Liquid Controls SP3850 - Manual (Page 14)

SP3850 Flow Computer
10
3.4 Batching
Measurements:
A flowmeter measures the actual volume in a liquid line. A temperature
sensor can also be installed to correct for liquid thermal expansion (see
3.2 Corrected Volume).
Calculations:
• Volume flow is calculated using the flowmeter frequency output and the
user entered K-Factor.
• Corrected Volume is calculated using the flow and temperature inputs
as well as the thermal expansion coefficient stored in the flow computer.
• Comparison of the amount delivered with desired batch amount.
Output Results:
• Display Results
Flow Rate, Batch Total, Non-Resettable Total, Temperature, Density
or Pressure
• Analog Output
Rate, Total, Temperature, Density or Pressure
• Pulse Output
Total (volume or corrected volume/mass)
• Relay Outputs
Batch Total, Rate, or Temperature Alarms
Applications:
Batching and monitoring flow and total of any liquid. Batching is
accomplished via relays and datalogging is available via analog (4-
20mA) and serial outputs.
Batching
Batching Illustration
Calculations Volume Flow
As calculated in section 3.1
Corrected Volume Flow (Temp. Transmitter)
Corrected Vol. Flow = volume flow * (1 - Therm.Exp.Coef. *(Tf-Tref)) 2
(See also API 2540 equation)
Flowmeter Temperature Transmitter
(Optional)
Solenoid Valve
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