Xylem OxiTopIS OC100 - Manual (Page 60)

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60 BA31114e5 07/2006 BA31114e5 07/2006 61
Press ,
then set the time period for the
calibrating interval (1 - 36
months) using .
Default: 12 months.
Confirm by .
Memory
Here, you can set whether the controller should automatically erase the oldest
finished samples if the memory is full to create space for new measurement data
(setting “auto“).
With the “manual“ setting, the message “Lack of memory! Erase finished samples!“ is
displayed if the memory is full (See chapter “What to do if ...?).
“Settings“ menu:
Use
to select the “Memory“ submenu.
Erase memory is preset to
“automatic“.
To change it:
Press and
use to select between
automatic and manual and
use to acknowledge
it.
Return to the “Settings“ menu:
, then .
AutoTemp
The AutoTemp function controls the automatic start of the measurement after
checking the temperature adaption.
The pretemperature regulation to the precise incubator temperature is
recommended but not essential. Recommendation: e.g. regulate the temperature
of the sample for BOD5 measurements from 15 °C up to 20 °C.
You can tightly close the sample bottle with the measuring head immediately and
start the measurement. The AutoTemp function then automatically triggers the start of
the actual measuring after checking the temperature adaption. The measuring time of
the AutoTemp phase (adaption phase plus the test phase) is added to the sample
measuring time selected in the settings.
Pretemperature regulation of the sample
With the AutoTemp function switched on and, adhering to the recommendation
according to the table, the error quota that results from the temperature adaption of
the sample to the incubator temperature, T
Incubator , is smaller than 1% of the
selected measurement range final value.
Measuring time of the
measurement
Recommended sample temperature at the start of the
measurement
1 day T Incubator -0.5K ... T Incubator
2 days T Incubator -1K ... T Incubator
3 days T Incubator -2K ... T Incubator
4 days T Incubator -3K ... T Incubator
5 ... 99 days T Incubator -5K ... T Incubator
BOD5 15°C ... 20°C
AutoTemp function in detail
The AutoTemp function is made up of the adaption phase and the test phase.
Adaption phase
The phase without evaluation of the pressure process. The duration of the adaption
phase is defined for the various measuring times according to the table.
The adaption of the microbiology to the characteristics of the sample is made in this
phase and small temperature deviations, too high and too low temperatures of the
sample, can be compensated.
Test phase
The phase in which the further pressure process direction in the sample bottle is
checked. The test phase is defined for various measuring times according to the
table. In this phase, the continuing temperature deviation can be compensated if the
temperature of the sample is too low.