公开(公告)号：WO1997048974A1

公开(公告)日：1997-12-24

申请号：PCT/US1997010208

申请日：1997-06-19

Applicant: THE FOXBORO COMPANY

Inventor： THE FOXBORO COMPANY ,  LOWE, Justin, Peter ,  CLARKE, David, W.

IPC: G01L09/00

CPC classification number: G01L27/007 ,  G01F1/34 ,  G01L15/00 ,  Y10T137/8326

Abstract: A differential pressure sensor is attached to a process via a high and a low pressure impulse line. An absolute pressure sensor is also attached to each impulse line. To determine if an impulse line is blocked, a noise signal is acquired from the corresponding absolute pressure sensor. A variance of the noise signal is determined and compared to a threshold. If the variance is less than the threshold, an impulse line blockage is indicated.

Abstract translation: 差压传感器通过高压和低压脉冲线连接到过程。 绝对压力传感器也连接到每条脉冲线。 为了确定脉冲线是否被阻塞，从相应的绝对压力传感器获取噪声信号。 确定噪声信号的方差并将其与阈值进行比较。 如果方差小于阈值，则表示脉冲线阻塞。