Calculation Server

What Calculations Will You Create?

Each Canary System includes a Calculation Server you can use with existing Canary Historian tags to create new calculated tags that are then stored in the Canary Historian.

With the Calculation Server you can:

• Combine multiple tag values to create averages
• Roll-up daily totals into weekly accumulations.
• Create new tags based on the relationship of other tag values.

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Ways to Use Calculated Tags

For example, a lift station's pump is being monitored with a single flow sensor.  That tag is named InFlow.  Typically, the pump cycles a few times per hour.  Using the Axiom chart below, you can see the pump's cycle history for the past 8 hours.

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Using the Calculation Server, you can create a boolean tag to write a value of 'true' anytime the pump's flow is greater than a value of '1.0'. When we add this new calculated tag to the trend chart, we see that the pump has actually been running more frequently than we realized.

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Now, by applying a second calculation, we can count the number of transitions our newly created boolean makes in a twenty-four hour period. Since the Calculation Server allows for new calculations to be back-filled historically, we can instantly obtain results.

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By studying the calculated tag, we can now determine the pump is cycling more often than we intended and take action.

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Using the Calculation Server, you could use the same InFlow tag to provide:

• Number of pump cycles by hour, day, or month.
• Total hours the pump runs per day.
• Average flow per cycle.
• Minimum, maximum, and average flow by hour, day, or month.
• Running flow average by minute, hour, or day.
• And much more...