Xylem OxiTopIS OC100 - Manual (Page 63)

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62 BA31114e5 07/2006 BA31114e5 07/2006 63
Sequence of the test phase:
With a further drop in pressure (consumption) or constant pressure after the adaption
phase, the pressure value at the end of the adaption phase is the starting point of the
measurement.
On a further increase of pressure following the adaption phase (the sample is still too
cold), the turning point of the pressure process at which the pressure increase
changes into a pressure drop, is the starting point of the measurement.
If no starting point is found (according to the procedure given in points 1 and 2) after
the termination of the AutoTemp phase (time limit exceeded), the last measuring point
of the AutoTemp phase forms the starting point.
This means that the BOD curve in the graphical evaluation does not emerge from the
coordinate origin at the zero time point. A sample that was too cold was started.
BOD measuring
time Adaption phase duration Test phase duration
0.5 to 23 hours Since the measurement times are very short, the system
always suppresses the AutoTemp phase here even if the
AutoTemp function is switched on in the settings.
1, 2, 3, 4, 5 days
14, 28, 42, 56, 70 minutes Maximum of 28, 56, 84, 112,
140 minutes
6 to 99 days
in a 1 day pattern 70 minutes Maximum of 140 minutes
Switch the AutoTemp function on or off (only in the standard BOD operating mode):
“Settings“ menu:
Use
to select “AutoTemp“ submenu.
AutoTemp is preset to “On“.
To change:
Press
and use to select
between AutoTemp “On“ and
“Off“ and
use to confirm it.
Return to the “Settings“ menu:
, then .
Switch-off interval
The time interval after the last time a key is pressed can be set here. After this time
interval expires, the controller switches itself off to save energy. (Settings of 5 to 15
minutes are possible, only in the standard BOD operating mode.)
“Settings“ menu:
Use
to select the “Switch-off interv.“
submenu.
The switch-off interval is preset to
5 minutes.
To change it:
Press and
use to set the no. of
minutes required and
again to confirm it.
Return to the “Settings“ menu:
,then
.