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Glossary
MicroSAM
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Operating Instructions, 06/2012, C79000-G5376-C560-07
Gas chromatography (GC)
Gas chromatography is an analytical method used worldwide to separate mixtures into
individual chemical compounds. GC can only be used for components which are gaseous or
can be vaporized. With this type of chromatography, an inert gas is used as the mobile
phase, usually nitrogen, helium or hydrogen. The carrier gas is passed through a tube or
capillary with a defined internal diameter, the so-called "Column". Older columns are made
of metal, newer columns of quartz glass which are coated to increase the resistance to
breakage. The column is internally lined with a defined stationary phase, frequently with
viscous polysiloxanes.
Ketones
Ketones are chemical compounds containing a non-terminal carbonyl group (>C=O) as the
functional group. Ketones are oxidation products of secondary alcohols. The ketones derived
from the alkanes are also referred to as alkanones. The simplest ketone is acetone
(propanone or dimethyl ketone).
MEMS: Micro Electro-Mechanical System
MEMS is a combination of:
● mechanical elements,
● sensors,
● actuators,
● electronic circuits
on a substrate or chip.
Modbus
The Modbus protocol is a communications protocol based on a master/slave or client/server
architecture. The Modbus protocol was defined by Modicon in 1979 for communication with
its programmable controllers. Modbus is a de facto standard in industry, since it is an open
protocol.
Modbus is used to connect a master (e.g. a PC) and several slaves (e.g. measuring and
control systems). There are two versions of Modbus: one for the serial interface and one for
Ethernet.
Molecular filter
Molecular filter (or also molecular sieve) is the term for naturally occurring and synthetic
zeolites which have a strong adsorption capacity for gases, vapors and dissolved materials
with certain molecular sizes. Appropriate selection of the molecular sieve permits molecules
of different sizes to be separated.