LABEC M-TIT-5 - Manual (Page 25)

7.2.1 mV/Ph Parameter
mV/pH titration parameter is used to indicate current titration is mV or pH titration. When user
selects mV titration, current titration is mV titration and all display are according to mV. Vice
versa.
7.2.2 End Point Number Parameter
End point number parameter indicates the total number in current preset end point titration.
Maximum is 5.
7.2.3 Pre-control Point Parameter
Pre pre-control point parameter tells user titration end point is coming and the meter need to
slow down the adding speed. The setting of this value will directly influence the correction of
final result and actual titration time. If pre-control point is set close to end point, when it
reached pre-control point, the result will be incorrect caused by the speed of titration too fast. If
pre-control point is set far from end point, the total titration time will be increased. Also
pre-control point should be set before end point, otherwise the pre-control point will be invalid.
The principle for setting pre-control point is: to the reaction of large jump, pre-control point
should be set far from end point potential (usually more than 100mV from end point potential).
And to the reaction of small jump, pre-control point could be set close to end point to quicken
the speed of titration.
NOTE: 1. When setting several end point parameters, the direction of end point potential of several
end points and pre-controlled point potential should be same, and it should be in right order,
otherwise the meter won't display "Start" on the bottom right corner of screen, as the result that
titration is unable to be made, e.g. the user has selected preset end point titration of two end points,
set the 1
st end point potential to "200mV", the 1 st pre-controlled point to "100mV", the second end
point to "-100mV", the second pre-controlled point to "0mV", that is mistaken setup.
2. If pre-controlled point is set in opposite direction, the meter will display "pre-controlled point is
set by mistake", e.g. potential is "100mV" when titration starts, while end point is set to "500mV",
pre-controlled point is set to "600mV", then the pre-controlled point is set by mistake, but it will do
if pre-controlled point is set to "50mV", the meter will enter slow titration when it starts working.
7.2.4 End Point Parameter
End point parameter is the known titration end point and just need to input
7.2.5 Time Delay Parameter
Time delay parameter means the delay time after titration reached set end point. Generally,
there will be potential wave near end point and set a certain time delay will let you get more
correct result. When meter judge the titration reached set end point, it will control titration
panel and let it pause, at this time, delay time starts. If potential returns back to set end point
before delay time finished, meter will go on titration till titration pass the end point and delay
time finished.
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