Glossary of terms (continued) – Max Machinery 121 INDICATOR User Manual

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12. Glossary Of Terms (Continued)

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 sta-

ble 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 Model121 Series displays flow rate.

Ref. Dens.

Abbreviation for Reference Density. This is the fluid density at reference temperature.

Ref. Temp.

Abbreviation for Reference Temperature. This represents the base or reference condition to which corrected flow will be computed.

Reset/Start Control Input

In a batching system, a single operator activation of the STA RTkey or Control Input 1 will reset the total then start the batch process.

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.

Sqrt

Abbreviation for Square Root Extraction. Used for flow elements using differential pressure measurements.

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.

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. Apresentation 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.