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Technical Description — LT 1005‑S/SP28 Current Transducer

The LT 1005‑S/SP28 is a closed‑loop Hall‑effect current transducer designed for accurate measurement of AC, DC, and pulsed currents with excellent linearity and dynamic performance. It offers galvanic isolation between the high-current primary circuit and the low-power secondary output, making it suitable for demanding industrial environments such as traction systems, motor drives, power inverters, and UPS systems.

 

Electrical Specifications: Primary Current & Sensing

• Primary nominal RMS current (Ipn): 1000 A — rated continuous current.

• Primary measuring range (IP): 0 … ±2400 A — extended bidirectional current measurement capability.

• Sensing Technology: Closed‑loop compensated Hall‑effect—for high accuracy and linear response across the measurement range.

• Conversion ratio (Kn): ~1:5000 secondary to primary (output proportionality).

 

Secondary Output

• Secondary nominal RMS current (Isn): 200 mA — proportional output current that can be converted to voltage via an external burden resistor.

• Output Type: Current output — active current proportional to measured primary current.

 

Supply & Performance

• Supply Voltage: ±15 V … ±24 V DC (bipolar supply) required for operation.

• Overall Accuracy: ±0.5% at nominal current.

• Linearity Error: < 0.1 %.

• Response Time: Less than 1 µs to 90% of final value.

• Frequency Bandwidth: DC … ~150 kHz.

• di/dt Capability: > 50 A/µs.

 

Environmental & Safety Ratings

• Operating Ambient Temperature: –40 °C to +85 °C.

• Storage Temperature: –50 °C to +85 °C.

• Isolation Voltage (Vd): ~12 kV RMS (primary‑secondary).

• Shielding: Screened cable with shield between primary and secondary for noise immunity.

 

Mechanical & Mounting

• Mounting Type: Panel mount with reinforced mounting feet.

• Housing: Insulated plastic case recognized as UL94‑V0.

• Mass: Approx. 700 g.

• Secondary Connection: Screened cable (typically 3 × 0.5 mm²).

Functional Highlights

• Galvanic isolation ensures safety when monitoring high currents.

• High linearity and accuracy over wide current ranges.

• Fast response and wide bandwidth suitable for dynamic current control.

• Robust performance in industrial and traction environments.

 

Typical Applications

• Traction and railway systems

• Motor drives and power converters

• UPS and energy storage systems

• Industrial current monitoring and control

• Power electronics test systems

Overview

The HAX 2000‑S is a compact open‑loop Hall effect current transducer designed to measure AC, DC, and pulsed currents up to 2000 A RMS nominal while providing electrical isolation between the high‑current primary path and the secondary measurement circuitry. It produces a proportional analog voltage output suitable for industrial controllers, data‑acquisition systems, and power monitoring equipment.

 

Electrical Specifications

Parameter Specification Primary Nominal RMS Current (IPN) ~2000 A Measuring Range (±IPM) ±5500 A Supply Voltage (UC) ±15 V DC bipolar (±5 %) Output Voltage (Uout) ±4 V analogue (ratiometric) Current Consumption (IC) < +20 mA / –15 mA Internal Output Resistance (Rout) ~100 Recommended Load Resistance (RL) > 1 kΩ Frequency Bandwidth DC … 25 kHz (–3 dB) Response Time < 5 µs to 90 % of final value Isolation Resistance> 1000 MΩ @ 500 V DC Overload Capability (Peak) ~30 000 A peak

 

Performance & Accuracy

• Accuracy: ±1 % of rated current at 25 °C (excluding offset drift)

• Linearity Error: < ±1 % over ±IPN

• Offset Voltages:

  • Electrical offset < ±20 mV

  • Hysteresis offset < ±30 mV after a 1× IPN excursion

• Temperature Coefficients:

  • Offset coefficient < ±1 mV/K

  • Output gain drift < ±0.1 %/K

 

Mechanical & Environmental

• Operating Ambient Temperature: –40 °C to +85 °C (some variants up to +105 °C with SP19 suffix)

• Mounting: Panel / chassis mount design

• Case: Insulating plastic housing compliant with UL 94‑V0 for industrial safety

• Mass: Approx. ~450 g (typical)

 

Principle of Operation

The HAX 2000‑S uses open‑loop Hall effect technology, where a Hall sensor detects the magnetic field produced by the current flowing through a large-aperture conductor. The detected field is converted into an analog voltage output proportional to the measured current. This allows non‑intrusive, isolated measurement of both DC and AC currents without direct electrical connection to the power path.

