What is the difference between a metric and a measure?

Metrics and Measures – the building blocks of Flow

Metrics in Flow represent “what you are measuring”.  Examples include:

  • Production volume
  • Water consumption
  • Energy consumption
  • Cost of production
  • Product Quality
  • Environmental Compliance

Measures in Flow are reporting points-of-interest (or KPIs) which relate to these Metrics.  They provide more context than their parent Metrics.  Using “Production volume” as an example, typical Measures would be:

  • Line 1 Volume Produced (hl)
  • Line 1 Volume to Energy Ratio (hl/kW)
  • Line 1 Volume Produced (hl)
  • Line 1 Volume to Energy Ratio (hl/kW)
  • Line 1 Volume Produced (hl)
  • Line 1 Volume to Energy Ratio (hl/kW)

A Measure in Flow is identified by its Name, Unit of Measure and Time Interval.

Measure “Retrieval” Types

There are four "types" of Measures available in Flow:

  • Manually Entered (by a person)
  • Retrieved (from a data source)
  • Aggregated (or rolled up from other Flow Measures)
  • Calculated (from other Flow Measures)

Use a Manually entered measure to set a calculation factor, or to collect values from a meter that is not hooked up to your historian.

Use a Retrieved measure to automatically collect data from an existing data source (e.g. Historian, SQL database, Excel, etc.)

Use an Aggregated measure to aggregate a measure from a smaller time period (i.e. Hour) to a bigger time period (i.e. shift, day, week, month, etc.).  For example, if we have a measure that collects hourly production counts from a Tag Historian, we can then create another measure that sums the results of this hourly measure to create a value for the production day.

Use a Calculated measure to create a calculation from one or more other measures for the same time period.  For example, if we have an hourly measure for production counts, and an hourly measure for electricity used, we can create an hourly calculated measure for the ratio of electricity used per unit of production.

Measure “Time Periods”

There are eight “time period” types available in Flow:

  • Minutely
  • Hourly
  • Shiftly
  • Daily
  • Weekly
  • Monthly
  • Quarterly
  • Yearly

It is important to note that “Minutely” does not imply individual minute “time periods”, but rather “periods” that are a few minutes in duration.  The available “Minutely” duration settings in your calendar config are:

  • 5 minutes
  • 10 minutes
  • 15 minutes
  • 20 minutes
  • 30 minutes

The reason Flow has these “Minutely” time periods is to accommodate the aggregation of data up to an “Hourly” time period.

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