YSI IQ S ENSOR N ET VARiON Plus 700 IQ - Manual (Page 39)

VARiON
®Plus
700 IQ Matrix adjustment, check and calibration
4 - 9 ba76000e01 01/2012
Differences between
check and calibration
The check and calibration are carried out in two separate routines. The
schema is the same with both routines: Two standard solutions with
different concentrations are measured one after the other. The
differences between the check and calibration are as follows:
 For the check, the basic conditions to be kept are less strict. It is
suitable as a quick method to check whether the slope and potential
level of the combination electrodes are within the allowed limits. The
results are just for information. No characteristics or sensor settings
are changed.
 For calibration, the basic conditions must comply with very high
requirements (longer conditioning times, discarding of the
conditioning solution, temperature adjustment etc.).
Correspondingly, it requires more time. During calibration, the slope
and drift voltage are exactly determined and evaluated. If the
calibration was successful, the determined values can be taken over
for measurement. The procedure can, however, be used as a mere
check method. Calibration is documented in the calibration history
and in the log book.
Standard solutions For the check or calibration, the following two YSI standard solutions
are required in this order:
 VARiON ®
/ES-2 (high concentration)
 VARiON ®
/ES-1 (low concentration).
These standard solutions contain all ion types that come into question
(ammonium, nitrate, potassium and chloride) and are especially
adapted to the VARiON
®Plus
700 IQ.
Online help A comfortable, menu guided routine guides you through the procedure.
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 <OK>. 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 <OK> is pressed once again, the
display returns to the current operating step.
Calibration 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.
Note
A chloride electrode should be checked for coatings and polished off as
necessary before the check or calibration is carried out (see section
6.4).