LEM’s IT current transducer family is designed for power electronics applications requiring high performance in accuracy, drift and response time, such as medical equipment (scanners, MRI, etc.), precision motor controllers, and metering or accessories for measuring and test equipment.
To achieve their elevated accuracy and performance levels, the transducers abandon the Hall effect in favour of closed-loop Fluxgate technology. The product range covers transducers for nominal current measurements from 12,5 A to 24 kA while providing overall accuracies at ambient temperatures of only a few ppm (parts per million).
Thermal offset drifts are between 0,1 to 6,7 ppm/K. Models from 12,5 to 60 A nominal can be used for PCB mounting, whereas models from 60 A to 24 kA
are intended for panel- and/or rack-mounting with either onboard or separate electronics. In addition, the Fluxgate technologies used provide galvanic isolation for current measurements of all types of waveforms including AC, DC, mixed signal or complex waveform.
Most of the IT transducers feature a round aperture which can accommodate primary conductors of various diameters according to the model used (except the ITN 12-P which uses an integrated primary conductor). In addition to their normal current or voltage outputs, these models offer an output indicating the transducer state (operational status) via normally-open or -closed contacts and an external LED (except the ITN 12-P and ITL 4000-S models).
ITZ models provide additional functionality with outputs indicating if the measured current is extremely low or high, or if the transducer is in overload, with each of these conditions being supported by a dedicated LED.
The ITB 300-S and ITL 4000-S operate in extended temperature ranges from -40°C to 85°C and -40°C to 70°C respectively, enabling their use in broader applications. Although the ITB uses the same technology as the other IT current transducers, it is positioned at a lower price while offering a level of performance slightly lower than the other models of the family.
These products are all equipped with an electrostatic shield built inside the case to ensure immunity against external interference; a shielded output cable and plug are advised to ensure maximum immunity.
IT models react very quickly to sudden changes in primary current thanks to their secondary windings working as an excellent current transformer. This feature allows wide bandwidths (up to 800 kHz @ -3 dB). These transducers are all CE compliant and also conform to EN 61010-1 for safety requirements.
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