YSI IQ S ENSOR N ET TriOxmatic 700 IQ (SW) - Manual (Page 17)

TriOxmatic
®
700 IQ (SW) Measuring / Operation
4 - 1 ba76013e01 01/2012
4 Measuring / Operation
4.1 Measuring
Warning
Contact with the sample can lead to danger to the user!
Depending on the type of sample, suitable protective measures
must be taken (protective clothing, protective goggles, etc.).
For measuring submerse the operable sensor in the test sample. The
measured value is available immediately on submersing.
4.2 Calibration
4.2.1 General information on calibration
Why calibrate? During the operation of a D.O. sensor, the slope of the D.O. sensor
changes with time. The calibration procedure determines the current
slope of the sensor.
When to calibrate? Calibrate before measuring and at regular intervals (depending on the
application).
Calibration procedure Ideally, calibration takes place in water vapor-saturated air. To do so,
position the sensor approx. 2 cm above a water surface, for example in
a narrow bucket or similar container with water.
In the case of air temperatures under 5 °C we recommend to calibrate
not in air but in air-saturated water that has a higher temperature. You
obtain air-saturated water by pouring water several times in and out of
two vessels so that it sparkles.
Note
For calibration the membrane always has to be clean, for calibration in
air it has to be dry. Clean contaminated sensors before calibration (see
section 5.2 C
LEANING THE SENSOR SHAFT AND MEMBRANE ).
Calibration record /
calibration history
The result of a calibration is stored in the calibration record and
calibration history respectively and can be viewed afterwards (see
respective IQ S
ENSOR N ET system operating manual).
Maintenance condition During calibration the sensor is in the so-called maintenance condition.
This means all linked outputs retain their momentary state. After
finishing calibration the maintenance condition has to be switched off
manually. For more detailed information on the maintenance condition
please refer to the respective IQ S
ENSOR N ET system operating
manual.