Operating instructions
20 METTLER TOLEDO DE40/50/51 Density Meter
The earlier used term calibration should not be used anymore for this purpose as soon as
instrument settings are changed or adapted in order to ensure correct measurement values.
We recommend to select one method which you will dedicate to the adjustment:
Select
Stability 0
and Limit Time 0 s.
5.2.1 Clean the measuring cell
a) If you have a sampling pump ASU-DE:
- Insert the sampling tube into a beaker containing a high volatile solvent (e.g. acetone or
ethanol).
- Press the <PUMP> key . Flush the measuring cell during approximately 10 s. Adjust the
sampling speed with the
Sampling Adj
. control at the rear right side of the instrument so that
it takes approximately 5 s from starting the pump to fill the measuring cell (the solvent
appears in the drain tube at the top of the cell). During the pumping it is recommended to
remove the sampling tube from the beaker and insert it again to create some air bubbles.
This will result in a much more efficient cleaning.
- Remove the sampling tube from the beaker.
- Press the <PUMP> key again to stop the pump.
b) If you don't have a sampling pump ASU-DE (only a built-in air pump):
- Flush the measuring cell using a syringe filled with approx. 10 mL of high volatile solvent
(e.g. acetone or ethanol). Suck back the remaining solvant with the syringe.
5.2.2 Dry (purge) the measuring cell
If you have a sampling pump ASU-DE or not, the following steps will be the same:
- Insert the sampling tube into the dry air outlet (white connector without black ring).
- Keep the <PUMP> key pressed for approx. 2 s (until the message "Purge Checking"
appears on the display.
This Purge Checking will auto-
matically turn off the pump when the
cell will be dry, i.e. when the
oscillation value doesn't change
anymore.
Note: you can also stop the pump
yourself by pressing the
<PUMP> key .
Getting started
9.ADJUST 01-01
Temp.(°C) Oscillation
Set 20.00
Cell 20.00
Purge Checking
845393
Method 9 < Meas.Parameter > VA
Method Name :[ADJUST ]
Measurement Temp.:[ 20.00]°C
Stability :[0]
Limit Time :[ 0]s
Sequence : Off On