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Removing unwanted spikes in trend data

Solved975 views27th August 2024
1
hans sanders [DevOps Advocate]438 21st June 2024 1 Comment

Hi,

we have a temperature probe that in normal conditions measures temperatures in teh range of 15 - 30°C.
Due to a bad connection the temp sensor is showing readings of 850°.

The issue is repaired now, but consulting trend data now results in 'unreadable' graphs as the system scales to show the peaks.

In the era of mysql it was possible to remove those incorrect data entries from the trend database.

Is this possible on a cassandra system as well??

hans sanders [DevOps Advocate] Selected answer as best 27th August 2024
Marieke Goethals [SLC] [DevOps Catalyst] commented 27th August 2024

I see that this question has been inactive for some time. Do you still need help with this? If not, could you select the answer that has been most helpful for you (using the ✓ icon)?

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frans siew [SLC] [DevOps Advocate]919 Posted 24th June 2024 1 Comment

Hi Hans,

if the bad connection to the sensor leads to it showing the value: 850 consistently, it might be a ideal to add it as parameter exception value in the connector.  that way it won't mess up the average and max values if this occurs again

Regards,

hans sanders [DevOps Advocate] Selected answer as best 27th August 2024
Miguel Obregon [SLC] [DevOps Catalyst] commented 24th June 2024

Hi,
A good suggestion, but instead of checking if the value is equal to 850, I will check the specs of the temperature probe to determine the max temperature that the probe can measure.
With that information I will update the connector to set the value to ‘N/A’ whenever the temperature to be displayed is higher that the maximum temperature that the probe can measure.

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