LV25-P Closed-Loop Hall Effect Voltage Sensor – The Ideal Choice for High-Precision Voltage Measurement

LV25-P Product Overview

The LV25-P is a closed-loop Hall-effect voltage sensor from LEM, a globally recognized leader in electrical measurement. Designed for the electronic measurement of DC, AC, and pulsed voltages, it provides complete electrical isolation between the primary (high voltage) and secondary (electronic) circuits, ensuring system safety. With a compact PCB-mount design, it is easy to integrate into a wide range of power control and industrial automation equipment.

As a core model of the LV25 series, the LV25-P features a rated primary current of 10mA and a rated RMS primary voltage range of 10V to 500V. Users can select an appropriate external series resistor based on the voltage to be measured, making it flexible for different voltage measurement requirements.

LV25-P Key Technical Advantages

1. Closed-Loop Hall Effect Technology – Accurate and Reliable

The LV25-P uses advanced closed-loop (magnetic compensation) Hall effect technology, which dynamically compensates for the magnetic field generated by the measured current, eliminating the non-linearity and temperature drift found in open-loop sensors. This design provides excellent linearity and accuracy over a wide temperature range, delivering "laboratory-grade" measurement performance in industrial environments.

2. 0.9% Class Accuracy – Reliable in Demanding Conditions

At 25°C, the LV25-P offers a total measurement error of ±0.8% to ±0.9% F.S., with linearity better than 0.8%. It maintains stable measurement performance across its operating temperature range of 0°C to +70°C. The zero offset current is only ±0.15mA, with temperature drift of less than ±0.35mA, providing a reliable data foundation for high-precision power monitoring.

3. Microsecond Response – Capture Dynamic Changes

With a response time of less than 40µs and di/dt tracking accuracy exceeding 50A/µs, the LV25-P can quickly track instantaneous voltage fluctuations, meeting the demanding dynamic response requirements of modern applications. Its bandwidth covers DC to 10kHz, making it suitable for high-frequency environments such as inverters and servo drives.

4. Robust Galvanic Isolation

The sensor provides a 2.5kV dielectric withstand voltage (50Hz, 1 minute) between the primary and secondary circuits, establishing a reliable isolation barrier between high-voltage and low-voltage sides. The housing is made of UL94-V0 flame-retardant insulating plastic, further enhancing safety.

LV25-P Technical Specifications

LV25-P Typical Applications

Thanks to its high accuracy, wide bandwidth, and strong isolation, the LV25-P is widely used in industrial and energy applications:

AC variable speed drives – Real-time output voltage monitoring for closed-loop control

Servo motor drives – Wide bandwidth supports high-frequency current detection

Static converters for DC motor drives

Uninterruptible power supplies (UPS) – Ensures critical load power quality and reliability

Switching power supplies – Monitors output voltage stability

Welding power supplies – Maintains stable measurement in harsh electrical environments

Wind power systems – Helps synchronize inverter output voltage with grid voltage in direct-drive wind turbines

Photovoltaic systems – High-precision monitoring under extreme temperatures improves system efficiency

Why Choose the LV25-P?

Balanced performance – High accuracy, wide bandwidth, fast response, and strong isolation all in one device

Versatile applications – Suitable for variable frequency drives, servo drives, UPS, renewable energy, and more

Original quality – LEM brand backed by a global supply chain

Fast delivery – Readily available from major electronic component distributors