Buchi KjelSampler K-377 Manual do Utilizador descarregar pdf (Página 126)

7 Maintenance

126 K-375/376/377 Operation Manual, Version B

The value shown for “Calibration volume” is updated.

NOTE

Repeat this procedure until the entered and the dosed volume correspond. An acceptable difference

at 50 mL is ±5 mL.

2O and NaOH can be dosed into the sample tube and then poured into a graduated cylinder for

measurement.

The H3BO3 can be dosed directly into the receiving vessel and then poured into a graduated cylinder.

7.3.2 Checking the distillate amount

• Carry out preheating (three times) so that the system is warm before performing this test.

• Create a new method using the following parameters:

H2O volume: 0 mL

NaOH volume: 0 mL

Reaction time: 0 s

Distillation mode: Fixed time

Distillation time: 300 s

Stirrer speed distillation: 5

Steam output: 100 %

Titration type: None

Aspiration sample tube: Yes

Aspiration receiving vessel: No

• Run the method with an empty sample tube and empty receiving vessel.

• Measure the distilled quantity in the receiving vessel using a graduated cylinder.

NOTE

The distillate amount with above parameters must be ≥ 130 mL.

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Buchi KjelSampler K-377 Manual do Utilizador Página 126