LEM has introduced the ITZ series of transducers for galvanically-isolated, ultra-accurate precision DC, AC and pulsed current measurements in industrial and laboratory applications.
The high-accuracy product range comprises a series of transducers for nominal current measurements from 600 A to 24 kA, that provide overall accuracies at ambient temperature (25°C) of only a few ppm.
To achieve such high accuracy at very high current levels, LEM used closed-loop fluxgate technology, which the company has developed extensively in recent years. This provides initial offset error of under 2 ppm, linearity in the range of 1 to 10 ppm, and low thermal drift of 0,1 to 0,6 ppm/K.
The transducers deliver measurements as an output current or voltage, as well as outputs indicating the transducer state. Indications include whether the transducer is operational or not, if the measured current is extremely low or high, or if the transducer is in overload condition – each state being signalled via normally-open or -closed contacts, with each of these conditions supported by a dedicated LED. Further operational information, regarding the measuring head range that is in use, and about the status of the power supply, is also indicated by an LED.
600 A and 2000 A models are available as programmable units with either current or voltage outputs (from 40 A to 620 A in steps of 20 A for the 600 A model, and from 125 A to 2000 A in steps of 125 A for the 2000 A model).
ITZ series transducers have very low output noise and bandwidth varying from 2 to 500 kHz (±3 dB) according to the model.
The transducers tolerate substantial overload currents (to over 30 kA in the case of the highest-rated unit) for up to 100 ms. They are powered by standard AC mains supplies of 100–240 V a.c., 50/60 Hz and operate over a temperature range from 0°C to +55°C for the measuring heads and from +10°C to +40°C for the electronics rack.
Transducer measurement heads are self-contained in their own casing, and the signal processing and measurement circuitry is mounted remotely in a 19” rack unit. The parts are all equipped with an electrostatic shield built inside the case to ensure the highest level of immunity against external interference. They are available in 14 models comprising different measuring heads of various dimensions with apertures from 25,4 mm up to 150,3 mm diameter covering the full range of measured currents.
Their high accuracy makes the transducers ideal for use in a broad array of applications such as laboratories, measuring and test equipment, power analysers, high-precision high-stability power supplies, calibration units, absolute current standard reference, and differential current measurement on power lines.
They are all CE compliant and conform to EN 61010-1 for safety requirements. LEM has ISO 9000 and ISO TS-16949 qualifications globally (ISO 9001:2008 at the Copenhagen, Denmark production and design centre) and offers a five year warranty on all of its products.
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