8
FC-21 Flow Computer
3.2 Corrected Liquid Volume
Measurements:
A flowmeter measures the actual volume in a liquid line. A temperature
sensor is installed to correct for liquid thermal expansion.
Calculations:
• Corrected Volume is calculated using the flow and temperature inputs
as well as the thermal expansion coefficient stored in the flow computer.
Use the "SET FLUID PROPERTIES" submenu to define reference
temperature and density values for standard conditions.
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 corrected volume flow and total of any liquid. Flow alarms are
provided via relays and datalogging is available via analog (4-20mA) and
serial outputs.
Corrected
Liquid Volume
Volume Flow
As calculated in section 3.1
Corrected Volume Flow (Temp. Transmitter)
Corrected Volume Flow = vol. flow * (1 - Therm.Exp.Coef. *(Tf-Tref))
2
Calculations
Corrected
Liquid Volume
Illustration
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
Temperature Transmitter
