Applicable Systems
- Primary: AHU, RTU, MUA, ERV, BLR, CHLR
- Secondary: HP, FCU, UH
Description / Method
Generates an insight when meter data has null or negative values for a particular length of time {meter}. This rule has been designed for accumulating meter TLs and generates an insight when the meter reading shows a null or negative value for one or more times during the course of an hour.
Logic
Diagnosis / Recommended Action
- Please review meter configuration, and operation.
Message
Meter data shows negative or null values indicating that the meter might have failed – please investigate.
for every hour{
count # of samples with negative consumption
}
if( count > threshold) then Insight_Flag
Notes
All thresholds are adjustable. This rule could be used for any type of meters – for example, water, gas, electricity. The rule looks for null values using the “Missing sample value” feature in the Multiple Expression block [5]. It is recommended that this rule be applied to all consumption meters in the building.
Default Inputs: Threshold Negative Consumption Hourly Count: 1 Threshold Null Value Hourly Count: 1
Rule Template Type
- Insight Type: Fault Detection
- Trigger Type: Active High
Default Priority
High
Inputs
| Inputs | Units | Tags | Description |
|---|---|---|---|
| Accumulating Meter Consumption | kWh | meter | Accumulating Meter |
Constants
| Inputs | Units | Default Value | Description |
|---|---|---|---|
| Threshold Negative Consumption Hourly Count | count/hours | 1 | Threshold for # of samples with negative consumption |
| Threshold Null Value Hourly Count | count/hours | 1 | Threshold for # of samples with no consumption |
