For important process controls, water utilities rely on accurate and trustworthy flow measurements called flow metres or flow indicators. Regulatory authorities also demand flow monitoring and reporting with accuracy requirements.

Flow metering technology is always evolving, and there are many different types and designs of metres available. Each flow metre application is distinct; therefore flow metre, and flow switch selection should not be made just based on "low bid." While price is always a consideration, there are other variables to consider when choosing a flow metre.

Here are five key factors to consider when selecting the best flow metre-

1. Understand the procedure- It's critical to understand the entire process and where the metre fits into it before defining a metre. Make sure to include plant operators in the design process to explore maintenance, calibration, and access challenges.

2. Measurement of the media- One of the most crucial factors to consider when selecting a flow metre is the media being monitored. Certain types of flow metres are affected by conductivity, temperature, pressure, and viscosity. The type and design of the metre depending on how clean or polluted the water is. The next stage in selecting a flow metre is to fully comprehend the flow characteristics to be monitored. The data on the matrix should be easily accessible in an existing facility. If necessary, standard engineering criteria can be applied to new facilities.

3. Requirements For Accuracy, Range, and Certification- How precisely does the flow measurement have to be? This depends on the metre's intended use. Flow measurements for controlling chemical feed may require more precision than flow measurements for general tracking of water treated. For billing purposes, such as when a water supply authority sells water to a utility, flow measurement must be exceedingly precise.

4. Installation and placement of metres- Flow metres must be installed and placed correctly to provide reliable measurements. If put incorrectly, even the best metre will read incorrectly. When trying to "push" a flow metre into an existing plant or network or squeeze it into a confined space, improper installation is most common.

• Flow Disturbances- To avoid flow disruptions, most flow metres require a specific amount of straight run pipe. Pipe bends, valves, tees, and reducers can cause large flow measurement errors, up to 50% for some metres.

• Piping- The metre selection equation included pipe size, material, and direction. 

1. Data collection/Reporting- What information should be recorded and monitored, and how should it be done? Some applications necessitate continuous flow recording as well as total flow measurements. Do operators require event notification, such as alarms for high or zero flow? Frequently, data must be transferred to a SCADA system. Flow metres are sometimes positioned in remote locations and require battery-powered devices.