Compact, high current Hall transducer

July 2005 Sensors & Transducers Infrastructure Security Services & Risk Management

LEM is offering a family of current transducers that combines Hall effect technology and a signal conditioner in a compact case to offer significant savings in size (up to 75% compared to other current transducers) for measuring nominal currents up to a true 1 kARMS. 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 1 kA, choice of output options (4 to 20 mA, 0 to 5 V or 0 to 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 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 an excellent 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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