Massachusetts Wastewater Practice Exam

Which device can be used to monitor the head on a wastewater flow measuring flume?

1. Bourdon Tube

2. Pygmy meter

3. Ferraris meter

4. Ultrasonic meter

The correct answer is: Bourdon Tube

A Bourdon tube is a mechanical device that measures pressure or head based on the deformation of a curved tube. In the context of monitoring head in a wastewater flow measuring flume, the Bourdon tube can be effectively used because it provides a direct and accurate measurement of the pressure exerted by the liquid column above it. As the head in the flume changes, the pressure varies, which leads to the deformation of the tube. This deformation can be translated into a measurement of head, allowing for precise monitoring of flow conditions. The other devices, while useful in various applications, do not serve this specific purpose as effectively. Pygmy meters and Ferraris meters are primarily designed for measuring flow rather than directly monitoring head. Ultrasonic meters, on the other hand, utilize sound waves to measure fluid levels and flow rates, and while they can indirectly determine head by measuring level, they do not function in the same manner as a Bourdon tube, which provides a direct measurement of pressure derived from the head of liquid.