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12.2 Definitions and explanations
List of the definitions and explanations used in this document, please refer also to the
user manual.
Term
TermTerm
Term
Explanation
ExplanationExplanation
Explanation
Alarm Alarms are faults which jeopardize the correctness of the results. An
alarm is generated, for example, if a measurement is outside the
defined measuring range. The start and end of the alarm is entered in
the relevant error list with a time stamp. If the cause of the alarm no
longer exists, the alarm can be accepted and thus removed from the
error list.
Audit trail is a two-part protocol archive (parameter change archive) which
enables the user to conduct changes relevant to billing without
opening the SSW. These changes are monitored and documented in
the Fiscal section. If the SSW is opened, data are only included in the
General section.
Breather valve The breather valve, also known as the vent valve or flame barrier, is
designed to equalize the pressure on explosion-
operation. This pressure equalization device is required during
operation and must not be sealed.
Calibration gas is kept in a cylinder permanently connected to the device and is an
integral part of the measuring instrument. This is a mixture with
officially defined properties and is required for automatic calibration.
Calibration officer or representative is a person with country-specific authorization who
may carry out officially protected work on gas systems which are to be
used for fiscal measurements.
Carrier gas (mobile
phase)
The carrier gas (inert gas) carries the sample through the separation
column. The most commonly used carrier gases are helium, nitrogen
and hydrogen. The selection depends on the measuring task.
Carrier gas
is kept in a cylinder permanently connected to the device. This gas, for
example helium, carries the sample through the separation column of
the gas chromatograph.
Chromatogram
i
s the visual representation of the measurement results from a
chromatograph
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