NK AT3-420-24L-FL - AC Current Transducer, AT/ATR-FL Series

• AT/ATR-FL series
• AC current transducer
• Measurement = Average Responding
• Full Scale Range = 375, 500, 750 A
• Output signal = 4-20 mA
• Power supply = 24 VDC loop-powered
• Case style = solid-core

AT/ATR-FL Series AC Current Transducers combine a current transformer and a signal conditioner into a single package for applications from 100 A to 2000 A. The AT version is Average Responding for use on linear (sinusoidal) loads. The ATR version is True RMS for use on distorted waveforms found in VFD or SCR outputs. The AT/ATR-FL Series AC Current Transducers are available in a solid-core case.

AC Current Transducer Applications

Large Pumps

• Detect dry run electronically.

• Measure the output of generators.

• Monitors heater loads.
• Faster response than temperature sensors

AC Current Transducer Features

Large Aperture

• Accommodates large conductors or wire bundles.

• True RMS technology is accurate on distorted waveforms like those associated with VFD or SCR outputs.
• Average Responding for use with linear, sinusoidal waveforms.

• Reduces inventory.
• Eliminates zero and span pots.

• Output is magnetically isolated from the input for safety.
• Eliminates insertion loss (voltage drop).

• Accepted worldwide.

Selecting the right transducer:

The current waveforms of a typical linear load is a pure sine wave. AT transducers measure the peaks of these sine waves, then calculate the average amperage. This works well on constant speed linear loads in "clean" power environments. Select AT transducers for strictly linear loads on "clean" power. VFD and SCR output waveforms are rough approximations of a sine wave. There are numerous spikes and dips in a mathematical algorithm called "True RMS," which integrates the actual waveforms over time. The output is the amperage component of the true power (heating value) of the AC current waveforms. True RMS is the only way to accurately measure distorted AC waveforms. Select ATR transducers for nonlinear loads on "noisy power."

AC Current Transducer Ordering Information

Sample Model Number: ATR3-420-24L-FL

True RMS AC current transducer, 24 VDC, powered with a 4–20 mA output, 375/500/750 A ranges in a solid-core case.