Monitor motor power in watts with DUAL analog outputs for meters, programmable controllers, chart recorders
Adjust full scale to match your motor – Max. sensitivity from small motors clear up to 150HP
Self-contained – No PTs or CTs to install
Versatile – Works on both Fixed and Variable Frequency, even Single Phase and DC
Special Purpose kW Power Sensor
For wires up to 0.9″ (23 mm) diameter
Nearly 50% more area than a standard UPC
UPC Three Phase Power Sensor specifications
0.5% Full Scale
Full Scale Capacity
5HP** to 150HP
5HP to 150HP larger 0.9" holes
3KW** to 100KW
4-20mA, 500Ω max connected impedance
0-10V DC 2000Ω minimum load
Relay: 30V, 5mA mx, 50ms duration pulse
3KW** to 100KW
0.5 Sec to 12 Sec
.050 Sec to 1.2 Sec
KWH, KWM, KWS
3Hz to 1kHz
6VA at 120V
1VA at 230V
*Specifications same as UPC unless noted
**For smaller motors take extra "turns" (Example: A 10HP unit is reduced to 5HP by taking two turns through each hole. It is reduced to 3.33HP with three turns, etc.
The UPC Power sensors use balanced Hall Effect Sensors
Sensitive at low and high frequencies
Senses distorted waveforms
Accuracy is improved by eliminating the large phase shift errors from the CT's and PC's at low power factors
Balanced Hall Effect sensors are used to measure power in kW and HP with non sinusoidal shapes and frequencies (like VFD Variable Frequency Drive). A Hall Effect sensor has these 2 characteristics:
It detects a magnetic field which is proportional to the current flowing through the conductor
The Hall Effect semiconductor can multiply two signals. Each Hall Effect Sensor is powered from voltage measured in each phase. The Hall device multiplies these voltage and current signals in real time
Specify Model Number, (Voltage Network if not 460 Volts) and output type (like 4-20mA)
0-1mA, 4-20mA, 0-5 Volts, 0-10 Volts the output is powered by the Power Cell
UPC kW and Power Sensors
You can assess the kW load on an electric motor by measuring the electric current flowing to the motor (Amps). Typically this is not an ideal way since a lightly-loaded motor does not use the electricity very efficiently. In other words, the power factor is low.
A better way to understand the load is to measure the electrical motor power, measured in Horsepower or Watts. Motor power has a straight line relationship, so it works well even when the motor is lightly loaded.
Our UPC Power Sensors measure the motor load (Horsepower or Watts) and send an analog signal to meters, data acquisition equipment, computers or PLCs. Using this method, the operator can see load status allowing the controlling PLC or computer to make decisions.
The typical way to measure power, with non sinusoidal wave shapes is fairly complex. However our CE marked UPC range of Power Sensors offers customers a simple solution.
A Powertek UPC Power sensor measures motor power in kW. In addition, it has built-in relays and set points, which means the user can adjust the set point, if the motor load reaches the set point, a relay will trip. The relay acts as a switch and is used to turn on/off the machine, sound an alarm, or adjust the machine feed rate.