Electromagnetic flowmeters, also known as magnetic flowmeters or magmeters, use Faraday’s Law of Electromagnetic Induction to determine the flow of liquid in a pipe. In an electromagnetic flowmeter, a magnetic field is generated and channeled into the liquid flowing through the pipe. Following Faraday’s Law, flow of a conductive liquid through the magnetic field will cause a voltage signal to be sensed by electrodes located on the flow tube walls. When the fluid moves faster, more voltage is generated. Faraday’s Law states that the voltage generated is proportional to the movement of the flowing liquid. The electronic transmitter processes the voltage signal to determine liquid flow.
In contrast with many other flowmeter technologies, electromagnetic flowmeter technology produces signals that are linear with flow. As such, the turndown associated with magnetic flowmeters can approach 20:1 or better without sacrificing accuracy. Continue reading “How Electromagnetic Flowmeters Work”
There are a wide variety of technologies that can be used for fluid flow measurement, such as differential pressure, paddlewheel, electromagnetic, and ultrasonic. Furthermore, each technology has multiple installation configurations. It is important to understand the nuances of different technologies and installations in order to pick the right flowmeter for your application.
When purchasing a flowmeter for an HVAC application, such as boiler feed water monitoring or chilled/condenser water monitoring, we found that our customers value the ability to hot-tap (or pressure tap) a pipe to install an insertion flowmeter. This is done by installing an isolation valve in a pipe, allowing an insertion flowmeter to be placed into and removed from a live system without having to drain it. Draining a system is time consuming, costly, and generally not a good option for HVAC systems in buildings because it requires the entire system to be shut down. Permanently installing a hot-tap valve followed by an insertion flowmeter (with hot-tap capability) is an ideal alternative to a costly inline meter.
When considering an insertion flowmeter for an HVAC application, there are four key sources of error to be aware of: Continue reading “How the Dwyer Series IEF and IEFB Overcome Typical Sources of Error”
We recently met with a customer in India who needed to replace a flowmeter in an Energy Monitoring System (EMS) application in a commercial shopping mall.
Energy Monitoring Systems (EMS) continuously monitor and record chiller operating data. The EMS utilizes flowmeters installed in each chiller to measure flow. Temperature sensors are located in the inlet and outlet of the evaporators and condensers. A kWh meter measures the power consumption of each chiller. The data from each of these devices is collected and recorded within the control panel, which is then sent to a report generated in the cloud. This kind of system can accurately report the data used to manage energy and operating costs.
Because the space was occupied, the application couldn’t be shut down for maintenance or repairs. This meant that we needed to look into alternative solutions that wouldn’t affect system operations with unnecessary downtime. Continue reading “Flowmeter Used in an Energy Monitoring System Application”
Even before the AHR Expo officially opened to general attendees on January 22nd, guests of Dwyer Instruments were part of a highly anticipated release and demonstration of the Insertion Electromagnetic Flow Transmitter at the company’s booth. More than a dozen individuals from the HVAC industry experienced the features and benefits of this new magmeter firsthand. Continue reading “Dwyer Releases the New Insertion Electromagnetic Flow Transmitter at AHR Expo 2018”
With the release of the Insertion Electromagnetic Flow Transmitter, Dwyer Instruments, Inc. provides performance, accuracy, and reliability with same day field configurability.
Previously, insertion flow transmitters on the market did not offer much flexibility to configure products in the field. Dwyer addressed these concerns, delivering a solution with their new unit. Continue reading “There’s No Time for Downtime | Insertion Electromagnetic Flow Transmitter”