Liquid levels can be measured using which of the following devices?

Liquid levels in wastewater systems are commonly measured using devices that provide accurate readings for the volume or height of the liquid. The correct choice refers to bubblers or sight tubes, floats or probes, and weirs and flumes, which are specifically designed to measure liquid levels effectively.

Bubblers utilize a tube to introduce air or gas into the liquid, and the pressure of the gas can indicate the liquid level, while sight tubes allow for a visual inspection of the liquid level against graduated markings. Floats or probes are devices that either float on the liquid’s surface or are submerged to give a level reading based on their position, often connected to electronic sensors for accurate data. Weirs and flumes are structures that measure flow rate based on the height of liquid flowing over or through them. They are engineered to provide a reliable measurement of liquid level that correlates to flow rates in open channels.

In contrast, the other options include devices that serve different functions. Thermometers and psychrometers measure temperature and humidity but do not measure liquid levels directly. Chlorinators and filters are used for chemical treatment and physical separation of solids, respectively, but they do not measure liquid levels. Similarly, magnetic flow meters are designed to measure the flow of a liquid through