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LEM

  • Chemin des Aulx 8 Plan-les-Ouates/Genève
    CH-1228
    Switzerland
  • +41 (22) 706 1257
  • www.lem.com

LEM Articles

Displaying 1 - 20 of 70
Sensors
10th December 2019
High isolated sensors range completed with included current conductor

LEM has expanded its range of miniature, integrated circuit sensors range for AC and DC isolated-current measurement with the introduction of the HMSR series. Despite their small size, the components can handle overload current bursts of up to 20 kA (8-20µs surge test profile), such as those that occur in photovoltaics applications while still providing a reinforced isolation. Products in the series are designed to measure currents of up to...

Analysis
26th November 2019
Rogowski coils for easy outdoor installation with Accuracy Class 0.5

LEM has announced the development of the Rogowski coils range to measure current up to 300,000A AC with accuracy class 0.5. The ARU range achieves IEC 61869-10 class 0.5 without the need for additional components such as resistors or potentiometers to calibrate the coil, which can drift over time.

Sensors
26th November 2019
High isolated current sensors with current conductor

LEM has expanded its range of miniature, integrated circuit sensors range for AC and DC isolated-current measurement with the introduction of the HMSR series. Despite their small size, the components can handle overload current bursts of up to 20kA (8-20 us surge test profile), such as those that occur in photovoltaics applications while still providing a reinforced isolation.

Sensors
11th October 2019
Closed-loop current sensors achieve offset drift down to 3ppm/°C

The latest closed-loop Hall effect current sensors deliver the added performance of fluxgate sensors without the added cost.  LEM have recently launched six separate families of LxSR sensors called LXS, LXSR, LES, LESR, LKSR, LPSR.

Automotive
20th August 2019
Keeping trains moving; meeting new technology demands

A key element of the propulsion system for low speed urban transportation to high speed intercity trains is the traction converter that transforms the power from the power source, whether a catenary or diesel engine, to drive the electric motors.  By Michel Ghilardi, LEM Research & Development Senior Engineer

Power
6th December 2018
Fast and accurate isolated current measurement with mini transducers

A fast measurement speed, achieved within tight cost and size constraints while integrating the primary conductor in SO packages without compromising the necessary insulation, is often as critical as the other high performances for current measurement in motor-drive applications. That is why LEM’s GO miniature transducers have been designed to achieve a 2µs response time from 2 standard, cost-effective SO8 or SO16 packages for nominal...

Sensors
13th November 2018
Simplify energy monitoring with high-accuracy sensors

LEM's ART Rogowski current sensor measures currents of up to 10000A AC and beyond. The ART achieves IEC 61869 Class 0.5 accuracy without the need for additional components which can drift over time. The ART benefits from 'Perfect Loop' technology, a patented coil clasp that eliminated the inaccuracy caused by sensitivity to the position of the conductor inside the loop, as well as providing an innovative, robust and fast 'Twist and Click' Closure...

Power
13th September 2018
Next-gen closed loop current transducers achieve offset drift

  The latest closed-loop Hall effect current transducers deliver the added performance of fluxgate transducers without the added cost. LEM have recently launched six separate families of LxSR transducers called LXS, LXSR, LES, LESR, LKSR, LPSR. 

Test & Measurement
19th June 2018
Fast and accurate isolated current measurement with mini transducers

A fast measurement speed, achieved within tight cost and size constraints while integrating the primary conductor in SO packages without compromising the necessary insulation, is often as critical as the other high performances for current measurement in motor-drive applications. Therefore LEM has introduced the GO miniature transducers, which have been designed to achieve a 2µs response time from 2 standard, cost-effective SO8 or SO16 pack...

Power
6th June 2018
Range of transducer’s dedicated to leakage current in PV inverters

  The LDSR model from LEM announced at PCIM 2018, is a low cost and lightweight (25g) component, with a reduced footprint. The LDSR is dedicated to measuring the leakage current of 300mA nominal up to 900mA peak at 2KHz frequency.

Power
6th June 2018
Open loop current transducers feature 10MHz clock frequency

  At this year's PCIM show, LEM has announced the completion of its digital output versions of HO and HLSR open-loop hall effect current transducers with analogue to digital (A/D) conversion performed by an on-board sigma-delta modulator, giving a 1-bit serial bitstream output.

Test & Measurement
5th June 2018
Making the voltage measurement more compact

The new DVC 1000-P model for insulated nominal voltage measurements in traction and industrial applications has been announced by LEM. This device measures a nominal voltage of 1000 VRMS and incorporates isolating amplifier technology.  Despite achieving very high levels of isolation with a safety insulation voltage of 4.2kV, the DVC 1000-P transducer is really compact, measuring only 37x43x23.5mm and can be mounted on printed board for a to...

Sensors
5th June 2018
Fluxgate-based current sensors for high accuracy measurement

LEM has expanded its range of high accuracy transducers with the new IN 1000-S for non-intrusive and isolated measurement of DC, AC and pulsed nominal current of 1000 A. LEM already launched a 2000 A model last year as first model of this range reinventing the fluxgate technology.

Power
20th March 2018
Next-gen transducers achieve offset drift down to 3ppm/°C

  The latest closed-loop Hall effect current transducers introduced by LEM deliver the added performance of fluxgate transducers without the added cost.

Power
12th February 2018
The ART of keeping utilities reliable and efficient

  New line current sensors allow utilities to monitor their overhead distribution lines to maximise their capacity and prevent clearance violations, explains Patrick Schuler, LEM  

Power
16th May 2017
Surface mount isolated current transducers have an integrated current conductor

PCIM Europe 2017: LEM introduces the GO series, expanding its miniature, IC transducers range for AC and DC isolated current measurement up to 300kHz.

Power
5th May 2017
How fluxgate technology drives innovation

The use of fluxgate technology in transducers for precise current measurement is well-known. Now, technology innovations take fluxgate current transducers to previously unattainable performance levels, says LEM Europe LEM Europe at PCIM Europe 2017: Stand 9-204

Sensors
9th February 2017
Thin and flexible coils look to empower smart cities

LEM has upgraded its 'ART' Rogowski current sensor so that it measures current of up to 10,000A AC and beyond with class accuracy 0.5. The ART achieves IEC 61869 Class 0.5 accuracy without the need for additional components like resistors or potentiometers, which can drift over time. 

Test & Measurement
21st September 2016
Compact transducer with new improved accuracy

Designed for insulated nominal voltage measurements in traction applications is the DVM series from LEM. This family of devices spans the range from 600-4200 VRMS and incorporates LEM’s proven and patented insulating technology. Despite achieving very high levels of isolation with a safety insulation voltage of 12kV, the DVM transducer is compact, measuring only 138x63.4x69mm.

Power
2nd August 2016
Isolated current transducers integrate current conductor

Designed for AC and DC isolated current measurement up to 100KHz, the GHS series of miniature, IC transducers has been announced by LEM. These components offer full isolation despite their small size, integrating the primary conductor for nominal current measurements of 10, 12, 16 or 20A with a measurement span of 2.5 times the nominal current, they are also able to support high overload currents up to 200A peak for short durations (1ms).

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