Milwaukee, Wis. LEM has introduced the AHR series of AC and DC current transducers that offer precise measurement of nominal currents up to 2000-A true RMS, which extends the existing family that ranges from 100 A to 1000 A. 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 x 86 x 54.1-mm package, which is about a 50% 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 6 kHz, and true RMS computation for non-linear loads or "noisy" environments. The operating temperature range is -40° to 70°C.
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 (VFD) outputs. They offer a choice of primary current measurement ranges from 500 A to 2000 A, a choice of standard output types (4 to 20 mA, 0-5 V or 0-10 V), and a wide power supply range (20 to 50 Vdc).
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.
Pricing for the AHR series ranges from $147.20 to $163.60 for 100 pieces. Delivery is 11 weeks.
LEM, 1-414-353-0711, www.lem.com