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6.2 Calibration
In case of calibration, performance of a sensor is changed. Necessary correction
values will be stored in a non-volatile memory on the sensor to take drifts into
the account.
The temperature dependency of the salt standards as well as the temperature
gradient will be compensated automatically.
Within scope of supply, there are 6 ready to use and reusable salt standards plus
an empty standard cup to be filled with pure water if the point 1.0000aw needs
to be calibrated as well.
However, best practice is to use 2 or 3 salt standards t
o perform a bracket calib
-
ration, means at least one value lower and one higher than the normal measure-
ment range of the samples:
Are calibration point 1 and point 2 more than 0.40aw apart, it is recommended
to use a third calibration point in between.
6.2.1 Performing a calibration
• Ta
ke the respective salt standard and place it on the RFID reader in the
measurement chamber (indicated with RFID symbol) until you hear a short
beep, then move the standard to the measurement position and close the
measurement chamber.
•
A pop-up window as below is displayed:
It contains info about the used salt standards as theoretical value at 25°C,
serial number, last usage and number of use.
•
Please select „CALIBRATE“ to start calibration process. If you have not closed
the measurement chamber yet, a respective message appears.
•
If sensor is password protected, you will be prompted to enter it now.
•
Then calibration is started and performed automatically. It can take between
16 to 120 mins. During this process, „Calibrate“ is displayed in the start/stop
button. To abort the process at any time, simply press start/stop button.
•
Once finished, stable beep is issued as an accoustic signal and a window con-
taining a calibratiuon successful or calibration failed note is displayed.
•
As long as the measurement chamber is not opened, you can retrigger cali-
bration as often as required. To do so, go to „Chamber Settings“ -> „Sensor
calibration“ -> „Retrigger sensor calibration“