 

Typical Applications

The HAX 2000‑S is ideal for high‑current industrial and power electronics systems, including:

• AC variable speed drives and servo motor drives
• Static converters for DC motor control
• Battery‑fed systems and renewable energy inverters
• Uninterruptible Power Supplies (UPS)
• Power supplies for welding and SMPS applications

Environmental & Mechanical

• Operating Temperature: Typically –40 °C to +85 °C (industrial range).
• Mounting Style: Panel mount or PCB mount depending on subvariant (SP11 typically denotes a mount/connector style).
• Aperture Size: ~20 mm through‑hole for the primary conductor.
• Housing: UL94‑V0 certified insulating plastic case.

 

Key Features 

• Closed‑loop Hall‑effect measurement with excellent linearity and low temperature drift.
• Galvanic isolation improves safety in high‑current systems.
• Good overload capability and noise immunity.
• Fast response and wide bandwidth suitable for PWM inverter currents and dynamic loads.

 

Typical Applications

• Industrial motor drives and inverters
• Uninterruptible Power Supplies (UPS)
• Battery management and power monitoring
• Renewable energy converters (solar, wind)
• Switch‑mode power supplies (SMPS)
• Overcurrent detection and protection systems

Product Overview

The LF 505‑S/SP27 is a closed‑loop Hall‑effect current transducer designed for accurate electronic measurement of AC, DC, and pulsed currents with galvanic isolation between the primary high‑power circuit and the low‑power secondary output. It is suitable for industrial applications such as motor drives, power converters, UPS systems, and battery‑supplied equipment.

 

Key Electrical Specifications Primary and Sensing

• Primary nominal RMS current (Ipn): 500 A — rated continuous current capability of the sensor.
• Primary measuring range (Ip): 0 … ±1480 A — bidirectional measurement range when supplied at ±24 V.
• Sensing technology: Closed‑loop compensated Hall‑effect — active flux compensation provides high accuracy and linearity.
• Turns ratio (Kn): 1 : 5000 — relates primary current to secondary output current.

 

Secondary and Output

• Output type: Proportional current output — the transducer provides a current on the secondary proportional to the measured primary current.
• Secondary nominal RMS current (Isn): 100 mA at rated primary current.
• Secondary measuring/burden: The secondary current is typically converted to a voltage signal using an external burden resistor sized per application needs.

 

Supply & Performance

• Supply voltage: ±24 V DC (±5 %) — bipolar DC supply powers the internal electronics.
• Current consumption: ~33 mA + Isn typical.
• Accuracy: ~±0.6 % at nominal current at 25 °C.
• Linearity error: < 0.1 % typical.
• Response time: < 1 µs (to 90 % of final value).
• Frequency bandwidth: DC to ~100 kHz (–1 dB).
• di/dt capability: > 200 A/µs — can follow fast current changes.

 

Environmental & Safety Ratings

• Ambient operating temperature: –40 °C … +70 °C.
• Ambient storage temperature: –40 °C … +85 °C.
• Isolation: Galvanic between primary and secondary with a plastic case recognized to UL 94‑V0 for safety.

 

Mechanical & Mounting

• Mounting type: Panel / chassis mount with a single pass‑through aperture for the primary conductor.
• Mass: Approx. 230 g — compact and rugged for industrial use.
• Secondary connection: Typically via a small connector (e.g., JST) for easy wiring.

 

Functional Highlights

• Galvanic isolation ensures safe sensing in high‑power environments.
• Closed‑loop Hall‑effect sensing gives low offset, good linearity, and stable performance over temperature.
• Fast dynamic response handles pulsed and rapidly changing currents.
• Wide bandwidth makes it suitable for both steady and high‑frequency current components.

 

Typical Applications

• Variable‑speed motor drives and servo systems
• Power inverters and converters
• Battery‑based power systems and UPS
• Welding power supplies and heavy industrial loads
• Current protection and control electronics

The HAT 1200‑S is an open‑loop Hall‑effect current transducer designed for accurate measurement of AC, DC, and pulsed currents with galvanic isolation between the monitored conductor (primary) and the electronics (secondary). It provides a proportional analogue voltage output and is widely used in industrial applications such as motor drives, power supplies, UPS systems, renewable energy inverters and welding power units.

