Liquid Controls SP4000 - Manual (Page 20)

17
SP4000 Flow Computer
3.5 Liquid Mass
Measurements:
Actual volume flow is measured by the flowmeter. Temperature is measured by the
temperature transmitter. A pressure transmitter can be used to monitor pressure. Pressure
measurement does not affect the calculation. A density transmitter may be used in place
of a temperature transmitter for direct density measurement.
Calculations:
• The density and mass flow are calculated using the reference density and the thermal
expansion coefficient of the liquid (see "FLUID DATA" submenu)
Output Results:
• Display Results
Mass or Volume Flow Rate, Resettable Total, Non-Resettable Total,
Temperature, Pressure, Density (optional: peak demand, demand last hour,
time/date stamp)
• Analog Output
Mass or Volume Flow Rate, Temperature, Pressure, Density, Peak Demand,
Demand Last Hour
• Pulse Output
Mass or Volume Total
• Relay Outputs
Mass or Volume Flow Rate, Total, Temperature, Pressure, Density Alarms,
Peak Demand, Demand Last Hour
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 3.4
Mass Flow
Mass Flow = volume flow • (1-a • (T
1
-T
ref
)) 2 • ref. density
α
= Thermal expansion coefficient • 10 -6
Calculations
NOTE:
A density transmitter may be used
for direct density measurement.
Flowmeter Temperature
Transmitter
PRINT
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
Optional
Pressure
Transmitter T
1