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Control and Instrumentation Glossary

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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

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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

 

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