Endress+Hauser Proline Prowirl 73 - Page 156

Description of device functions Proline Prowirl 73
156 Endress+Hauser
NET CALORIFIC VALUE Prerequisite
The function is only available if the following was selected in the SELECT FLUID
function:
•METHANE
• USER DEFINED LIQUID with COMBUSTION option in the ENERGY
CALCULATION function
• GAS MIXTURE
or if the selection NATURAL GAS and one of the following NATURAL GAS EQUATION
was selected in the SELECT FLUID section:
•AGA NX-19
• AGA8-DC92
• ISO 12213-2
• AGA8 Gross Method 1
•SGERG 88
Description
• A net calorific value, which is used to calculate the heat flow, can be entered here for
USER DEFINED LIQUIDS.
• If the heat flow of natural gas is to be calculated, a net calorific value must be entered
here for applications with natural gas AGA NX-19, AGA8 Gross Method 1 as well as
SGERG-88.
• The net calorific value of the gas is displayed here in the other cases described.
The net calorific value is calculated as per ISO 6976-1995.
!
Note!
Make sure that the correct reference combustion temperature was entered
(ä 153).
User input/user interface
5-digit floating-point number
Factory setting
40MJ/kg ; the corresponding unit is taken from the UNIT CALORIFIC VALUE MASS or
UNIT CALORIFIC VALUE CORRECTED VOLUME function.
CALORIFIC VALUE ->
ENERGY
Prerequisite
The function is only available if the following was selected in the SELECT FLUID
function:
•NATURAL GAS
•METHANE
• USER DEFINED LIQUID
• GAS MIXTURE
Description
Use this function to define whether the gross or net calorific value is to be used to
calculate the heat flow (of the energy).
The net calorific value is typically used here since it does not take the formation of water
into consideration.
The gross calorific value is more used for applications with condensing boilers.
Options
GROSS CALORIFIC VALUE
NET CALORIFIC VALUE
Factory setting
NET CALORIFIC VALUE
WET STEAM ALARM Prerequisite
The function is only available if SUPERHEATED STEAM was selected in the SELECT
FLUID function (ä 143).
Description
If the temperature comes within 2 °C of the saturated steam curve in steam applications,
error message "#525 WET STEAM ALARM" (ä 68) is displayed.
Options
OFF
ON
Factory setting
ON
Function description, FLOW COMPUTER group