In a recent BERMAD webinar on Smart Metering with Electromagnetic Flow Meters, Elad Orenstein, Smart Metering Product Manager talked about the benefits of using electromagnetic flow meters in collecting accurate data and making it available anywhere, anytime.
During the webinar, questions regarding deployment of electromagnetic flow meters and various technical issues were addressed.
Q: Is this technology readily available for municipal water supply?
A: Yes, electromagnetic flow meters are being deployed in many municipal network applications around the globe.
Q: Why do we need to install two grounding rings?
A: Electric noise can emanate from upstream or downstream. In order to ensure we've applied sufficient noise filtration, we recommend installing two grounding rings — one on each side of the meter.
Q: Will fluctuations in the conductivity of the measuring fluid affect measurement accuracy?
A: Fluctuations in conductivity do not affect the measuring performance dramatically as long as the conductivity remains higher than the minimum recommended value (5 uS/cm).
Q: What's the difference between full bore and reduced bore in terms of design and operation?
A: Reduced bore meters allow much higher accuracy on low flows and eliminate the need for straight pipes (5D-3D) upstream and downstream.
Q: What is the minimum pipe diameter to enable use of an insertion flow meter?
A: DN50 to DN2600, respectively 2" to 104".
Q: How accurate are insertion meters, assuming they've been properly installed?
A: Typically, the accuracy of an insertion meters is 2%.
Q: What are the main advantages of electromagnetic metering versus ultrasonic metering?
A: The main advantages are: no maintenance (ultrasonic meters get dirt on the transducers, so filters need to be installed); no issues with vibration; long lasting accuracy; wide variety of inputs and outputs; and different power supply, to name a few.
Q: To what extent do air bubbles (two phase liquid-vapor) influence readings?
A: One should always aim to avoid gasified liquid. The less air the better; which is another great opportunity to recommend using BERMAD air valves.
Q: Can multiple meters be used on one site, or will the data get corrupted?
A: Since each sensor is connected to a dedicated converter, several meters can be installed on one site without causing any issues.