Xylem SI Analytics TitroLine 7500 KF trace Manual De Instrucciones página 126

126
An example:
If the current drift shows a value of 1.5 µg/min and the stop drift is set to 2.0 µg/min, then the end drift actually to
be reached is 3,5 µg/min.
This means: The lower the entered stop drift, the longer takes the measurement. If a high stop drift (e.g. 20
µg/min) is entered, the measurement ends significantly faster. Low value = exact measurement, high value =
inexact measurement. As stop drift 2 µg/min are pre-set as standard value. The value can be entered from 0.01
to 25 µg/min.
160
140
120
100
80
60
40
20
0
0
Water [µg]
Diagram 1 shows on the left the titration curve with the measured variable water per time and the derived
variable drift per time.
4.6.3.8 Stop Drift Tolerance
As stop drift tolerance 0.02 µg/min is pre-set as standard value.
The value can be entered from 0.01 to 25.00 µg/min (Fig. 80).
Fig. 80
In case the drift stop has not been reached as criterion, as new stop criterion is the stop drift tolerance will be
used. It is the derivative of the drift with respect to time. Diagram 2 shows the typical progression of the stop drift
tolerance. Thus, the automatic stop of titrations with side reactions is possible
Water and Drift
20 40 60
[s]
Drift [µg/m in]
700
700
600
600
500
500
400 400
300
300
200
200
100
100
0
0
0
Drift [µg/min]
Drift and Drift tolerance
20 40
[s]
Drift Tolerance [µg/min2]
500
400
300
200
100
0
60