Mettler Toledo GA42 Operations Instructions download pdf (Page 21)

METTLER TOLEDO DE40/50/51 Density Meter 21

5.2.3 Performing the air adjustment

Whether you have a sampling pump ASU-DE or not, the following steps will be the same:

- Press the <CALIB.> and follow the directions on the display:

If the cell is really clean and dry,

press <ENTER>.

While adjusting to the air value the

display shows:

Wait until the next message is

displayed.

5.2.4 Performing the water adjustment

- Open a vial of certified water (one of the five delivered water standards). This water will be

used for the adjustment.

Note: you can also use bi-distilled water, but we recommend to use our certified water for

traceability.

a) If you have a sampling pump ASU-DE:

- Remove the sampling tube from the measuring cell.

- Remove the drain tube connection from the ASU-DE pump (white connector with black ring).

b) The next steps will be the same wether you have a sampling pump ASU-DE or not:

- Pierce the septum of the certified water standard with the tip of the syringe.

- Fill the syringe with approx. 8 mL of certified water.

- Remove the tip of the syringe and insert the syringe in the sample inlet (lower measuring tube

connection).

- Perform an analytical rinse, i.e. fill approx. 2 mL carefully, wait for 10 s without removing the

syringe, then fill in again 2 mL very carefully. During the filling watch carefully that no air

bubbles enter the measuring cell.

Getting started

9.ADJUST 01-01

Temp.(°C) Oscillation

Set 20.00

Cell 20.00

Purge OK?

845393

9.ADJUST 01-01

Temp.(°C) Oscillation

Set 20.00

Cell 20.00

Set Water

845393

9.ADJUST 01-01

Temp.(°C) Oscillation

Set 20.00

Cell 20.00

Calibrating

845393

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Mettler Toledo GA42 Operations Instructions Page 21

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