Metrohm MVA-21 - Manual (Page 10)

Application Bulletin 403/1 e
Installation instruction for MVA-21
4.2.4. Results
In the «Results» part on the tab «Results» the substance is
selected for which the concentration should be calculated
and displayed.
5. Operation
5.1. Suppressor determination series
5.1.1. Manual operation
•
Dosing Unit «894/D1 50mL VMS» connected to Dosino
1 has to be prepared with VMS.
•
Suppressor standard solutions and plating bath
samples are placed on position 57 to 111 of the sample
rack using the sample vials for 11 mL (6.2743.057).
•
On the position after the last sample a vial with pure
water is placed to rinse Dosino 4 after the end of the
suppressor sample series.
Fig 13: Example positions of solutions on the sample rack
6.2041.450 for suppressor determination
5.1.2. Workplace
•
In the «Run» window on the tab «Determination series»
create a sample table
Fig 14: Example sample table for suppressor determination
•
To run a calibration with a standard solution select
sample type S TANDARD . For a determination the sample
type S AMPLE has to be selected.
•
No «Sample amount» needs to be defined in the
sample table, since addition volumes for the standard
and the sample are defined in the method
commands ADD STD and ADD SAMPLE DT.
5.1.3. Course of events
•
The execution of calibration and determination by
dilution titration is controlled by the 894 Professional
CVS and viva.
a) The measuring vessel is emptied using the 843
Pump Station.
b) Dosing Unit «894/D4 2mL Std or sample»
connected to Dosino 4 is automatically rinsed and
prepared with suppressor standard or sample from
the vial on the rack of the sample changer.
c) The measuring vessel is rinsed using the 843
Pump Station.
d) Dosino 1 automatically adds the VMS and Dosino
4 is used for the automatic addition of suppressor
standard or plating bath sample.
e) At the end of each determination the measuring
vessel, is automatically emptied and rinsed using
the 843 Pump Station.
Next sample starts again from a).
•
Recalibration within a determination series is possible.
•
At the end of a determination series Dosino 4 is
automatically prepared with rinsing solution.
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