User's Manual

10 Remove the titration vessel from the titration arm.
11 Rinse the electrode with deionized water.
12 Repeat the last 3 steps for the buffer solution with pH 7.00 and the buffer solution with pH 9.21.
ð When the calibration is completed, the calibration data is automatically copied to the setup.
5.2.3.2 Test the pH-sensor
1 Tap Methods > New > Standard method templates > Sensor test.
ð A list of method functions appears.
2 Tap Sample (Calib).
ð The dialog Sample (Calibration) opens.
3 Make sure Sensor is set to DGi115-SC.
4 Make sure the settings for the buffer are as listed below.
Buffer 1: 4.01
Buffer 2: 7.00
Buffer 3: 9.21
5 Tap OK > Save
ð The new method is saved in the method list with the next free ID and with the title Sensor test.
6 Tap Start.
ð The dialog Start analysis opens.
7 To ensure that the system has no leaks, check all tubes and closing points for firm seating.
8 Tap Start.
ð The system asks you to attach the titration vessel with sample 1 to the titration arm.
9 Attach the tiration vessel with the buffer solution with pH 4.01 to the titration arm and tap OK.
ð The measurement starts after the stirring time.
ð During the measurement the online screen displays the time, measurement in [mV] and the curve.
ð During the pH-sensor test, the system will output a record on the printer.
ð When the measurement is completed, the system asks you to attach the titration vessel with the next
sample to the titration arm.
10 Remove the titration vessel from the titration arm.
11 Rinse the electrode with deionized water.
12 Repeat the last 3 steps for the buffer solution with pH 7.00 and the buffer solution with pH 9.21.
ð When the pH-sensor test is completed, the data is automatically copied to the setup.
5.2.4 Determining the titer
1 Weigh about 50 mg of potassium hydrogen phthalate and dissolve it in a titration vessel containing
deionized water.
2 Tap Methods > New > Standard method template > Titer with EQP.
ð A list of method functions appears.
3 Tap Sample (Titer).
4 Set the parameter Entry to Before and tap OK.
5 Tap Titration (EQP) > Termination.
6 Activate After number of recognized EQPs, set Number of EQPs to 1 and tap OK.
7 To exit the method function, tap OK
8 To save the new method, tap Save.
9 To ensure that the system has no leaks, check all tubes and closing points for firm seating.
10 Tap Start.
ð The Start analysis dialog opens.
11 Enter the sample size.
25Titration Excellence