Model# W4

AC Watt/Watt Hour Transducer

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Detailed Model Specs

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Voltage: See Tables
Current: See Tables
Frequency Range:
W: 48 to 70Hz
W4: 400Hz

Power Factor: Any
Response (Transient 90%):
With Internal sensors:< 100 µs
With Current transformers: 1 ms
Voltage and Current: 1.25VA/phase
Output amplifier: 2 Watts
Current Overload (Continuous):
1-10A: 2 X F.S.
15A, 20A, 25A: F.S.
Dielectric Test: (Input/Output/Case)1500Vac (RMS)
Surge: Withstands IEEE SWC test
Instrument Power: 103-135Vac, 50-400 Hz,5VA
“-22” Option: 230Vac, 50/60Hz, ±10%
Self Powered: Inst. Power Not Required


ACCURACY: ±0.5% F.S.
Includes combined effects of power factor, linearity and repeatability.
WH Relay: N/O SPST; 150Vac, 0.5A Rated
Contact Closure Period: 200 ms
Analog Output Ripple: < 1% F.S.
Output Loading (O):
4-20mAdc: 0-500
0-±1mAdc: 0-10K
0-±10Vdc: 2K min.
0-±5Vdc: 2K min.
***Response Time (90%): 250 ms
Field Adjustable Cal: ±10%
Temperature Range: -10°C to +60°C
Temperature Effect: ±1.0% of Rdg., ±0.1% F.S. Output
Optional 5V Pulse:
TTL output for watthours 5Vdc pulse add suffix “-T” to part number.

  • Measurement of power consumption.
  • Can be easily integrated into building management systems.
  • Pulse outputs interface with electronic or mechanical counters for accumulation of Watt Hours.
  • Accurate regardless of variations in voltage, current, power factor, or load.
  • Standard Analog outputs for Watts, relay contact or 5V pulse for Watt Hours.
  • Factory calibrated, traceable to NIST.