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Logic Beach offers a variety of kW sensors to monitor and record AC power demand from single-phase three-wire and three-phase three or four wire electrical systems. Each sensor uses a split core current transformer (CT) and voltage sensing leads to monitor current and voltage which are used to calculate kilowatts. A 4 - 20mA output corresponds to a true RMS value. This mA output is sampled by any of the analog inputs available on Logic Beach data loggers and then converted to a kW value using a math function available in our software. Logic Beach data loggers are expandable and can monitor up to 44 kW sensors depending upon the data logger model and configuration.
Using our software, HyperWare, a user can write a program to integrate the demand over time to provide consumption (kWh) on an hourly, weekly, monthly time frame as well as total consumption. Hourly, weekly, and monthly periods are typical examples, but the 4 -20mA demand signal can be integrated over a user-defined time period as well. The flexibility of HyperWare will also let you write a program to monitor just work days or specific time frames as your application demands.
A sample application of this sensor is demonstrated in predictive maintenance monitoring. This new plant discipline is receiving more interest by many plant operators. Part of predictive maintenance is understanding the historic operational data from a particular plant system. As an example, the Department of Water and Power in Southern CA has some very large motors and pumps that are used to pump water from the desert over the mountains to water treatment plants around Los Angeles. If they were to monitor motor power along with bearing temperatures and flow rates they could gain an understanding of long-term motor and pump performance. Armed with this data a prediction could be made when bearings need attention or motors rebuilding in order to maximize output per kW consumed.
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