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What do I need to do with the “Perc” detector (PD1) if a “siren” sound is detected before a leak is pinpointed?

If the siren goes off- reset the unit. Resetting the unit gives the “Perc detector” a zero start reference. To rest the unit, take it out into some fresh air. Turn it off and then turn it back on. Please note: that the siren may alarm if the tip of the unit comes into contact with moisture or solvents. If this happens clean or replace the tip. Also note, the unit may also go off if a new battery is needed. Check the light on the unit- if the light is weak or blinking- it’s time for a new battery.