YSI IQ S ENSOR N ET NitraVis 70x IQ - Manual (Page 28)

Measuring / Operation
NitraVis 70x IQ
4 - 8 ba75950e02 11/2012
4.3.3 Sensor check/ Zero adjustment
Note
The sensor check or Zero adjustment must be carried out under abso-
lutely clean conditions. If you do not work carefully enough the Zero ad-
justment can deteriorate the measuring quality.
Ultrapure water
(H2O dist.)
As ultrapure water exclusively use distilled or deionized water that is
suitable for analysis purposes. Especially make sure that the concen-
tration of metrologically relevant substances (nitrate) is negligible.
Storage location of the
Zero adjustment data
The data of the sensor checks are not stored.
The data of the user zero adjustment are stored in the sensor.
Steps A successful Sensor check (H2O dest.) is the prerequisite for a valid
user calibration. After each Sensor check (H2O dest.) the sensor is
evaluated.
A changed sensor evaluation proves that the cleaning was effective.
The steps of the sensor check or Zero adjustment are identical except
for the used check solutions (ultrapure water or standard solution) and
are described together below. The sensor check and Zero adjustment
are carried out with the aid of the sensor sleeve.