4 Product description
17
• Time mark: time marks can be set for documentation by
pressing the START key for 3 seconds during the
measurement, e.g. when responsibility is switched to another
institution. A maximum of 10 time marks can be set. Setting a
time mark resets the values Min, Max, MKT and alarms.
• Acceleration (shock): the (positive and negative) acceleration
is measured in 3 measurement axes. Only those readings that
exceed the set limit value (maximum value per 1 second) are
stored and displayed.
The acceleration readings of the 3 measurement axes are
displayed separately on the display of the data logger.
The maximum cumulative value (peak) of the 3 measurement
axes is displayed in the PDF report.
• Report time zone: defines the time zone to which all time
specifications in the measurement report refer. Any time zone
changes during the measurement are not taken into account.
If the data logger was in rSt mode and could not be
reconfigured, configuration via a copy of an XML file
may result in the time & time zone not being correct.
• Reset mode (rSt): is triggered by an interruption to the power
supply, e.g. during battery replacement. A reconfiguration of the
data logger is required to resume operation. Data that has
already been recorded will not be affected.
• MKT (mean kinetic temperature): the MKT is a single calculated
temperature. MKT may be considered an isothermal storage
temperature. It simulates the non-isothermal effects of storage
temperature variations.
Calculation:
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Tmkt = mean kinetic temperature in degrees Kelvin
∆E = activation energy (standard value: 83.144 kJ/mol)
R = universal gas constant (0.0083144 kJ/mol)
T1 = average temperature in degrees Kelvin during the first time
period
Tn = average temperature in degrees Kelvin during the nth time
period
• MKT activation energy: the default activation energy is set at
83.144 kJ/mol, as recommended in USP <1160>. If other
estimates are available as a result of studies that have been
carried out, the activation energy can be customised.
• Individual alarm: an alarm is triggered when the set limit value
is exceeded.
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