Liquid Controls SP3850 - Manual (Page 68)

SP3850 Flow Computer
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Acknowledge & Clear Alarms
Acknowledge is used to clear alarm relays and remove any visual alarm messages from the display. In the run
mode, press the ENTER key or activate CONTROL INPUT 3 (if set for ACK) to momentarily clear alarms and
alarm messages. Alarms will reassert themselves if alarm conditions are still present.
Analog Output
The analog signal (4-20mA) that is generated by the SP3850. It can correspond to the Rate, Total, Temperature,
Pressure or Density. This output is used primarily for transmission of process information to remote systems.
Audit Trail
The audit trail is used to track the number of changes made to the units setup program.
Auto Batch Restart
The Auto Batch Restart function allows the user to set an amount of time to automatically restart a batch after the
completion of a batch. This time can be set from 1 to 99 seconds.
Barometric Pressure
An entry of the average, local atmospheric pressure at the altitude or elevation of the installation. (typically
14.696 psia)
Batch Count Mode
Batch Count Mode specifies the user preference for count direction. The "Up" selection begins with a value of
"0" and counts up until the batch size is reached. The "Down" selection begins with a value equal to the desired
batch size and counts down to "0".
Batch Overrun
The SP3850 offers a batch overrun compensation routine. If batch overrun occurs due to slow valve response
time, the unit will compensate for the overrun amount on the next batch. This feature can be disabled if desired.
Batcher
An instrument which controls the dispensing of desired batch amounts. Liquid batching systems are usually
comprised of a batch controller (batcher), flowmeter and control valve. The batcher opens and closes the valve
through the use of relays and measures the amounts of liquid being dispensed via the flowmeter.
Baud Rate
The speed of serial communication transmissions, expressed in bits per second.
Calibration Temperature
The temperature at which a flow sensor was calibrated on a test fluid.
C-Factor (Fluid Expansion Factor)
A parameter in a flow equation which is used to describe the relationship between density or volume and
temperature changes.
Corrected Volume Flow
The equivalently volume at a reference temperature condition which involves the measurement of liquid volume
flow using a flow sensor and temperature sensor to compensate for thermal expansion.
Custody Transfer
Weights and Measure metering codes often specify several requirements for instruments and mechanisms to
prevent and track changes in the setup of an instrument which may be used in the commercial sale of goods. The
SP3850 tracks changes via the Audit Trail.
Data Logger
The capturing of information for later use and the mechanism for specifying the conditions where a capture
should be made.
DC Output / Excitation Voltage
An on-board DC power supply used to power peripheral sensors. The SP3850 offers excitation voltages of
5VDC, 12VDC or 24VDC when powered by AC voltage.
Default Value
The value to be used by the instrument if a sensor failure or out of ranch signal is detected.
Expansion Factor
See C-Factor
Flow Alarm
A visual indication that the volumetric flowrate is above or below the flow alarm setpoint specified by the user.
12. Glossary Of Terms