Product category:
Sensors and Data Acquisition
News Release from: LEM UK | Subject: HTFS 200, 400 and 800-P
Edited by the Electronicstalk Editorial
Team on 18 November 2004
Novel ASIC aids current transducer
integration
LEM has added three models to its range of open-loop, ASIC-based current transducers that operate from a unipolar +5V supply.
LEM has added three models to its range of open-loop, ASIC-based current transducers that operate from a unipolar +5V supply The HTFS 200, 400 and 800-P models are PCB-mounted transducers for 200, 400 and 800A RMS nominal current measurement
This article was originally published on Electronicstalk on 22 Apr 2002 at 8.00am (UK)
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They share the same mechanical design, measuring 40 x 46 x 18mm and having a 22mm diameter aperture for the primary conductor.
The internal reference voltage (Vcc/2) is provided on a separate pin or can be forced by an external reference (between 2 and 2.8V) for reference thermal drift cancellation.
At Ipn, the HTFS output is equal to the reference used +/-1.25V (fixed gain).
If an external reference is not used, the initial offset is ratiometric and equal to Vcc/2.
Designed specifically for use in forklift truck drive control systems, two of these transducers typically monitor and measure the currents carried into two of the three phases of an AC motor to control the forklift speed.
As these transducers are intended for use with A/D convertors and microprocessors, they must be compatible, in terms of power supply levels, type of output signal to feed the microprocessor input, and references used without the need for additional components.
HTFS models meet this requirement by using a unique LEM ASIC, which also offers performance improvements, including better offset and gain drifts and linearity, in addition to an extended operating temperature range of -40 to +105C, compared with traditional discrete technology.
The transducers are CE marked, conform to the EN50178 standard and are recognised for industrial applications.
LEM Components offers a five-year warranty for each transducer.
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