Models, Structures and Installation Methods of Different Hall Current Sensors

Ⅰ. The product labels for Hall current sensors

Generally, it consists of two parts, sensor product model and "production date. The sensor product model is used to indicate the sensor's model, rated measurement value, working power supply and wiring instructions. The sensor production date is composed of 8 digits, indicating the production year, month and batch of the sensor (batches of products in months).

Ⅱ. The outline structure and installation wiring of Hall current sensors

There are many sensor products, and the shape and size of each Hall effect current transducer are different. The following describes several typical shape structures and installation and wiring methods.

1. The 25A current sensor

25A current sensor is a sensor with a very small range. The rated current that can be measured is 5, 6, 8, 12, and 25A. The different connection methods of the primary side pins can determine the rated measurement current.

2. The current sensor with wire

Like conventional current sensors, the general sensor has four pins: positive (+), negative (-), measuring terminal (M) and ground (0), but the current sensor with wire does not have these four pins, but there are three leads, red, black, yellow, and green, which correspond to the positive pole, the negative pole, the measurement terminal and the ground, respectively.

At the same time, there is an inner hole in most sensors, and the wire should be passed through the inner hole when measuring the primary current. The aperture size has a certain relationship with the product model and the measurement current.

No matter what type of Hall current sensor it is, the wiring of the pins during installation should be connected according to the conditions noted in the manual.

(1) When measuring AC power, a bipolar power supply must be enforced. That is, the positive electrode (+) of the sensor is connected to the "+VA" end of the power supply, and the negative electrode is connected to the "-VA" end of the power supply. This connection method is called a bipolar power supply. At the same time, the measurement terminal (M) is connected to the "0V" terminal of the power supply through a resistor (single-finger zero-flux type).

(2) When measuring DC current, a unipolar or single-phase power supply can be used, that is, the positive or negative electrode is short-circuited with the "0V" terminal, so as to form a situation where only one electrode is connected.

In addition, the use, model, measuring range, installation environment, etc. of the product must be fully considered during installation. For example, the Hall current sensor should be installed as far as possible in an occasion that is conducive to heat dissipation.

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