• IMP Powers Limited

Kilowatt-Hour Meter

IMP Power offers a kilowatt-hour meter, suitable to measure the energy of single phase or 3-phase system balanced or unbalanced load in power industry. The measured energy is indicated by a 6-digit impulse counter in 'electro-mechanical display meter' or by 7-segmented 6-digit LED display provided on front side of the meter in 'LED display meter'. Flashing of 'On LED' provided on the fascia ensures energy counting, 'REV LED' glows in case of wrong wiring polarities or leading power factor or reverse power. Both these meters are provided with pulse output, and can be connected to a remote unit such as data logger, PLC, DCS, etc. On request, a port of RS-485 output can also be provided to interface with PC, SCADA, etc., using MODBUS RTU protocol for communication. It is possible to monitor 120 meters on a single network. The meter is provided with non re-settable counter and shroud on the terminals for sealing to prevent external tampering of wiring sequence. Two sets of 4 digits BCD switches are provided at the rear side of housing, one for selection of PT Ratio and another for CT Ratio. Working principle: the meter comprises of microcontroller and energy measuring IC. Energy measurement is based on the principle of integration of true RMS power with respect to time. Energy output is transmitted in terms of numbers of pulses. The microcontroller used in the meter converts these numbers of pulses into appropriate command to the counter for direct readout.