WaterSight - Sensor Details

Product(s): WaterSight
Version(s): 10.00.
Area: Documentation

Sensor details shows a detailed chart for a specific sensor. By default the a 3 month signal history will be read.

The chart displays initially a time-window of 2.5 days back into past to 12 hours into future with the range-slider below the main graph turned on. This view is particularly useful to monitor network parameters and to easily spot any anomalies (that can represent bursts, leaks, tank overflows, pressure problems, maintenance works, etc.) in real time. The pattern confidence bands are represented by a grey band, while real (re-sampled) values are represented as a black, red or orange circles. Whenever real data (re-sampled) goes outside the pattern confidence bands (above percentile 95 or below percentile 5 of the pattern), an outlier is identified and the real value is color coded with a red circle. The user has also the option to navigate in the time history series to understand past behaviors or have access to future expected behavior (short-term forecasts), by moving the range-slider below the main graph.

Note: The user can navigate to the sensor details from the Sensor Status or Sensor Overview pages, by clicking in the name of the sensor.

Sensor Name

The name of the sensor is displayed above the graph, in the upper left corner. The user can easily switch between different sensors by directly clicking on the down arrow   located on the right side of the sensor name.

Pattern

The pattern confidence bands are represented with a grey color. The Pattern drop down lets the user select the time period for which the confidence bands are based.

The user has the option to define the historic time range to be used to compute these pattern confidence bands: last month, last 2 months, last 3 months, last 6 months or last year of data. If there is not enough historical data to compute the pattern confidence bands an informative message is displayed, and only real (re-sampled) values are shown. Clicking on this message removes the message.

Interval

Specifies on the one hand the rate at which raw signal readings are re-sampled (15min, 1hour, daily) and on the other hand how the sensor information is charted.

  • 15 minutes: raw signal data is re-sampled in every 15 minutes interval.
  • 1 hour: raw signal data is re-sampled in every 1 hour interval.
  • Daily minimum: The minimum value for each day (one value per day) is computed using statistical analysis (based on the 5th percentile of the time series).  
  • Daily average: The average value for each day (one value per day) is computed using statistical analysis (based on the 50th percentile of the time series)
  • Daily maximum: The maximum value for each day (one value per day) is computed using statistical analysis (based on the 95th percentile of the time series)

All 15 minutes values and hourly values are evaluated looking backwards. For example if the value at 9h15 is 10 l/s, this represents the re-sampled value from 9h00 to 9h15. If the hourly value is 20 l/s at 10 AM, this represents the re-sampled value from 9 AM until 10 AM. All daily values are evaluated for the specific day that is being displayed. For example if the value for day 10th is 20 l/s, this value is calculated for the time period between 00h:00mm and 23h:59mm of day 10th. 

Graphic Tools

Use the graphic toolbar to control the display of the charts shown on the sensor card:

On the configuration settings it is possible to turn on/off the time range slider below the main graph as well as to select the historical time range period that can be displayed: last 3 months, last 6 months, last year, last 2 years. 

Selected Sensor

Field Description
Id Scada ID/Tag of the sensor
Type Kind of measurement
Status Status obtained from number of signal readings in the selected signal time range and the expected number of readings.
Latest Timestamp of most recent signal reading

Statistic

Field Description
Minimum (p05) Percentile 5 of the historical time period defined by the user (default is last 3 months), for the integration type time-series defined.  
Median (p50) Percentile 50 of the historical time period defined by the user (default is last 3 months), for the integration type time-series defined.
Maximum (p95) Percentile 95 of the of the historical time period defined by the user (default is last 3 months), for the integration type time-series defined.
Minimum/Median

Ratio of "Minimum (p05)"and "Median (p50)" of the of the historical time period defined by the user (default is last 3 months), for the integration type time-series defined.

Create Event

The user can directly create an event based on the graphs observations. Created events will automatically be saved in the Active Events listplace where they should be managed. 

Pattern Interpretation

When a sensor is recovering from a long period without data, the first few weeks may have patterns that do not look intuitive. Factors to consider when interpreting patterns include:

  • Weekends and weekdays are calculated separately, so there may be regions where the weekdays have sufficient data to display normal patterns, while the adjacent weekends do not.
  • If no historical data is available in the specified pattern duration, the empty regions are displayed as a straight line connecting across the gap.
  • If only one weekday or only one weekend of historical data is available, all percentile values will be equivalent, so a pattern line will be visible but there will be no shaded region.

For more information about WaterSight, please go to OpenFlows WaterSight TechNotes and FAQ's.

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