The Finnigan LCQ Deca is an advanced ion-trapped based analytical instrument that is capable of operating in both positive and negative ion modes and is primarily used to analyze bio-molecules in solution such as proteins, peptides, biopolymers and oligonucleotides.

It can be operated on a stand-alone basis with solution samples introduced by direct infusion using a syringe pump, or integrated with a Finnigan Surveyor LC system for LC/MS applications.