Xylem wtw MIQ/IDS, Operating Manual, Page: 28 / 62

Dissolved oxygen MIQ/IDS
28
ba77277d01 01/2024
6.2 Check and calibration
6.2.1 General information
Factory calibration
The FDO
®
925 is factory calibrated. The measuring characteristics of the sensor
cap remain stable for the specified service life. Thus, calibration is usually not
required.
When does a check
or calibration make
sense?
A check or calibration can be useful in the following special cases:

If the measured values appear to be implausible and it is assumed that the
service life of the sensor cap is over

Routinely within the framework of the company quality assurance
Principle
A check/calibration is carried out in water vapor-saturated air (test and storage
vessel
FDO
®
Check).
With the calibration procedure, the relative slope of the sensor is determined.
The calibration is evaluated based on the relative slope and the intensity
(successful <-> unsuccessful).
6.2.2 Function check
Procedure
Generally, a check on the IQ S
ENSOR
N
ET
is carried out as follows. For system
specific details, please refer to the IQ S
ENSOR
N
ET
system operating manual.
The check/calibration can be carried out on the following devices:

On the
IQ S
ENSOR
N
ET
(see section 6.2.2
F
UNCTION CHECK
,
and section 6.2.3
C
ALIBRATION
)

on an IDS meter
(see operating manual of the meter)
Details of the check or calibration may vary depending on the device
selected.
Prepare the check and storage vessel FDO
®
Check
.
The sponge in the
FDO
®
Check
check and storage vessel must be
moist (not wet).