In the maintenance of the instrument, because the pressure transmitter pressure tube discharge is not timely, or the media is dirty, sticky and other reasons, positive and negative pressure tube clogging is a frequent occurrence, usually the positive pressure tube is plugged: transmitter The output drops, rises or does not change.
When the flow rate increases, the output of the transmitter (the transmitter output signal squared) is affected by the positive pressure tube plugging, when the actual flow is F1, F1, P1 + = P2;
When the actual flow rate is reduced from F1 to F2, the static pressure in the pipeline is also reduced accordingly, and the reduction value is set to P0. At the same time, when the actual flow rate decreases to F2, the P2-value also increases due to the decrease of the fluid flow rate in the pipe. High, set the increase value to P0'.
At this time, the relationship between P2- and P1- is that, under normal circumstances, the main cause of blockage of the pressure guiding pipe is due to the irregular discharge of the measuring pressure pipe or the measurement of viscous medium or particles.
When the flow rate increases, the output of the transmitter (the transmitter output signal squared) is affected by the positive pressure tube plugging, when the actual flow is F1, F1, P1 + = P2;
When the actual flow rate is reduced from F1 to F2, the static pressure in the pipeline is also reduced accordingly, and the reduction value is set to P0. At the same time, when the actual flow rate decreases to F2, the P2-value also increases due to the decrease of the fluid flow rate in the pipe. High, set the increase value to P0'.
At this time, the relationship between P2- and P1- is that, under normal circumstances, the main cause of blockage of the pressure guiding pipe is due to the irregular discharge of the measuring pressure pipe or the measurement of viscous medium or particles.
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