ABB Totalflow NGC8206 Manual Del Usuario página 259

TERM
Circuit board
Class 1, Division 1
Class 1, Division 2
Class 1, Zone 0
Class 1, Zone 1
Class 1, Zone 2
Clean Gas
Clear
Clock
Closed Circuit Voltage
CM
2103650-001 – rev. AB
Sometimes abbreviated PCB. Printed circuit boards are also called
cards. A thin plate on which chips and other electronic components are
placed. They fall into the following categories:
Motherboard: Typically, the mother board contains the CPU, memory
and basic controllers for the system. Sometimes call the system board
or main board.
Expansion board: Any board that plugs into one of the computer's
expansion slots, including controller boards, LAN cards, and video
adapters.
Daughter Card: Any board that attaches directly to another board.
Controller board: A special type of expansion board that contains a
controller for a peripheral device.
Network Interface Card (NIC): An expansion board that enables a PC to
be connected to a local-area network (LAN).
Video Adapter: An expansion board that contains a controller for a
graphics monitor.
Class 1 refers to the presence of flammable gases, vapors or liquids.
Division 1 indicates an area where ignitable concentrations of
flammable gases, vapors or liquids can exist all of the time or some of
the time under normal operating conditions.
Class 1 refers to the presence of flammable gases, vapors or liquids.
Division 2 indicates an area where ignitable concentrations of
flammable gases, vapors or liquids are not likely to exist under normal
operating conditions.
Class 1 refers to the presence of flammable gases, vapors or liquids.
Zone 0 refers to a place in which an explosive atmosphere consisting of
a mixture with air of flammable substances in the form of gas, vapor or
mist is present continuously or for long periods or frequently.
Class 1 refers to the presence of flammable gases, vapors or liquids.
Zone 1 refers to a place in which an explosive atmosphere consisting of
a mixture with air of flammable substances in the form of gas, vapor or
mist is likely to occur in normal operation occasionally.
Class 1 refers to the presence of flammable gases, vapors or liquids.
Zone 2 refers to a place in which an explosive atmosphere consisting of
a mixture with air of flammable substances in the form of gas, vapor or
mist is not likely to occur in normal operation.
Gas that has no particles larger than one micron and no more than one
milligram of solids per cubic meter.
To restore a device to a prescribed initial state, usually the zero state.
The source(s) of timing signals for sequencing electronic events (e.g.
synchronous data transfer).
The difference in potential between the terminals of a cell/battery when
it is discharging (on- load condition).
Acronym for Cubic Meter.
DEFINITION
Página B–13