9
FC-21 Flow Computer
3.3 Liquid Mass
Measurements:
Actual volume is measured by the flow element (DP transmitter,
Flowmeter). Temperature is measured by the temperature transmitter. A
density transmitter can be used for direct density measurements.
Calculations:
• The density and mass flow are calculated using the reference density
and the thermal expansion coefficient of the liquid (see "SET FLUID
PROPERTIES" submenu)
Output Results:
• Display Results
Flow Rate, Resettable Total, Non-Resettable Total, Temperature,
Density
• Analog Output
Rate, Total, Temperature or Density
• Pulse Output
Total
• Relay Outputs
Rate, Total or Temperature Alarms
Applications:
Monitoring mass flow and total of any liquid. Flow alarms are provided via
relays and datalogging is available via analog (4-20mA) and serial outputs.
Liquid Mass
Liquid Mass
Illustration
Volume Flow
As calculated in section 3.1
Mass Flow
Mass Flow = volume flow * density
Calculations
STOP
START
5
0
–
TIME
CLEAR
•
MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND
6
SCROLL
7
PRE 2
8
DENS
9
Orifice Plate
with DP Transmitter
Temp./Dens.
Transmitter
STOP
START
5
0
–
TIME
CLEAR
•
MENU
ENTER
HELP
TEMP
4
PRE 1
3
RATE
2
TOTAL
1
GRAND
6
SCROLL
7
PRE 2
8
DENS
9
Flowmeter
Temp./Dens.
Transmitter
