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磁致伸缩位移传感器SSI与4-20mA信号对比

该内容围绕“SSI与4-20mA信号的优缺点,及博尔森(BRSEN)磁致伸缩位移传感器相关特性”展开,核心信息如下:

一、核心疑问

用户基于博尔森RH磁致伸缩位移传感器 datasheet 产生疑问:SSI版本内部采样频率仅500Hz但分辨率1μm,4-20mA版本分辨率低(7μm)但位置读取速度更快,想知道分辨率与每秒采样次数哪个更重要,同时需考虑两者的噪声差异。

二、传感器型号与性能澄清

1. 博尔森传感器系列

  • 目前主力系列为RH,仅隔爆型、卫生级等特殊设计仍沿用XH系列。
  • 油缸内置磁致伸缩位移传感器典型型号(RH系列):RH-SSB01-Mxxxx-Z-700,各代码含义如下:
    • SS:SSI信号,24位二进制上升沿输出,分辨率1μm;
    • B:支持同步工作模式(对RMC控制器至关重要);
    • Mxxxx:测量长度(单位mm,如120mm对应M0120);
    • Z:3/4英寸O型圈接口(适配油缸);
    • 700:7芯M16连接器。

2. 采样/更新频率澄清

  • RH的SSI版本并非仅500Hz:RH系列最高更新频率可达2000Hz,且所有磁致伸缩位移传感器的更新频率均受测量长度影响,该规律对SSI和4-20mA版本一致。
  • 单磁体配置的传感器,最大更新频率可达5kHz;以12英寸(约305mm)测量长度为例,更新频率仍能达到3kHz。

三、SSI与4-20mA信号关键对比

对比维度SSI(同步串行接口)4-20mA(模拟量)
分辨率更高(如1μm)更低(如7μm),且受噪声影响后有效分辨率进一步下降
抗噪声能力强(基于RS-422数字信号)弱(模拟信号易受干扰)
同步性支持与RMC控制器同步,无信号抖动无法与RMC同步,易产生信号抖动
核心优势高分辨率、抗干扰、同步性好,适合精密控制读取速度相对快(仅数据层面,非实际控制优势)
推荐度优先推荐(需指定“同步”选项)不推荐,仅在特殊低精度场景可用

四、补充说明

  • 不同信号版本的传感器内部检测部件一致,底层测量特性相似;差异在于测量的触发、选通及传输方式,这些差异会影响轴的控制效果。