wtw AmmoLyt Plus 700 IQ, Operating Manual

Page: 36 / 62

Matrix adjustment, check and calibration AmmoLyt
® Plus
700 IQ
4 - 10 ba75651e03 08/2009
Preparations and
instructions on how to
keep the basic
conditions
z
Select a place where clean working conditions and a constant,
sufficiently high temperature are granted (a room, e.g. laboratory).
Temperatures under 10 °C extend the conditioning time
considerably.
z
Make sure the temperature of all components (sensor, standard
solutions, containers, accessories etc.) is similar and constant. We
recommend to store the standard solutions in the same place where
the check or calibration is carried out.
z
Use containers and accessories (beaker, stirring rod) that are
absolutely clean and without detergent residues. Detergent residues
can seriously affect the function of the electrodes.
z
Remove the protective hood and clean the sensor thoroughly.
Before the check, rinse the sensor with standard solution VARiON
®
/
ES-2.
z
Make sure the depth of immersion is sufficient (minimum 5 cm).
z
Make sure there are no air bubbles in front of the electrode
membrane.
z
Conditioning times: During the conditioning steps, all relevant
combination electrode voltages are indicated on the display. Thus
you can observe the conditioning process.
z
Regular stirring accelerates the conditioning process considerably.
Stirring with a stirring rod or the sensor itself is sufficient.
z
For calibration, the standard solution is discarded after conditioning.
This is pointed out by a corresponding note in the calibration routine.
It is essential for an exact calibration result.
z
Use the Online help if you are unsure of anything during calibration.
4.3.2 Result of the check
Evaluation At the end of the check, the result for the combination electrodes is
shown on the display with "+" (successful) or "-" (unsuccessful). The
exact check criteria are given in the
Online help of the result display. At
the same time the result is entered in the log book as an info message.
There is no entry in the calibration history.