 

Operating Principle

• Open‑Loop Hall Effect: Senses the magnetic field created by the primary current using a Hall sensor.
• Galvanic Isolation: Primary current path is electrically isolated from the output circuitry, improving safety and noise immunity.
• Analogue Output: Produces a voltage proportional to the sensed current.
• Bidirectional Measurement: Detects both positive and negative current direction with equal sensitivity.

 

Performance & Accuracy

• Accuracy: ±1 % of nominal current at 25 °C (excluding offset)
• Linearity Error: ≤ ±1 % over ±IPN
• Offset Voltages:
• Electrical offset: < ±20 mV
• Hysteresis offset (after excursion): < ±10 mV

 

Temperature Coefficients:

• Output drift < ±0.05 %/K
• Offset drift < ±1 mV/K (–40 to +80 °C)
• Response Time: < 5 µs to reach 90 % of final value

 

Mechanical & Environmental

• Operating Temperature Range: –40 °C to +105 °C
• Mounting Type: Panel / chassis mount
• Case Material: Insulating plastic casing compliant with UL 94‑V0 flammability rating
• Weight: Approx. 245 g (varies by variant)

 

Typical Applications

Ideal for high‑current measurement and monitoring in:

• Motor drives and control systems
• Switched‑mode power supplies (SMPS)
• Variable speed AC drives
• Uninterruptible Power Supplies (UPS)
• Battery energy systems and renewable inverters
• Welding power supply monitoring 

Overview

The HAT 800‑S is part of LEM’s HAT Series of open‑loop Hall effect current transducers that measure electrical currents (AC, DC, or pulsed) while providing galvanic isolation between the primary high‑current path and the secondary measurement electronics.

 

Operating Principle

• Open‑loop Hall Effect Technology: The sensor uses a Hall effect element to detect the magnetic field generated by current flowing through the primary conductor and outputs a proportional analog voltage signal.

• Galvanic Isolation: The design inherently isolates the primary high‑power side from the secondary electronics, improving safety in measurement systems.

• Voltage Output: The analog output signal represents the instantaneous current proportional to the primary current flow.

 

Key Technical Specifications

Specification Details Nominal Primary Current (I<sub>PN) 800 A RMS Measuring Range ±2400 A (approx. 3× rated nominal) Output Signal Analog voltage output ±4 V at rated current Supply Voltage Bipolar DC supply, typically ±15 V Accuracy ±1 % (typical) Bandwidth DC up to ~25 kHz Operating Temperature Range—–40 °C to +105 °CMounting StylePanel mount (through‑hole) Output Type: ±4 V instantaneous analog output

 

Functional Characteristics Open‑Loop Hall Effect

• Offers a good balance between performance and cost for general industrial current sensing.

• Fast response and wide bandwidth allow tracking dynamic current changes in PWM and drive systems.

 

Analog Output

• The output spans approximately –4 V to +4 V at ±800 A primary current, proportional to the instantaneous measured current.

• The analog nature makes it compatible with ADCs or measurement systems capable of handling bipolar voltage inputs.

 

Electrical & Safety Considerations

• Galvanic Isolation: Primary circuit is isolated from measurement electronics, enhancing safety in high‑power systems.

• Insulation Resistance: Typically >1000 MΩ @ 500 V DC (based on series datasheet figures).

• UL 94‑V0 Plastic Housing: Insulating case meets industrial flammability ratings.

• Compliance: Designed to meet safety and industrial standard norms (e.g., EN 50178 and UL 508, depending on region/version).

 

Typical Applications

Ideal in systems requiring isolated current sensing in medium‑power environments:

• AC/DC/servo drives and motor controls

• Switch‑mode power supplies (SMPS) and UPS systems

• Battery and inverter systems

• Welding power sources

• Renewable energy converters (solar/wind)

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General Description

The LF1005‑S/SP16 is a closed‑loop Hall‑effect current transducer designed for electronic measurement of AC, DC, and pulsed currents with high accuracy and fast response. It provides galvanic isolation between the high‑power primary circuit and the secondary measurement/output circuit, which enhances safety and protects connected electronics.

