A Flight Attendant reported that he regularly finds Airbus aircraft escape slide pressure gauges to have low pressure.

Narrative

I am writing about Airbus door pressure gauges. Today; two doors on the A319 on the leg out and the A320 on the way back. Both planes had lower pressure door gages indicators (1500 PSI). Mechanics filled the bottles to appropriate PSI number and we left without incident. However; this is an issue that does not seems to get fixed or is being overlooked. I will continue to write these incidents. However; I can only imagine how many doors on a daily basis are not properly filled to the appropriate PSI. This is a chronic issue at my air carrier. However if I am the only one doing the checks because I have found the problem to be consistent. I would suggest taking this issue from the mechanics and given them to the flight attendants to check these doors as a safety check (as we've done in the past). In order to be able to look at the gauges and know which PSI number it is supposed to fall under; it should be printed on a door sticker of all airbuses. Therefore; the flight attendants will know what the correct PSI and temperature is for that day. Either way this problem is unacceptable. Every day that I take an Airbus out I find doors with low pressure gauges.