A-2
Appendix A Maintenance and Troubleshooting of this Device
Process piping
Process pressure uctuation
Pressure uctuation
detected by transmitter
Clogging
Connecting pipe
Function as a low-pass lter
The pressure frequency index, based on the number of times the pressure rises and falls, indicates
the frequency of pressure fluctuation. Clogging in the connecting pipe functions as a low-pass
filter that attenuates the high-frequency components of fluctuation, thereby decreasing the index
number. Because of this mechanism, clogging in the connecting pipe can be diagnosed from the
pressure frequency index.
In the case of differential pressure, the diagnosis of clogging is more complex, because the
difference between two pressure fluctuations must be calculated. However, the principle is the
same: the phenomenon in which the piping system and clogging in the connecting pipe function as
a low-pass filter is utilized.
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