FL Series – Open Loop Coreless Integral Sensors
The FL Series is a high‑capacity family of open‑loop, coreless current sensors engineered for the precise electronic measurement of DC, AC, and pulsed currents with reinforced galvanic isolation. Leveraging OLCI (Open Loop Coreless Integral) technology, FL sensors are built to deliver robust performance across industrial, traction, and trackside applications requiring very high primary current handling.
Designed for extreme current levels up to 42 kA, the FL Series addresses applications with large conductors thanks to its 200 mm or 300 mm aperture options. FL sensors are available with both 4–20 mA and 0–5 V output versions, supporting straightforward integration into advanced measurement and monitoring architectures.
FL – Features and benefits
Main characteristics
- Hall effect Open Loop Coreless Integral (OLCI) current sensor
- Unipolar or bipolar measurement up to 42 kA
- Instantaneous outputs: 4–20 mA current output or 0–5 V voltage output
- +12 V or +24 V DC power supply
- Galvanic isolation between primary and secondary circuits
- Factory calibrated
- High bandwidth > 1 MHz
- Very low delay time (< 400 ns)
Benefits
- Wide measurement range
- No magnetic offset, thanks to coreless structure
- Low losses and stable behavior over large conductor geometries
- Wide range of rectangular busbar dimensions
- Light weight design
- M12 field connector for reliable industrial integration
- Available with two large aperture sizes: 200 mm and 300 mm
Typical applications
The FL Series is designed for ultra‑high‑current applications in industrial, renewable, and traction environments, including:
- Wind turbine power converter
- Electrolyser
- High power drives
FL - Open Loop Coreless Integral (OLCI) current sensors
FL transducers - Standards compliance
| FL Series |
|---|
| IEC 62477-1: 2022 |
| IEC 61800-5-1: 2022 |
| IEC 62109-1: 2010 |
| IEC 61010-1: 2010 |
| EN 50155: 2021 |
| IEC 61992-7-2: 2006 |
| IEC 61010-2-030: 2017 |
| UL 61010-1: 3ED 2022 |
LEM FL – Download & Technical Characteristic
FL Sensors – ASK FOR SAMPLES / QUOTATIONS
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