NK Technologies ATR Series True RMS AC Current Transducers

NK Technologies

Key Features:

    True RMS Output
  • True RMS technology is accurate on distorted waveforms like VFD or SCR outputs
    Jumper Selectable Ranges
  • Reduces inventory
  • Eliminates zero and span pots
  • Output is magnetically isolated from the input for safety
  • Eliminates insertion loss (voltage drop)
    UL, CUL and CE Approval
  • Accepted worldwide
Product Options:

Secured and trusted checkout with

'ATR' transducers from NK Technologies combine a current transformer and a True RMS signal conditioner into a single package.  The ATR Series provides True RMS output on distorted waveforms found on VFD or SCR outputs, and on linear loads in “noisy” power environments. Available in a solid or split-core case.

Selecting the right transducer:  The current waveform of a typical linear load is a pure sine wave. In VFD and SCR applications, however, output waveforms are rough approximations of a sine wave.  There are numerous spikes and dips in each cycle. ATR transducers use a mathematical algorithm called "True RMS," which integrates the actual waveform over time. The output is the amperage component of the true power (heating value) of the AC current waveform. True RMS is the only way to accurately measure distorted AC waveforms. Select ATR transducers for nonlinear loads or in “noisy” power environments.

NK Technologies ATR Series True RMS AC Current Transducers, Jumper Selectable Input Ranges, 4 - 20 mADC Output

Output Signal 4–20 mA, Loop-powered, True RMS
Output Limit 23 mA
Accuracy 1.0% FS
Response Time 600 ms (to 90% step change)
Frequency Range 10–400 Hz
Power Supply 24 VDC nominal, 12–40 VDC max.
Isolation Voltage UL listed to 1270 VAC, tested to 5 KV
Input Ranges Field-selectable ranges from 0–200 A; custom
ranges available; consult factory.
Sensing Aperture • -FT Case: 0.74” (19 mm) dia.
• -SP Case: 0.85” (21.6 mm) sq.
Case UL94 V0 Flammability Rated
Environmental -4 to 122°F (-20 to 50°C)
0–95% RH, non-condensing
Listings UL 508 Industrial Control Equipment
(USA & Canada), CE
Write Your Own Review
Only registered users can write reviews. Please Sign in or create an account

VFD Controlled Loads

  • VFD output indicates how the motor and attached load are operating
  • SCR Controlled Loads

  • Accurate measurement of phase angle fired or burst fired (time proportioned) SCRs. Current measurement gives faster response than temperature measurement
  • Switching Power Supplies and Electronic Ballasts

  • True RMS sensing is the most accurate way to measure power supply or ballast input power