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. The effect on the output of the transmitter (the output signal of the transmitter itself) when the flow rate increases.
As the positive pressure tube is blocked, when the actual flow rate is F1 and F1 respectively, P1+=P2+;
When the actual flow rate is decreased 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. , set the increase value to P0.
Under normal circumstances, the main reason for pressure-conducting pipe plugging is due to the irregular discharge of the measuring pressure pipe and the measurement of viscous medium and particulate matter.
As the positive pressure tube is blocked, when the actual flow rate is F1 and F1 respectively, P1+=P2+;
When the actual flow rate is decreased 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. , set the increase value to P0.
Under normal circumstances, the main reason for pressure-conducting pipe plugging is due to the irregular discharge of the measuring pressure pipe and the measurement of viscous medium and particulate matter.
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