Tennessee Wastewater Operator Practice Exam

What does a differential pressure sensor indicate in relation to an inlet air filter?

1. When the blower should be turned off

2. When maintenance is required on the blower

3. Early indication of a plugged air filter

4. Performance efficiency of the blower

The correct answer is: Early indication of a plugged air filter

A differential pressure sensor measures the pressure difference across the inlet air filter. As the air filter becomes clogged with dirt and particulates, the pressure difference increases because it becomes more difficult for air to pass through. This increase in differential pressure serves as an early warning sign that the air filter is becoming obstructed, indicating that maintenance may be needed to either clean or replace the filter. Addressing this situation promptly helps to maintain optimal airflow and system performance, thereby preventing potential damage to the blower and other components. This measurement is crucial for ensuring efficient operation, as a plugged filter can lead to reduced airflow, increased energy consumption, and possibly even equipment failure if not addressed in a timely manner.