BUCHI KjelSampler K-377 - Manual (Page 58)

5 Putting into operation
58 K-375/376/377 Operation Manual, Version B
5 .9 .2 Preparing the hardware
There are only a few tasks that have to be performed in order to prepare the hardware for the first
use:
Calibrate the pumps for H
2
O, H
3
BO
3
and NaOH
HOME  System Preparation  Pump calibration
• Select the pump to be calibrated (H
2
O, NaOH or H
3
BO
3
).
• Enter the target “Dose volume”, e.g. 50 mL.
• Press
START to start the calibration procedure.
• Measure the actually dosed volume and enter it as calibration volume in the displayed screen.
Repeat the calibration procedure, until the measured and the dosed volume correspond.
• An acceptable difference at 50 mL is ±5 mL.
NOTE
H
2
O and NaOH can be dosed into the sample tube and then poured for measurement into a gradu-
ated cylinder.
The H
3
BO
3
can be dosed directly into the receiving vessel and then poured into a graduated cylinder.
Rinsing of the buret and the titration hoses
HOME  System Preparation  Buret functions  Dose
Dose some liquid to a waste vessel to rinse the buret and the titration hoses. Repeat the rinsing, until
the whole buret and all the titration hoses are filled with titration solution. Make sure there are no air
bubbles in the buret or in the titration hoses.
Calibration of pH electrode
HOME  System Preparation  Calibration pH electrode
Calibrate the pH electrode by following the instructions on the screen (see chapter 6.6.1).
NOTE
We recommend to calibrate the pH electrode regularly (e.g. every morning) with buffer solution
pH 7 and pH 4.