静压式液位器水文测量中阻尼系数该怎么算?

来源:华恒仪表生产 发布时间:2020-10-09 17:34:50 浏览次数:

前国内主要通过浮子式水位计、压力式水位计、超声波水位计等技术进行水位的监测控制,存在着读数波动大、实时性差、投入成本高等缺点。基于扩散硅投入式液位变送器 进行了外围硬件电路与软件设计,并进行了水位测量实验。
In China, float water level gauge, pressure water level gauge and ultrasonic water level meter are mainly used to monitor and control water level. There are some shortcomings such as large fluctuation of reading, poor real-time performance and high investment cost. Based on the diffused silicon input liquid level transmitter, the peripheral hardware circuit and software are designed, and the water level measurement experiment is carried out.
静压式液位器水文测量中阻尼系数该怎么算?
How to calculate damping coefficient in hydrologic measurement of hydrostatic level gauge?
仪表的阻尼系数既是我们常说的阻尼时间,根据实际需要设定,单位为秒。一般来说当仪表的变化过于灵敏时可以适当增加阻尼时间,用手操器就可以很方便的设定。
The damping coefficient of the instrument is the damping time we often say, which is set according to the actual needs, and the unit is seconds. Generally speaking, when the change of the instrument is too sensitive, the damping time can be appropriately increased, and it can be set conveniently with the manual operator.
实验结果表明:设计的扩散硅投入式液位变送器 测量电路工作可靠,由于温度引起的*大温漂为0.07 mA/%,测量液位时的误差不超过0.04 in,精度较高。
The experimental results show that: the measurement circuit of the diffused silicon input liquid level transmitter is reliable, the * large temperature drift caused by temperature is 0.07 MA /%, and the error of measuring liquid level is not more than 0.04 in.
当样本大小n和合格判定数。增加时,现实OC曲线将远离线性曲线而向理想曲线接近。人们就是根据这种抽样特性的变化规律,采取调整n和A的方法,设计出具有所希望特性的抽样检查方案。下面举例说明一下百分比抽样的OC曲线。以10%的抽样方案,对任何一批量,从其中抽取10%的单位产品作样本。
When the sample size n and the qualified decision number. When increasing, the real OC curve will be far away from the linear curve and close to the ideal curve. According to the changing law of sampling characteristics, people design a sampling inspection scheme with desired characteristics by adjusting N and a. The following is an example of the OC curve for percentage sampling. With a 10% sampling plan, 10% of the unit products from any batch shall be sampled.
, 分别是液位计法、静压法和混合法。
They are liquid level gauge method, static pressure method and mixing method.
( 1 )液位计法( ATG ),主要用于体积交接的国家。 ATG 系统包括: ALG- 自动液位计; ATT- 自动温度计。
(1) The liquid level gauge method (ATG) is mainly used in countries with volume transfer. ATG system includes: alg - automatic level gauge; att - Automatic thermometer.
( 2 )静压法( HTG ),是指利用压力或差压变送器测量油品介质作用在罐底部静压的方法来测量储罐内介质的质量的方法叫静压法。
(2) Static pressure method (HTG) refers to the method of using pressure or differential pressure transmitter to measure the static pressure of oil medium acting on the bottom of tank to measure the quality of medium in storage tank.
( 3 )混合法( HTMS ),是把 ATG 与 HTG 两种系统混合成一种系统,具有以上两种系统的全部功能。 本文将重点探讨混合法计量的原理、计算模型以及如何提高它的计量精准度。混合法的基本原理:利用液位计测量得到液位 H ,压力变送器得到液位 H 高度下的静压力值 P ,单点温度计或多点平均温度计测量得到介质的温度,通过下面的公式可得到
(3) Hybrid method (HTMs) is to mix ATG and HTG into one system, which has all the functions of the above two systems. This paper will focus on the principle of mixed method measurement, calculation model and how to improve its measurement accuracy. The basic principle of the mixing method: the liquid level H is measured by the liquid level gauge, the static pressure value p at the height of the liquid level H is obtained by the pressure transmitter, and the temperature of the medium is measured by the single point thermometer or multi-point average thermometer, which can be obtained by the following formula
变送器都应该有阻尼时间设定。改变阻尼时间可以改变变送器的响应时间,使输出信号更平滑。如果控制系统对响应时间有要求(例如小于1s),那你要根据要求调整阻尼时间为1s。如果系统要求变送器输出不要变化太剧烈,那就把阻尼时间加长一些。
The transmitter should have damping time setting. Changing the damping time can change the response time of the transmitter and make the output signal smoother. If the control system requires response time (less than 1s for example), then you should adjust the damping time to 1s according to the requirements. If the system requires that the transmitter output should not change too much, then increase the damping time.
若样本中未发现不合格品,则接收这批产品;反之,则拒收这批产品。采用10%抽样的4种不同批量的经验抽样特性曲线如所示。
If no unqualified products are found in the sample, the batch of products will be accepted; otherwise, the batch of products will be rejected. The empirical sampling characteristic curves of 4 different batches with 10% sampling are shown in.
在每个抽样方案中,其样本大小n都是批量N的10%.根据经验,通常人们会认为,当抽样大小占批量的百分比一定时,则抽样的判别能力和风险率也应相同,但实际上并非如此。
In each sampling scheme, the sample size n is 10% of the batch n. according to experience, people usually think that when the sampling size accounts for a certain percentage of the batch, the discrimination ability and risk rate of sampling should be the same, but in fact it is not.
水位监测在航道船闸、码头、水库、水文站等场合起着至关重要的作用,目前,国内主要采用浮子式水位计、压力式水位计、超声波水位计等作为测量工具。
Water level monitoring plays an important role in navigation lock, wharf, reservoir, hydrological station and other occasions. At present, float type water level gauge, pressure water level gauge and ultrasonic water level gauge are mainly used in China.
但浮子式水位计受水底的淤积等影响较大,不能够实时的传送数据,还需要定时的进行人工维护,耗时耗力;压力式水位计容易受温度、水流的影响,导致读数不稳定;超声波水位计可以实时的传送数据,但是投入成本比较高,安装麻烦,受传播介质的影响也比较大。
However, the float type water level gauge is greatly affected by the sedimentation at the bottom of the water, which can not transmit data in real time, and it also needs regular manual maintenance, which is time-consuming and labor-consuming; the pressure water level gauge is easy to be affected by temperature and water flow, resulting in unstable reading; the ultrasonic water level gauge can transmit data in real time, but the investment cost is relatively high, the installation is troublesome, and it is also affected by the transmission medium Big.
扩散硅投入式投入式液位变送器 能够克服以上缺点,直接投入到被测量的液体中进行测量,不受水底淤积的影响,可以实时的进行数据传送,制作成本低,使用方便。
The diffused silicon input type liquid level transmitter can overcome the above shortcomings, and can be directly put into the measured liquid for measurement, which is not affected by the bottom sedimentation. It can transmit data in real time with low production cost and easy to use.


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