expected natural gas mixture.
• The values entered in the SPECIFIC DENSITY (ä 153), MOLE-% N2 (ä 154)
and MOLE-%-CO2 (ä 154) 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.
• According to the NX-19 standard, the maximum mole-% of nitrogen is 15%.
• 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
5-digit floating-point number
Factory setting
0.0000%
MOLE-%-CO2 Prerequisite
The function is only available if the following was selected in the NATURAL GAS
EQUATION function (ä 149):
• NATURAL GAS AGA NX-19
• NATURAL GAS AGA8 Gross Method 1
• NATURAL GAS SGERG-88
Description
Use this function to enter the mole-% of carbon dioxide in the expected natural gas
mixture.
• The values entered in the SPECIFIC DENSITY (ä 153), MOLE-% N2 (only
NATURAL GAS AGA NX-19) (ä 154), MOLE-% H2 (only NATURAL GAS AGA8
Gross Method 1 and NATURAL GAS SGERG-88) (ä 154) and MOLE-%-CO2
(ä 154) 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.
• According to the NX-19 standard, the maximum mole-% of carbon dioxide is 15%.
• 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
5-digit floating-point number
Factory setting
0.0000%
MOLE-% H2 Prerequisite
The function is only available if NATURAL GAS AGA8 Gross Method 1 or NATURAL
GAS SGERG-88 was selected in the NATURAL GAS EQUATION function (ä 149).
Description
Use this function to enter the mole-% of hydrogen in the expected natural gas mixture.
The values entered in the SPECIFIC DENSITY (ä
153), MOLE-% H2 (
ä 154) and
MOLE-%-CO2 (ä 154) 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.
User input
5-digit floating-point number
Factory setting
0.0000%
Function description, FLOW COMPUTER group