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		Control and Instrumentation Glossary Search for another term in our Glossary        ED - Explosive Decompression Phenomenon whereby seals of a valve (or similar) absorb high pressure gas and when the system is depressurised the seals release their pressure causing failure. Further Reading   EEMUA Engineering Equipment and Materials Users Association Further Reading   Elevated Zero A range in which the zero value of the measured variable exceeds the lower range value. Further Reading   EMC ElectroMagnetic Compatibility Further Reading   EN - EuroNorm Standard issued by CEN/CENELEC normally prefixed by the national issuing body e.g. BS EN Further Reading   End of Line Name given to resistors added to a circuit for line monitoring i.e. end of line resistors. Often used in circuits containing fire and gas detection equipment. Further Reading   EPA Environmental Protection Agency A US government agency that issues emissions standards and monitoring policies for environmental pollutants in air; water and soil. Further Reading   Equal Percentage An equal percentage valve trim is machined so that an equal increment of stem travel produces an equal change in flow through the valve Further Reading   Error The difference between the measured signal and the true value. Further Reading   ESD - Emergency Shutdown System An automatic system for shutting down plant in a prescribed orderly manner to prevent escalation of a potentially hazardous situation Further Reading   Exia Explosion protection by means of the concept of Intrinsic Safety where protection is maintained with up to 2 component or other faults Further Reading   Exib Explosion protection by means of the concept of Intrinsic Safety where protection is maintained with up to 1 component or other fault Further Reading   Extension Cable Cable whose wires are nominally the same conductors as the thermocouple to which it will be connected. Extension cables possess similar though not identical thermo-electric characteristics as the thermocouple which mitigates connection problems. Further Reading		Sponsored Links
Glossary   C&I Glossary Relief Valve Glossary Engineering Glossary Nuclear Glossary   C&I Resources   ATEX Cable Gland Selector CE Marking Flange Dimensions Ingress Protection Pipe Schedules Relief Valve Orifice Size Temperature Class Temperature Conversion Thermocouple Types Valve Leakage Vortex Meters Wires and Cables

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