LEM LV100/SP72 High-Precision Closed-Loop Hall-Effect Voltage Transducer

LV100/SP72 Product Overview

The LV100/SP72 is a professional voltage transducer featuring high output current capability within the LV100 series, designed and manufactured by LEM, a global leader in sensor technology. The product uses closedloop Halleffect technology and provides galvanic isolation between the primary highvoltage circuit and the secondary electronic circuit, effectively ensuring the safety of downstream electronics and operators. It is suitable for a wide range of industrial applications with nominal voltages from 100V to 2500V.

As one of the highest output current models in the LV100 series, the SP72 version delivers an impressive instantaneous 100 mA secondary output signal and 0.7% high accuracy, offering unique advantages in industrial sites that require longdistance signal transmission.

LV100/SP72 Key Features & Benefits

Advanced Closed-Loop Hall-Effect Technology

The LV100/SP72 uses advanced closedloop Hall technology. Compared to conventional openloop sensors, it offers lower temperature drift, higher linearity, and stronger antiinterference capability, maintaining stable measurement performance even in complex electromagnetic environments.

Wide Voltage Measurement Range, Flexible Configuration

Through an external resistor R1, the device can be flexibly configured to cover a broad voltage range of 100V ~ 2500V, meeting diverse requirements from lowvoltage distribution to medium and highvoltage power systems. Users can select the appropriate external resistor according to the actual voltage to be measured, enabling flexible range combinations.

100 mA High Output Current Capability

A key differentiating advantage of the LV100/SP72 is its instantaneous 100 mA secondary output signal value. Compared to the common 50 mA output models (such as SP38, SP41, SP81) in the LV100 series, this model offers stronger driving capability, making it especially suitable for:

Longdistance signal transmission – The high output current effectively compensates for cable impedance losses, ensuring signal integrity over long distances.

Driving heavier loads – Easily drives multiple parallel receiving devices or lowimpedance input equipment.

Electromagnetic interference immunity – A stronger current signal provides a higher signaltonoise ratio, resulting in better transmission stability in complex industrial electromagnetic environments.

Wide Operating Temperature Range

The operating temperature covers -25°C ~ 70°C, sufficient for most industrial indoor environments and some outdoor applications.

Excellent Galvanic Isolation

The galvanic isolation between primary and secondary circuits not only ensures safety for downstream electronics but also significantly reduces commonmode interference and ground loops, providing a clean measurement signal for precision control systems.

Panel Mounting for Easy Integration

Standard panel mounting design facilitates easy integration into control cabinets, distribution panels, and professional test equipment, saving installation space and improving system integration efficiency.

LV100/SP72 Technical Specifications

LV100/SP72 Typical Applications

Thanks to its outstanding accuracy, high output current capability, and wide voltage measurement range, the LV100/SP72 is widely used in the following fields:

Longdistance voltage monitoring systems – In scenarios where the distance between the control room and field equipment is long, the 100 mA high output current ensures signal integrity without the need for additional signal amplification or conversion devices.

Parallel monitoring with multiple receiving devices – When a single sensor output needs to be fed into multiple devices such as a PLC, display meter, and data acquisition card, the powerful drive capability of this model avoids signal attenuation and distribution problems.

Industrial drives and servo control – Provides precise feedback for DCbus voltage monitoring in variable frequency drives, enabling accurate motor control.

Railway traction and rail transit – Used for voltage monitoring in train traction systems, meeting high reliability requirements.

Active power filters (APF) and power quality management – Responds quickly to voltage variations in harmonic mitigation equipment, ensuring a clean and stable power grid.

Specialty power supplies and welding equipment – Operates reliably under harsh conditions with high voltage and high current.

Why Choose the LEM LV100/SP72?

LEM brand reliability – As a global market leader in sensor technology, LEM’s core products are widely used in drives, welding, renewable energy, power supplies, and electric vehicles. Product reliability and technical excellence have been verified by users worldwide.

Higher strength – The SP72 boasts a 100 mA high output capability, making it one of the strongest driving models in the LV100 series, especially suitable for demanding applications requiring longdistance transmission and multiload driving.

Flexible adaptation – Users can select an external resistor R1 to easily adapt to different voltage levels from 100V to 2500V, enabling flexible range combinations.

Mature and reliable closedloop technology – Compared to openloop alternatives, it offers superior temperature stability, lower offset drift, and higher measurement bandwidth, handling challenging dynamic voltage variations.

Active and stable supply – The product status is Active, with a mature and stable supply chain. Its outstanding reliability has been proven in longterm industrial field applications.