Hach Ultra ORBISPHERE 510, Руководство оператора

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132 of 138 Glossary - Orbisphere 510/511/512 Analyzers
Operator Manual
ORBISPHERE
A.2 Generic Terms and Definitions
Table A-2: Generic Terms and Definitions
Terms Meaning
Absolute pressure
This is the total pressure in a system
(i.e. relative pressure, plus atmospheric pressure)
Analog output
A voltage or current signal that is a continuous function of the
measured parameter.
ASCII
American Standard Code for Information Interchange. A standard
character-coding scheme used by most computers to display letters,
digits and special characters.
Baud rate
Baud rate means transmission speed (Unit: bits per second, bps ),
especially for RS-232/422/485 interfaces.
CIP Cleaning In Place
Concentration The relative content of a component in a gaseous or liquid media.
Conductivity The reciprocal of electrical resistivity.
FIFO
(First In First Out)
FIFO is a concept to describe the behavior of a buffer. It means the
data which entered first will exit first.
Headspace The empty volume above a liquid or solid in a closed container.
Master / Slave modes
A device operating as a master will poll one or more devices
operating as a slave. This means a slave device cannot volunteer
information; it must wait to be asked for it.
Parallel communication
Parallel communication represents a connection in a computer
system in which the bits of a byte are transmitted over separate
channels at the same time.
PLC
Programmable Logic Controller. It communicates with other process
control components through data links. It is used in process control
for simple switching tasks, PID control, complex data manipulation,
arithmetic operations, timing and process and machine control.
PROFIBUS-DP
The PROFIBUS-DP (Decentralized Peripheral) fieldbus is designed
especially for communication between automation control systems
and distributed I/O at the device level. Each DP device has specific
parameters such as device version, baud rate, data format, I/O
length, user parameters, etc. These parameters are stored in a file
with .GSD extension.
PROFIBUS-DP
GSD files
The GSD file is provided by the manufacturer and is required for
device configuration. A GSD file is a readable ASCII text file that
contains both general and device-specific specifications for
communication (Communication Feature List) and network
configuration.
Relative pressure
Relative pressure is the over pressure in a system (i.e. absolute
pressure less atmospheric pressure). This is the customary gauge
reading.
Resistivity
The opposition offered by a body or substance to the passage
through it of a steady electric current.