LV 100/SP58 Voltage Sensor – Precision Engineering, Delivering Superior Performance for High-Voltage Measurements

In the design and construction of automated and highprecision equipment, accurate voltage measurement is not only the foundation of data acquisition but also the cornerstone of safe and efficient system operation. The LV 100/SP58 Voltage Sensor, a proud achievement of LEM’s electrical measurement portfolio, leverages advanced closedloop Hall-effect technology, a wide measurement range, and military-grade robustness to provide an unparalleled solution for a variety of industrial highvoltage measurement needs. Whether in demanding HVDC transmission systems or complex variablefrequency drive applications, the LV 100/SP58 empowers your equipment with reliable, efficient, and precise voltage monitoring.

LV 100/SP58 Key Performance Features – Beyond Accuracy, Embracing Stability

Advanced Closed-Loop Hall-Effect Technology

The LV 100/SP58 employs state-of-the-art closed-loop Hall-effect technology, which not only ensures high galvanic isolation between primary and secondary circuits but also achieves a zero-flux operating state through magnetic compensation. This virtually eliminates measurement errors caused by hysteresis. Compared to conventional open-loop sensors, the closed-loop design delivers outstanding linearity and extremely low temperature drift, guaranteeing consistent measurement performance across all operating conditions.

Wide Dynamic Measurement Range

Using an external primary resistor (R1) selected by the user, the sensor can accurately measure high voltages from 100 V to 2500 V. With a primary input current of only 0.1 A (rms) , it achieves a precise measurement range of 0.2 A, significantly reducing power dissipation in the measurement loop.

Excellent Noise Immunity and Accuracy

In industrial environments flooded with electromagnetic interference, distortion and noise are major challenges for traditional measurement methods. Thanks to its fully shielded electromagnetic design and closed-loop principles, the LV 100/SP58 delivers an outstanding accuracy of 0.7% . It outputs an instantaneous 100 mA secondary current, faithfully representing high-order harmonics and fast transients – providing your control system with reliable, unaltered measurement data.

Military-Grade Industrial Standards & Wide Temperature Range

True ruggedness thrives in harsh environments. The LV 100/SP58 operates over a wide temperature range of 40℃ to +85℃, performing reliably whether in arctic cold or the hot, dusty conditions of a desert-region equipment room. Its broad supply voltage range of DC ±12 V to ±18 V ensures stable operation even under fluctuating power conditions.

LV 100/SP58 Applications – Solving High-Voltage Measurement Challenges

For applications demanding high-voltage measurement with robust isolation, the LV 100/SP58 is the smart choice:

Variable Frequency Drives (VFDs) – precise DC-bus voltage monitoring for optimised motor energy efficiency and dynamic response.

Railway Traction & Rolling Stock – reliable voltage feedback in auxiliary converters for high-speed trains and metros, supporting fault forecasting and realtime power quality analysis.

High-Voltage Power Supplies & UPS Systems – a critical protection link that prevents voltage fluctuations on the primary side from causing system-level failures.

Renewable Energy & Solar Inverters – accurate DC-link voltage measurement in PV combiner boxes and wind turbine converters to improve grid-connection quality.

Industrial Automation & Test Benches – perfect for high-voltage test platforms, welding equipment, and precision data acquisition systems.

Why Choose the LV 100/SP58?

Compared to conventional resistor dividers or linear optocouplers, the LV 100/SP58 offers not only a generational leap in accuracy and bandwidth but also a panel-mount form factor that makes installation intuitive and straightforward. Combined with LEM’s industry-proven long-term reliability, its service life significantly outperforms competing products, reducing your total cost of ownership (TCO). Its reliability has been proven in tens of thousands of industrial installations worldwide.