针表盘真空压力表,0 至 30 inHg,带 1/4 英寸 NPT 外螺纹黄铜接头

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指针式真空压力表,0 至 30 inHg,带 1/4 英寸 NPT 外螺纹黄铜接头

这些指针式压力表适用于快速且廉价地测量真空压力。它们设计用于读取 0 至 30 in Hg 范围内的值。每个压力表背面都有一个 1/4 外螺纹 NPT 管螺纹,用于进行真空连接。

波登式指针式真空压力测量表,由 Wikapedia.org 提供
波登式压力表使用盘管,当盘管因压力增加而膨胀时,会导致连接到管上的臂旋转。压力传感元件是连接到要感测压力的腔室或管道的封闭盘管。随着表压的增加,管子会趋于松开,而表压的降低会导致管子卷得更紧。这种运动通过连杆传递到与指示针相连的齿轮系。指针位于卡片正面,卡片上刻有与特定指针偏转相关的压力指示。在气压计中,波登管两端密封,可感测周围大气的绝对压力。波登压力表测量相对于大气压的压力,即它们直接测量相对于周围大气压的压力。例如,我们位于新墨西哥州阿尔伯克基的工厂海拔 5,000 英尺,大气压为 630 毫米汞柱。在海平面(760 毫米汞柱)校准的波登压力表将读取我们所在地的真空度约为 5 英寸汞柱。

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