2 gas mass, Gas mass, Calculations gas mass illustration – Liquid Controls SP4000 User Manual
Page 17: Mass flow p t, Mass flow = actual volume flow • ρ, Tz ρ, Reference density t, Reference temperature p, Reference pressure z, Reference z-factor
SP4000 Flow Computer
14
Flowmeter
Temperature
Transmitter
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
Pressure
Transmitter
3.2 Gas Mass
Measurements:
A flowmeter measures the actual volume flow in a gas line. Temperature and pressure
sensors are installed to measure temperature and pressure.
Calculations:
• Density and mass flow are calculated using gas characteristics stored in the flow
computer.
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, Pressure, Temperature, Density Alarms,
Peak Demand, Demand Last Hour
Applications:
Monitoring mass flow and total of gas. Flow alarms are provided via relays and datalogging
is available via analog (4-20mA) and serial outputs.
GAS MASS
Mass Flow
P
T
ref
Z
ref
Mass Flow = Actual Volume Flow •
ρ
ref
•
•
•
P
ref
T
Z
ρ
ref
= Reference density
T
ref
= Reference temperature
P
ref
= Reference pressure
Z
ref
= Reference Z-factor
Calculations
Gas Mass
Illustration