Xylem IQ SensorNet FDO 70x IQ (SW) - Manual (Page 19)

FDO
®
70x IQ (SW) Measuring / Operation
4 - 1 ba76014e01 02/2012
4 Measuring / Operation
4.1 Measuring
WARNING
Contact with the sample can be dangerous for the user!
Depending on the type of sample, suitable protective measures
must be taken (protective clothing, protective goggles, etc.).
Note the data given in section 7.2 A PPLICATION CONDITIONS , especially
the minimum immersion depth of the sensor (> 50 mm). The measured
value is available immediately on submersing.
Note
If keeping the sensor clean is a problem, we recommend using the
compressed air-driven cleaning system with the CH cleaning head (see
section 5.5 R
EPLACEMENT PARTS AND ACCESSORIES ).
4.2 Function check and user calibration
4.2.1 General information
Factory calibration The FDO
®
70x IQ (SW) is factory calibrated. In the recommended
application (see section 1.3 R ECOMMENDED FIELDS OF APPLICATION ), the
measuring characteristics of the sensor cap remain stable for the spec-
ified service life. Thus, a user calibration is not usually required.
When does a function
check or user calibration
make sense?
A function check or user calibration can be useful in the following spe-
cial 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.
Check or calibration
medium
Select one of the following two variants depending on the air tempera-
ture at the calibration site:
 With air temperatures over 5 °C, the function check and user calibra-
tion ideally take place in water vapor-saturated air. To do so, posi-
tion the sensor approx. 2 cm above a water surface, for example in
a narrow bucket or similar container with water. The membrane
must be clean and dry for this.