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    巫师之书

    发布时间:2023-04-01   点击次数:269次
     
      防腐型雷达液位计属于通用型雷达液位计,它基于时间行程原理的测量仪表,雷达波以光速运行,运行时间可以通过电子部件被转换成物位信号。探头发出高频脉冲在空间以光速传播,当脉冲遇到物料表面时反射回来被仪表内的接收器接收,并将距离信号转化为物位信号。
      防腐型雷达液位计利用了电磁波的特殊性能来进行料位检测。电磁波的物理特性与可见光相似,传播速度相当于光速。其频率为300MHz-3000GHz。电磁波可以穿透空间蒸汽、粉尘等干扰源,遇到障碍物易于被反射,被测介质导电性越好或介电常数越大,回波信号的反射效果越好。雷达波的频率越高,发射角越小,单位面积上能量(磁通量或场强)越大,波的衰减越小,雷达料位计的测量效果越好。
      防腐型雷达液位计常见的误差:
      1、测量死区:雷达液位计在测量中输出是4~30毫安的电流量,因为被测液体自身和摄像头的缘故,在它测量中有2个死区,分别为上死区和下死区。上死区液位到上机床坐标系中间能测到的最少间距,大概为0.5m~0.6m不一;下死区是在摄像头的底端,随之储存罐内真实液位仪转变,测量结果没有转变的部分。
      2、被测液体所导致的误差:在测量界位时,规定上边液体的导热系数必需比下边液位导热系数大12。要是二种页面导热系数相距并不大得话就会变为波型。测量时,因为液位仪和界位常用时间相一致,会使造成回到的2个数据信号重合一起,危害测量的结果。
      3、被测量的液体黏度过大:液体有很高的黏性,那样的液体很将会粘附在摄像头上,危害数据信号的传送,使测量造成误差;要是黏度更大时,将会出现媒质与摄像头合在一起,这时必须要对摄像头每季度清理。
      4、雷达液位计自身造成的误差:雷达液位计选用的是雷达探测技术性,造成误差绝大多数来源于于当场的安装。

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