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Transducers handle high AC and DC currents

Posted: 29 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:AHR? current transducer? LEM? Gina Roos?

LEM's AHR current transducer

LEM has introduced the AHR series of AC and DC current transducers that offer precise measurement of nominal currents up to 2,000A true rms, which extends the existing family that ranges from 100A to 1,000A. They also offer a large sensing aperture for non-contact measurement.

These AHR series split-core transducers combine Hall-effect technology and signal conditioning in a 174-by-86-by-54.1mm package, which is about a 50 percent savings in size when compared to existing transformers. The transducers provide an absolute accuracy better than 1 percent of the nominal current over a broad range of inputs, a wide bandwidth from DC to 6kHz, and true rms computation for non-linear loads or "noisy" environments. The operating temperature range is -40C to 70C.

Devices in the AHR series, which combine a Hall-effect sensor and true rms transducer in a single case, have been designed to measure DC signals as well as distorted current waveforms such as variable frequency drive outputs. They offer a choice of primary current measurement ranges from 500A to 2,000A, a choice of standard output types (4mA to 20mA, 0-5V or 0-10V), and a wide power supply range (20Vdc to 50Vdc).

Targeting industrial system designers, system integrators and automation distributors, key applications are expected to be in the monitoring of large SCR or switch-mode rectifiers, back-up batteries, main AC power supplies and large AC or DC motors.

The price range for the AHR series is from $147.20 to $163.60 for 100 pieces. Delivery is 11 weeks.

- Gina Roos

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