High accuracy current transducers
September 2013
Sensors & Transducers
LEM has introduced the LA 130-150 series of current transducers for use in motor drives, inverters, power supplies and general industrial applications. These printed circuit board (PCB) mounted devices share a common, compact case outline and measure nominal full-scale currents of 130 and 150 A. Drawing on LEM’s established expertise in closed-loop Hall Effect transducer technology, the LA 130-150 series offers highly accurate linear measurement at a very competitive price.
The LA 130-150 series measures DC, AC and pulsed currents, providing an output in the form of a current signal proportional to the measured (primary) current. Two conversion ranges – a factor of 1000 or 2000 – are offered, with two mounting styles. The transducers can be supplied with an open aperture through which the current carrying the primary current is routed or they can be supplied with a primary conductor that will connect direct to the host PCB. Within the 33,5(H) x 37(W) x 16(D) mm outline, the conductor aperture is a generous 13,5 x 10 mm. The LA 130-150 series is backward compatible with LEM’s prior-generation devices in form, footprint and function.
LA 130-150 transducers feature a wide maximum bandwidth of DC to 150 kHz (-1 dB point) and an accuracy of better than 0,5% at the primary nominal RMS current and at ambient temperature. Typical linearity error is ±0,1% at nominal current and the maximum offset temperature drift is ±0,46% of nominal current from -40 to 85°C. The closed loop Hall Effect technology results in zero insertion losses and a fast response time of less than 500 nsec.
The LA 130-150 series finds widespread application in variable-speed AC motor and servo motor drives; in static converters for DC motor drives; and for monitoring currents in battery-supply installations. It can also be used in uninterruptible power supplies, in specialist power supplies such as welding PSUs and in switch-mode power supplies, together with a wide range of other industrial, appliance and heating, ventilating and air-conditioning (HVAC) applications.
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