Appendix B - Glossary; Terminology - Honeywell Searchline Excel Cross-Duct Technical Handbook

MAN0889_Issue 3_03/13 Searchline Excel Cross-Duct Technical Handbook

Appendix B - Glossary

B.1 Terminology
Ex d
Flame proof or explosion proof within the confines of the European series of standards EN60079. An enclosure
that can withstand the pressure developed during the internal explosion of an explosive mixture and that
prevents transmission of the explosion to the explosive atmosphere surrounding the enclosure.
Ex e
Increased safety within the confines of the European series of standards EN60079 applied to electrical apparatus
that does not produce arcs or sparks in normal service, in which additional measures are applied so as to give
increased security against the possibility of excessive temperatures.
Instrument Assisted Alignment (IAA)
A method of commissioning the Excel system using the associated electronic Handheld Interrogator device.
The process will not allow the Excel system to initialise unless the alignment of the Receiver and Transmitter
is correct and the signal strength is correct.
IS
Intrinsically safe, apparatus in which the circuits themselves are incapable of causing ignition of a flammable
gas.
Lower Explosive Limit (LEL)
The volume of flammable gas or vapour in air below which an explosive gas atmosphere will not be formed.
RS485
An industry-wide serial communication link protocol.
Turbo heating
Increased Transmitter window heating at low operating temperatures.
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