Xpert Pro

The electrical power meter, Xpert is a micro-controller based unit which measures various electrical parameters, and sequentially displays on a 128X64 backlit LCD.

The unit measures the three phase voltages, currents, frequency, power factors, individual Harmonic data as Histogram including Total Harmonic Distortion as well as individual current and voltage waveforms for all three phases. Based on these inputs, the system KVA, KW and KWh can also be calculated.

For the correct operation of the unit, the only basic care required is to ensure that the phase sequence of the three phases is R-Y-B and the polarity of the CT secondary is correct.

The unit is fully solid state and will give years of trouble-free service once installed correctly.


  • Compact 96 X 96 X 55 mm
  • Graphical Display 128 X 64
  • Accuracy: Class 1.0 & Class 0.5 (Optional)
  • Odd Harmonics up to 15th of individual Voltage and Current waveforms including THD
  • RS485 port for Communication EMS/ PLC/ SCADA (Optional)
  • Dual Source Measurement (Optional)
  • Two Relays - individually programmable for Alarm/ Trip (Optional)
  • Histogram & Tabular display of Harmonic content
  • Wave shape display for all voltages & currents


Type Name Statistics
Input Supply Three Phases and Neutral of a 3P4W system / ThreePhases of a 3P3W system
Voltage Direct Voltage Input : 25 to 500V L-L, 20 to 300V L-N
PT Ratio : Site Selectable
Burden : 0.5VA
Current Secondary Current Input : 5A or 1A (Site Selectable)
CT Ratio : Site Selectable
Range of Reading : 5 – 5000A
Burden : < 1.0VA
Overload : 5A CT = 6A RMS Continuous
1A CT — 1.2A RMS Continuous
PowerSupply Auxiliary Supply : 80 - 480 VAC, 50-60 Hz.
Output Relay Two. Individually Field Programmable.5A @ 250 VAC, Resistive Load
MEASUREMENT True RMSBasicParameters Voltage(Volts L-N & L-L) VL-N - Accuracy : 0.5% of ReadingVL-L - Accuracy : 1.0% of Reading
Current(Amps IR, IY, IB) Accuracy : 0.25% of Reading
Line Frequency 45 to 55 Hz, Accuracy : 0.3% of Reading
Power Active Power (P) Accuracy : 1% of Reading(For IPFI>0.5)
Reactive Power (Q) Accuracy : 1.5% of Reading(Between 0.5 Lag to 0.8 Lead)
Apparent Power (S) Accuracy : 1% of Reading
Power Factor For Individual phases and System
Accuracy : 1.0% of Reading (IPFI=0.5)
Range of Reading : 0.05 to 1.00 Lag/Lead
Energy Total Active Energy (KWh) Range of Reading : 0 to 9999999.9
Accuracy : class 1.0S
Total Apparent Energy (KVAh) Range of Reading : 0 to 9999999.9
Accuracy : 1.0% of Reading
Total Apparent Energy (KVARh) Range of Reading : 0 to 9999999.9
Accuracy : 1.5% of Reading
PowerQuality Individual Wave form for each voltage and current
THD for each current and voltage in three phases
MISC. Dimensions Bezel 96 X 96 mm
Panel Cutout 90 X 90 mm
Depth of installation 55 mm
Display 128X64 LCD
Operating temp 10°C to 50°C
Weight 0.35 Kgs (Approx.)
Min. Operating Current 0.4% to 120% of CT primary
Comm RS485 Modbus-RTU protocol