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The PS-525 incorporates reservoirs (holding tanks) for both the vacuum and pressure systems. The pressure and vacuum levels within these tanks are reflected in the pressure and vacuum gauges on the front panel. These gauges enable the operator to monitor the pressure and vacuum, and then activate the pump switch for the system on an as-needed basis. This eliminates the need to keep the pumps turned on at all times, and extends the pump life and battery charge. The gauges also enable the operator to see if the pressure or vacuum levels are dropping quickly, in the case of a leak in the aircraft system, and respond accordingly.
A pneumatic diagram of the PS-525 test box is as follows: