Differential pressure measurement is the difference in pressure between two points in a system.
For filtration applications, the upstream side [A] is positioned before the filter [B], whereas the downstream side [C] is after the filter.
A differential pressure sensor can be used to monitor the cleanliness of a filter in either liquid or gas applications.
A 100 PSI pump with a filter is installed to purify the water for drinking. If the downstream side in the system pressure drops to 80 PSI, the filter should be cleaned or maintenance required.
With a 24VDC supply powering the sensor and a 4-20mA output signals elected, the sensor will be calibrated with a 100 PSI line pressure and 20 PSI differential pressure.
When the system is operating with a clean filter, the output signal will be 4mA. As the pressure decreases on the downstream, the output signal will increase.
Once the downstream pressure has been reduced to 80 PSI, the sensor’s output signal will reach the full scale of 20mA. When connected to a controller/HMI, the operator understands when to replace the filter.
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Your articles shows a in depth knowledge and understanding about various concepts of instrumentation. Thank you so much for showing up.
Great info.