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Appendix A Glossary
Page A.1
Appendix A Glossary
A
ADC
See Analogue to digital converter
Address
A number which uniquely identifies a location.
Alarm
An indicator which shows when a failure has occurred. Alarms are
classified as System, Input or Limit.
API
American Petroleum Institute
Analogue input
An input where information is received in analogue form.
Analogue output
An output from which information is transmitted in analogue form.
Analogue to digital converter
A circuit that converts analogue voltages or currents into digital (usually
binary) numbers which can then be processed by computers. The
digital signal gives the amplitude of the analogue signal at a particular
instant. See also Digital to analogue converter.
AUI
Short for Attachment Unit Interface, the portion of the Ethernet standard
that specifies how a cable is to be connected to a transceiver that plugs
into a 15-pin socket
B
Bar
A unit of pressure. 1 bar = 10
5
Nm
2
.
Base condition
Base or Standard Conditions give the volume which would have been
transferred if the temperature were at a pre-defined figure. The actual
values for base temperature and pressure vary from country to country.
Base density
Density of a fluid measured under base conditions.
British Thermal Unit
The energy required to raise the temperature of one pound of water
through one degree Fahrenheit.
BTU
See British Thermal Unit.
C
Calibrate
To assess the performance of an item of equipment against that of
another one whose accuracy is known.