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    超声波清洗机生产厂家教你选择实用的压力传感器
    2019-8-29 15:10:41
    1. 什么压力值适合传感器测量?
    1. What pressure value is suitable for sensor measurement?
    答:首先需要知道的是对应系统所需的最大压力。那么所需要的压力传感器的最大压力范围应该是系统所需要的最大压力值的1.5倍。这些额外的压力范围是由于压力峰值或连续脉冲在许多系统,特别是液压和过程控制。这些尖峰可以达到“最大”压力的5到10倍,可能会损坏传感器。连续的高压脉冲,接近或超过传感器的最大额定压力,也会缩短传感器的寿命。因此,仅仅增加传感器的额定压力并不是一个万无一失的解决方案,因为这会牺牲传感器的分辨率。缓冲器也可以用来减少峰值,但这只是一个折衷方案,因为它减少了传感器的响应时间。
    Answer: The first thing you need to know is the maximum pressure required to respond to the system. Then the maximum pressure range of the pressure sensor needed should be 1.5 times of the maximum pressure required by the system. These additional pressure ranges are due to peak pressure or continuous pulses in many systems, especially hydraulic and process control. These peaks can reach 5 to 10 times the "maximum" pressure and may damage the sensor. Continuous high-voltage pulses, approaching or exceeding the maximum rated pressure of the sensor, will also shorten the life of the sensor. Therefore, simply increasing the rated pressure of the sensor is not a foolproof solution, because it will sacrifice the resolution of the sensor. Buffers can also be used to reduce peak values, but this is only a compromise because it reduces sensor response time.
    2. 传感器需要达到什么精度?

    2。 What precision does the sensor need to achieve?

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    答:精度是一个行业中常用的术语,用来描述传感器的输出误差。它来自于非线性、滞后、不可重复性、温度、零点平衡、校正和湿度效应。一般来说,我们指定了非线性、滞后和不可重复性的综合效应来保证精度。对于许多传感器,由于温度、零点平衡等因素,“精度”可能低于标称值。精度更高的传感器成本更高,那么系统真的需要这样的精度吗?使用高精度传感器和低分辨率仪器的系统是一个低效的解决方案。
    Answer: Accuracy is a term commonly used in the industry to describe the output error of sensors. It comes from non-linearity, hysteresis, non-repeatability, temperature, zero balance, correction and humidity effect. Generally speaking, we specify the combined effects of nonlinearity, hysteresis and non-repeatability to ensure accuracy. For many sensors, due to temperature, zero balance and other factors, "accuracy" may be lower than the nominal value. High precision sensors cost more, so does the system really need such accuracy? A system using high precision sensors and low resolution instruments is an inefficient solution.
    3.传感器的电阻是多少?
    3. What is the resistance of the sensor?
    答:与所有物理设备系统一样,压力传感器也会产生误差,甚至在极端温度下无法使用。一般每个传感器有两个温度范围,即工作范围和补偿范围。补偿范围包含在工作范围内。
    Answer: Like all physical equipment systems, pressure sensors can cause errors, and even can not be used at extreme temperatures. Generally, each sensor has two temperature ranges, i. e. working range and compensation range. The compensation range is included in the scope of work.
    工作范围是指传感器通电后暴露在介质中而不损坏的范围。然而,这并不意味着它的性能可以满足标称规格(温度系数),当它在补偿范围之外。
    The working range refers to the range in which the sensor is exposed to the medium without damage after electrification. However, this does not mean that its performance can meet the nominal specification (temperature coefficient), when it is outside the compensation range.
    补偿范围一般在工作范围内较窄。在此范围内,传感器保证满足公称规格。温度变化对传感器的影响有两个方面,一是引起零点漂移,二是影响整个范围的输出。传感器规格书应列出以下误差:±x%全量程/℃、±x%读数/℃、±x%全量程温度补偿或±x%全温度补偿。缺少这些参数会导致您的使用不确定。那么传感器输出的变化是由于压力变化还是温度变化?温度效应将是理解如何使用传感器中最复杂的部分。
    The compensation range is generally narrow within the working range. Within this range, sensors are guaranteed to meet nominal specifications. The influence of temperature change on the sensor has two aspects: one is to cause zero drift, the other is to affect the output of the whole range. The sensor specifications should list the following errors: +x% full range/ C, +x% reading/ C, +x% full range temperature compensation or +x% full range temperature compensation. Lack of these parameters can lead to uncertainty in your use. So is the change in sensor output due to pressure or temperature? Temperature effects will be the most complex part of understanding how to use sensors.
    4. 什么样的输出?
    4. What kind of output?
    答:传感器的平均输出电压为毫伏,可以是电压放大、毫安,也可以是频率输出。所选择的输出类型取决于所选传感器与系统控制或显示部件之间的距离、噪声和其他电气干扰,以及放大的需要和放大器的最佳位置。对于许多原始设备制造商来说,他们的控制元件和传感器非常接近,所以毫伏的输出通常是足够的和经济有效的。
    Answer: The average output voltage of the sensor is millivolt. It can be voltage amplification, milliampere or frequency output. The output type selected depends on the distance between the selected sensor and the system control or display components, noise and other electrical interference, as well as the need for amplification and the optimal position of the amplifier. For many original equipment manufacturers, their control components and sensors are very close, so the output of millivolts is usually sufficient and economical.
    如果您需要传感器输出放大,更容易使用另一个传感器与内置放大器。在长距离电缆或电气噪声高的地区,需要毫安输出或频率输出。在非常高的rf和emi环境中,可以考虑在ma和频率输出之外附加屏蔽或过滤设备。
    If you need sensor output amplification, it's easier to use another sensor with built-in amplifier. In areas with long-distance cables or high electrical noise, milliampere output or frequency output is required. In very high RF and EMI environments, additional shielding or filtering devices can be considered in addition to Ma and frequency output.
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