Shaanxi external sticker level gauge manual

1. Product Overview Ultrasonic externally attached liquid level gauge (hereinafter referred to as liquid level gauge) adopts advanced signal processing technology and high-speed signal processing chip, which breaks through the influence of the wall thickness of the container and realizes the true measurement of the liquid level in the closed container. Non-contact measurement. The ultrasonic sensor (probe) is installed just below the outer wall (bottom) of the container to be tested, and there is no need to open holes in the container to be tested. It is easy to install and does not affect production. It can accurately measure the liquid level of various toxic substances, strong acids, strong alkalis and various pure liquids in high temperature and high pressure airtight containers. The liquid level gauge has no special requirements for the material of the liquid medium and the container, and adopts the explosion-proof design to meet the explosion-proof requirements and can be widely used. The ultrasonic externally attached liquid level gauge is manufactured in accordance with the enterprise standard Q/SK 001-2013. 2. Working principle The liquid level gauge uses the special ultrasonic processing technology as the system core, which realizes the ultra-high-speed digital signal processing function. The value of the processed liquid level height is accurate, and there is no need for the CPU to analyze, compare and judge. After the CPU obtains the liquid level value, it can be sent to NVRAM for storage and digital display to display. In addition, the instrument can output (4 ~ 20) mA standard signal or output the measurement results to the computer (or secondary meter) through the RS-485 interface. As shown in Figure 1, when measuring the liquid level, the modulated acoustic wave signal is emitted from the probe, and the echo signal is detected by the probe after being reflected back by the liquid surface. After the echo signal is preprocessed, processed and post-processed, the time t is directly and accurately given, and the CPU calculates the liquid level height according to the relationship expressed by the digital model. h = act/2 h: liquid level height a: correction coefficient c: sound speed of ultrasonic wave in liquid t: time taken for sound wave from launch to return 50m. Display resolution: 1mm short-time repeatability: 1mm Measurement error: ±0.1%FS, ±0.2%FS (the tank wall is too thick, pressure and temperature instability may affect the accuracy). Migration amount: ±10 m Current output: 4～20mA, maximum load 750Ω ℃～+100℃, (wide temperature probe can be provided according to customer needs). Operating environment humidity: (15%～100%) RH explosion-proof mark: ExdⅡCT6 Shell protection: IP65 Liquid level display: 6-digit LCD display (unit: m) Blind zone: There is a measurement blind zone in the ultrasonic level gauge, when the liquid level is in the blind zone or the measurement When not displayed, the LCD screen will display 'LL.LLL'. 4. Application conditions 4.1 Purity of medium: no dense bubbles in the liquid; no large amount of suspended substances, such as crystals, etc. in the liquid; no large amount of sedimentary substances, such as sediment, etc. in the liquid. 4.2 Medium viscosity: dynamic viscosity<10mPa•S. 10mpaS<dynamic viscosity<30mPaS may reduce the range of the meter. dynamic viscosity>Cannot measure at 30mPaS. Note: As the temperature increases, the viscosity decreases, and most high-viscosity liquids are more affected by temperature, so pay attention to the effect of liquid temperature when measuring viscous liquids. 4.3 Measured container: Material: The container wall where the ultrasonic probe is installed is required to be made of hard materials that can transmit signals well.

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