Endress+Hauser Proline Prowirl 73 - Page 150

Description of device functions Proline Prowirl 73
150 Endress+Hauser
DENSITY VALUE Prerequisite
The function is only available if USER DEFINED LIQUID was selected in the SELECT
FLUID function (ä 143).
Description
Use this function to enter the fluid density at the fluid temperature specified in the
TEMPERATURE VALUE function to calculate the operating density of user-defined
liquids (for formula for calculation, see SELECT FLUID function).
• The appropriate unit is taken from the UNIT DENSITY function (ä 104).
• We recommend you reset the totalizer if the value in this function is changed.
• A table with sample values for the TEMPERATURE VALUE, DENSITY VALUE and
EXPANSION COEFFICIENT functions is available on ä 158.
User input
5-digit floating-point number
Factory setting
1.0000 kg/dm³
EXPANSION
COEFFICIENT
Prerequisite
The function is only available if USER DEFINED LIQUID was selected in the SELECT
FLUID function (ä 143).
Description
• Use this function to enter the expansion coefficient to calculate the operating density
of user-defined liquids (for formula for calculation, see SELECT FLUID function).
The appropriate unit is taken from the UNIT TEMPERATURE function (ä 102).
• We recommend you reset the totalizer if the value in this function is changed.
• The expansion coefficient can be determined using Applicator ("Fluid properties" tab).
Applicator is an Endress+Hauser software application for selecting and configuring
flowmeters. Applicator is available both via the Internet (www.applicator.com) and on
a CD-ROM for local PC installation.
• If two value pairs for the temperature and density are known (density 
1
at
temperature T
1
and density 
2
at temperature T
2
), the expansion coefficient can be
calculated using the following formula: 
p
= ((
1
÷ 2) – 1) ÷ (T
1
– T
2
)
• A table with sample values for the TEMPERATURE VALUE, DENSITY VALUE and
EXPANSION COEFFICIENT functions is available on ä 158.
User input
5-digit floating-point number, incl. unit (10
–4
· 1/UNIT TEMPERATURE)
Factory setting
2.0700 [10
–4
· 1/K] (expansion coefficient for water at 20 °C)
OPERATING PRESSURE Prerequisite
The function is not available if the following was selected in the SELECT FLUID function
(ä 143):
• GAS VOLUME
• LIQUID VOLUME
• SATURATED STEAM
• This function is not available if PRESSURE was selected in the HART INPUT function
(ä 167).
Description
Use this function to enter the fluid pressure to calculate the operating density (for formula
for calculation, see SELECT FLUID function (ä 143).
See the parameter printout provided. The parameter printout is an integral part of these
Operating Instructions.
User input
5-digit floating-point number
Factory setting
10 bara
Function description, FLOW COMPUTER group