What is the Hall Liner Sensor

The Hall Liner Sensor is a small, lightweight sensor that is mounted on the outside of the door frame. It uses an infrared beam to detect when someone enters the room, and sends a signal to the control panel. The Hall Liner Sensor is battery operated, and has a low-battery indicator light.

• What are the advantages of Hall Liner Sensor?

• How does the Hall Liner Sensor work?

• What is the development history of Hall Liner Sensor?

What are the advantages of Hall Liner Sensor?

1. Hall Liner Sensor can measure the current and voltage of any waveform, such as: DC, AC, pulse waveform, etc., even the measurement of transient peak. The secondary current faithfully reflects the waveform of the primary current. Ordinary transformers are incomparable, and Hall Liner Sensor is generally only suitable for measuring 50Hz sine waves;

2. There is good electrical isolation between the primary circuit and the secondary circuit, and the isolation voltage can reach 9600Vrms;

3. High precision: the precision in the working temperature range is better than 1%, which is suitable for the measurement of any waveform;

4. Good linearity: better than 0.1%;

5. Wide bandwidth: The rise time of high-bandwidth current sensors can be less than 1μs; however, the bandwidth of voltage sensors is narrow, generally within 15kHz, and the rise time of 6400Vrms high-voltage voltage sensors is about 500uS, and the bandwidth is about 700Hz.

How does the Hall Liner Sensor work?

If the Hall integrated circuit is used as a sensor, it is necessary to use a mechanical method to change the magnetic induction intensity. For example, a rotating impeller is used as a switch to control the magnetic flux. When the impeller blade is in the air gap between the magnet and the Hall integrated circuit, the magnetic field deviates from the integrated chip, and the Hall voltage disappears.

In this way, the change of the output voltage of the Hall integrated circuit can indicate a certain position of the impeller drive shaft. Using this working principle, the Hall integrated circuit chip can be used as an ignition timing sensor. Hall Liner Sensor is a passive sensor, it needs an external power supply to work, this feature enables it to detect low speed operation.

What is the development history of Hall Liner Sensor?

Hall current sensor is a sensor that uses the Hall effect to convert a large current into a secondary small voltage signal. The actual design of the Hall sensor often amplifies the weak voltage signal into a standard voltage or current signal through circuits such as operational amplifiers.

The Hall current sensor made of the above principle is called [open-loop Hall current sensor].

In order to improve the performance of the sensor, later generations made a slight modification, which is to use a compensation winding to generate a magnetic field. Through closed-loop control, it is equal to the magnetic field generated by the measured current and opposite in direction to achieve the effect of mutual cancellation. At this time, the compensation The current in the winding is proportional to the magnitude of the measured current. This kind of sensor is called [closed-loop or magnetic balance Hall current sensor].

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