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'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 |
VFD Controlled Loads
SCR Controlled Loads
Switching Power Supplies and Electronic Ballasts