HLSR 50-SM Sensors, Transducers

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Current Transducers

A current transducer is a device used to measure or sense the electric current of an electrical circuit. By converting a physical characteristic of the current, such as its voltage or its power to an electronic signal, signal processing can be employed to measure and monitor the current. The HLSR 50-SM is a device suitable for this purpose, due to its high precision and reliability as well as its robustness.

Application Fields

The HLSR 50-SM current transducer is most suitable for the measurement of low voltage DC (direct current) circuit elements. It is often found in use in battery and energy storage systems, as well as in applications such as electrical and mechanical diagnostics, power factor measurements, condition monitoring and protective relaying systems. The overall accuracy and stability makes the HLSR 50-SM the ideal device for high precision DC applications.

Working Principle

The HLSR 50-SM provides a high accuracy ratio transducer with a nominal output of 4 to 20 mA or 0 to 10 Vdc. Its operating principle is based on the conductance between two electrodes located on the secondary side of the transducer. A mV dc voltage is applied between the two electrodes which generates a current proportional to the magnitude of the applied voltage. This current is then converted to a user specified output signal by the internal circuitry.

The secondary side is designed with a differential amplifier to enhance the accuracy of the transducer. The gain of the amplifier is determined by the gain-setting resistor on the primary side of the transducer. The output current is proportional to the input current and the gain setting resistor determines the gain and linearity of the current transfer function.

The HLSR 50-SM is designed with a single PCB for the complete internal circuitry and is powered by a 24V dc source. The transducer features overload protection, over temperature protection and a built-in LED as indication of the operation status. It is equipped with two isolated channels that allow measurements of up to one hundred fifty amperes in both directions. The isolation of the two channels make it also suitable for two-wire systems.

Benefits

The HLSR 50-SM current transducer meets the requirements of high precision and good linearity with an accuracy of 0.2% of span. Due to its high accuracy and repeatability, the transducer can be used in many applications as a reference measuring device. The single PCB design ensures good shielding performance and electromagnetic compatibility (EMC). Additionally, the HLSR 50-SM is an enhanced version of the HLSR 50-S with improved reliability and temperature stability, making it suitable for extreme environment conditions.

In conclusion, the HLSR 50-SM current transducer is a reliable and accurate device for the measurement of low voltage DC circuits. Its single PCB design and strong EMC performance make it an ideal solution for industrial applications and long-term monitoring. With high accuracy, repeatability and overload protection, the HLSR 50-SM provides a cost-effective solution for precision DC current measurements.

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