Powertek Logo
UK Office:
US Office:

PH-3A and PH-1000 Power and Horse Power HP Transducers

Active Power, Horse Power (HP) and Current Sensing for Variable Speed Motors and Wide Ranging AC/DC Loads

Power Transducers
  • Power Cells are stand-alone power transducers
  • Ideal for Machine Tool, obstruction sensing and Viscosity
  • Analog output proportional to power (HP horsepower or watts kW)
  • Self-contained power transducer, no current or voltage transformers
  • Versatile, works with both fixed and variable frequency power
  • Optional 230V and 460V power available
  • Adjustable response 0.06 to 1sec, standard 15ms
  • Non contact current connection
  • Certified to NIST and UKAS

HP and Power Transducers - General Information

Fast Response PH-3A Power Cell
power cell
  • Ideal for machine tool applications
  • Monitor fast load changes
  • Self-contained – No PTs or CTs to install
PH-1000 Power Cell for Large Loads
power cell
  • Monitor motors up to 1000HP
  • 1-3/4" conductor openings
  • No PTs or CTs to install


powertek uk
Full Scale Capacity 460 Volt Network
Model Full Scale kW Scale
PH-3A-HHG 2HP 1.5
PH-3A-HG 4.5HP 3.3
PH-3A-10 10HP 7.5
PH-3A-15 14HP 10.4
PH-3A-20 21HP 15.7
PH-3A-30 32HP 23.9
PH-3A-40 43HP 32.1
PH-3A-50 53HP 39.5
PH-3A-60 64HP 47.7
PH-3A-70 75HP 56
PH-3A-80 85HP 63.4
PH-3A-90 96HP 71.6
PH-3A-100 107HP 79.8
PH-3A-350-140 149HP 111.2
PH-1000-100 102HP 76.1
PH-1000-200 213HP 158.9
PH-1000-300 320HP 238.7
PH-1000-400 427HP 318.5
PH-1000-500 533HP 397.6
PH-1000-600 640HP 477.4
PH-1000-700 747HP 557.3
PH-1000-800 853HP 636.3
PH-1000-900 960HP 716.2
PH-1000-1000 1067HP 796


** NOTE: The Current Networks do not limit the current. They provide the Full Scale Power calibration point (HP or KW). The Power Cell is not damaged by overloads.

For Voltage Networks Other Than 460 Volt Multiply Full Scale HP by:
115 Volts .25
185 Volts .4
230 Volts .5
255 Volts .55
380 Volts .83
415 Volts .9
580 Volts 1.26
For Small Loads:

The capacity can be reduced by taking additional "turns" with the wire through each hole for each phase.

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.

Outputs Available:

0-1mA, 4-20mA, 0-5 Volts, 0-10 Volts the output is powered by the Power Cell

To Order:

Specify Model Number, Network Voltage (if not 460 Volts) instrument power and output.

Power Sensors

You can understand the loading on an electric motor by measuring the electric current flowing to the motor (Amps rms). Typically this is not the best method since a lightly-loaded motor doesn't use the electricity very efficiently. In technical terms, the power factor is low

A better technique to understand the load is to measure the motor power, measured in Horsepower HP or Kilowatts (W). Motor power has a straight line relationship, so it works well even when the motor is lightly loaded.

Our PH Power Sensors measure the motor load (Horsepower or Watts) and send an analog signal to meters, Data Acquisition equipment, computers and PLCs. This way, the operator can see motor load status, the computer can make decisions.

The typical way to measure power is fairly complex. However, our PH Power Sensor gives users a simple accurate solution.

Load Controls

A PH power sensor measures motor power in kW, however, in addition, it has built-in relays and set points. The user can adjust the set point so that when the motor load reaches the set point, a relay will trip. The relay acts as a switch and is used to turn off the machine, sound an alarm, control other processes or adjust the machine feed rate.

why monitor