Liquid Controls SP3850 - Manual (Page 15)

11
SP3850 Flow Computer
3.5 Corrected Gas Volume
Measurements:
A flowmeter measures the actual volume flow in a gas line. Temperature
and pressure sensors are installed to measure temperature and pressure.
Calculations:
• Corrected Volume is calculated using the flow, temperature and pressure
inputs as well as the gas characteristics stored in the flow computer
(see "FLUID DATA" submenu). Use the "FLUID" submenu to define
reference temperature and reference pressure values for standard
conditions.
Output Results:
• Display Results
Corrected Volume or Actual Volume Flow Rate, Resettable Total,
Non-Resettable Total, Temperature, Pressure, Density
• Analog Output
Corrected Volume or Actual Volume Flow Rate, Temperature,
Pressure, Density
• Pulse Output
Corrected Volume or Actual Volume Total
• Relay Outputs
Corrected Volume Flow Rate, Total, pressure, Temperature, Density
Applications:
Monitoring corrected volume flow and total of any gas. Flow alarms are
provided via relays and datalogging is available via analog (4-20mA) and
serial outputs.
CORRECTED
GAS VOLUME
Calculations
Corrected
Gas Volume
Illustration
Volume Flow
Pulse Input; Average K-Factor
input frequency • time scale factor
Volume Flow =
K-Factor
Corrected Volume Flow
P . T
ref
. Z
ref
.
Corrected Volume Flow = Volume Flow •
P
ref
•
T
•
Z
Flowmeter Temperature
Transmitter
Pressure
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