PCB-mounted current transducer
February 2005
Sensors & Transducers
LEM has introduced the HFIS 40-P and HFIS 70-P flat, PCB-mounted current transducers. The units operate from a single +5 V supply, measure only 22 x 20 x 8,7 mm and are designed for nominal current measurements of 40 and 70 ARMS.
The transducers will accept two types of primary conductor: either a round cable of 4,6 mm diameter or a bus bar measuring 7,2 x 2,6 mm. Both models have the same pin-out and are intended for a wide variety of low-voltage applications.
Offset (at no primary current) and gain are ratiometric. The initial offset is equal to Vcc/2 and the gain is defined as VCC/5 x 0,64 V for 40 A (for the HFIS 40-P) and Vcc/5 x 0,7 V for 70 A (for the HFIS 70-P). Both directly depend on power supply variations.
The rated single insulation voltage is 100 VRMS when fully using the round aperture and 150 VRMS when fully using the rectangular aperture (conditions: OVIII and PDII) according to EN 50178. This insulation can be improved by using an isolated cable or bus bar. The use of a unique LEM ASIC provides better offset and gain drifts, linearity and an extended operating temperature range of -40 to +125°C. The transducers are CE marked, conform to the EN 50178 standard and are recognised for industrial applications. LEM Components offers a five-year warranty for each transducer.
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