YSI IQ SensorNet FDO Sensor - Manual (Page 19)

FDO
®
70x IQ ... Measuring / Operation
ba76014e03 05/2014 4 - 1
4 Measuring / Operation
4.1 Measuring
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.
4.2 Function check and user calibration
4.2.1 General information
Factory calibration The FDO
®
70x IQ ... is factory calibrated. In the recommended applica-
tion (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.
WARNING
Chemical or biological hazard.
Contact with the sample can be harmful to the user.
Depending on the type of sample, suitable protective
measures must be taken (protective clothing, gog-
gles, etc.).
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 ).