Xylem HandyLab 680 - Manual (Page 73)

HandyLab 680 Operation
73 ba77041e01 03/2014
4.9.5 D.O. calibration
Why calibrate? D.O. sensors age. This changes the slope of the D.O. sensor. Calibra-
tion determines the current slope of the sensor and stores this value in
the instrument.
Note
The
FDO ®
1100 IDS D.O. sensor ages so little it does not have to be
regularly calibrated.
To detect changes of the sensor as early as possible, the FDO
®
Check
procedure can be useful (see section 4.9.4).
When to calibrate?  If your evaluation of the FDO ®
Check procedure suggests a calibra-
tion
 When the calibration interval has expired
 If your accuracy requirements are especially high
 Routinely within the scope of company quality assurance measures.
Calibration procedures Calibration in water vapor-saturated air.
To calibrate the
FDO ®
1100 IDS sensor, use the check and storage
vessel.
Stability control
(AutoRead)
In calibration, the Stability control function (AutoRead) is automatically
activated.
Display calibration data
and output to interface
You can have the data of the last calibration displayed (see section
4.10.6). Subsequently, you can transmit the displayed calibration data
to the interface, e. g. to a PC, with the <PRT> key.
Note
The calibration record is automatically transmitted to the interface after
calibrating.
Sample record
Calibration evaluation After the calibration, the meter automatically evaluates the current sta-
tus of the calibration. The evaluation appears on the display and in the
calibration record.
HandyLab 680
Ser. no. 10139695
CALIBRATION Ox
Calibration date
15.03.2014 16:13:33
FDO 1100 IDS
Ser. no. 10146858
OX 930 10158765
Relative slope 0.98
Sensor +++