KROHNE OPTISENS AAS 2000 EN - Manual (Page 26)

5
OPERATION
26
OPTISENS AAS 2000
www.krohne.com 12/2008 • MA AAS 2000 R01 en
Performing an air calibration
• Fill a bucket halfway with water.
• Place the sensor about 30...45 cm/1...1.5 ft above the water surface to create a humid
environment.
• Cover the bucket with a towel.
• Select the sensor to be calibrated in the menu by using ↑ or ↓.
• Press ^ for approximately five seconds to enter the sensor menu.
• Select Calibrate > Airpres.mB Calibrate > Airpres.mB Calibrate > Airpres.mB Calibrate > Airpres.mB and press ^.
• Enter the current air pressure in mbar using ↑ or ↓ to change a digit and ^ to move on to the
next digit. It is sufficient to specify the pressure within 10 mbar (see table below for
conversion from inHg to mbar).
• Select Calibrate > Calibrate Calibrate > Calibrate Calibrate > Calibrate Calibrate > Calibrate and press Press ^.
• Select Air Air Air Air using ↑ or ↓ (three choices can be made, "Air"/"No"/"Zero").
• Press ^.
• Wait for the sensor to be calibrated. A successful calibration will take anywhere between 5...15
minutes for the sensor to stabilize.
i A dialog box saying "Calibration done" will come up after successful calibration.
• Press ^ to return to the previous menu.
• Select Calibrate > Calibrated Calibrate > Calibrated Calibrate > Calibrated Calibrate > Calibrated and press Press ^.
• Enter the date of the air calibration using ↑ or ↓ to change a digit and ^ to move on to the next
digit.
• Press ^ to return to the previous menu.
i The sensor is air calibrated.
The following appear in the calibration menu as read-only:
• Temp (info) Temp (info) Temp (info) Temp (info): Displays the current temperature of the sensor.
• Test (info) Test (info) Test (info) Test (info): Displays the current measured dissolved oxygen value. Immediately after
calibration and before the sensor is placed in the liquid, this value should closely resemble
Setvalue. A reading outside of an acceptable range may indicate that the electrode needs to
be replaced.
• Setvalue Setvalue Setvalue Setvalue: Ideal value calculated using temperature and air pressure.
.book Page 26 Monday, December 15, 2008 12:43 PM