IR Microsystems "microLGD" is a stand-alone system or OEM sub-mount for continuous monitoring of gases like NH3, H2O, CO2, O2 and CH4. Based on state-of-the-art Tunable Diode Laser Spectrometry (TDLS), the system has virtually no cross-sensitivity with other gases and features an innovative, patented measurement principle without the need for a reference-channel. The subsystem comprises a microprocessor-driven read-out module with digital and analog data outputs for industry-standard connectivity, as well as a modular laser measurement head. The unit is built ready-to-use for rapid OEM integration into stand-alone units, detector networks or explosion-proof housings.