YSI IQ S ENSOR N ET NitraVis 70x IQ - Manual (Page 23)

NitraVis 70x IQ
Measuring / Operation
4 - 3 ba75950e02 11/2012
4.3 Calibration
4.3.1 Overview
In the delivery condition, the sensor is precalibrated and ready to mea-
sure (see section 3.4.1).
There are two types of calibration that are included into the calculation
of the measured value at different points (see section 4.1):

User calibration (see section 4.3.2)
 Sensor check/ Zero adjustment (see section 4.3.3).
An overview diagram of the calibration procedures can be found on
page 4 - 9.
User calibration With a user calibration you compensate for the influence of the test
sample. The user calibration requires a successful Sensor check (H2O
dest.) and a valid Zero adjustment .
We recommend to check the current user calibration against indepen-
dent comparison measurements if you suspect a basic change of the
characteristics of the test sample. If the comparison measurements
show clear deviations, these can be compensated by a user calibration.
Recalibration after
changing the measuring
location
The data of the user calibration are stored in the IQ S
ENSOR
N
ET
con-
troller and thus assigned to the measuring location (not to the sensor).
The calibration data of the Zero adjustment are stored in the sensor.
Each time after the application or measurement location
(and the setting, Measuring location ) was changed, we
recommend to carry out a Sensor check (H2O dest.)
(and, if the Sensor check (H2O dest.) was not successful,
an additional Zero adjustment if necessary) with a subse-
quent user calibration.