EMB ERJ 135 ER/LR
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed As Precaution; General Declared Emergency
Aircraft
Preflight indicated normal oxygen operation; and a pressure of about 1;900 PSI. At cruise at FL280; we got an OXYGEN LO PRESS annunciation. We declared an emergency; and as per checklist we descended to 10;000 feet. We decided it was safest to divert to ZZZ; as it was the closest airport from our descent. Dispatch was informed; and concurred with our choice of declaring an emergency and diverting to ZZZ. Dispatch informed us we were over maximum landing weight and needed to burn off fuel before landing. We were vectored by Approach at 10 thousand feet in the northern vicinity of the airport until we did not exceed maximum landing weight. The weather was VFR; the approach and landing were normal and without incident. During the post flight inspection we found the 'oxygen disc' had burst in flight; causing the loss of oxygen.
EMB-135 First Officer experiences an OXYGEN LO PRESS annunciation at FL280. An emergency is declared and descent initiated with diversion to a suitable alternate. Post flight reveals that the oxygen blow out disc had burst in flight.