Objective/Method/Outcome
Objective: Determines if the airflow was reaching setpoint
Method: Compares the recorded airflow to the setpoint to detect if the airflow is below the acceptable threshold (10% by default) for more than the acceptable amount of time during occupancy.
Outcome: Generates an insight.
Description
Fume hood airflow is unable to reach setpoint, which may have negative health and safety implications.
This rule is part of the CopperTree Standard rule-set.
Default Priority
High
Diagnosis
- Check fumehood control and programming logic.
- Review airflow sensor calibration.
Message
Fume hood airflow is below setpoint, which may have negative health and safety implications.
Rule Template
Insight Type: Fault Detection
Trigger Type: Active High
Logic
Inputs
| Input | Unit | Tags | Description |
|---|---|---|---|
| Fume Hood Exhaust Airflow | Exhaust Air CFM | The recorded fume hood airflow | |
| Insight Threshold – Allowable Hours | The minimum amount of time that the airflow can be below setpoint to trigger insight | ||
| Fume Hood Exhaust Airflow Setpoint | Exhaust Air CFM Setpoint | The exhaust air airflow setpoint | |
| Fume Hood Status | Fume Hood Occupancy | The status of the fume hood | |
| Airflow Threshold | % | The acceptable % decrease from setpoint |
Notes
Default Thresholds:
- Airflow Setpoint Threshold: 10%
- Threshold – Weekly Acceptable Hours: 8
