OPSIS LD500 Analyser is the central unit in the laser diode gas monitoring system. It can house up to four laser diode heads. Each head is a complete laser control and data sampling system. The laser diode gas analyser provides very fast monitoring of a range of gaseous compounds. Several gases can be monitored and a multiplexer offers several monitoring paths. Typical compounds are carbon monoxide (CO), carbon dioxide (CO2), hydrogen fluoride (HF), ammonia (NH3), oxygen (O2), hydrogen chloride (HCI), water vapour (H2O), and methane (CH4).