Zone Air Humidity sensor may be faulty

Objective/Method/Outcome

Objective: Determines if Zone Air Humidity sensor is faulty.

Method: Checks if the sensor is faulty by determining the changes in the value of the sensor for 120 consecutive hours or if the humidity is out of range for 120 consecutive hours.

Outcome: Triggers an insight when it determines the sensor is faulty.

Applicable System

VAV

Description

Sensor validation rule: Check for unreliable readings in range and quality. This rule is part of the CopperTree Standard rule-set.

Diagnosis

  1. Verify sensor exists.
  2. Verify sensor has power.
  3. Verify reading in BMS.
  4. Replace if the sensor is broken.

Message

The zone humidity sensor is reading outside reasonable range or is stuck on one value. This may negatively impact comfort or energy efficiency.

Rule Template

Insight Type: Fault Detection

Trigger Type: Active High

Default Priority

Low

Logic

Logic used to determine if humidity sensor is faulty

Inputs

Input Unit Tags Description
Zone Humidity %RH Room Humidity The recorded Zone Humidity
Zone Humidity Low Limit %RH The predetermined low limit for humidity
Zone Humidity High Limit  %RH The predetermined high limit of humidity
Weekly Insight Threshold  Hr This is the minimum number of hours the system should be at fault to trigger insight

Notes

Default Thresholds:

  • Humidity Low Limit [%RH]: 5%RH
  • Humidity High Limit [%RH]: 90%RH
  • Weekly Insight Threshold [hours]: 120 hours