Select AC current isolation transmitter should pay attention to a few problems: need to detect the AC current - such a transmitter is mainly based on the measurement size, wiring mode to determine the choice of transmitter: such as: Shenzhen Weihao MCE-IJ03 measuring AC current can be from 0.2mAac to 700Aac range, product design of different shapes; At 10Aac, the signal can choose the way of terminal connection and perforation connection, the aperture is 6.5mm and 20mm; More than 10Aac to 700Aac signals can be directly on the integrated perforated transmitter, aperture 20mm,63mm, etc.
The precision, isolation and pressure resistance of this kind of western products are very high; Another conversion of the input current of the transmitter is through the transformer, for example, the AC current of 3000Aac or 400Aac can be converted into 0-5Aac signal through the mutual inductor, so as to measure the 5A AC signal on the secondary side. At this time, the transmitter with the terminal connection can be selected. Thus output the corresponding linear signal - the international standard for output signals usually uses DC 4-20mA. Of course, the output DC signal can also use a direct current voltage (such as: DC 0-10V, etc.), which should be matched with the input of the instrument or automatic control device behind the current transmitter. Specifications of auxiliary power Supply - DC current transmitters usually require an auxiliary power supply as the working power supply of the current transmitter. Generally, the most commonly used is the easily available AC 220V. You can also choose DC power supply, such as: DC 24V and so on. It should be noted that there are some current transmitters, claiming that no auxiliary power is required, that is, the so-called \"passive\" current transmitter chooses different products according to different circumstances! Whether the work and appearance of the AC current transmitter give a kind of precision and harmonious feeling and whether the size of the terminal is convenient for all aspects of the characteristics of the AC current transmitter nominal by the field wiring manufacturer: such as product accuracy, product linear relationship, product isolation and voltage resistance; When there are special requirements, the product needs to be tested!