YSI IQ S ENSOR N ET VARiON Plus 700 IQ - Manual (Page 33)

VARiON
®Plus
700 IQ Matrix adjustment, check and calibration
4 - 3 ba76000e01 01/2012
4.2 Matrix adjustment
4.2.1 General information on matrix adjustment
This procedure adjusts the value directly measured in the test sample
to an independently determined reference value ("lab value"). To
determine the reference values, a sample is taken from the measuring
solution and the relevant concentrations are measured (e.g.
photometrically).
First select for which of the installed combination electrodes the matrix
adjustment should be carried out. Based on this selection and the
electrode equipment, the sensor software determines the ion types for
which a reference measurement must be carried out. The menu guided
routine adapts itself correspondingly and informs you of all necessary
actions.
4.2.2 Carrying out the matrix adjustment
Note
A chloride electrode should be checked for coatings and polished off as
necessary before the matrix adjustment is carried out (see section 6.4).
Main steps
Online help A comfortable, menu guided routine guides you through the matrix
adjustment. All steps are easily and understandably explained on the
display. In addition, you can call up an Online help for each step. To do
so, move the highlighting to the Online help menu item with the arrow
keys <
> or the toggle switch <> and press . A help
text with detailed information on the relevant operating step appears on
the display. It provides, for example, important instructions on how to
keep the correct basic conditions. When is pressed once again,
the display returns to the current operating step.
Matrix adjustment with
electrode zeroing
After installing a new or different electrode you have to zero the
electrode to facilitate a long-term evaluation. Details on electrode
zeroing, see section 4.1.
Step 1: Determination of all combination electrode voltages
("reference voltages"). The sensor is in the sample.
The procedure is started from the measured value display
with . After completion the system returns to the
measured value display.
Step 2: Sampling at the same place and time if possible and
determination of all relevant reference values
Step 3: Entry of the measured reference values. This step is
started by pressing again.