热电阻测量原理及操作。
原理:利用热敏电阻在一定温度范围内,电阻值与温度值存在线性关系的测温原理。常见的热电阻有:铂电阻、铜电阻、锰电阻、碳电阻。
操作:热电阻在测量传送电阻信号时,采用的三线制,这是为了在传送时,减少因导线的阻值而引起的测量误差。在检查其阻值时,要注意哪两根线为公用线。
热偶测量原理及操作。
原理:两块不同的金属一头连接在一起,另两头之间就有电势差并且在一定的范围内其电势差与温度存在线性关系。
操作:采用两线制,检查时,检测其阻值应很小。
压力变送器测量原理及操作。
原理:薄膜金属应变测量元件。
操作:在连线时,注意接线的正负极。在使用时应缓慢地打开手阀,避免对膜盒的瞬间冲击,检查仪表接口有无泄露,以免引起测量误差。在拆下时,应先关闭手阀,在确定手阀已关闭的情况下,缓慢地卸表,边卸边晃动变送器,以便放出剩余气体。
差压式液位计的工作原理。
原理:充硅油的测量盒的膜片经两个偶合管脚联合,差压经操作棒造成一种引起扭曲杆变形的力,扭曲杆被放在薄膜式应变电阻被排列成为一惠斯登电桥以将压差转换为一均衡的电压信号。电子放大器将测量室的信号转换为二线制4–20mA DC输出信号并且可提供惠斯登电桥。
操作:在连线时,注意接线的正负极。在使用时,应先打开变送器的平衡阀,关闭高低压室的手阀,打开高低压室引压管线上的手阀,缓慢地打开高低压室的手阀,然后关闭平衡手阀即可。
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