A u-tube mercury manometer is often used in the laboratory to measure the pressure from vacuum to atmospheric pressure. Although this method is simple in principle and vivid in light, it is gradually replaced by digital electronic pressure gauges due to the toxicity of mercury and the difficulty in remote observation and automatic recording. Digital electronic manometer has been widely used because of its advantages such as small size, high precision, simple operation, convenient remote observation and automatic recording. The main pressure sensor, measuring circuit and electrical indicator are composed of three parts. The pressure sensor is mainly composed of bellows, strain beams and semiconductor strain gauges.
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