api5000AB Sciex API 5000 Triple Quad LCMS. The AB Sciex API 5000 Triple Quad LCMS is a cutting-edge mass spectrometer desned for laboratories that demand superior sensitivityAPI 5K API 5K means an API-defined BOP confuration with a rated working pressure of 5,000 psi and as described in API RP 53, adopted by reference at 20 AAC 25.527(c).