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3.3 Titration Parameters
3.3.1 General Titration Parameters
This section is only applicable if the titration parameters need to be changed in case of overshooting
the end point, speeding up the procedure etc. The maximum dose rate (mL/min), minimum dose
rate (mL/min), proportional band and delay times can all be set by the user.
•
The maximum dose rate is the mL/min of titrant addition when the pH or Millivolt reading is
outside the proportional band.
•
The minimum dose rate is the mL/min of titrant addition when pH is within 0.01 pH of the end
point or Millivolts is within 10 mV of the end point.
•
The proportional band is the number of pH units or the number of Millivolts away from the end
point at which titrant addition is slowed down to avoid overshooting. The addition rate is
slowed down from the maximum dose rate to the minimum dose rate gradually over this band.
•
The delay time is the number of seconds the
smart
CHEM
-Titro
will wait for when the end
point is reached before pronouncing the titration complete.
In the diagram below, the maximum dose rate is 10.0mL/min, the minimum dose rate is 0.2mL/min,
the proportional band is 1.00 pH and the end point is pH8.20.
To set the maximum dose rate…
1.
Select the Titration menu (
→
→
→
→
F4:Setup
→
→
→
→
F6:Titr.
).
2.
Select
F1:Max Rate
from the menu. The following screen is now displayed…
Enter Maximum mL/min
Addition Rate:10.0
Enter the maximum dose rate, from 5.0 to 20.0 mL / minute, and press
.