What flow measuring device is not typically used in wastewater applications?

The thermal mass flowmeter is not typically used in wastewater applications due to its specific design and operating principles. This type of device is primarily intended for measuring the flow of gases based on the thermal properties of the medium. In the context of wastewater treatment, the primary focus is on liquid flow measurements, which require devices that can handle the properties of water, including its density, viscosity, and potential particulate content.

In contrast, devices like magnetic flow meters, V-notch weirs, and Parshall flumes are commonly utilized in wastewater settings. Magnetic flow meters are effective for measuring conductive liquids, such as wastewater, as they utilize electromagnetic principles to determine flow rate without the obstruction of moving parts. V-notch weirs are used for open channel flow measurements and can provide accurate readings of flow in various conditions often found in wastewater applications. Parshall flumes are also designed for open channel flow measurement and can be used in diverse circumstances for both accurate and reliable flow rate calculations.

Thus, the thermal mass flowmeter's unsuitability for wastewater applications stems from its focus on gaseous flow, making it less applicable within the context of liquid flow measurement required in these settings.