DURAG D-R 290, Operating Manual

Page: 195 / 202

10 Glossary
D-R 290 195
10 Glossary
Auto-collimation principle
The collimator (Latin) is a device for generating a
parallel beam path. In optics, auto-collimation is
understood to mean imaging systems in which
the object is in the same plane as the image. In
the process, semi-transparent mirrors enable the
lens of the collimator to be used simultaneously
as the lens of the measuring instrument, thus as
far as possible eliminating lens and set-up er­
rors.
D-ESI 100
The D−ESI 100 software is a graphical interface
for operating and managing sensor devices. The
software simplifies the checking and where nec­
essary the parameterisation of bus-based
DURAG devices. D−ESI 100 allows individual
devices or multiple devices connected via a
DURAG - Modbus or USB cable to be identified.
Setting parameters (depending on the capabili­
ties of the device concerned) can be read and
edited, and measurement results displayed or
recorded for maintenance purposes. D-ESI 100
is used on site by maintenance teams and by
DURAG service engineers.
D-ISC 100
The D‑ISC 100 universal operation unit was de­
signed for the new generation of DURAG devi­
ces. It replaces the various different control, dis­
play, evaluation and supply units used by those
devices, and creates uniformity in their supply
and operation.
EPA
The US Environmental Protection Agency, or ei­
ther EPA or US EPA for short, is a governmental
organisation of the United States of America
concerned with the protection of the environment
and the protection of human health.
Extinction
<lat.>: including (phys.) Attenuation of a wave
movement (radiation) when passing through a
medium Extinction is also referred to an optical
density. By conversion of the transmission into
extinction and after a gravimetric comparison
measurement, the display is output in mg/m³. By
calculation based on the reference variables T,
P, RF for dust concentrations this result is given
in mg/Nm³.
Gravimetry
<lat.>: including (chem.) Measurement analysis;
procedure for quantitative determination of ele­
ments and groups in substance mixtures.
Hysteresis
(Greek: hysteros = afterwards) refers to the con­
tinuation of an effect after the removal of its
cause. This phenomenon occurs in a wide range
of scientific fields. For the fail-safe shutter it is
used to program the tolerance that the system
permits with respect to the air flow setting before
the shutters are opened or closed. This avoids
continually opening and closing of the shutters
because of normal fluctuations in the air flow.
In situ
The term in situ (Latin for at the (original) loca­
tion, on the premises, "on the spot") in environ­
mental technology denotes the execution of de­
fined procedures on site.
Integration time
The values are measured at the time intervals
defined in the measurement system. However,
for various reasons display of the individual
measured values is unimportant, it is rather a
median value over an adjustable period of time
that is required. This time period is defined by
the integration time.
Isopropanol
Isopropanol or isopropyl alcohol (abbreviated as
IPA), also known as 2-propanol, is an alcohol
Modbus RTU
(RTU: Remote Terminal Unit ) The Modbus pro­
tocol is a communications protocol that is based
on a master/slave or client/server architecture.
Modbus has become a de facto standard in in­
dustry, as it is an open-source protocol. A mas­
ter (e.g. a PC) and several slaves (e.g. measure­
ment and control systems) can be connected us­
ing Modbus.
Offset or adjustment offset
Offset (displacement, distance) in this manual
denotes a static value which is added to or sub­
tracted from a measured value, for instance to
adjust the zero value.
Opacity
-<Latin>: (optics) non-transparency. A light beam
is transmitted through a mixture of gases and
particles and is thereby attenuated due to ab­
sorption and scattering. The more particles there
are in the light beam, the higher the degree of