Liquid Controls SP3850 - Manual (Page 12)

SP3850 Flow Computer
8
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 at a base or reference condition 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
Corrected Flow Rate, Resettable Total, Non-Resettable Total,
Temperature, Density
• Analog Output
Corrected Rate, Total, Temperature or Density
• Pulse Output
Corrected Total
• Relay Outputs
Corrected 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
(See also API 2540 equation)
Calculations
Corrected
Liquid Volume
Illustration
Flowmeter Temperature Transmitter
STOP
START
PRINT
5
0 –
F3
CLEAR
•
MENU
ENTER
HELP
F1
4
PRE 1
3
RATE
2
TOTAL
1
GRAND
6
SCROLL
7
PRE 2
8
F2
9