Closed‑loop Hall transducers like this one maintain precise measurement across wide current ranges thanks to active compensation of magnetic flux, yielding better linearity and dynamic performance than basic open‑loop designs.

 

Key Technical Specifications Electrical Characteristics

• Measurement Principle: Closed‑loop compensated Hall effect transducer

• Primary Nominal RMS Current (Ipn): 1000 A

• Measuring Range: 0 … ±2100 A (depending on supply voltage)

• Turns / Ratio: 1 : 5000

• Supply Voltage (Vcc): ±15 V … ±24 V (±5 %)

• Secondary Nominal RMS Current (Isn): 200 mA

• Measuring Resistance (Rm): Varies with current & supply; typical ranges from ~0 to ~60 Ω depending on conditions.

 

Performance

• Overall Accuracy (at Ipn, 25 °C): approx. ±0.4 %

• Linearity Error: < 0.1 %

• Response Time (to 90% of final output): < 1 µs

• Frequency Bandwidth: DC … 150 kHz

• di/dt Capability: Can accurately follow more than 100 A/µs changes

 

Environmental & Physical

• Operating Ambient Temperature: –40 °C … +85 °C

• Storage Temperature: –50 °C … +90 °C

• Insulation Test Voltage: 3 kV RMS @ 50 Hz, 1 min

• Creepage / Clearance & Tracking: Designed to meet safety standards (e.g., EN 50178/IEC 61010‑1) for reinforced/basic insulation, with adequate distances between primary and secondary circuits

• Mass: ~500 g (varies by packaging)

• Case Material: Insulated plastic (UL 94‑V0)

 

Functional Highlights

Galvanic Isolation
Provides safe separation of the high current path from the electronic circuits, suitable for industrial power control and monitoring systems.

 

High Linearity & Accuracy
Excellent precision across broad current ranges minimizes measurement errors, enabling reliable control feedback.

 

Fast Response & Wide Bandwidth
Can track rapid current changes, making it suited for servo drives, power converters, UPS systems, and other fast‑acting control applications.

 

Robust Thermal Performance
Operates reliably over a wide temperature range and has low thermal drift.

 

Typical Applications

• Variable frequency drives and servo motor systems

• Static DC motor converters

• Battery‑based systems and UPS

• Power supplies and welding equipment

• Renewable energy inverters and traction systems

General Overview

• LA205-S is a closed-loop Hall-effect current transducer manufactured by LEM.
• It is designed for precise measurement of AC, DC, and pulsed currents.
• Provides galvanic isolation between:
• High-power primary circuit
• Low-power measurement/control circuit

 

Operating Principle

• Uses closed-loop (compensated) Hall Effect technology:
• Primary current creates a magnetic field
• Hall sensor detects flux
• Compensation current is generated in secondary winding

 

Output current is proportional to input current → high accuracy and fast response.

 

Key Features

• Nominal primary current (IPN): 200 A
• Measurement range: ±300 A
• Closed-loop Hall effect sensor
• Galvanic isolation
• High accuracy (~±0.8%)
• Wide bandwidth (DC to ~100 kHz)
• Fast response time (~1 µs)
• Excellent linearity and low temperature drift
• High immunity to electromagnetic interference

 

Electrical Characteristics Primary Side

• Nominal current (IPN): 200 A
• Measuring range (IP): 0 to ±300 A
• Overload capability: up to ~600 A (short duration)
• Secondary Side
• Output type: Current output
• Nominal secondary current (ISN): 100 mA
• Conversion ratio: 1 : 2000

 

Suitable for fast-switching power electronics (IGBT, PWM systems)

 

Isolation & Safety

• Isolation voltage: up to ~3.25 kV (basic insulation)
• Safe separation voltage: ~1625 V RMS
• Insulated plastic case (UL94-V0)

 

Thermal & Environmental Data

• Operating temperature: −10°C to +85°C
• Storage temperature: −40°C to +90°C
• Low thermal drift → stable measurements

 

Mechanical Characteristics

• Mounting: Panel mount
• Primary conductor: passes through aperture
• Aperture size: approx. 22.7 × 17.4 mm
• Weight: ~110 g

 

Applications

• Widely used in:
• AC variable speed drives / servo drives
• Static converters for DC drives
• UPS systems
• SMPS (Switched Mode Power Supplies)
• Battery-powered systems
• Welding equipment

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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