Split-core, high-current AC/DC transducers
June 2006
Sensors & Transducers
LEM is offering its AHR series of AC and DC current transducers that offer versatile and precise measurement of nominal currents up to 2 kA true RMS, extending the existing family that ranges from 100 A to 1 kA. These split-core transducers combine Hall-effect technology and signal conditioning in a compact case to offer significant size savings (a claimed 50% advantage over existing current transformers). They measure 174 x 86 x 54,1 mm.
Devices in the AHR series have been designed to measure DC signals as well as distorted current waveforms such as variable frequency drive (VFD) outputs. They offer a choice of primary current measurement ranges from 500 A to 2 kA, a choice of standard output types (4-20 mA, 0-5 V or 0-10 V), a wide power supply range (20 to 50 V d.c.) and large sensing apertures for non-contact measurement (104 x 40 mm bus bar, in addition to a 32 mm cable version.
The new transducers provide an absolute accuracy better than 1% of the nominal current over a broad range of inputs. This, coupled with a wide bandwidth from DC to 6 kHz, an operating range of -40 to +70°C and true RMS computation for non-linear loads or 'noisy' environments, makes them a suitable choice for industrial system designers, system integrators and automation distributors looking for accurate and cost-effective AC or DC current transducers.
As with all other LEM products, the AHR series products benefit from the company's proven high-quality approach to manufacturing and are backed by a five-year guarantee. Principal applications are expected to be in the monitoring of switching power supplies and electronic ballasts, main AC power supplies and large AC or DC motors.
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