Determine if consumption meter has failed

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

Determine if consumption meter has failed
  1. 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