Whole House Energy Monitor - Stationary - Promolife - Promoting a Healthier Lifestyle: "The EM2500 Meter Reader is a two channel Energy Monitor. It tracks and records the True Power consumed by an electrical load. The term 'load' represents an appliance, a machine, a lighting circuit or any electrical device which consumes electrical power. In order to derive true power the Energy Monitor requires real time access two two parameters:
1. The voltage (volts supplied to the load) and
2. The current (amperes) flowing through the load.
In order to access these parameters from a powered load, the EM2500 uses a non-intrusive and safe method:
1. The EM2500 reads the line voltage via the supplied AC wall transformer adapter. The low voltage secondary AC signal from a wall transformer is proportional to the line voltage. With this technique, there is no need to connect to dangerous voltage levels."
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