Analysis of the power supply mode of the liquid level transmitter

What is the power supply mode of the level transmitter/level gauge? The meter needs electrical energy to provide energy, and the power supply is also an important part of the meter. There are basically two power supply methods for meters on the market: alternating current and direct current. 1. AC power supply. In each instrument panel, the 220V AC power frequency power supply is respectively output, which is first stepped down by the liquid level transmitter; then rectified, filtered, regulated and regulated as its own power supply for early electrical instrumentation systems. The downside is that this power mode requires additional level transmitter, rectifier, and voltage regulator circuits in each meter, increasing the size and weight of the meter. The heat of the liquid level transmitter increases the temperature rise of the meter; 220V AC is directly connected to the meter, which will reduce the safety of the meter. Two DC power supply. DC centralized power supply means that each instrument panel is uniformly powered by a DC low-voltage power supply box. The power frequency 220V AC voltage is converted, rectified, filtered and stabilized in the power box to power each meter. The advantages of centralized power supply are many: ① It saves the built-in rectifier and voltage regulator of the liquid level transmitter, thereby reducing the volume of the instrument, reducing the weight of the instrument, and reducing the heating components, thereby reducing the temperature rise of the instrument; ② By using a DC low-voltage centralized power supply, measures to prevent power failure can be taken; when the 220V AC power supply is cut off, it can be directly connected to a DC low-voltage (such as 24V) backup power supply to form a power-free equipment; ③ The instrument has no industrial 220V AC input, which is a The explosion-proof of the instrument provides favorable conditions.

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