Lem has introduced a family of current transducers that combines Hall-effect technology and a signal conditioner in a compact case to offer large savings in size (according to Lem, up to 75% compared to other current transducers) for measuring nominal currents up to 1000 A true RMS. These new transducers measure only 90 x 70 x 34 mm.
The DHR series has been designed to measure DC signals as well as distorted current waveforms such as variable frequency drive (VFD) outputs. Additional features include the choice of primary current measuring ranges from 100 A to 1000 A, choice of output options (4-20 mA, 0-5 V or 0-10 V), a wide power supply range (24 to 50 V d.c.) and a large sensing aperture (32 mm) for non-contact measurement.
The new transducers are claimed to provide an absolute accuracy of 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 a true RMS computation for non-linear loads or 'noisy' environments, makes them a very desirable choice for industrial system designers, system integrators and automation distributors looking for accurate and cost-effective AC or DC current transducers.
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