Liquid Controls SP3850 - Manual (Page 71)

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SP3850 Flow Computer
Quick Update %
This feature is used to disable the rate averaging filter when a significant change in the flow rate occurs. The
user can enter the percent of change needed to be detected to disable the averaging feature. This is especially
useful during start-up and shutdown of flow.
Rate Averaging Filter
The rate averaging filter is used to stabilize fluctuating rate displays. Higher settings provide more averaging for
a more stable display. Derived from the equation:
(OLD DATA x "Avg. Filter" + NEW DATA)
("Avg. Filter" + 1)
Ratemeter
Any device used to display the speed of a process. The ratemeter in the SP3850 displays flow rate.
Ref. Dens.
Abbreviation for Reference Density. This is the fluid density at referenceconditions of temperature and pressure.
Ref. Temp.
Abbreviation for Reference Temperature. This represents the base or reference condition to which corrected flow
will be computed.
Ref. Z-Factor
Abbreviation for Reference Z-Factor. The Z-Factor for a gas at reference conditions of temperature and pressure.
Reset/Start Control Input
In a batching system, a single operator activation of the START key or Control Input 1 will reset the total then
start the batch process.
Roshko
A parameter defined as: Ro = f • temperature correction
cstk
Single_Pulse
The Single_Pulse setting is used for flowmeters with single pulse outputs.
Slow Start Quantity
The Slow Start Quantity is a function that allows an amount to be entered for a Slow Start up. This function requires
two stage valve control. RLY 1 (slow flow) will energize for Slow Start and RLY 2 (fast flow) will energize after
the Slow Start Quantity has been delivered. This helps reduce turbulence when filling an empty container.
Stop/Reset Control Input
In a batching system, a single operator activation of the STOP key or Control Input 2 will stop the batch process
then reset the total.
STP Reference
The users desired pressure and/or temperature to be considered as the reference condition in the computation of
fluid properties or corrected volume conditions.
Strouhal
A calibration parameter defined as temperature corrected K-factor for a turbine flowmeter.
Time Constant
A damping factor for an averaging filter for the analog output. (see also Rate Averaging Filter)
Totalizer
Any device which accumulates and displays a total count.
UVC
Abbreviation for Universal Viscosity Curve. A presentation of the combined flowrate/viscosity calibration for a
turbine flowmeter.
VFD
Abbreviation for Vacuum Fluorescent Display
Visc Coef
Abbreviation for Viscosity Coefficient. One or more coefficients in an equation used to describe the viscosity as a
function of temperature for a fluid.
Volume Flow
The measurement of volumetric flow.
12. Glossary Of Terms (Continued)