Hall current sensors and voltage sensors only require external positive and negative DC power supplies. The measured current bus generally passes through the sensor or is connected to the primary terminal, and then some simple connections are made at the secondary terminal to complete the isolation detection of the main control circuit. The circuit design is very simple.

If used in conjunction with a transmitter, after A/D conversion, it can be easily interfaced with a computer or various instruments, and can be transmitted over long distances.

1. Direct wiring method

Direct current sensors are available in the HDC series. Its output signal is voltage mode, and under rated working conditions, its standard output signal is ± 4V, which users can choose according to their needs. There are zero point and gain potentiometer on the sensor, and users generally do not need to make adjustments. If the user has special requirements, they can order from the factory. The wiring method of direct current sensors may vary depending on the specific product, but there are usually four wiring terminals: positive power input connected to the "+" terminal, negative power input connected to the "-" terminal, "M" terminal for signal output, and "0" terminal for power ground.

2. Magnetic balance (compensation) type wiring method

There are two series of magnetic balance (compensation) current and voltage sensors/converters: HNC and HNV: their output signals are mostly current. If a voltage output method is required, a sampling resistor can be connected externally between the M terminal and the current ground according to the required voltage size or the sampling voltage can be amplified as necessary

The three wiring terminals of this type of conventional sensor are: positive power input connected to the "+" terminal, negative power input connected to the "-" terminal, and the "M" terminal is the signal output terminal.

3. Wiring method for voltage sensors

Voltage sensors generally have 5 wiring terminals, with "V+" and "V -" as the primary terminals, respectively connected to the positive and negative terminals of the measured voltage input terminal. The other three terminals are secondary terminals, with the "+" terminal connected to a+15V power supply, the "-" terminal connected to a -15V power supply, and the "M" terminal serving as the signal output terminal.

According to the different sizes of the measured voltage, users can connect a current limiting resistor R in series at one end of the measured voltage as needed, and then connect it to the original side of the sensor. The size of the series resistor R is determined by the following equation:

R=Vp/Iin-Rin

In the formula, R is the series resistance, Vp is the measured voltage, Iin is the rated input current, and Rin is the primary internal resistance of the sensor.

The power of the series resistor is determined by W=Vp? Iin confirmed.

4. Transformer (transmitter) wiring method

There are six series of converters, including HY1~HY6, which can be used in conjunction with sensors to form different transmission forms.

The current sensor can be connected to the transformer to form a current transformer; The voltage sensor can be connected to the converter to form a voltage converter. The converter can also be used separately. If the output signals of other sensors (such as pressure, temperature, etc.) are connected to the converter, the output signals of ordinary sensors can be transformed and amplified into standard signals of 0-20mA or 4-20mA for long-distance transmission or computer interface. (According to user needs, it can be divided into two types: isolated and non isolated)