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		Control and Instrumentation Glossary Search for another term in our Glossary        LAN - Local Area Network A data communications network which is geographically limited (typically to a 1 km radius) allowing easy interconnection of devices. Ethernet is an example of a standard LAN. Further Reading   LCIE French based Notified Body Further Reading   LED Light Emitting Diode Further Reading   LEL - Lower Explosive Limit Below the LEL a mixture of substance and air lacks sufficient fuel (substance) to burn. Further Reading   LER Local Equipment Room Further Reading   LFL Lower Flamability Limit Below the LFL a mixture of substance and air lacks sufficient fuel (substance) to burn. Further Reading   Linearity The closeness to which a curve approximates a straight line or the deviation of an instrument's response from a straight line. Further Reading   LNG - Liquefied Natural Gas Natural gas (mainly methane) refrigerated to reach liquid phase suitable for transportation in specialised vessels or by pipeline. Further Reading   LOM Spanish based Notified Body Further Reading   LOPA - Layers of Protection Analysis A semi-quantitative risk analysis technique. LOPA results are intended to be conservative (overestimating the risk) and usually adequate to understand the required safety integrity level. Further Reading SIL Ratings Toolbox Page   LOS Line of Sight Typically used with reference to telecommunication devices. Further Reading		Sponsored Links
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