Texas Wastewater Class B Practice Exam

Which devices can be used to determine the level of sewage in a lift station?

1. Ultrasonic sensors

2. Air bubbler, floats, electrodes, Acoustic

3. Pressure gauges

4. Temperature sensors

The correct answer is: Air bubbler, floats, electrodes, Acoustic

The selection of devices to determine the level of sewage in a lift station is essential for monitoring and controlling the wastewater flow. The option that includes air bubblers, floats, electrodes, and acoustic sensors represents a comprehensive approach to level measurement. Air bubblers can utilize pressure measurements based on the depth of sewage; as the level increases, the pressure exerted on the air bubble changes, indicating the sewage level. Floats are simple yet effective devices that rise and fall with the sewage level, activating switches that communicate the current level. Electrodes can measure the resistance or conductivity of the liquid, providing information on the sewage level based on the exposure of the probes. Acoustic sensors use sound waves to gauge the distance to the surface of the sewage, thus determining the level based on the echo of the sound waves. The other options, while they may be effective in specific contexts, do not completely encompass the types of devices commonly used in lift stations. Ultrasonic sensors, while notable for non-contact measurement, are only one type of level measuring device and do not capture the breadth of technology available. Pressure gauges are typically used for pressure measurement rather than direct sewage level monitoring and are less versatile for varied conditions. Temperature sensors are not suitable for directly measuring sewage levels, as