Damping pressure gauge fluctuations

We will be monitoring room pressure with a very low pressure (+/- 0.1 w.c.) differential transducer. There is air circulating in the room because of fans. I would welcome suggestions as to how to eliminate pressure fluctuations seen by the transducer.


I bought 10’ lengths of 0.020" ID capillary tubing, brazed one end to a pipe fitting (that fit the process connection port on the pressure transmitter), stuck the other end of the capillary into a hole I drilled into a scintered filter, and super-glued the OD of the capillary to filter. This cut the oscillations dramatically.

I honestly don’t know if the scintered filter or the long capillary had the greater effect.

There also the approach of averaging at whatever is taking the pressure readings.

Above is a snippet.