Metrohm 824 Easy Sample Changer - Manual (Page 36)

4.2 Method labels
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824 Easy Sample Changer, Standard methods
4.2 Method labels
On the keyboard covering film you will find a gray marking field with 4
lines. You can enter a short description for each of the four sample
changer methods.
Use a soft pencil or waterproof marker for the labels.
When choosing a marker make sure that the writing can easily be
wiped off with alcohol. Pencil markings can be removed with a soft
rubber.
A brief description of the standard methods of the 824 Easy Sample
Changer is given below.
4.3 Method 1
Use:
For simple titrations (including KF titrations) or pH measurements (with-
out calibration). The initial addition of auxiliary reagents or solvents is
possible.
Required instruments:
• Metrohm titrator (Titrino or Titrando) or pH meter
• Metrohm Dosimat (optional)
• Metrohm 802 Rod Stirrer or 741 Magnetic Stirrer
Features:
No electrode rinsing after sample processing. The electrode is im-
mersed in the conditioning beaker at the end of a series of samples.
Preparation:
Fill a sufficiently large conditioning vessel with a suitable solvent and
place it in the highest rack position.
Procedure:
• (Start sequence) Initialize the sample changer
• Move to sample and lower lift to working position
• Switch on stirrer
• If a Dosimat is connected (optional): add auxiliary reagent or sol-
vent and wait until addition is completed
• Start titration/measurement and wait until it is completed
• Switch off stirrer
• Move lift to rotating position and allow electrode to drip
• (Final sequence) Move to conditioning beaker and immerse elec-
trode