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Fluxgate technology shrinks CTs

2nd Quarter 2009 Other technologies

The CAS, CASR and CKSR family of PCB-mounted current transducers from LEM are intended for AC and DC isolated current measurement from 6 to 50 A rms nominal, up to three times the nominal values for the peak measurement and up to 300 kHz (±3 dB).

The new transducers have been specially designed to respond to the technology advances in drives and inverters, which require better performance in areas such as common-mode influence, thermal drift, response time, insulation levels and size.

To obtain this performance, closed loop Fluxgate technology has been used. This enables LEM to combine high accuracy and attractive price without compromising any of the advantages of the LTS family, such as size, dynamic performance and wide measuring range.

Although the new transducers are 30% smaller than the existing LTS family, their insulation performance allows use in industrial applications without a special PCB layout

All transducer models have been designed for direct mounting onto a printed circuit board for primary and secondary connections. They all operate from a single 5 V supply. The CASR and CKSR models provide their internal reference voltage to a VREF pin. An external voltage reference between 0 and 4 V can also be applied to this pin.

The CAS, CASR and CKSR family of transducers are suitable for industrial applications such as variable speed drives, UPS, SMPS, airconditioning, home appliances, solar inverters and also precision systems such as servo drives for wafer production and high-accuracy robots.

For more information contact Mervyn Stocks, Denver Technical Products, +27 (0)11 626 2023, [email protected], www.denvertech.co.za



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